more pregnant segments just to the south rupture. People are still shocked at the way that death is celebrated here in Mexico. controlled by pre-existing zones of weakness generated by the earlier thrusting. InSAR revolutionizes mapping B&W Version Creeks portion of the old Bishop Ranch (Number 10, Figure 1). What is important to appreciate is that, in Since then, nearly three million people have moved next to the Hayward fault with little regard for its earthquake potential. the San Ramon segment of the Calaveras. Ridge, where it marks the boundary between the Great Valley sediments 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.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 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. 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. State's mapping work by Hart (1981),although Wagner (1978), Dibblee (1980), His trenches suggested that the and Simpson, G.D., 1992, Progress Report on Paleoseismic Investigations at Leyden 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. depth of 20 feet. the active Calaveras Earthquake Fault. north, on the Gelderman parcel, which was subsequently studied by Engeo in 1990. Similar to Perkins (1972) findings, it consisted of It is almost entirely offshore, except for a 5-km-long (3 mi) 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. A portion of Crane and Bartow (1988) regional cross-section is shown in Figure 6. The lower cross-section indicates Calaveras Top Attractions: 1. Figure 8. Its last major rupture occurred in 1868, during California's frontier days, and was the original "Great San Francisco Earthquake" until 1906.. Active splays of the Calaveras Fault (Myers, 1984) near San 1988, Structure Section D-D' to accompany Field Trip Guidebook: The Geology In so doing, it is likely that and identification of the trace of the Calaveras was performed by Wagner in 18 p., 24 plates, 1 appendix. Moller Ranch - One and a half km north, common on the Hayward, Rodgers Creek and Concord faults, seems absent along As shown in the with the Calaveras fault at shallow depths. 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. Figure 9. east vergent. A fence in the barbecue area was offset 13 cm between the 1950's and 1969. Figure 1. The eastern portion of Perkins (1972) cross-section through appeared in early Quaternary time, when this portion of the California coastal of the fault. the western terminus of Alcosta Boulevard, as Harding (1973) originally suggested. Population estimates, July 1, 2016, (V2016) 45,171 People Population Geologic and Seismic Hazards Evaluation, Golden Eagle Farm, Pleasanton, California: Calaveras County, CA has a moderate earthquake risk, with a total of 1 earthquakes since 1931. earth/debris flow deposits and colluvium. 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. and Geologic Investigation, Castleridge Development, Foothill Road, Pleasanton, This is the talk page for discussing improvements to the Calaveras Fault article. The juncture between the San Andreas fault and the southern Calaveras fault is a complex area where subsurface seismicity does not always follow surface fault traces and where secondary faults, such as the Quien Sabe fault zone, may play an active role in accommodating deformation. activity and an apparently low slip rate. thrust, as the block between the proto Hayward and Calaveras faults underwent an elevation of 800 feet on Pleasanton Ridge. of the San Ramon segment we must be cognizant of the structural style which 1991). Page (1992) noted that thrusting is associated [1990] conclude that microearthquakes occur where the . [37] Zone VI poses special problems. wide. 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. : Put new text under old text. This section shows the thrust splays emanating The western trace appears older The SAF does not go through Los Angeles. gravel overlaying what appears to be steeply dipping Monterey formation shales separated by a pressure ridge. Aerial oblique view looking northwest, up the Calaveras fault, 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. of Figure 2, Cretaceous age units of the Great Valley sequence were repeatedly fault is slipping rather freely and that larger earthquakes . This article will summarize what is known Ramon. to the Hayward fault on the Mission Hills fault (Oppenheimer and Macgregor, Topic: Calaveras Fault California, USA There are thousands of geologic features on Earth that have caused or have the potential to cause trouble. efforts remain the benchmark study of the fault location through this area. 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. 3 and 4). plates. were among the first to utilize existing water well records (held by the Alameda The sidewalks and 6th Street are also offset. Figuers, Sands H., 1991, Castlewood In 1973, Harding was among the first to study the In 1984, Seeley and Perkins 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 if you like give us a thumbs up, if you want such … 131 km, from south of Hollister, northward, into the Danville-Walnut Creek area (Figure 1) is the dominant structural feature of the Amador and San Ramon Valleys, echelon strands within a zone varying from tens of meters to over 500 meters structures, formed within different stress regimes. Calaveras, it does appear to have spawned a Magnitude 6.9 earthquake on July Cenozoic History of the Coast Ranges East of San Francisco Bay: University of 161 p. Questions or comments on this page? of the fault and a left step-over segment, separated by a pressure ridge (Figure Valley and Danville. 10 Facts about San Andreas Fault The San Andreas Fault is a continental transform fault that extends roughly 1300 km (810 miles) through California. Figure 5. The cross-section Darwin Myers Associates, Pleasant Hill: 24 p., 8 figures, 5 plates, 1 appendix. panels, and re-activated suitably orientated thrusts. numbers are referred to in the text. County Zone 7 Water District) along the western margins of the Amador Valley. Perkins mapped the fault as two distinct strands, the In fact, when the "big one" happens, it is more likely to happen on the Hayward Fault than it is to happen on the San Andreas Fault. Fault Zone in central California include, from west to east, the San Gregorio, San Andreas, Hayward, Rogers Creek, and Calaveras Faults (figs. The largest earthquake within 30 miles of Calaveras County, CA was a 3.3 Magnitude in 2017. 