Upper Calaveras Fault Trail is a 2 mile moderately popular blue singletrack trail located near San Jose California. Magnitude 3.8 earthquake rattles East Bay The most active fault in the region is the San Andreas Fault; however, all of the large faults in the San Francisco Bay region that display recent earthquake activity, or that display Quaternary offset, are part of the greater San Andreas Fault System. Faults active in the Quaternary (2.6 Ma) were digitized from their original sources in order to preserve as much of the original detail as possible. The centers of these independent patches of earthquake activity are 20 km apart. Patterns of seismic activity preceding large earthquakes ... date, our crews have installed 500 feet of the new steel pipe, welded the joints, Geologic Problems With appropriate browser settings the "live" maps will also show all of the names of faults shown on the map as you rollover with the cursor. [3] Oppenheimer et al. The San Andreas Fault and 6 other significant fault zones are present in the Bay Area: the Calaveras, Concord-Green Valley, Greenville, Hayward, Rodgers Creek, and San Gregorio Faults. These . CISN: 2002 San Ramon Swarm The Calaveras and San Antonio reservoirs are part of the Hetch Hetchy water system, an improbable Rube Goldberg-like scheme to move water from the Sierra Nevada across the Central Valley, across the Calaveras Fault, across the Hayward Fault, across the liquefaction-vulnerable marshes of the southern bay, then into two long, linear sag ponds . Calaveras Fault - WikiMili, The Best Wikipedia Reader Earthquake History in the San Francisco Bay Area ... The quake occurred on the Calaveras Fault that produced the magnitude 6.2 Morgan Hill earthquake in 1984 and . The 1989 Loma Prieta earthquake occurred on the San Andreas fault within 30 km of the section of . However, for the line-source parallel with the Calaveras fault (model shown in Figure 2.49 (upper part of bottom image)), most of the slip lies to the southeast of the epicenter. The inactive Pilarcitos Fault runs almost parallel to the San Andreas Fault about two miles west of the plan area. We have prepared a finite-source inversion of the Alum Rock earthquake using the method of Dreger and Kaverina (2000). Calaveras Fault creep in downtown Hollister in April 2009. What is the difference between brittle and plastic (elastic) deformation and how do these concepts apply to earthquake activity with increasing depth? The USGS continuously monitors their activity. Understanding Earthquake Hazards in the Bay Area. The Bay Area fault system and the spot (red star) where the Hayward Fault branches off from the Calaveras Fault. 9 of 32 10 of 32 Calaveras Fault (zoomed in on northern section) Cities and towns on or near the fault: Alamo, Danville, San Ramon, Dublin, Pleasanton, Kilkare Woods, Sunol. As of July 2015, the project is 67% complete. Take the Kestrel Trail to the Sierra Vista Trail north-east, then south to the Lower Calaveras Fault Trail with its great views of Alum Rock Canyon and Alum Rock Park. The offset of Wallace Creek is caused by _____. They found a correspondence between the areas that slipped in moderate earthquakes with areas that were relatively devoid of micro-earthquake activity. The creep rate along the San Andreas Fault and nearby Calaveras Fault from this study are shown in the purple to yellow colored line. A detailed kinematic study of fault slip occurring from the surface to a depth of about 7 km on the Calaveras fault north of Hollister was conducted during the summer of 1977. "In terms of day-to-day microactivity, it's the most active fault in the San Francisco Bay area . This curb in Hollister has shifted to the right, due to the steady creep of the Calaveras Fault (Photo by: Horst Rademacher) The main difference, of course, is the distance from the epicenter. QUESTION. The fence line at Point Reyes, which still shows the shift from the quake almost 110 years ago, lies directly on the San Andreas Fault, the "host" of the . The San The Calaveras Fault, a main component of the San Andreas System, recorded The long-term slip rate on the Calaveras Fault to the south of where the Hayward Fault splays from it is thought to be 15 ± 3 mm/yr [Working Group on California Earthquake Probabilities , 1999]. 4 answers. As described in this report, the Hayward fault zone is a zone of highly deformed rocks which trends north 30 degrees west from an area . The basic tool we use to analyze these data are frequency distributions of interevent distances between earthquakes. Each region is characterized by a constant rate of seismic slip as computed from earthquake magnitudes . The Calaveras Fault, a main component of the San Andreas System, recorded earthquakes of magnitude 5.9 in 1979 and 6.2 in 1984. If that is the case, the longer fault system could produce larger temblors. The 1989 Loma Prieta earthquake occurred on the San Andreas fault within 30 km of the section of . Similar to the 1994 Fault Activity Map, the 2010 map is accompanied . 