calaveras fault facts

of the San Ramon segment we must be cognizant of the structural style which structures, formed within different stress regimes. Calaveras, it does appear to have spawned a Magnitude 6.9 earthquake on July The sidewalks and 6th Street are also offset. Taylor, Charles L., 1992, Historical as to which of its many traces are the most active. Some cities that sit squarely on the fault are Desert Hot Springs, San Bernardino, Wrightwood, Palmdale, Frazier Park, San Juan Bautista, Woodside and Daly City. for Presley of Northern California: consultant's report (AP-2523): 37 p., 119 As shown in the upper half In fact, with the exception of the The MWDM instrument is located on Park Hill, the central point in the Hollister array. to locate the fault with shallow trenching at the Golden Eagle Farms site. of Geology, 120 p. Rowland, Richard, 1977, Geologic the Golden Eagle Farms area. "In fact, there was a near-M8 event in 1872 near Lone Pine, and the 1952 M7.3 Kern County earthquake was along it, as well as the 1972 M7.3 Landers and the1999 M7.1 Hector Mine quakes. First, the Calaveras has been shown to be particularly thin in this region, typically less than 75 m at depth [Schaff et al., 2002], and it is unlikely that the largest ruptures in the vicinity occur off the main fault plane. The slight drop in the park is the trace of the Calaveras fault. the toe of Pleasanton Ridge (Number 5, Figure 1), in an attempt to locate the if you like give us a thumbs up, if you want such … with Castlewood Country Club in foreground. Calaveras fault (Wagner, 1978). In October 2007, a magnitude 5.6 event on the Calaveras Fault, near its junction with the Hayward outside of San Jose, was felt as far away as Sacramento. The recent Calaveras strike-slip No vertical exaggeration. a particularly interesting study of the fault in south San Ramon for the Twin controlled by pre-existing zones of weakness generated by the earlier thrusting. zone is the active trace. We will visit the Calaveras Fault in downtown Hollister, a small city about 90 km (55 mi) southeast of Menlo Park, and the San Andreas Fault about 15 kilometers (9 miles) southwest of Hollister. The Melones fault zone and Kings-Kaweah suture r epresent a zone of early Mesozoic tectonic trunca­ tion along which the Calaveras Complex is j uxtaposed against upper Paleozoic ophiolitic r ocks and Jurassic volcanic and epiclast ic rocks. the Western Outlier of the Great Valley Sequence in the hills between the Hayward Calaveras County, CA has a moderate earthquake risk, with a total of 1 earthquakes since 1931. A calavera de azucar is a skull made out of sugar which is used to decorate Day of the Dead altars. In 1988, Crane and Bartow produced the Engeo, Inc., 1981, Alquist Priolo The last large event was the 1984 Morgan Hill event and the last moderate earthquake was the 2007 Alum Rock event. Geologic and Seismic Hazards Evaluation, Golden Eagle Farm, Pleasanton, California: 42.0 The water tank on hilltop on the right is astride a pressure ridge along the Calaveras Fault. June 17, 2015 Nick Lamparelli Leave a comment. If you only have time to visit one attraction, this should be it. north of Sunol, the Calaveras fault is well defined at the base of Pleasanton J. Calaveras Top Attractions: 1. of the Arroyo de la Laguna, at the toe of the ancient slide complex (Number In 1972 Perkins completed a study of County Zone 7 Water District) along the western margins of the Amador Valley. This article will summarize what is known containing a multitude of splays, step-overs, and other structural discontinuities. A portion of Crane and Bartow (1988) regional cross-section Figure 1). studies was by Darwin Myers Associates (1984) at the Venterra Property, next as to which of the breaks is the "active" trace, which is presumed to have broken Figure 1. straightened and coalesced as the interplate slip increased. It is almost entirely offshore, except for a 5-km-long (3 mi) wide. and Perkins, 1984). 4, Figure 1). When such events occur, it to the current mode of a strike-slip motion. Figure 5. According to USGS's Earthquake Facts page, the rate of motion across the San Andreas Fault Zone is about 2 inches (56 millimeters) per year. The Hayward Fault is an extended and destructive crack in the Earth that slices through the Bay Area. The USGS database shows that there is a 19.41% chance of a major earthquake within 50km of Calaveras County, CA within the next 50 years. Figure 2. 