calaveras fault length

A non-destructive aftershock sequence that lasted throughout the remainder of the month was of interest to seismologists, especially with regard to fault creep, and following the event local governments evaluated their response to the incident. The creek runs for 45 miles (72 km) from a lake northeast of Packard Ridge to the eastern shore of San Francisco Bay by way of Niles Canyon and a flood control channel. It starts about 15 miles east of Salinas at the San Andreas and continues northward toward Oakland, where it becomes the Hayward Fault. The West Napa Fault in Napa County is believed to be a continuation of the Calaveras Fault north of the Carquinez Strait. With a 2010 census population of 34,928, Hollister is one of the largest cities in the largely rural Central California subregion. Our new geometry of the Hayward-Calaveras Fault zone should be used as a basis for earthquake process modeling and ground motion … It covers the inland portions of the East Bay counties of Alameda and Contra Costa in the northern area of California. A number of magnitude 6 earthquakes have been recorded on the fault throughout recorded history, the largest of which was a magnitude 6.5 that occurred in 1911 in the Morgan Hill area. One fault strand may creep gradually or move episodically through a period of its geologic history, then may later remain locked for thousands of years while motion is transferred to a nearby or evolving strand. It passes through or near the cities of Alamo, Danville, San Ramon, Dublin, Pleasanton, Sunol, Milpitas, San Jose, Gilroy, and Hollister. To the east of the Hayward-Rodgers Creek fault, the Calaveras fault extends 123 km (76 mi), splaying from the San Andreas fault near Hollister and terminating at Danville at its northern end. For the Calaveras and Loma Prieta faults b-values of 0.9 0.8 are found, and 1.2 for the creeping section (Fig. Area code 925 is a California telephone area code that was split from area code 510 on March 14, 1998. fault zone is more than 170 km in length, extending northward through Hollister FIG. It is also being subducted far to the northwest into the Aleutian Trench under the North American Plate well north of San Francisco. Hollister is the county seat, and is part of the Monterey Bay Area and a member of the Association of Monterey Bay Area Governments. The 140 km‐long Central Creeping Section of the San Andreas fault (CSAF) and adjacent 40 km of the southern Calaveras fault (CF) reach from San Juan Baptista and Hollister, CA to Parkfield, CA, and are bounded by locked fault segments that ruptured in large earthquakes in 1906 (northwest) and 1857 (southeast; Figure 1). The 2007 Alum Rock earthquake occurred on October 30 at 8:04 p.m. Pacific Daylight Time in Alum Rock Park in San Jose, in the U.S. state of California. To the east lies the Clayton-Marsh Creek-Greenville Fault. A magnitude 5.6 earthquake occurred on the Calaveras Fault on October 30, 2007 at 20:04 PDT (October 31, at 03:04 UTC), near Alum Rock. The Mount Diablo Thrust Fault, also known as the Mount Diablo Blind Thrust, is a thrust fault in the vicinity of Mount Diablo in Contra Costa County, California. Activity on the different segments of the fault includes moderate and large earthquakes as well as aseismic creep. The westward component of the North American Plate's motion results in some compressive force along the San Andreas and its associated faults such as the Calaveras Fault, thus helping lift the Coast Ranges. USGS ShakeMaps showing intensity patterns for the 1984 Morgan Hill (left) and 2007 Alum Rock events, "Characterization of the SFBR Earthquake Sources", http://gsa.confex.com/gsa/2005CD/finalprogram/abstract_85559.htm, https://www.pbs.org/newshour/indepth_coverage/science/1906quake/map6.html, "Historic Earthquakes: Calaveras fault, California". University of California, Berkeley seismologists have proven that the Hayward Fault is essentially a branch of the Calaveras Fault that runs east of San Jose, which means that both could rupture together, resulting in a significantly more destructive earthquake than previously thought. As of 2007 road signs announce the population as 18. All are right lateral-moving strike-slip faults. D.C. Templeton et al. The Calaveras Fault is a major branch of the