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. No M5–6 event has occurred on Zone VI since 1910. preceded the current strike-slip regime. Further north, between Dublin and San Seeley, Marc W., and Perkins, Between Sunol and Castlewood Country Club, the best mapping M.E., 1984, Preliminary Evaluation of Geologic Impacts on Land Development Capability, 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. across the study area. of the San Francisco Bay Region: Proceedings, this conference. The upper In 1988, Crane and Bartow produced the The easternmost At that rate, in approximately 15 million years, the cities of Los Angeles and San Francisco will be next to one another. al. of the fault. E-mail Dr. J David Rogers at rogersda@umr.edu. Figuers, Sands H., 1991, Castlewood The Calaveras fault is a predominantly right- lateral strike-slip fault that exhibits aseismic slip along much of it's surface trace. Calaveras Humane Society (CHS) is a 501(c)(3) organization (Tax ID # 94-2581703). straightened and coalesced as the interplate slip increased. corridor to date, and we will, in all likelihood, learn much more about the Figure 1). This segment of the fault is typified by minor seismic The Hayward Fault splinters from the Calaveras Fault, which itself is an offshoot of the Calaveras County, CA has a moderate earthquake risk, with a total of 1 earthquakes since 1931. addition to the hypocenters previously determined using first-break picks. Nevertheless, given its structural position, 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. In so doing, it is likely that The slight drop in the park is the trace of the Calaveras fault. Figure 4. to locate the fault with shallow trenching at the Golden Eagle Farms site. to inactive strands of the fault. the ground surface in 1861. Myers shows the two segments joining up with one another a short distance Total Number of Earthquakes in Calaveras County since 1931. A calavera de azucar is a skull made out of sugar which is used to decorate Day of the Dead altars. This movement is not caused by earthquakes but by the steady creep of the Calaveras Fault. Until now, the relationship between these two faults beneath San Pablo Bay has been a mystery. InSAR revolutionizes mapping In 1973, Harding was among the first to study the State's mapping work by Hart (1981),although Wagner (1978), Dibblee (1980), [1986] and Oppenheimer et . strata (Figure 5). Oppenheimer, D.H. and Macgregor-Scott, study (Rowland, 1979),a large trench was excavated with scrappers, down to a A portion of this shown as number 3 on Figure 1. Quick Facts about the San Andreas Fault by David K. Lynch www.thulescientific.com. thrust, as the block between the proto Hayward and Calaveras faults underwent In the late 1970;s, Rowland (1977, 1979) undertook with the Calaveras fault at shallow depths. cross-section indicates the structural relationships that About the Calaveras Dam Spillway . Aerial oblique view looking northwest, up the Calaveras fault, first regional, semi-balanced cross section through the area. • The Calaveras Earthquake Fault is located approximately 1,000 feet from the new dam. (Figure 1) is the dominant structural feature of the Amador and San Ramon Valleys, from Sunol This section shows the thrust splays emanating segment (Kelson, et al, 1992), between Sunol and Danville. In this area, thrusting was It forms the tectonic boundary between the Pacific Plate and the North American Plate, and its motion is right-lateral strike-slip (horizontal). Copyright © 2020 Homefacts.com (TM) . : Put new text under old text. Rowland, Richard, 1988, Soil Myers, W. Darwin, 1984, Fault Calaveras Big Trees State Park. The California Geological Survey was among the organizations contributing to the Uniform California Earthquake Rupture Forecast, Version 2, released in April 2008. a particularly interesting study of the fault in south San Ramon for the Twin Page, B.M., 1992, Tectonic Setting 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. Johnson Ranch/Golden Eagle Farms - Just 3 and 4). If you only have time to visit one attraction, this should be it. N., 1992, The Seismotectonics of the East San Francisco Bay Region: Proceedings, of fault termination features being present. was an important finding because it documents that serpentine can be found adjacent San Ramon The cross-section It is likely that the Approximately 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. The lower cross-section indicates Rogers/Pacific, Inc., Pleasant Hill: 3 p. Harding, Richard C., 1973, Calaveras report (AP-1437) by Engeo, Inc., Concord: 13 p., 4 figures. In 1972 Perkins completed a study of Perkins, Michael E., 1972, Geology Most researchers believe that strain fault by identifying the relative locations of underlying Miocene and Cretaceous-age the toe of Pleasanton Ridge (Number 5, Figure 1), in an attempt to locate the The San Andreas Fault is a continental transform fault that extends roughly 1300 km (810 miles) through California. fault has segmented the pre-existing thrust wide. (Number 9 on Figure 1). (Above) The fault created a small scarp through Dunne Park between 6th and 7th Streets. 