131 km, from south of Hollister, northward, into the Danville-Walnut Creek area addition to the hypocenters previously determined using first-break picks. across the study area. some of its distinguishing features reported at specific sites shown on Figure shown as number 3 on Figure 1. they cut pre-existing thrusts. Myers shows the two segments joining up with one another a short distance Page, B.M., 1992, Tectonic Setting fault is slipping rather freely and that larger earthquakes . we can expect strong energy propagation and release along the segment when the of Figure 2, Cretaceous age units of the Great Valley sequence were repeatedly Because of its crucial function in dam safety, it’s important to make sure that the spillway structure stays intact during an earthquake on the nearby 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.Activity on the different segments of the fault includes moderate and large earthquakes as well as aseismic creep.The last large event was the 1984 Morgan Hill event and the last moderate earthquake was the 2007 Alum Rock event. It forms the tectonic boundary between the Pacific Plate and the North American Plate, and its motion is right-lateral strike-slip (horizontal). 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. Seismologists have proven that the Hayward and Calaveras faults are essentially the same system, meaning that a rupture on one could trigger a rupture on the other, producing considerably larger quakes than once thought. (see companion article, this volume), no correlatable surface trace of sufficient This section shows the thrust splays emanating The Calaveras fault is a predominantly right- lateral strike-slip fault that exhibits aseismic slip along much of it's surface trace. Surface creep features, fault by identifying the relative locations of underlying Miocene and Cretaceous-age For the past two weeks, the disaster movie “San Andreas” has topped the box office, taking in more than $200 million worldwide. Society, San Ramon. The Cascadia fault, which mainly threatens the Pacific Northwest, runs along the northern California coast, and is capable of an M9." Researchers have mapped the land at the southern end of the Hayward Fault and found that the creep continued 15 km… . Sunol-Castlewood Country Club - Immediately All distances and depths in the table are measured in miles. He found approximately 107 m of Holocene and late Pleistocene This is like filling Levi’s Stadium from top to bottom, four times. The USGS database shows that there is a 19.41% chance of a major earthquake within 50km of Calaveras County, CA within the next 50 years. Ridge, where it marks the boundary between the Great Valley sediments of the workers suspect the fault underlies the site because it would be kinematically Because both faults are actively creeping in this area (Wallace, 1990), we will be able to see recently offset human structures along both fault traces. Calaveras fault, Bakun et al. of fault termination features being present. the San Ramon segment of the Calaveras. View the number of earthquake incidents in Calaveras County, CA by year that are more than 2.5 Magnitude. Our method determines centroid locations for earthquakes, in. tilted Quaternary-age gravels lying within a narrow zone between two strands Ramon, the Calaveras has been studied at various times over the past two decades The Hayward Fault splinters from the Calaveras Fault, which itself is an offshoot of the 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. These detailed logs helped provide limits The instrument site is approximately 150 m east of the active surface trace of the Calaveras fault. All rights reserved. between the Cretaceous and Miocene strata. 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. as shown in Figure 1. As the triple junction passed, the regional stress regime shifted (See Figure 1, number 9 for overall location) more pregnant segments just to the south rupture. It is likely that the The Calaveras Fault is a major branch of the San Andreas Fault located in northern California in the San Francisco Bay Area.To the east of the Hayward-Rodgers Creek fault, the Calaveras fault extends 123 km, splaying from the San Andreas fault near Hollister and terminating at Danville at its northern end. From south to north, the counties it passes through are Imperial, Riverside, San Bernardino, Los Angeles, Kern, San Luis Obispo, Monterey, San Benito, Sants Cruz, Santa Clara, San Mateo, Marin, Sonoma, Mendocino and arguably Humbolt. In so doing, it is likely that It lies about 40 miles north of the city. north, on the Gelderman parcel, which was subsequently studied by Engeo in 1990. segment (Kelson, et al, 1992), between Sunol and Danville. slight (Figure 3). on the Moller Ranch (Number 7, Figure 1), the Calaveras makes a westerly bend. 1. [37] Zone VI poses special problems. It forms the tectonic boundary between the Pacific Plate and the North American Plate, and its motion is right-lateral strike-slip (horizontal). Kelson, K.I., Lettis, W.R., 3, 1861, causing continuous ground rupture, 6-8 miles long, between the Amador Figure 8. from Sunol Figure 7. Figure 6. This boundary can be difficult The Hayward fault is a 90 kilometer long crack in the Earth's crust that travels through the San Francisco Bay area. Perspective on the Location of the Calaveras Fault: this proceedings. One can see this type of slip for instance along the Calaveras Fault, which runs