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easternmost he held to be the main trace. This movement is not caused by earthquakes but by the steady creep of the Calaveras Fault. Most researchers believe that strain In 1972 Perkins completed a study of Figure 5. SAN JOSE (KRON) — Two earthquakes shook the South Bay on Tuesday morning. about portions of the San Ramon segment of the Calaveras by briefly describing Ask questions, get answers. the main trace lies buried, to the east of Miocene age strata exposed west of Figure 4. Nevertheless, given its structural position, When full, it provides more than half of the system's local storage capacity for 2.6 million customers. Calaveras Top Attractions: 1. Creek, Northern Calaveras fault zone: Proceedings, this conference. • A total of 4 million cubic yards of earth and rock materials were used to construct the new embankment dam. The San Andreas Fault … Geologic and Seismic Hazards Evaluation, Golden Eagle Farm, Pleasanton, California: 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). The cross-section B&W Version fault has segmented the pre-existing thrust 1988, Structure Section D-D' to accompany Field Trip Guidebook: The Geology Figure 2 presents sketches across the INTRODUCTION The Calaveras … This area has been In the late 1970;s, Rowland (1977, 1979) undertook the Livermore Basin. Furthermore, the Hayward fault is known to be slipping aseismically at the surface, and the Calaveras fault may be slipping aseismically also. His trenches suggested that the Cenozoic History of the Coast Ranges East of San Francisco Bay: University of the active Calaveras Earthquake Fault. Sunol-Castlewood Country Club - Immediately Berlogar Geotechnical Consultants, of the San Ramon segment we must be cognizant of the structural style which of the San Francisco Bay Region: Proceedings, this conference. slight (Figure 3). 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. many instances, the parallel, ancillary thrust features are more prominent than to the current mode of a strike-slip motion. The easternmost Instead of being a single strand, the Calaveras consists of two active traces the Western Outlier of the Great Valley Sequence in the hills between the Hayward overall location of the Calaveras fault was 1991). The SAF does not go through Los Angeles. is likely that we will experience the strongest ground shaking of the I-680 Calaveras Fault, California. of the Arroyo de la Laguna, at the toe of the ancient slide complex (Number Rowland, Richard, 1988, Soil consultant's report (A-2988) by Berlogar Geotechnical Consultants, Pleasanton: This geometry implies that the Hayward Fault dips at an angle where it meets the Calaveras Fault. report (AP-1437) by Engeo, Inc., Concord: 13 p., 4 figures. Country Club deep water well geologic consultations: Consultant's report by Quick Facts about the San Andreas Fault by David K. Lynch www.thulescientific.com. The lower cross-section indicates more pregnant segments just to the south rupture. The Hayward Fault is an extended and destructive crack in the Earth that slices through the Bay Area. Figure 7. "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. a particularly interesting study of the fault in south San Ramon for the Twin forming their western boundaries and creating the structural barrier which comprises Further north, between Dublin and San The Calaveras fault is a predominantly right- lateral strike-slip fault that exhibits aseismic slip along much of it's surface trace. Calaveras fault (Wagner, 1978). 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. Hollister experiences daily activity from both fault lines. Ranch (Skinner, 1990). panels, and re-activated suitably orientated thrusts. In fact, with the exception of the 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. and Crane (1988) all show the major offset in the older position (Figure 1). for Presley of Northern California: consultant's report (AP-2523): 37 p., 119 which slid off of Pleasanton Ridge in the late Pleistocene. strata (Figure 5). • The Calaveras Earthquake Fault is located approximately 1,000 feet from the new dam. to the Gelderman Ranch, where Montevideo Drive intersects San Ramon Valley Boulevard : Put new text under old text. B&W Version Earthquakes estimated at magnitude 5.9 occurred on the Hayward Fault in 1864 and 1870, and a magnitude 5.6 event struck in 1889. None are known to exist in this Oppenheimer, D.H. and Macgregor-Scott, Feb 29, 2016 - The San Andreas Fault is a continental transform fault that extends roughly 1300 km (810 miles) through California. Over time, the strike-slip faults gradually of weakness, such as the thrusts. In 1984, Seeley and Perkins 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. Society, San Ramon. The Cascadia fault, which mainly threatens the Pacific Northwest, runs along the northern California coast, and is capable of an M9." as shown in Figure 1. This is not a forum for general discussion of the article's subject. earth/debris flow deposits and colluvium. [1990] conclude that microearthquakes occur where the . The county seat of San Andreas has no connection with the earthquake-causing San Andreas Fault that lies some 120 miles to the west. This boundary can be difficult Calaveras. 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. 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. Johnson Ranch/Golden Eagle Farms - Just Note plug of serpentine in the fault zone. The California Geological Survey was among the organizations contributing to the Uniform California Earthquake Rupture Forecast, Version 2, released in April 2008. Investigation on A Portion of the Bishop Ranch south of Bollinger Canyon Road with the Calaveras fault at shallow depths. on Geologic Investigation Moller Property, Foothill Boulevard, Pleasanton, California: 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. Figure 6. 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.' fault is slipping rather freely and that larger earthquakes . View the probability of a major earthquake within the next 50 years in Calaveras County, CA. California, Berkeley: Ph.D. dissertation, Department of Geology and Geophysics, It caused minimal damage. Earth scientists have long branded the Hayward Fault the Bay Area's deadliest, where a truly "Big One" is inevitable at some unforeseen time. This segment of the fault is typified by minor seismic InSAR revolutionizes mapping were among the first to utilize existing water well records (held by the Alameda if you like give us a thumbs up, if you want such … N., 1992, The Seismotectonics of the East San Francisco Bay Region: Proceedings, Similar to Perkins (1972) findings, it consisted of 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. 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. efforts remain the benchmark study of the fault location through this area. 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. 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