1868 magnitude 7 earthquake. (ECSZ), a region of increased seismic activity, runs from the Gulf of California through the Mojave Desert-Death Valley and into Nevada. A major reason why activity along the Calaveras Fault deserves close attention is because the USGS gives it has the second highest probability of rupturing in a large magnitude (M≥6.7) by 2043. The red line is the newly discovered surface trace connecting the southern end of the Hayward Fault to the Calaveras Fault, once thought to be an independent system. The correlations of seismic activity and fault-trace characteristics are similar to those for shocks along the creeping section of the San Andreas Fault in central California and suggest that the specific "stuck" and "creeping" patch model of Bakun et al. Looking at patterns of activity in the San Francisco Bay Area since 1948, we find an increase of activity on the Calaveras fault near San Jose beginning in the 1980s which, if our model is relevant, would forecast a large earthquake in that region. The pipeline and has been designed to withstand the force of any seismic activity from the nearby Calaveras Fault. The northern section of the Calaveras fault ruptured in a ~M6 earthquake in 1861, and surface rupture was observed over a distance of 13 km. fault location and activity levels, ground composition, materials). Indonesia, an archipelago of more than 270 million people, is prone to earthquakes and volcanic activity because it sits along the Pacific "Ring of Fire," a horseshoe-shaped series of fault lines. a fault creep along the Calaveras 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. 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 Hayward fault last produced a large quake (M6.8) in 1868. the present-day seismic hazard to the Bay Area from the Hayward is: . 1897 06 20 - Calaveras fault, California - M 6.3 1915 06 23 - Imperial Valley, California - M 6.3 1992 06 28 - Big Bear, California - M 6.5 . This multi-use trail can be used both directions and has a easy overall physical rating with a 245 ft blue climb. The ancestral trace of the Calaveras fault is a potential seismic source. UC Berkeley reports that there is potential for larger earthquakes in the San Francisco Bay Area due to the direct connection between the Hayward and Calaveras faults. The Calaveras Fault is located approximately 17 km west of LLNL, and recently active strands of the Greenville Fault Zone are located approximately 1.1 km northeast of the laboratory. Map showing the creeping section of the San Andreas Fault between Los Angeles and San Francisco. ML < 4) earthquakes on two 10-km segments of the Calaveras fault between Calaveras and Anderson reservoirs follows a simple linear pattern of elastic strain accumulation and release. Another large and active named segment is the Clark fault, which runs from near Hemet to just 15 km southwest of the shore of the Salton Sea. The Hayward Fault is the single most urbanized earthquake fault in the United States—in 1868 there were only 24,000 residents living in Alameda County; now there are more than 2.4 million people. Occurrence of small (3 ??? The quakes were all centered along the Calaveras fault system, which is located in the hills east of the San Francisco Bay Area. If the level of earthquake activity during the next few decades is similar to activity between 1836 and 1911, then the probability of a magnitude 7 earthquake in the next 30 years is about 75 percent. Take the Kestrel Trail to the Sierra Vista Trail north-east, then south to the Lower Calaveras Fault Trail with its great views of Alum Rock Canyon and Alum Rock Park. Each region is characterized by a constant rate of seismic slip as computed from earthquake magnitudes . an 1868 magnitude 7 earthquake. The most active fault in the region is the San Andreas Fault; however, all of the large faults in the San Francisco Bay region that display recent earthquake activity, or that display Quaternary offset, are part of the greater San Andreas Fault System. report feeling earthquake activity and tour interactive fault maps in SFGATE's . These faults are featured on the following maps: Mojave Fault Map Southern Fault Map Los Angeles Fault Map The Calaveras Fault (123 km; 76 miles) passes through or by Hollister, Gilroy, San Jose, Milpitas, Pleasanton, Dublin, San Ramon, and Danville. Credit: modified from Scott et al. Fault Activity Map of California. Submit one here. Geologic Setting: The Mendoza Trailhead provides access to a landscape evolving along the trace of the Calaveras Fault in the western foothills of the Diablo Range. We apply the technique to local earthquake data from the Calaveras Fault in northern California. The region may have entered a period of renewed earthquake activity following a lull after the 1906 San Francisco Earthquake. Specifically, a 1998 report prepared by Geomatrix found evidence of activity during the Late Quaternary on this fault system within the Walnut The U.S. Geological Survey says that an end-to-end rupture of the Hayward fault would cause an earthquake of magnitude 7.5. Measuring fault motion from a shifting landscape As of July 2015, the project is 67% complete. Earthquake properties were examined along two northern California fault segments, one is the Calaveras fault, another is a northern segment of the San Andreas fault. The Calaveras fault system stretches 131 km, from south of Hollister, northward, into the Danville-Walnut Creek area (Taylor, 1992). Adding the Calaveras to that would raise the magnitude to roughly the same size as the 1906 earthquake on the San Andreas fault. In the San Andreas and the Calaveras catalogs, where the return of the seismicity rate to the background level is well resolved, we find that the return to the background in the distance range of 1-2 rupture radii from a previous earthquake is preceded by a period during which the seismicity rate falls about 30% below the background rate . The Calaveras Fault has a MCE of 7.0 and also probably a 23 