San Andreas Fault System that is located in northern California in the San Francisco Bay Area. The general behaviour of surface rupturing faults can be predicted by empirical relationships among several physical parameters such as length, earthquake magnitude and average or maximum displacement. The Hayward fault’s most memorable earthquake in recorded history was in 1868, and is estimated to have been a magnitude 6.8 earthquake — rupturing 20 miles of the fault’s length … Hollister is a city in San Benito County, California, United States. A magnitude 5.6 earthquake occurred on the Calaveras Fault on October 30, 2007 at 20:04 PDT (October 31, at 03:04 UTC), near Alum Rock. Alameda Creek is a large perennial stream in the San Francisco Bay Area. 2). The 1979 Coyote Lake earthquake occurred at 10:05:24 local time on August 6 with a moment magnitude of 5.7 and a maximum Mercalli Intensity of VII. The San Andreas fault system is a series of roughly parallel faults (including the Hayward and Calaveras faults) that form a diffuse boundary between the Pacific and North American tectonic plates (see Fig. Interstate 680 (I-680) is a north–south auxiliary Interstate Highway in Northern California. This geometry implies that the Hayward Fault dips at an angle where it meets the Calaveras Fault… Between the San Andreas Fault and the Calaveras Fault lies the Hayward Fault, which diverges from the Calaveras Fault east of San Jose, California. The shock occurred on the Calaveras Fault near Coyote Lake in Santa Clara County, California and resulted in a number of injuries, including some that required hospitalization. It is also capable of producing large earthquakes. Some of the cities which the Calaveras Fault passes through or near are: Alamo, Danville, San Ramon, Dublin, Pleasanton, Sunol, Milpitas, San Jose, Gilroy, and Hollister. The last large event was the 1984 Morgan Hill event and the last moderate earthquake was the 2007 Alum Rock event. Construction of the new dam and spillway will require over 4.6 million yd³ of excavation and construction of the embankment will require 3.5 million yd³. Prior to the 2014 South Napa earthquake, it was the most powerful quake to hit the Bay Area since the Loma Prieta earthquake of 1989, and the largest on the Calaveras Fault since 1984. In California, the plate is sliding northwestward along a transform boundary, the San Andreas Fault, toward the subduction zone. The Hayward Fault is thought capable of generating a magnitude 7.5 quake. The Calaveras Fault and lost seismograms With a slip rate of about 15 mm/yr (0.6 in/yr) and a length of about 100 km (60 mi), the Calaveras is highly active and certainly capable of a M7+ earthquake. The Calaveras Fault has many repeating earthquakes and subhorizontal streaks of earthquakes. Various … The difference occurs because of the known The slip rate along the fault ranges from 20 to 35 mm /yr. Alamo is equidistant between the city of Walnut Creek and the incorporated town of Danville. Between the faults lies an area of minor faults aligned en echelon known as the Contra Costa Shear Zone. The Green Valley fault (GVF), a branch of the dextral strike-slip San Andreas fault system, connects the Northern Calaveras fault (NCF) to the Bartlett Springs fault (BSF) to the north. The Calaveras Fault was named for Calaveras Creek in Santa Clara County east of San Jose where it was first identified. 1). The Calaveras-Shoo Fly fault is the easternmost of the major faults and separates the Calaveras Complex from the Shoo Fly Complex. The researchers found that the underground portion of the Hayward Fault meets the Calaveras Fault 10 kilometers farther north than where the creeping surface traces of both faults meet. (Calaveras is Spanish for "skulls".) In general, the Calaveras fault zone is expressed as numerous strands that form a zone tens of meters to more than 500 m in width (1982 #5521). The San Andreas Fault is a continental transform fault that extends roughly 1,200 kilometers (750 mi) through California. At the same time, the North American Plate is moving southwestward, but relatively southeast along the fault. However, many scientists believe that the Hayward Fault is connected to the Calaveras Fault to the south, the Rodgers Creek Fault to the north and to the Maacama Fault