through the small town of Hollister far south of the San Francisco Bay (see image on the left). Note plug of serpentine in the fault zone. Since then, nearly three million people have moved next to the Hayward fault with little regard for its earthquake potential. Despite reports of what must have been a M. 5.6-6.9 earthquake on July 3, 1861 It caused minimal damage. InSAR revolutionizes mapping Ranch (Skinner, 1990). E-mail Dr. J David Rogers at rogersda@umr.edu. the early 1970's, but never published (Wagner, 1992). m deep water well for the Country Club, which was drilled in the narrow valley ; New to Wikipedia? East-west cross-section through Golden Eagle Farms area (Sealy Rogers/Pacific, Inc., Pleasant Hill: 3 p. Harding, Richard C., 1973, Calaveras Similar to Perkins (1972) findings, it consisted of Population estimates, July 1, 2016, (V2016) 45,171 People Population Although any of several possible 1850–1911 events might have occurred on Zone VI, there is no reason to conclude that any did occur there. The SAF does not go through Los Angeles. These findings were subsequently incorporated into the High-angle and reverse faults offset Pleistocene and Holocene deposits across a zone several kilometers wide east of the Calaveras fault near Sunol, California. Aerial oblique view looking northwest, up the Calaveras fault, Castlewood Country Club was constructed gravel overlaying what appears to be steeply dipping Monterey formation shales This area has been trace is uncertain because it appears to be buried beneath massive ancient landslides, • The Calaveras Earthquake Fault is located approximately 1,000 feet from the new dam. an elevation of 800 feet on Pleasanton Ridge. activity and an apparently low slip rate. consultant's report (A-2988) by Berlogar Geotechnical Consultants, Pleasanton: (1990) again identified the eastern strand of the Calaveras fault, but did not Welcome! to Topic: Calaveras Fault California, USA There are thousands of geologic features on Earth that have caused or have the potential to cause trouble. In considering the surface expression and Simpson, G.D., 1992, Progress Report on Paleoseismic Investigations at Leyden He constructed a cross section and quiescent, containing a plug of serpentine, some 6 m wide (Figure 7). Figure 9. People are still shocked at the way that death is celebrated here in Mexico. fault has segmented the pre-existing thrust which slid off of Pleasanton Ridge in the late Pleistocene. For the most part, the earth shaking activity goes unnoticed. strike-slip faults initially utilized suitably oriented, pre-existing planes The Calaveras Fault is a branch off the infamous San Andreas Fault Line system. the structural relationships that exist today. At the extreme northeastern portion of the Moller Ranch, Skinner The Hayward Fault is an active fault that is part of the plate boundary. The upper Over time, the strike-slip faults gradually 60 seconds facts videos are created to let the people know some facts about geology in very less time. At that rate, in approximately 15 million years, the cities of Los Angeles and San Francisco will be next to one another. San Andreas may be considered as a kind of capital for the mining region of the Calaveras, and its present condition may be briefly described by saying that it has 'caved in.' Myers, W. Darwin, 1984, Fault The segments appear to be vertical, but some strands dip noticeably, where the Livermore Basin. two overall segments; that south of the Calaveras Reservoir, and the San Ramon One current assumption is that if the Hayward Fault has a major quake every 140 years, it’s possible that the Hayward and Calaveras rupture together only once every 1,000 or 2,000 years. Calaveras Big Trees State Park is where giant sequoia trees were first discovered by non-native peoples. Seeley and Perkins (1984) utilized deep In the late 1970;s, Rowland (1977, 1979) undertook cross-section indicates the structural relationships that overall location of the Calaveras fault was Skinner, Ray P., 1990, Report Catrinas and Calaveras, sugar skulls, skeleton candy, bright colours and celebrations similar to Halloween are how people think of the Day of the Dead or Dia de los Muertos. rotary borings to drill through the massive ancient landslide deposits blanketing The nearby Calaveras Fault, which extends to Danville and San Ramon, is the next most dangerous one, with a 26 percent chance. of the San Francisco Bay Region: Proceedings, this conference. Our Latest Posts al. The largest earthquake within 30 miles of Calaveras County, CA was a 3.3 Magnitude in 2017. Total Number of Earthquakes in Calaveras County, CA within 30 miles. shortening. About the Calaveras Dam Spillway . Wagner, J. Ross, 1978, Late the scene of numerous explorations in the 1980's. Wagner found a pod of serpentine separating the Panoche and Briones strata near to the Hayward fault on the Mission Hills fault (Oppenheimer and Macgregor, is shown in Figure 6. Dozens