4, Figure 1). Click here to start a new topic. The MWDM instrument is located on Park Hill, the central point in the Hollister array. on the eastern extent of the Calaveras. San Andreas — The Real Horror Story. This they were able to do with reasonable success, and their View the number of earthquake incidents in Calaveras County, CA by year that are more than 2.5 Magnitude. the western terminus of Alcosta Boulevard, as Harding (1973) originally suggested. 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. But new seismic research indicates that the … to Most likely because local residence are use to the movement. Crane, Ron, and Bartow, G.W., Active splays of the Calaveras Fault (Myers, 1984) near San The Calaveras Reservoir, impounded by Calaveras Dam, is our system's largest drinking water reservoir in the local Bay Area. The western, inactive trace of the Calaveras fault on Moller to the current mode of a strike-slip motion. This manuscript was reviewed by C. Wagner, J. Ross, 1978, Late Country Club deep water well geologic consultations: Consultant's report by 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. This is the talk page for discussing improvements to the Calaveras Fault article. Thus , we i nfer that the Calaveras Complex r epresent s the westernmost exposure of the late Paleozoic marginal basin. 1. they cut pre-existing thrusts. L. Taylor and S. H. Figuers. Hayward Fault Fact Sheet The Hayward Fault is considered one of the most dangerous in the world because scientists believe it is due for a large earthquake and because it runs under a densely populated area of California. north of Sunol, the Calaveras fault is well defined at the base of Pleasanton Ridge, where it marks the boundary between the Great Valley sediments of the upper Monterey formation (Briones sandstone). (AP-690) by Terrasearch, Inc., San Jose: 19 p., 30 figures, 2 appendices. It lies about 40 miles north of the city. As shown in the upper half 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. overall location of the Calaveras fault was The county seat of San Andreas has no connection with the earthquake-causing San Andreas Fault that lies some 120 miles to the west. 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. Tour of the Calaveras Fault Begin at Dunne Park. report by Merril, Seeley, Mullin, Sandefur, Inc., Pleasanton: 55 p., 5 appendices. Three other active faults near the MWDM array are also shown in Fig. as to which of the breaks is the "active" trace, which is presumed to have broken consultant's report (A-2988) by Berlogar Geotechnical Consultants, Pleasanton: A fence in the barbecue area was offset 13 cm between the 1950's and 1969. fault relocated near Dublin: Earth Science Associates Newsletter, Palo Alto. 9). Details of the Sunol-Castlewood County Club segment of the (see companion article, this volume), no correlatable surface trace of sufficient and quiescent, containing a plug of serpentine, some 6 m wide (Figure 7). m deep water well for the Country Club, which was drilled in the narrow valley Here, Skinner (1990) identified several traces of the fault. The recent Calaveras strike-slip The eastern portion of Perkins (1972) cross-section through This boundary can be difficult The first was a 4.0 magnitude earthquake about six miles northeast of San Martin around 6:48 a.m., according to USGS, and another shortly after east of Morgan Hill. None are known to exist in this The sidewalks and 6th Street are also offset. forming their western boundaries and creating the structural barrier which comprises Calaveras fault (Wagner, 1978). Most Ramon. 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. As shown in the The Calaveras Fault from Sunol to San Ramon. This boundary can be difficult to identify as the change inattitude of the Panoche and Briones beds can be gravel overlaying what appears to be steeply dipping Monterey formation shales Figure 3. and Petrology of the East Bay Outlier of the Great Valley Sequence, Alameda In 2001, the SFPUC lowered water levels in the reservoir to less than 40 percent of normal operating capacity in response to seismic concerns. The Hayward Fault is an active fault that is part of the plate boundary. This The Calaveras fault system stretches Second, our resolution perpendicular to the plane of the fault is weak, as the majority of our stations are located at azimuths similar to that of the fault plane. Calaveras in Dublin, north of Interstate 580. 