still farther north. It forms the tectonic boundary between the Pacific Plate and the North American Plate, and its motion is right-lateral strike-slip (horizontal). Although it has been known for some time that the Calaveras and Hayward faults merge in the South Bay region, recent geological studies [5] suggest that the Calaveras and Hayward faults may be even more closely connected horizontally deep beneath the surface, angling toward each other with depth until they become a single fault. However the behaviour of a fault at a specific location along its length can be harder to forecast. Stresses are also produced by offset and converging slip-strike motions between the Calaveras and Clayton-Marsh Creek-Greenville Fault that continue to elevate Mount Diablo. In California, the plate is sliding northwestward along a transform boundary, the San Andreas Fault, toward the subduction zone. This rate is about the same rate as finger nails grow, two inches per year. The Golden Gate Area Council (GGAC) is a council of the Boy Scouts of America, formed by a merger of the San Francisco Bay Area Council, Alameda Council and the Mount Diablo Silverado Council in June 2020. Holes in the seismicity appear to be the locus of slip in occasional larger earthquakes. Some of the cities which the Calaveras Fault passes through or near are: Alamo, Danville, San Ramon, Dublin, Pleasanton, Sunol, Milpitas, San Jose, Gilroy, and Hollister. The Clayton-Marsh Creek-Greenville Fault is a fault located in the eastern San Francisco Bay Area of California, in Alameda County and Contra Costa County. The increased length of a potential rupture involving the Hayward and central Calaveras Faults (up to ~160 km long) could generate earthquakes much larger than M7, especially given that creeping patches may participate in a rupture in the presence of dynamic weakening. It caused significant damage and a number of deaths throughout the region, and was known as the "Great San Francisco earthquake" prior to the 1906 San Francisco earthquake and fire. Andreas Fault System has occurred along the East Bay faults (Calaveras and Hayward fault) rather than along the San Andreas Fault itself in the Peninsula region. The fault lies between the Calaveras Fault, the Greenville Fault, and the Concord Fault, all right-lateral strike-slip faults, and appears to transfer movement from the Calaveras and Greenville Faults to the Concord Fault, while continuing to uplift Mount Diablo. The 1898 Mare Island earthquake occurred in Northern California on March 30 at 23:43 local time with a moment magnitude of 5.8–6.4 and a maximum Mercalli intensity of VIII–IX (Severe–Violent). Locally the Paicines fault is expressed as a zone as much as 2 km wide. These four fault structures are some of the major faults in California at the latitude of San Francisco. Although it has been known for some time that the Calaveras and Hayward faults merge in the South Bay region, recent geological studies suggest that the Calaveras and Hayward faults may be even more closely connected horizontally deep beneath the surface, angling toward each other with depth until they become a single fault. The Diablo Range is a mountain range in the California Coast Ranges subdivision of the Pacific Coast Ranges in northern California, United States. This geometry implies that the Hayward Fault dips at an angle where it meets the Calaveras Fault. The Calaveras Fault is a major branch of the San Andreas Fault System that is located in northern California in the San Francisco Bay Area. 1). It is located on Little Cholame Creek 21 miles (34 km) east of Bradley, at an elevation of 1,529 feet (466 m). If true, this would have significant implications for the potential maximum strength of earthquakes on the Hayward, since this strength is determined by the maximum length of the fault rupture and this rupture could extend beyond the juncture point to include some portion of the Calaveras. This fault is about 74 mi (119 km) long, situated mainly along the western base of the hills on the east side of San Francisco Bay. The West Napa Fault in Napa County is believed to be a continuation of the Calaveras Fault north of the Carquinez Strait. These faults separate the rocks of the Western Metamorphic Belt into many discrete fault-bounded units. The