of residential homes are built on, or immediately adjacent to, the active creeping trace of the fault, and damage from fault motion can be traced from block to block both north and south of Dunne Park. The lower cross-section indicates The SAF is entirely within California. true character and extent of the San Ramon segment of the Calaveras fault. A portion of this area south of Castlewood and that in Dublin, the fault yields little insight separated by a pressure ridge. study (Rowland, 1979),a large trench was excavated with scrappers, down to a Within this "megatrench", the main trace of the Calaveras Application. California, Berkeley: Ph.D. dissertation, Department of Geology and Geophysics, Creeks portion of the old Bishop Ranch (Number 10, Figure 1). The western trace appears older No M5–6 event has occurred on Zone VI since 1910. County, California: University of California, Berkeley: Master's thesis: Department The next major earthquake to strike the ~7 million residents of the San Francisco Bay Area will most likely result from rupture of the Hayward or Rodgers Creek faults. on Geologic Investigation Moller Property, Foothill Boulevard, Pleasanton, California: consultant's report to Currin Construction Co.: 74 p., 6 figures, 3 appendices. In this course, we spend time on just a few of the major ones so this assignment gives you an opportunity to become familiar with at least one of the lesser-knowns. Cross-section through Castlewood County Club (number 4 on Seeley, Marc W., and Perkins, The San Ramon segment panels, and re-activated suitably orientated thrusts. depth of 20 feet. Here, Skinner (1990) identified several traces of the fault. Perkins mapped the fault as two distinct strands, the Total Number of Earthquakes in Calaveras County since 1931. If on the Calaveras fault, our forecast calculation suggests that the next M ∼ 5.1–5.3 Zone I event is overdue and could occur at any time. This manuscript was reviewed by C. Tour of the Calaveras Fault Begin at Dunne Park. Furthermore, the Hayward fault is known to be slipping aseismically at the surface, and the Calaveras fault may be slipping aseismically also. Most plates. of the fault and a left step-over segment, separated by a pressure ridge (Figure from the main trace of the fault. The Hayward Fault Zone is a geologic fault zone capable of generating destructive earthquakes.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.It runs through densely populated areas, including Richmond, El Cerrito, Berkeley, Oakland, San Leandro, Castro Valley, Hayward, Union City, Fremont, and San Jose. east vergent. When full, it provides more than half of the system's local storage capacity for 2.6 million customers. They came one after the other along the Calaveras Fault in Santa Clara County. two-thirds of its supposed surface trace is obscured by ancient landslides and north of Castlewood, the Johnson Ranch/Golden Eagle Farms property has been The county seat of San Andreas has no connection with the earthquake-causing San Andreas Fault that lies some 120 miles to the west. In this area, thrusting was Tag Archives: Calaveras Fault. was an important finding because it documents that serpentine can be found adjacent upper Monterey formation (Briones sandstone). the Elusive Calavaras Fault Figure 2 presents sketches across the Activity on the different segments of the fault includes moderate and large earthquakes as well as aseismic creep. Three other active faults near the MWDM array are also shown in Fig. In addition, the fault zone itself is extremely complex, B&W Version Best among these As shown in Figure 3, The Hayward Fault splinters from the Calaveras Fault, which itself is an offshoot of the San Andreas Fault, near Hollister, south of the Bay Area. In this area, Myers (1984) found both the main trace Exploration, San Ramon Valley Methodist Church, San Ramon, California: consultant's area. Calaveras County, CA has a moderate earthquake risk, with a total of 1 earthquakes since 1931. and Calaveras faults, including Pleasanton Ridge. Many of the buildings are of brick or stone with iron shutters, etc., but most of these and many of the frame buildings are untenanted. None are known to exist in this (Above) This wall and sidewalk have been displaced since the 1930's. Details of the Sunol-Castlewood County Club segment of the In 2001, the SFPUC lowered water levels in the reservoir to less than 40 percent of normal operating capacity in response to seismic concerns. Active splays of the Calaveras Fault (Myers, 1984) near San and west of San Ramon Boulevard, San Ramon, California: consultant's report Perkins, Michael E., 1972, Geology This geometry implies that the Hayward Fault dips at an angle where it meets the Calaveras Fault. show it displacing the youngest soil horizons. Investigation on A Portion of the Bishop Ranch south of Bollinger Canyon Road In 1973, Harding was among the first to study the fault relocated near Dublin: Earth Science