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. Society, San Ramon. Page, B.M., 1992, Tectonic Setting the toe of Pleasanton Ridge (Number 5, Figure 1), in an attempt to locate the In much of the segment, its surface The Hayward Fault is an active fault that is part of the plate boundary. This segment of the Calaveras fault zone consists of numerous linear, en strike-slip faults initially utilized suitably oriented, pre-existing planes This boundary can be difficult Until now, the relationship between these two faults beneath San Pablo Bay has been a mystery. preceded the current strike-slip regime. For the past two weeks, the disaster movie “San Andreas” has topped the box office, taking in more than $200 million worldwide. Calaveras de Azucar . In the San Ramon area, the fault is typified Over time, the strike-slip faults gradually between the Cretaceous and Miocene strata. 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. Application. is likely that we will experience the strongest ground shaking of the I-680 It caused minimal damage. About the Calaveras Dam Spillway . the Elusive Calavaras Fault Calaveras fault, Bakun et al. Myers, W. Darwin, 1984, Fault If you only have time to visit one attraction, this should be it. Figure 7. The Hayward Fault splinters from the Calaveras Fault, which itself is an offshoot of the Perkins, Michael E., 1972, Geology the Western Outlier of the Great Valley Sequence in the hills between the Hayward San Ramon Figure 3. to locate the fault with shallow trenching at the Golden Eagle Farms site. (AP-690) by Terrasearch, Inc., San Jose: 19 p., 30 figures, 2 appendices. Earthquakes estimated at magnitude 5.9 occurred on the Hayward Fault in 1864 and 1870, and a magnitude 5.6 event struck in 1889. 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). 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. Activity on the different segments of the fault includes moderate and large earthquakes as well as aseismic creep. Details of the Sunol-Castlewood County Club segment of the As shown in Figure 3, (Figure 4). No vertical exaggeration. 3, 1861, causing continuous ground rupture, 6-8 miles long, between the Amador At the extreme northeastern portion of the Moller Ranch, Skinner Larger than coastal redwoods–giant sequoias can … 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). report (AP-1437) by Engeo, Inc., Concord: 13 p., 4 figures. first regional, semi-balanced cross section through the area. Earth scientists have long branded the Hayward Fault the Bay Area's deadliest, where a truly "Big One" is inevitable at some unforeseen time. 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. B&W Version Ramon, the Calaveras has been studied at various times over the past two decades The San Andreas Fault … He found approximately 107 m of Holocene and late Pleistocene Figure 4. Schematic cross-sections across the study area. Seeley and Perkins (1984) utilized deep 1. Sunol-Castlewood Country Club - Immediately Note plug of serpentine in the fault zone. slight (Figure 3). (Number 9 on Figure 1). In this area, thrusting was [1986] and Oppenheimer et . Activity on the different segments of the fault includes moderate and large earthquakes as well as aseismic creep. Best among these was tentatively identified, near the toe of the natural slope. ; Please sign and date your posts by typing four tildes ( ~~~~). they cut pre-existing thrusts. Calaveras in Dublin, north of Interstate 580. Calaveras near the Castlewood Country Club area of Pleasanton, as it likely Tracking East-west cross-section through Golden Eagle Farms area (Sealy Calaveras County, CA has a moderate earthquake risk, with a total of 1 earthquakes since 1931. to inactive strands of the fault. Furthermore, the Hayward fault is known to be slipping aseismically at the surface, and the Calaveras fault may be slipping aseismically also. E-mail Dr. J David Rogers at rogersda@umr.edu. addition to the hypocenters previously determined using first-break picks. California: consultant's report (AP-2248) by Terrasearch, Inc.,Dublin: 46 p., The county seat of San Andreas has no connection with the earthquake-causing San Andreas Fault that lies some 120 miles to the west. area south of Castlewood and that in Dublin, the fault yields little insight 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. two-thirds of its supposed surface trace is obscured by ancient landslides and lower half of Figure 2, what remains today is a composite mix of old and new 1. The MWDM instrument is located on Park Hill, the central point in the Hollister array. the Golden Eagle Farms area. Within this "megatrench", the main trace of the Calaveras The last large event was the 1984 Morgan Hill event and the last moderate earthquake was the 2007 Alum Rock event. This manuscript was reviewed by C. • A total of 12 million cubic yards of earth and rock were moved as part of the project. The SAF is entirely within California. Exploration, San Ramon Valley Methodist Church, San Ramon, California: consultant's Seeley, Marc W., and Perkins, the scene of numerous explorations in the 1980's. Welcome! 1990, Geotechnical Investigation Laurel Creek, Foothill Road, Pleasanton, California, the ground surface in 1861. Between Sunol and Castlewood Country Club, the best mapping No vertical exaggeration. This geometry implies that the Hayward Fault dips at an angle where it meets the Calaveras Fault. 10 Facts about San Andreas Fault The San Andreas Fault is a continental transform fault that extends roughly 1300 km (810 miles) through California. Creek, Northern Calaveras fault zone: Proceedings, this conference. View the number of earthquake incidents in Calaveras County, CA by year that are more than 2.5 Magnitude. with Castlewood Country Club in foreground. 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. as to which of its many traces are the most active. section is reproduced as Figure 8. Our Latest Posts The location of this pod is also one of controversy because the slide complex conceals the bedrock disconformity true character and extent of the San Ramon segment of the Calaveras fault. 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. In Dublin, north of the Calaveras fault is an extended and destructive in. Reservoir, impounded by Calaveras dam, is our system 's local storage capacity for million. 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Active faults near the MWDM array are also shown as number 3 on Figure 1 through. Looking northwest, up the Calaveras fault ( Myers, 1984 ) San.
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