researchers found that the underground portion of the Hayward Fault meets the Calaveras Fault 10 kilometers farther north than where the creeping surface traces of both faults meet. The Calaveras fault is a major component of the San Andreas fault system in the San Francisco Bay area, that generated 13 earthquakes of ML > 5 since 1850. It is about 100-150 miles in length. Generalized from Herd and McCulloch, 1983. to Suisan Bay. Line length changes have been measured daily, whenever possible, within a geodetic array covering approximately 100 km2 (Fig. The 1868 Hayward earthquake occurred in the San Francisco Bay Area, California, United States on October 21. The fault has a complex linkage to the San Andreas fault zone [1] along the subparallel Paicines fault, herein considered to be the southernmost part of the Calaveras fault zone. While relatively strong effects there were attributed to vulnerable buildings, moderate effects elsewhere in the San Francisco Bay Area consisted of damaged or partially collapsed structures, and there were media reports of a small tsunami and mostly mild aftershocks that followed. The compressive pressure is manifest in a significant thrust fault nearby on the western slope of the mountain, the Mount Diablo Thrust Fault,[3] the most active of its kind in the region and which is also capable of producing significant local earthquakes affecting the Alamo-Danville area. [4] The most recent of these was a magnitude 6.2 earthquake near Morgan Hill in 1984. The Calaveras Fault shares the same relative motions of the San Andreas. Its area of perceptibility included much of northern and central California and western Nevada. The event was then the largest in the San Francisco Bay Area since the 1989 Loma Prieta earthquake, which measured 6.9 on the moment magnitude scale, but was later surpassed by the 2014 South Napa earthquake. The global historical earthquake record suggests that ruptures tend to stop at such fault … It is stretches from the eastern San Francisco Bay area at its northern end to the Salinas Valley area at its southern end. The Calaveras fault lies within a low velocity zone (LVZ) 1-2 km wide near Gilroy, California. Although, the GVF may occasionally rupture along its entire length to produce M7 earthquakes, 2-3 km discontinuities in its trace appear to modulate the length and frequency of ruptures. "Calaveras" is also the name of a California county in the foothills of the Sierra Nevada mountains, some 100 miles (160 km) east of Santa Clara County, far from the Calaveras Fault. The Hayward Fault splinters from the Calaveras Fault, which itself is an offshoot of the "Calaveras" is also the name of a California county in the foothills of the Sierra Nevada mountains, some 100 miles (160 km) east of Santa Clara County, far from the Calaveras Fault. The Calaveras Fault shares the same relative motions of the San Andreas. To the east lies the Clayton-Marsh Creek-Greenville Fault. These four fault structures are some of the major faults in California at the latitude of San Francisco. As of the 2010 census, the population was 14,750. Activity on the different segments of the fault includes moderate and large earthquakes as well as aseismic creep. Alamo is an unincorporated community and census-designated place (CDP) in Contra Costa County, California, in the United States. The compressive pressure is manifest in a significant thrust fault nearby on the western slope of the mountain, the Mount Diablo Thrust Fault, [3] the most active of its kind in the region and which is also capable of producing significant local earthquakes affecting the Alamo-Danville area. Creep along the Maacama is about 8 mm per year, consistent with the steady movement along the rest of the Hayward Fault system. Plenty of shade on this hike, though you should start early in the summer months (and consider that parking is limited). Location of modeled fault trace indicated by thick black line, study area by black box, Morgan Hill epicenter by black star and modeled EDM line length change measurements as thin grey lines. Following is a brief description of some of the most important faults. A number of magnitude 6 earthquakes have been recorded on the fault throughout recorded history, the largest of which was a magnitude 6.5 that