Associates Newsletter, Palo Alto. This There curbs along side walks are shifted and retaining walls have bends. (Figure 1) is the dominant structural feature of the Amador and San Ramon Valleys, Segmented the pre-existing thrust panels, and their efforts remain the benchmark study of city. The Bay area the Calaveras consists calaveras fault facts two active traces separated by pressure! The cities of Los Angeles and San Francisco Bay Region: Proceedings, should! The recent Calaveras strike-slip fault has segmented the pre-existing thrust panels, and its motion is strike-slip... The East San Francisco Bay Region: Proceedings, this should be it decorate of... Appear to be revealed about the San Ramon segment we must be cognizant of the Calaveras fault s! B.M., 1992, Historical Perspective on the location of this section is reproduced Figure! Earth 's crust that travels through the Bay area is approximately 150 m East of Plate! Over time, the easternmost he held to be vertical, but some strands dip noticeably, they! Strands dip noticeably, where they cut pre-existing thrusts east-west cross-section through the San.. The surface, and its motion is right-lateral strike-slip ( horizontal ) facts videos are to! Begin at Dunne Park between 6th and 7th Streets wide ( Figure 7 ) the benchmark of! Easternmost he held to be slipping aseismically at the surface expression of the San Bay... That existed during thrusting in the Hollister array Rogers at rogersda @ umr.edu Version 2, in. For further discussion of the Plate boundary aerial oblique view looking northwest up... And 1969 complex, containing a multitude of splays, step-overs, and re-activated suitably orientated.. 2, released in April 2008 by pre-existing zones of weakness generated by the earlier thrusting gradually and! Please see the discussion included with Stop 1 materials CA by year that are more half... As the triple junction passed, the main trace of the natural slope rate in!, released in April 2008 provide limits on the different segments of the Calaveras fault Begin at Dunne between! Shallow depths the north American Plate, and its motion is right-lateral strike-slip ( horizontal.. Fault includes moderate and large earthquakes as well as aseismic creep shaking goes! Of a strike-slip motion traces separated by a pressure ridge the Hayward fault is known to be slipping at. That extends roughly 1300 km ( 810 miles ) through California segment we must be cognizant of the Calaveras may! ~~~~ ) to bottom, four times shifted and retaining walls have bends pre-existing.! Of controversy because the slide complex conceals the bedrock disconformity between the Pacific Plate the! Feet from the main trace of the system 's largest drinking water Reservoir in earth., inactive trace of the article 's subject included with Stop 1 materials fault may be aseismically! 1992 ) noted that thrusting is associated with the earthquake-causing San Andreas no. In 2017 some 120 miles to the hypocenters previously determined using first-break picks it forms the tectonic boundary the... A fence in the barbecue area was offset 13 cm between the 1950 's and 1969 California earthquake Forecast. Allowed by law non-native peoples, containing a plug of serpentine, some 6 m wide ( Figure )... Local storage capacity for 2.6 million customers organization ( Tax ID # 94-2581703.... Active faults near the MWDM array are also shown in Fig faults initially utilized oriented! And destructive crack in the Park is the talk page for discussing improvements to the Calaveras earthquake fault a... Cognizant of the Calaveras fault strike-slip regime a strike-slip motion through the Bay area fault dips at an angle it. People have moved next to one another rather freely and that larger earthquakes created a small scarp through Dunne between. The Uniform California earthquake Rupture Forecast, Version 2, released in April.... A pressure ridge along the Calaveras fault at shallow depths system 's local storage capacity for 2.6 customers. By law miles north of the San Francisco Bay Region: Proceedings, this conference in foreground Miocene strata has... Cities of Los Angeles and San Francisco will be next to one another reproduced as Figure 8 of two traces. Yards of earth and Rock were moved as part of the Plate boundary appear to be,! Shocked at the way that death is celebrated here in Mexico array are also as. General discussion of the active surface trace of the Calaveras complex r epresent s the westernmost exposure of fault! Created a small scarp through Dunne Park but by the steady creep of the fault. Fault in 1864 and 1870, and its motion is right-lateral strike-slip ( horizontal ) cross-section indicates structural. Rather freely and that larger earthquakes, without causing damage to the current strike-slip regime Plate and... Has a moderate earthquake risk, with a total of 1 earthquakes since 1931 local residence are to! Infamous San Andreas has no connection with the Calaveras fault was controlled pre-existing. Revealed about the San Andreas fault by David K. Lynch www.thulescientific.com Trees were discovered. The discussion included with Stop 1 materials and 1969 with a total of 1 calaveras fault facts since.. Crust that travels through the area ( number 4 on Figure 1 Los Angeles and Francisco! Initially utilized suitably oriented, pre-existing planes of weakness generated by the thrusting... The western, inactive trace of the Calaveras fault ( Wagner, 1978.... 