The white lines indicate faults recognized by the USGS. The fault cuts through the towns of Walnut Creek, San Ramon, Dublin, Pleasanton, Sunol, and Hollister. 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. Because of this, “the static stress change at depth must have been minimal.” This suggests that excavation during dam construction is not likely to be the cause of this swarm. By Melissa L. Weber, science writer (@Melwriter), Citation: Weber, M., 2020, Earthquake swarm rattles ground near new Calaveras Dam, Temblor, http://doi.org/10.32858/temblor.124, Aerial view of the Calaveras Reservoir, looking to the east. Over 70 small quakes have struck beneath Observation Hill since mid-August. Nevertheless, should this swarm penetrate the Calaveras Fault, the chances of a larger shock will climb, and the monitoring vigilance will intensify. Two 3.4 magnitude earthquakes struck hours apart in the same area in Northern California on Sunday, according to officials. Most researchers believe that strain accumulated along the Calaveras south of Calaveras Reservoir is transferred to the Hayward fault on the Mission Hills fault (Oppenheimer and Macgregor, 1991). Why faults start and stop creeping is a mystery, but most swarms and creep events do not cascade into larger earthquakes. The largest earthquake within 30 miles of Calaveras County, CA was a 3.3 Magnitude in 2017.View the probability of a major earthquake within the next 50 years in Calaveras County, CA.View the number of earthquake incidents in Calaveras County, CA by year that are more than 2.5 Magnitude. The earthquake faults in California, including the Hayward, the Calaveras and the San Andreas faults. He noted that there have been several large earthquakes linked to construction of dams and reservoirs in India and Egypt. It is unclear on which faults these quakes are occurring, but this activity is a sign that the area is anything but quiet. Final Technical Report to US Geological Survey, National Earthquake Hazards Reduction Program. But by the time these professors began to die in mid-century, their lifelong seismogram archives were thrown out. Details of the 3D fault geometry at stepovers and bends—particularly in urban settings—are often lacking, limiting efforts to constrain hazard calculations in these areas. When full, it can store 96,850 acre-feet, or 31 billion gallons of water. During the past week, 75 quakes have rattled the beautiful town of Danville, scene of the beloved Robin Williams movie, “Mrs. We use specialized high … This is a relief to the 27 million residents who rely on the Calaveras Reservoir. That is enough to fill Levi’s Stadium from bottom to top four times, according to SFPUC. The largest historical quake on the Calaveras Fault was a M=6.6 event in 1911 (Doser, 2009), but far too … But “they always cause discussion and debate,” said Burgmann. Along sections of the Central San Andreas and southern Calaveras faults in California, we map rates and patterns of fault creep over 150 km by comparing two older airborne … The reservoir is located less than 20 miles from where Tesla is based in Fremont, California, and sits on the Calaveras fault system. The first quake was reported at 6:58 a.m. USSD Dams and Levees Bulletin of the United States Society on Dams Summer 2019 Issue No. The slip rate along the fault … Doubtfire.” The quakes are occurring at a depth of 5-7 km (3-4 mi) on a heretofore unmapped fault or set of faults, and exhibit a diversity of mechanisms, some similar to the ‘right-lateral’ (whichever side you are on, the other side moves to the right) Calaveras Fault, and others perhaps related to the ‘blind thrust fault’ that has jacked up Mount Diablo. At the same time, the North American Plateis moving southwestward relative to the Earth's core, but southeastward relative to the Pacific Plate, due to the latter's much faste… 1996). The Calaveras Fault and lost seismograms . Witter, R. C., Kelson, K. I., Barron, A. D., & Sundermann, S. T. (2003). The Calaveras and Hayward faults extend up the east side of the San Francisco Bay. Soc. The Calaveras fault system runs over 80 miles, from south of Hollister into the Danville-Walnut Creek area. The white lines … 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 … These shallow repeaters align well … California Geological Survey The quake was reported at 10:35 a.m. and was centered east of Alum Rock Park. This article has been updated to reflect recent earthquakes in the swarm. Only one 1911 seismogram from the U.S. survived, from the University of St. Louis, which was saved by Prof. John Ebel, former director of the Weston Observatory of Boston College. Although most of the quakes in this week’s swarm are 3-5 km (2-3 mi) from the Calaveras Fault, the swarm has been migrating toward the Calaveras over the past few days. “I think the swarm is just a good reminder of seismic hazard that exists along the fault.”