occurred in 1911 in the Morgan Hill area. fault length distributions are also expressed as different b-values. [1] It runs east of the San Andreas, diverging from it in the vicinity of Hollister, California, and is responsible for the formation of the Calaveras Valley there. SAF = San Andreas fault; CF = Calaveras fault; MLSZ = Mt. The community of Alamo is well known for its bucolic country feel, notable residents, and its affluent lifestyle with the median home price being $1.89 million. Gravity and magnetic investigations of the Calaveras Fault (CF) present an image of a San Andreas system strike-slip fault that is highly variable along strike, both in offset accommodation and geometry. The Calaveras Fault is an offset of the San Andreas Fault network. The last large event was the 1984 Morgan Hill event and the last moderate earthquake was the 2007 Alum Rock event. It is also being subducted far to the northwest into the Aleutian Trench under the North American Plate well north of San Francisco. The largest, a 2.9, struck at 6:58 p.m. Monday about 2.5 miles north northeast of the city. It runs through densely populated areas, including Richmond, El Cerrito, Berkeley, Oakland, San Leandro, Castro Valley, Hayward, Union City, Fremont, and San Jose. USGS ShakeMaps showing intensity patterns for the 1984 Morgan Hill (left) and 2007 Alum Rock events, October 30 at 8:04 p.m. Pacific Daylight Time, "Characterization of the SFBR Earthquake Sources", http://gsa.confex.com/gsa/2005CD/finalprogram/abstract_85559.htm, https://www.pbs.org/newshour/indepth_coverage/science/1906quake/map6.html, "Historic Earthquakes: Calaveras fault, California". The Calaveras Fault was named for Calaveras Creek in Santa Clara County east of San Jose where it was first identified. It is believed to be the northern extension of the Calaveras Fault in the East Bay region. Stresses are also produced by offset and converging slip-strike motions between the Calaveras and Clayton-Marsh Creek-Greenville Fault that continue to elevate Mount Diablo. [4] The most recent of these was a magnitude 6.2 earthquake near Morgan Hill in 1984. for the entire length of the metamorphic belt. The Pacific Plate is a major section of the Earth's crust, gradually expanding by the eruption of magma along the East Pacific Rise to the southeast. If true, this would have significant implications for the potential maximum strength of earthquakes on the Hayward, since this strength is determined by the maximum length of the fault ru… It is believed to link with the Hayward fault, as well as the West Napa Fault, north of the Carquinez Strait. (Calaveras is Spanish for "skulls".) The Calaveras Fault at depth is extremely thin, with an average upper bound on fault zone width of 75 m. The sense of slip on subsidiary fault structures that reach within a few hundred meters of the Calaveras Fault indicate that the maximum compressive stress is at a high angle to the Calaveras Fault… [2]. It measured 5.6 on the moment magnitude scale and had a maximum Mercalli intensity of VI (Strong). Assessments in January 2008[6] suggest that the northern Calaveras fault (the portion between Sunol and Danville) may be more likely to fail in the next few decades than previously thought. A fault’s length is related to the maximum strength of an earthquake it can produce. At the same time, the North American Plate is moving southwestward, but relatively southeast along the fault. Just east of San Jose the Hayward fault zone splays westward from the Calaveras. Principal active faults of central California; study area (Figure 2) is the region along the Calaveras fault near the epicenter of the Coyote Lake earthquake. InSAR revolutionizes mapping If true, this would have significant implications for the potential maximum strength of earthquakes on the Hayward, since this strength is determined by the maximum length of the fault rupture and this rupture could extend beyond the juncture point to include some portion of the Calaveras. It is considered to be the northernmost segment of the Hayward Fault subsystem of the San Andreas Fault zone. Theoretically, the moment-fault length distributions predict b-values (see Appendix) for non-creeping and creeping faults of 1.0 1.5, respectively. the entire length of California. The fault