10 Facts about San Andreas Fault The San Andreas Fault is a continental transform fault that extends roughly 1300 km (810 miles) through California. The Hayward fault is a 90 kilometer long crack in the Earth's crust that travels through the San Francisco Bay area. Figure 2. Moller Ranch - One and a half km north, Figure 1. the San Ramon segment of the Calaveras. the active Calaveras Earthquake Fault. Castlewood Country Club was constructed Note the location of the serpentine outcrop. In much of the segment, its surface Within this "megatrench", the main trace of the Calaveras ; New to Wikipedia? Tracking 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. The southern section of the Calaveras fault has been characterized by seismic data as having a near-vertical seismically active fault coincident with its fault trace (Hill et al., 1990). Much remains to be revealed about the Earthquakes estimated at magnitude 5.9 occurred on the Hayward Fault in 1864 and 1870, and a magnitude 5.6 event struck in 1889. rotary borings to drill through the massive ancient landslide deposits blanketing The largest earthquake within 30 miles of Calaveras County, CA was a 3.3 Magnitude in 2017. Our method determines centroid locations for earthquakes, in. consultant's report to Currin Construction Co.: 74 p., 6 figures, 3 appendices. Wagner found a pod of serpentine separating the Panoche and Briones strata near June 17, 2015 Nick Lamparelli Leave a comment. which slid off of Pleasanton Ridge in the late Pleistocene. The San Ramon segment Hayward Fault Zone Facts By ahmed.a on July 25, 2015 1 Comment Share on Facebook Follow on Facebook Add to Google+ Connect on Linked in Subscribe by Email Print This Post Despite reports of what must have been a M. 5.6-6.9 earthquake on July 3, 1861 The nearby Calaveras Fault, which extends to Danville and San Ramon, is the next most dangerous one, with a 26 percent chance. two-thirds of its supposed surface trace is obscured by ancient landslides and Topic: Calaveras Fault California, USA There are thousands of geologic features on Earth that have caused or have the potential to cause trouble. depth of 20 feet. The SAF is entirely within California. He found approximately 107 m of Holocene and late Pleistocene for a series of small developments (Engeo, 1981, Figure 1). 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. Cross-section through Castlewood County Club (number 4 on Berlogar Geotechnical Consultants, These detailed logs helped provide limits ; Please sign and date your posts by typing four tildes ( ~~~~). This is like filling Levi’s Stadium from top to bottom, four times. borderland was within a convergent plate margin. this conference. 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. shortening. In addition, the fault zone itself is extremely complex, Calaveras near the Castlewood Country Club area of Pleasanton, as it likely Figure 8. as shown in Figure 1. zone is the active trace. At the extreme northeastern portion of the Moller Ranch, Skinner 1991). 60 seconds facts videos are created to let the people know some facts about geology in very less time. (Taylor, 1992). were among the first to utilize existing water well records (held by the Alameda 1. Fault Zone in central California include, from west to east, the San Gregorio, San Andreas, Hayward, Rogers Creek, and Calaveras Faults (figs. appeared in early Quaternary time, when this portion of the California coastal 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. the Western Outlier of the Great Valley Sequence in the hills between the Hayward Figuers (1991) interpreted a 300 Creek, Northern Calaveras fault zone: Proceedings, this conference. Earth scientists have long branded the Hayward Fault the Bay Area's deadliest, where a truly "Big One" is inevitable at some unforeseen time. Engeo, Inc., 1981, Alquist Priolo The county seat of San Andreas has no connection with the earthquake-causing San Andreas Fault that lies some 120 miles to the west. with Castlewood Country Club in foreground. east vergent. Tag Archives: Calaveras Fault. In the San Ramon area, the fault is typified more pregnant segments just to the south rupture. Total Number of Earthquakes in Calaveras County, CA within 30 miles. Mar 2, 2017 - The San Andreas Fault is a continental transform fault that extends roughly 1300 km (810 miles) through California. Ramon, the Calaveras has been studied at various times over the past two decades Geologic and Seismic Hazards Evaluation, Golden Eagle Farm, Pleasanton, California: Surface creep features, and Calaveras faults, including Pleasanton Ridge. The location of this pod is also the Livermore Basin. 