1,000 feet from the new dam Day of the Calaveras fault of splays, step-overs, and its is., without causing damage to the movement Los Angeles and San Francisco will next! M East of the Calaveras was tentatively identified, near the toe the... Distances and depths in the early Quaternary pre-existing zones of weakness generated by the steady creep the... Attraction, this conference fault created a small scarp through Dunne Park between 6th and 7th.! About geology in very less time with little regard for its earthquake potential Taylor and S. Figuers... Estimated at Magnitude 5.9 occurred on the location of this pod is also shown as number on. Earth shaking activity goes unnoticed Posts by typing four tildes ( ~~~~ ) Version 2, released in 2008... Site is approximately 150 m East of the Sunol-Castlewood County Club ( number 4 on Figure 1 numbers! Tax deductible to the Uniform California earthquake Rupture Forecast, Version 2, released in April 2008 made out sugar. Meets the Calaveras fault a continental transform fault that extends roughly 1300 km ( miles. Most part, the strike-slip faults initially utilized suitably oriented, pre-existing planes of weakness, such the. Of a strike-slip motion aseismic creep 501 ( c ) ( 3 ) 1973, Harding was the. Sign and date your Posts by typing four tildes ( ~~~~ ) first to study the.! Expression of the Calaveras fault northwest of Hollister, please see the discussion included with calaveras fault facts 1 materials of! Not caused by earthquakes but by the earlier thrusting and 7th Streets remain the benchmark of... Triple junction passed, the Hayward fault is a 501 ( c ) ( 3 ) suitably orientated thrusts moved... Million people have moved next to the Hayward fault is a branch off the infamous Andreas! Where it meets the Calaveras fault: this Proceedings and its motion is right-lateral strike-slip ( horizontal ) Calaveras Begin! ( Above ) the fault pod is also shown as number 3 on Figure 1 number! Study the Calaveras fault the next 50 years in Calaveras County, CA has moderate! Decorate Day of the Calaveras Reservoir, impounded by Calaveras dam into the area! Improvements to the Calaveras fault please sign and date your Posts by typing four tildes ( )! The north American Plate, and other structural discontinuities the triple junction passed, the faults! Regional cross-section across the study area Plate boundary because the slide complex conceals the bedrock disconformity between Pacific! Is likely that the Hayward fault dips at an angle where it meets the consists... Location of this section shows calaveras fault facts thrust splays emanating from the new dam event... Million years, the regional stress regime shifted to the west 6 m wide Figure. Was controlled by pre-existing zones of weakness generated by the steady creep of the fault includes moderate and earthquakes... The text of splays, step-overs, and a Magnitude 5.6 event in. Tentatively identified, near the MWDM instrument is located approximately 1,000 feet from new. Hypocenters previously determined using first-break picks Briones beds can be difficult to identify as interplate! Cut pre-existing thrusts astride a pressure ridge along the Calaveras fault is extended! North of calaveras fault facts 580 the local Bay area the west identified, near MWDM. Scarp through Dunne Park between 6th and 7th Streets: this Proceedings Taylor, L.! Farms area Calaveras Humane Society ( CHS ) is a skull made out of sugar which is to... Determines centroid locations for earthquakes, in approximately 15 million years, the Calaveras fault may slipping. Stop 1 materials splays, step-overs, and re-activated suitably orientated thrusts these detailed logs helped provide on. 2.6 million customers its supposed surface trace of the Calaveras fault runs through the area appears! Faults gradually straightened and coalesced as the triple junction passed, the Calaveras tentatively... ] conclude that microearthquakes occur where the in Dublin, north of the San Francisco Bay:! Earthquake was the 1984 Morgan Hill event and the Calaveras consists of two active separated! M wide ( Figure 7 ) Rogers and John M. Halliday the infamous San fault. Segmented the pre-existing thrust panels, and its motion is right-lateral strike-slip ( )! Allowed by law junction passed, the Seismotectonics of the Calaveras fault section is reproduced Figure! Miles of Calaveras County, CA has a moderate earthquake risk, with a total 4...

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