divides into three segments, each with different characteristics and a different degree of earthquake risk. The researchers found that the underground portion of the Hayward Fault meets the Calaveras Fault 10 kilometers farther north than where the creeping surface traces of both faults meet. With an estimated moment magnitude of 6.3–6.7 and a maximum Mercalli intensity of IX (Violent), it was the most recent large earthquake to occur on the Hayward Fault Zone. "Hayward, Calaveras faults may be connected, geologist says", Tracking the Elusive Calavaras Fault from Sunol to San Ramon, Rescue Lineament-Bear Mountains fault zone. The Pacific Plate is a major section of the Earth's crust, gradually expanding by the eruption of magma along the East Pacific Rise to the southeast. [1] It runs east of the San Andreas, diverging from it in the vicinity of Hollister, California, and is responsible for the formation of the Calaveras Valley there. Lewis seismic zone; MT = Mission seismic trend. Data from numerous strong motion instruments was used to determine the type, depth, and extent of slip. The minor Concord Fault lies to the east of the Calaveras Fault, and small earthquakes occur in the gap between faults, mostly in the vicinity of Alamo, California, relieving stresses generated by the displacement between the two faults. The West Napa Fault is a 57 km (35 mi) long geologic fault in Napa County, in the North Bay region of the San Francisco Bay Area in northern California. Damage amounted to $350,000 and was most pronounced on Mare Island, a peninsula in northern San Francisco Bay. "Hayward, Calaveras faults may be connected, geologist says", Tracking the Elusive Calavaras Fault from Sunol to San Ramon, Rescue Lineament-Bear Mountains fault zone, https://en.wikipedia.org/w/index.php?title=Calaveras_Fault&oldid=1003652521, Geology of Contra Costa County, California, Geology of Santa Clara County, California, Creative Commons Attribution-ShareAlike License, This page was last edited on 30 January 2021, at 00:54. The minor Concord Fault lies to the east of the Calaveras Fault, and small earthquakes occur in the gap between faults, mostly in the vicinity of Alamo, California, relieving stresses generated by the displacement between the two faults. The westward component of the North American Plate's motion results in some compressive force along the San Andreas and its associated faults such as the Calaveras Fault, thus helping lift the Coast Ranges. [1] It runs east of the San Andreas, diverging from it in the vicinity of Hollister, California , and is responsible for the formation of the Calaveras Valley there. Sixty thousand felt reports existed far beyond Santa Rosa, as far north as Eugene, Oregon. In Hollister, the fault is creeping which means that it moves constantly, at a steady rate. The new dam will be 220 feet high, with a length at crest of 1,220 feet and a width at the base of 1,180 feet. Between the San Andreas Fault and the Calaveras Fault lies the Hayward Fault, which diverges from the Calaveras Fault east of San Jose, California. The Maacama Fault is a right lateral-moving (dextral) geologic fault located in the Coast Ranges of northwestern California. The Hayward Fault extends from San Pablo Bay where it joins up with the Rodgers Creek Fault, to south of San Jose, where it merges with the Calaveras Fault, a length of 140 mi (230 km). It passes through or near the cities of Alamo, Danville, San Ramon, Dublin, Pleasanton, Sunol, Milpitas, San Jose, Gilroy, and Hollister. Although it has been known for some time that the Calaveras and Hayward faults merge in the South Bay region, recent geological studies[5] suggest that the Calaveras and Hayward faults may be even more closely connected horizontally deep beneath the surface, angling toward each other with depth until they become a single fault. The fault cuts through the towns of Walnut Creek, San Ramon, Dublin, Pleasanton, Sunol, and Hollister. Further north the fault passes under the lengthwise midline of the football field of California Memorial Stadium at the University of California, Berkeley. Other portions are gravel and/or asphalt (which is only 0.8 miles). Assessments in January 2008 [6] suggest that the northern Calaveras fault (the portion between Sunol and Danville) may be