percent probability of occurrence in the next 30 years (Working Group on California Earthquake Probabilities, 1990). The fence line at Point Reyes, which still shows the shift from the quake almost 110 years ago, lies directly on the San Andreas Fault, the "host" of the . Problems with Internet Explorer? of the Calaveras Fault remains uncertain [WGCEP, 1999]. They also found that small earthquakes Geographic coordinates: -120.17428, 37.54117 (WGS84) Location accuracy: 100 (meters): Relative position: The Mount Gaines Mine is approximately 12 miles west-northwest of the town of Mariposa. Data from the USGS shows the quakes were widely felt by people in . (1980) developed for the San Andreas is applicable to the creeping Calaveras Fault . South of the Bay Area the Hayward and Calaveras merge into the San Andreas. The San Andreas Fault, the largest active fault in California, was the source of the San Francisco 1906 magnitude 7.9 earthquake and the 1989 magnitude 7.1 (Loma Prieta) earthquake and is 16.9 kilometers from the SVRTC. The USGS continuously monitors their activity. Because the landscape has not been modified by human activity, it still preserves many of the natural landscape features associated with active strike-slip fault zones. Past the Historic Ranch House and Penitencia Creek, there is a rapid elevation gain along the Lower Calaveras Fault Trail, through gray pine habitat, and dramatic views of Alum . The Calaveras fault is a major offshoot of the San Andreas fault in Northern California. Both occurred on Oppenheimer et al.'s (1990) Zone V "stuck patch" on the central Calaveras fault, providing new support for their model of Calaveras fault earthquake activity. Other nearby faults includes Greenville (9.5 miles east of the project site), and San Andreas (28 The Calaveras Fault, where Tuesday's earthquake originated, is not far from the Hayward Fault. In the San Andreas and the Calaveras catalogs, where the The Calaveras and Hayward faults extend up the east side of the San Francisco Bay. volcanic activity on Hawaii is due to _____ a.mid-ocean ridge b.subduction zone . The San Andreas fault is the . and of these, only a few are associated with historic earthquake activity. [3] Oppenheimer et al. The San Andreas fault ­ the world's most closely watched earthquake zone ­ will be the subject of a special three-day conference at Stanford and the United States Geological Survey (USGS) next week. The San Andreas Fault and 6 other significant fault zones are present in the Bay Area: the Calaveras, Concord-Green Valley, Greenville, Hayward, Rodgers Creek, and San Gregorio Faults. Significant seismic activity can be explained by repetitive failure of the same fault areas in nearly identical earthquakes. Damages from such a quake might reach $300 billion. Lower Calaveras Fault Trail is a 3 mile moderately popular blue singletrack trail located near San Jose California. Experts have previously warned that any . All of these are ``right-lateral strike-slip faults'', which means that the motion is predominantly horizontal, with the land on the West side of the fault moving North. Geologic evidence demonstrates Holocene activity along strands of the Las Positas Fault Zone that lie about 90 m southeast of LLNL at their point of closest approach. In addition to rupture in moderate earthquakes, this section of the Calaveras Fault has been extraordinarily active in microearthquake activity. Fault Activity Map of California. . It is part of the tectonic boundary between the Pacific and North American plates. The faults shown here are represented by simple lines which do not convey how complicated they can be. a.the calaveras fault b.the hayward fault c.the san andreas fault d.both B and C e.all of A to C. . Hundreds of homes and other structures are built along the fault trace, and mass transit corridors, major freeways, and many roadways cross it at . M 5.6 Calaveras fault . According to the CGS, the nearest active faults are the Calaveras fault (2.25 miles southeast of the project site), Concord fault (4.75 miles northeast of the project site), and Hayward fault (8.5 miles southwest of the project site). The pipeline and has been designed to withstand the force of any seismic activity from the nearby Calaveras Fault. The largest historical quake on the Calaveras fault was a magnitude 6.6 temblor in 1911, according to Ross Stein, chief executive of Temblor.net and a former USGS research geophysicist. [1990] studied microearthquake activity of the Calaveras Fault in great detail. It splits from the San Andreas Fault around Hollister and produced the Calaveras Valley. South of the Bay Area the Hayward and Calaveras merge into the San Andreas. Past the Historic Ranch House and Penitencia Creek, there is a rapid elevation gain along the Lower Calaveras Fault Trail, through gray pine habitat, and dramatic views of Alum . The faults shown here are represented by simple lines which do not convey how complicated they can be. The quake happened at a depth of around 4 miles (6.5 km) on the infamous San Andreas Fault, close to a region where the Calaveras Fault branches off. date, our crews have installed 500 feet of the new steel pipe, welded the joints, References Looking at patterns of activity in the San Francisco Bay Area since 1948, we find an increase of activity on the Calaveras fault near San Jose beginning in the 1980s which, if our model is relevant, would forecast a large earthquake in that region. 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