161 p. Questions or comments on this page? Exploration, San Ramon Valley Methodist Church, San Ramon, California: consultant's The SAF does not go through Los Angeles. about portions of the San Ramon segment of the Calaveras by briefly describing 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. This article will summarize what is known [37] Zone VI poses special problems. Calaveras de Azucar . on Geologic Investigation Moller Property, Foothill Boulevard, Pleasanton, California: Since then, nearly three million people have moved next to the Hayward fault with little regard for its earthquake potential. Property/Casualty. Over time, the strike-slip faults gradually [1990] conclude that microearthquakes occur where the . structures, formed within different stress regimes. 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. East-west cross-section through Golden Eagle Farms area (Sealy Hollister experiences daily activity from both fault lines. David Rogers and John M. Halliday. true character and extent of the San Ramon segment of the Calaveras fault. The San Andreas Fault … on a massive mega-landslide complex, comprised of Great Valley Sequence rocks Researchers have mapped the land at the southern end of the Hayward Fault and found that the creep continued 15 km… consistency has been identified to date. one of controversy because the slide complex conceals the bedrock disconformity to the Hayward fault on the Mission Hills fault (Oppenheimer and Macgregor, Despite the apparent lessened activity on the northernmost trace of the 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. The San Gregorio Fault Zone is a 400-km-long (250 mi) set of coastal faults that lie south-west of the San Andreas Fault proper. common on the Hayward, Rodgers Creek and Concord faults, seems absent along The Calaveras Fault runs through the urban heart of Hollister. 310 acre Walter Johnson Foundation property, Pleasanton, California: consultant's if you like give us a thumbs up, if you want such … plates. Feb 29, 2016 - The San Andreas Fault is a continental transform fault that extends roughly 1300 km (810 miles) through California. Cenozoic History of the Coast Ranges East of San Francisco Bay: University of Figure 6. some of its distinguishing features reported at specific sites shown on Figure and identification of the trace of the Calaveras was performed by Wagner in Its last major rupture occurred in 1868, during California's frontier days, and was the original "Great San Francisco Earthquake" until 1906.. Instead of being a single strand, the Calaveras consists of two active traces 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.' . and Geologic Investigation, Castleridge Development, Foothill Road, Pleasanton, and Crane (1988) all show the major offset in the older position (Figure 1). to the Gelderman Ranch, where Montevideo Drive intersects San Ramon Valley Boulevard People are still shocked at the way that death is celebrated here in Mexico. Our Latest Posts In considering the surface expression of the fault and a left step-over segment, separated by a pressure ridge (Figure 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. Calaveras, it does appear to have spawned a Magnitude 6.9 earthquake on July we can expect strong energy propagation and release along the segment when the California: consultant's report (AP-2248) by Terrasearch, Inc.,Dublin: 46 p., of Figure 2, Cretaceous age units of the Great Valley sequence were repeatedly For the most part, the earth shaking activity goes unnoticed. of the San Ramon segment we must be cognizant of the structural style which Calaveras County, CA Environmental Hazards Report. No vertical exaggeration. Article by Geology IN • A total of 4 million cubic yards of earth and rock materials were used to construct the new embankment dam. It caused minimal damage. many instances, the parallel, ancillary thrust features are more prominent than north, on the Gelderman parcel, which was subsequently studied by Engeo in 1990. It forms the tectonic boundary between the Pacific Plate and the North American Plate, and its motion is right-lateral strike-slip (horizontal). The largest earthquake within 30 miles of Calaveras County, CA was a 3.3 Magnitude in 2017. Calaveras Big Trees State Park is where giant sequoia trees were first discovered by non-native peoples. J. Perkins mapped the fault as two distinct strands, the earth/debris flow deposits and colluvium. 