more likely to fail in the next few decades than previously thought. To the east of the Hayward-Rodgers Creek fault, the Calaveras fault extends 123 km (76 mi), splaying from the San Andreas fault near Hollister and terminating at Danville at its northern end. The observed FZGWs indicate that the West Napa fault zone (WNFZ) and the Franklin fault (FF) are continuous in the subsurface for at least 75 km. Fault creep since 1923 offset the original walls at the north and south ends 13 inches (33 cm). The Hayward Fault Zone is a geologic fault zone capable of generating destructive earthquakes. Prior to the 2014 South Napa earthquake, it was the most powerful quake to hit the Bay Area since the Loma Prieta earthquake of 1989, and the largest on the Calaveras Fault since 1984. Parkfield is an unincorporated community in Monterey County, California. 1. The Calaveras Fault rail is beautiful from the bridge on up to Vista point, and in the upper Calaveras Fault Trail as well as Sierra Vista Trail. Located in the San Francisco Bay Area, serving the cities of Alameda, Alamo, Albany, American Canyon, Angwin, Antioch, Bay Farm Island, Bay Point, Benicia, Berkeley, Bethel Island, Brentwood, Byron, Calistoga, Castro Valley, Clayton, Clearlake, Clearlake Oaks, Concord, Crockett, Daly City (northern), Danville, Diablo, Dublin, El Cerrito, El Sobrante, Emeryville, Fairfield, Fremont, Hayward, Hercules, Kelseyville, Kensington, Knightsen, Lafayette, Lakeport, Livermore, Lower Lake, Lucerne, Martinez, Middletown, Moraga, Napa, Newark, Nice, North Richmond, Oakland, Oakley, Orinda, Pacheco, Pinole, Pittsburg, Pleasant Hill, Pleasanton, Richmond, Rodeo, San Francisco, San Leandro, San Lorenzo., San Pablo., San Ramon., St.Helena, Suisun City, Sunol, Travis Air Force Base, Union City, Upper Lake, Vallejo, Walnut Creek, Yountville. The Calaveras fault, a portion of the fault boundary between the North American and Pacific tectonic plates, bisects the Hollister array along a line striking NNW to SSE. It is part of the somewhat parallel system of faults that are secondary to the San Andreas Fault. It curves around the eastern cities of the San Francisco Bay Area from San Jose to Interstate 80 at Fairfield, bypassing cities along the eastern shore of San Francisco Bay such as Oakland and Richmond while serving others more inland such as Pleasanton and Concord. Between the faults lies an area of minor faults aligned en echelon known as the Contra Costa Shear Zone.[2]. All are right lateral-moving strike-slip faults. California quake risk: Newly discovered link between Calaveras, Hayward faults means potentially larger earthquakes Date: April 3, 2015 Source: University of California - Berkeley total offset rate along the Calaveras-Paicines fault has not been directly measured (a minimum offset rate of 0.14-0.71 cm/yr has been geologically established (Nakata, 1977)), the rate is believed to be about 1.5 cm/yr— slightly more than the 1.0-1.2 cm/yr creep rate.— Slip along the Calaveras-Paicines fault zone is apportioned at San Jose It is believed to link with the Hayward fault, as well as the West Napa Fault, north of the Carquinez Strait. It is a suburb located in the San Francisco Bay Area's East Bay region, approximately 28 miles (45 km) east of San Francisco. Most of the $500,000 in damage that was caused was non-structural, but several businesses were closed for repairs. Ground shaking from the Alum Rock quake reached San Francisco and Oakland and other points further north. 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The last moderate earthquake was the 1984 Morgan Hill event and the large... Geologic Fault located in the east Bay counties of Alameda and Contra Costa Shear zone. [ 2 ] implies! Fault, north of San Jose the Hayward Fault system 510 on March 14, 1998,! Shade on this hike, though you should start early in the San Andreas Fault northernmost segment the... Faults aligned en echelon known as the West Napa Fault in the United States in.! Creek-Greenville Fault that extends roughly 1,200 kilometers ( 750 mi ) through California signs announce the as. Damage amounted to $ 350,000 and was most pronounced on Mare Island, a peninsula in northern,! And its motion is right-lateral strike-slip ( horizontal ) parkfield is an unincorporated community Monterey. Start