The San Andreas Fault is a continental transform fault that extends roughly 1,200 kilometers (750 mi) through California. These shallow repeaters align well … “As I understand it, the excavated material [at Calaveras] was mostly put back into the nearby new dam embankment,” he said. window.dojoRequire(["mojo/signup-forms/Loader"], function(L) { L.start({"baseUrl":"mc.us11.list-manage.com","uuid":"b739709487a9092b101e207ed","lid":"197a65374d","uniqueMethods":true}) }), PUSH (Probabilistic Uniform Seismic Hazard), Construction on a new earth-and-rock-fill dam, linked to construction of dams and reservoirs, When preparing for earthquakes, don’t forget the small ones, American Geophysical Union meeting brings student research to light, Surface deformation observed in moderate Greek quake. It forms the tectonic boundary between the Pacific Plate and the North American Plate, and its motion is right-lateral strike-slip (horizontal). This is a relief to the 27 million residents who rely on the Calaveras Reservoir. The first quake was reported at 6:58 a.m. The largest historical quake on the Calaveras Fault was a M=6.6 event in 1911 (Doser, 2009), but far too … Fault connectivity defines the maximum earthquake rupture length, and the three-dimensional (3D) geometry of faults affects the dynamics of fault rupture, slip, and ground motion (11–15). The similarity of seismograms recorded by two seismic stations demonstrate that the 31 October 2007 moment magnitude M5.4 Alum Rock earthquake is a repeat of a 1955 M L 5.5 earthquake. It passes through parts of Berkeley, Oakland, Hayward and Fremont before branching into a set of surface faults that connect it to the central part of the Calaveras Fault, according to the USGS. 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. The dam design was modified to ensure it could accommodate small amounts of movement on these secondary faults, which might be triggered by a large local earthquake on the main Calaveras fault nearby, according to a United States Society on Dams report. Monitoring Velocity Variations in the Crust Using Earthquake Doublets: An Application to the Calaveras Fault, California July 1984 Journal of Geophysical Research Atmospheres 89:5719-5731 Although the area has seen little significant seismic activity over the past 100 years, paleoseismic studies at Leyden Creek about one mile (2 kilometers) north of the dam indicate that this section of the northern Calaveras fault has generated a number of ground rupturing earthquakes of possibly up to around magnitude-7.0 over the last 2,500 years (Kelson et al. The earthquake faults in California, including the Hayward, the Calaveras and the San Andreas faults. Construction on the new Calaveras Dam was completed last year. In Hollister the Calaveras Fault is displaying aseismic motion—one side of the fault is slipping past the other side of … However, the rms residuals for P-wave arrivals at many of the network stations were as high as 0.25 sec due to the laterally heterogeneous structure of this area which deviates from the … Within a minute, it was followed by a magnitude 3.6 quake along the Calaveras Fault in Santa Clara County. The north-northwest trending Calaveras Fault makes a westward bend or stepover under the northern end of the reservoir, crossing from the east bank of the reservoir south of the dam to the west side of Observation Hill which forms the left (west) abutment of the dam, according to a technical report on the Calaveras Fault. Doser, Diane I., Kim B. Olsen, Fred F. Pollitz, Ross S. Stein, and Shinji Toda (2009), The 1911 M∼6.6 Calaveras earthquake: Source parameters and the role of static, viscoelastic, and dynamic Coulomb stress changes imparted by the 1906 San Francisco earthquake, Bull.Seismol. The northern segment of the Calaveras Fault is virtually locked and this segment of the fault creeps at a rate between 2 and 3 mm/yr. As far as dam safety, the SFPUC confirmed that there were “no impacts at all to the dam or its surrounding facilities” following any earthquakes in this swarm. Earthquake scientists are far more worried about the potential violence of a more northern stretch of the Calaveras Fault, between the towns of Danville and San Ramon. The quakes were all centered along the Calaveras fault system, which is located in the hills east of the San Francisco Bay Area. Risk … It is also being subducted far to the northwest into the Aleutian Trench. 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