. It struck along the Calaveras Fault and had a depth of 7.4 kilometers, according to the USGS. Hayward-Calaveras fault zone (HCFZ), characterization of the creep rates along the faults with a high spatial resolution is necessary. The Calaveras reservoir provides drinking water storage for residents throughout California, according to the San Francisco Public Utilities Commission (SFPUC), who manages the reservoir. Neither is construction of the dam itself, because excavated material was not removed from the site, but instead only shifted around over a small area, Burgmann said. Amer., 99, 1746–1759, doi: 10.1785/0120080305 The Hayward Fault splinters from the Calaveras Fault, which itself is an offshoot of the If you live or work in the East Bay, this is the time to ask yourself if you are quake ready. The largest earthquake within 30 miles of Calaveras County, CA was a 3.3 Magnitude in 2017. At that time, most U.S. seismic observatories were run by scientist priests at Jesuit universities. It's a kind of "Faults For Dummies!" With a slip rate of about 15 mm/yr (0.6 in/yr) and a length of about 100 km (60 mi), the Calaveras is highly active and certainly capable of a M7+ earthquake. As a precaution, the water levels in the reservoir were lowered to about 40% capacity in an attempt to mitigate downstream hazard should a major earthquake compromise the dam. “After the landslides were removed, we found additional, smaller faults that had not been recognized during the original design studies for the new dam” said Rick Harlan, an engineering geologist who worked for the SFPUC’s construction management team during the dam replacement project. The SFPUC’s Completion Fact Sheet for the recently completed Calaveras Dam Replacement Project (CDRP) indicates that the fault runs only about 1,000 feet (300 meters) from the new dam (SFPUC, 2019). The San Andreas fault system is to the west, the Garlock fault is to the south and the faults of the Sierra Nevada are to the east. The San Andreas Fault is a continental transform fault that extends roughly 1,200 kilometers (750 mi) through California. Construction on the new Calaveras Dam exposed faults not previously mapped. In Hollister the Calaveras Fault is displaying aseismic motion—one side of the fault is slipping past the other side of … Historical storage records suggest the recent re-filling of Calaveras reservoir is also not a likely culprit, since similar reservoir fluctuations have occurred in the past without triggering pulses of seismicity in that area. Credit: Rick Harlan (used with permission of SFPUC). future moderate earthquakes on the Calaveras Fault. A magnitude 3.7 earthquake was reported Tuesday morning 2 miles from Morgan Hill, according to the U.S. Geological Survey. The initial earthquake The HCFZ considered here encompasses the HF, the northern CF, and the central CF from the junction with the northern CF to Gilroy (Figure 1). UC Berkeley seismologists have proven that the Hayward Fault is essentially a branch of the Calaveras Fault that runs east of San Jose, which means that both could rupture together, resulting in a significantly more destructive earthquake than previously thought. Lian Xue, Roland Bürgmann , David R. Shelly, Christopher W. Johnson, Taka’aki Taira (2018), Kinematics of the 2015 San Ramon, California earthquake swarm: Implications for fault zone structure and driving mechanisms, in press, Earth and Planetary Science Letters. The Calaveras fault produced the M6.2 Morgan Hill Earthquake in 1984. The Bay Area fault system and the spot (red star) where the Hayward Fault branches off from the Calaveras Fault. Within a minute, it was followed by a 3.6-magnitude quake along the Calaveras Fault in Santa Clara County. Risk … It forms the tectonic boundary between the Pacific Plate and the North American Plate, and its motion is right-lateral strike-slip (horizontal). On 6 August 1979, a magnitude 5.7 earthquake occurred along the Calaveras fault zone in the Coyote Lake area of central California. The San Andreas fault system is the … More than 35 quakes ranging as high as a magnitude-3.5 have been recorded by the U.S. Geological Survey since September 27. Holocene slip rate and earthquake recurrence of the northern Calaveras fault at Leyden Creek, northern California. There are several reasons why these earthquakes may be occurring here. Along some active faults, deformation and offset occur continuously even in the absence of large earthquakes; this is referred to as fault creep which generally proceeds at rates of millimeters to tens of millimeters per year. 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