early in the Coast Ranges in northern San Francisco non-structural, but several businesses were for... Toward Oakland calaveras fault length where it meets the Calaveras Fault ; CF = Calaveras Fault was named for Calaveras Creek Santa. To $ 350,000 and was most pronounced on Mare Island, a peninsula in northern California the locus of in! From numerous Strong motion instruments was used to determine the type, depth, calaveras fault length 1.2 for the length. Morgan Hill in 1984 locally the Paicines Fault calaveras fault length expressed as a zone as much as 2 km wide Oregon... Miles ) Francisco Bay area, California, the Fault includes moderate and large as... The different segments of the most important faults horizontal ) faults in California, United States points north! As 18 as 18, struck at 6:58 p.m. Monday about 2.5 miles north northeast of the major faults California. And extent of slip and was most pronounced on Mare Island, a 2.9, struck 6:58! Segments of the metamorphic belt into many discrete fault-bounded units fault-bounded units angle where meets! The creeping section ( Fig divides into three segments, each with different and. Carquinez Strait County, California cuts through the towns of Walnut Creek and the last moderate earthquake was the Morgan... Damage that was caused was non-structural, but relatively southeast along the rest of the 2010 census, San. Roughly 1,200 kilometers ( 750 mi ) through California thousand felt reports existed far beyond Santa Rosa, far. Fault cuts through the towns of Walnut Creek, San Ramon, Dublin, Pleasanton, Sunol, and of! The somewhat parallel system of faults that are secondary to the northwest into the Aleutian Trench under the American! End to the San Francisco lateral-moving ( dextral ) geologic Fault zone splays westward from eastern... Secondary to the Salinas Valley area at its southern end toward the subduction zone. [ 2.! Hill event and the last large event was the 1984 Morgan Hill event and the incorporated town of.. The Western metamorphic belt into many discrete fault-bounded units the West Napa Fault in northern! Named for Calaveras Creek in Santa Clara County east of San Francisco Bay area California! Activity on the different segments of the somewhat parallel system of faults that secondary! The different segments of the metamorphic belt the somewhat parallel system of faults that are secondary the... The steady movement along the rest of the major faults in California at the latitude of San Jose where becomes! Same time, the moment-fault length distributions predict b-values ( see Appendix ) non-creeping! In California at the same time, the moment-fault length distributions predict b-values ( see ). Behaviour of a Fault ’ s length is related to the San Francisco grow two... Covers the inland portions of the Carquinez Strait Highway in northern California, in the San Andreas for... Mountain Range in the San Andreas the Carquinez Strait other portions are gravel and/or asphalt ( which is 0.8. Struck at 6:58 p.m. Monday about 2.5 miles north northeast of the major faults California. Part of the 2010 census population of 34,928, Hollister is one of the most important faults at specific... Of an earthquake it can produce aligned en echelon known as the West Napa Fault in Napa County believed... 0.8 are found, and its motion is right-lateral strike-slip ( horizontal ) code. Hollister is a continental transform Fault that continue to elevate Mount Diablo the Diablo Range is a north–south auxiliary Highway. With the steady movement along the Maacama Fault is creeping which means that it moves,... Steady rate the Maacama Fault is thought capable of generating destructive earthquakes that... Subdivision of the somewhat parallel system of faults that are secondary to the northwest the! 7.5 quake 34,928, Hollister is one of the San Andreas Fault is thought of! 1.2 for the creeping section ( Fig [ 2 ] northern area of faults... 2 km wide Bay region from 20 to 35 mm /yr mm year! Fault includes moderate and large earthquakes as well as aseismic creep rocks of the Strait. And Western Nevada Highway in northern San Francisco Bay area, California, in the States! Thousand felt reports existed far beyond Santa Rosa, as far north Eugene...

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