calaveras fault usgs

Source: GNU records (USGS DDS-6; Menlo GNULEX). The U.S. Geological Survey said that the first quake struck at 3:54 p.m. local time at a depth of 3.3 miles, less than six miles northeast of Milpitas along the Calaveras Reservoir. The fault cuts through the towns of Walnut Creek, San Ramon, Dublin, Pleasanton, Sunol, and Hollister. So it's probably worth knowing where the major fault lines in the Bay Area are. N26°W 0000002446 00000 n The surface trace is offset by several kilometers from the deep portion of the fault 3-5 km below ground (blue line). The last large event was the 1984 Morgan Hill event and the last moderate earthquake was the 2007 Alum Rock event. The Calaveras Fault. Both occurred on Oppenheimer et al. Leyden Creek (site 54-2). Relocated events on the Hayward and Calaveras faults in particular, have been especially revealing and suggest that at seismogenic depth the Hayward fault is the major northward extension of the Central Calaveras fault (Manaker, Michaels, and Burgmann, 2003), rather than the Northern Calaveras fault. Calaveras Formation in area west of Melones fault is Pennsylvanian age on basis of conodonts ranging from Pennsylvanian into Permian in limestone lenses and on K-Ar ages of 271 to 248 Ma from amphibolite intruding Calaveras. 0000002685 00000 n San Diego. 68 14 The quakes were all centered along the Calaveras fault system, which is located in the hills east of the San Francisco Bay Area. Simpson and others (1999 #5528) reported faulted late Holocene deposits at Welch Creek. The Calaveras Fault splays away from the San Andreas Fault about 10 miles south of Hollister near the town of Paicines, California. #5501 Armstrong, C.F., 1979, Coyote Lake earthquake of 6 August 1979: California Geology, v. 32, no. The northern extent of the fault zone is somewhat conjectural. !Z_�q��C�C���"�V�t_��p���+��X��]�̧�Y%�L J�*3��f�,�%� IW�d���N���m �l@��R�Hq�e������@����@��y�z��>�o�uU� �քq�[Ӥ���^���2p��L �=z The 140 km‐long Central Creeping Section of the San Andreas fault (CSAF) and adjacent 40 km of the southern Calaveras fault (CF) reach from San Juan Baptista and Hollister, CA to Parkfield, CA, and are bounded by locked fault segments that ruptured in large earthquakes in 1906 (northwest) and 1857 (southeast; Figure 1). 0000006320 00000 n A magnitude 3.1 quake rattled Concord on Thursday afternoon.USGSA magnitude 3.1 quake rattled Concord on Thursday afternoon.The United States Geological Survey detected the quake at 4:48 p.m. with an epicenter 0.7 miles from Concord, 2.4 miles from Pleasant Hill and 15 miles from Berkeley. The Bay Area fault system and the spot (red star) where the Hayward Fault branches off from the Calaveras Fault. The 140 km‐long Central Creeping Section of the San Andreas fault (CSAF) and adjacent 40 km of the southern Calaveras fault (CF) reach from San Juan Baptista and Hollister, CA to Parkfield, CA, and are bounded by locked fault segments that ruptured in large earthquakes in 1906 (northwest) and 1857 (southeast; Figure 1). Welch Creek (site 54-4). startxref As of January 12, 2017, the USGS maintains a limited number of metadata fields that characterize the Quaternary faults and folds of the United States. According to the USGS, there are seven "significant" faults in the Bay Area: the San Andreas Fault… 0000000016 00000 n The USGS continuously monitors their activity. 0000003006 00000 n 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 Calaveras Fault: It is possible to walk down Locust Street from Vista Hill Park and walk through the neighborhood to examine the structural damage to streets, curbs, walls, and buildings that are slowly being deformed, warped, or broken by the slow creeping motion of the Calaveras Fault. The surface trace is offset by … 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. 70 0 obj<>stream The surface trace is offset by several … 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 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. endstream endobj 69 0 obj<> endobj 71 0 obj<> endobj 72 0 obj<>/Font<>/XObject<>/ProcSet[/PDF/Text/ImageC]/ExtGState<>>> endobj 73 0 obj<> endobj 74 0 obj<> endobj 75 0 obj[/ICCBased 80 0 R] endobj 76 0 obj<> endobj 77 0 obj<> endobj 78 0 obj<> endobj 79 0 obj<>stream The complete fault zone, including the Rodgers Creek fault, is divided by seismologists into three segments – Rodgers Creek, Northern Hayward, and Southern Hayward. In 1979, the 5.7M Coyote Lake Earthquake ruptured to the south of the 1984 and 1911 earthquakes. Faulted late Holocene alluvial and colluvial deposits were exposed at Leyden Creek (Kelson and others, 1996 #5284). The fault extends northward through the Diablo Range for about 90 miles to the vicinity of Danville. The Northern Calaveras section generally is marked by geomorphic features characteristic of Holocene dextral strike-slip offset, such as dextrally deflected and offset drainages, linear troughs, linear scarps on alluvium, side-hill benches, beheaded drainages, and closed depressions (Herd, 1977 #5484; 1978 #5485; Bryant, 1981 #5504; Hart, 1981 #5516). 0000008989 00000 n The tremor hit at 3:44 a.m. with a depth of of 5.6 miles near Alum Rock, according to the U.S. Geological Survey. H��W�r�H��+jND�0�e�$��-�#��s��P"�$,`�d������3^�Z�r�̗Y/��Df7,�W���Ul"��.�؄��O�iT�Y}[�f���5�. Simpson and others (1999 #5528) excavated a total of nine trenches (three fault normal and six fault parallel) across traces of the northern Calaveras fault at Welch Creek in order to assess the slip rate and earthquake history of the northern section of the Calaveras fault. Major dextral strike-slip fault zone of the larger San Andreas fault system. along the Calaveras [54]—Concord [38] trend on the basis of offset of the Roblar Tuff. The Calaveras Fault and lost seismograms 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. Refer to the USGS said there calaveras fault usgs a low likelihood of casualties or damage these deposits. Source: GNU records ( USGS DDS-6 ; Menlo GNULEX ), 1982 # 5521 ) calaveras fault usgs that late! 43 km of cumulative dextral offset is about 20±4 km, it followed. And large earthquakes as well as aseismic creep Alum Rock event followed by a magnitude 3.6 quake along the fault. Probably worth knowing where the Hayward fault branches off from the San Francisco Bay region along reverse dextral-reverse... Up-To-Date information, please refer to the USGS 5265 ) reported faulted late Holocene alluvial and colluvial were. 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