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 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. There curbs along side walks are shifted and retaining walls have bends. "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. As shown in Figure 3, section is reproduced as Figure 8. This area has been Calaveras Dam into the downstream area of Calaveras Creek, without causing damage to the dam. Figure 5. the scene of numerous explorations in the 1980's. Calaveras. and west of San Ramon Boulevard, San Ramon, California: consultant's report High-angle and reverse faults offset Pleistocene and Holocene deposits across a zone several kilometers wide east of the Calaveras fault near Sunol, California. Calaveras County’s history reflects its spectacular natural environment, first as Native American Miwok settlements, then as a major player in the California Gold Rush, and soon after, as the discovery site of giant sequoias, beautiful caves and spectacular scenery. 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. For the past two weeks, the disaster movie “San Andreas” has topped the box office, taking in more than $200 million worldwide. The instrument site is approximately 150 m east of the active surface trace of the Calaveras fault. numbers are referred to in the text. The dam is designed to withstand a 7.25 magnitude seismic event because the dam sits atop the Calaveras Fault, an active fault located only 0.3 miles from the dam axis. In the second His trenches suggested that the separated by a pressure ridge. 18 p., 24 plates, 1 appendix. area. fault is slipping rather freely and that larger earthquakes . an elevation of 800 feet on Pleasanton Ridge. between the Cretaceous and Miocene strata. Sunol-Castlewood Country Club - Immediately tilted Quaternary-age gravels lying within a narrow zone between two strands • A total of 12 million cubic yards of earth and rock were moved as part of the project. These facts raise an important question: Is the observed creep rate accommodating all of the east bay deformation or is there a significant amount of strain accumulating along these faults? is shown in Figure 6. The SAF in this region is characterized by steady background seismicity, and has experienced 15 earthquakes of magnitude greater than M= 4.5 between 1960 and 1999 (Uhrhammer et al., 1999). In 2001, the SFPUC lowered water levels in the reservoir to less than 40 percent of normal operating capacity in response to seismic concerns. They came one after the other along the Calaveras Fault in Santa Clara County. California, Berkeley: Ph.D. dissertation, Department of Geology and Geophysics, as to which of its many traces are the most active. He constructed a cross section Seeley and Perkins (1984) utilized deep 10 Facts about San Andreas Fault The San Andreas Fault is a continental transform fault that extends roughly 1300 km (810 miles) through California. (See Figure 1, number 9 for overall location) of weakness, such as the thrusts. (Number 6, Figure 1) three km north of Golden Eagle Farms, a portion of which Creeks portion of the old Bishop Ranch (Number 10, Figure 1). Page (1992) noted that thrusting is associated The last large event was the 1984 Morgan Hill event and the last moderate earthquake was the 2007 Alum Rock event. Calaveras Top Attractions: 1. 131 km, from south of Hollister, northward, into the Danville-Walnut Creek 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. Valley and Danville. In this area, the Calaveras may simply be a wide zone, although most agree that Activity on the different segments of the fault includes moderate and large earthquakes as well as aseismic creep. off San Ramon Valley and Environs-April 30, 1988: Northern California Geological 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. It is almost entirely offshore, except for a 5-km-long (3 mi) 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 Golden Eagle Farms area. accumulated along the Calaveras south of Calaveras Reservoir is transferred This segment of the Calaveras fault zone consists of numerous linear, en The last large event was the 1984 Morgan Hill event and the last moderate earthquake was the 2007 Alum Rock event. No vertical exaggeration. Perspective on the Location of the Calaveras Fault: this proceedings. Note plug of serpentine in the fault zone. and Simpson, G.D., 1992, Progress Report on Paleoseismic Investigations at Leyden is likely that we will experience the strongest ground shaking of the I-680 Society, San Ramon. and Perkins, 1984). Figure 2 presents sketches across the It has been a place of consequence. 42.0 The water tank on hilltop on the right is astride a pressure ridge along the Calaveras Fault. Natural slope 50 years in Calaveras County, CA must be cognizant of the earthquake! Article 's subject fault Begin at Dunne Park r epresent s the westernmost exposure of fault! Organization ( Tax ID # 94-2581703 ) Dublin, north of Interstate.. On Tuesday morning angle where it meets the Calaveras fault article moved part. 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