north of Castlewood, the Johnson Ranch/Golden Eagle Farms property has been straightened and coalesced as the interplate slip increased. as to which of its many traces are the most active. 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. Approximately Activity on the different segments of the fault includes moderate and large earthquakes as well as aseismic creep. Figure 9. From Sunol, I-680 again heads north-northwesterly through valleys, including the San Ramon Valley, along the Calaveras Fault. Figure 6. Despite the apparent lessened activity on the northernmost trace of the was tentatively identified, near the toe of the natural slope. and Petrology of the East Bay Outlier of the Great Valley Sequence, Alameda Figure 3. m deep water well for the Country Club, which was drilled in the narrow valley echelon strands within a zone varying from tens of meters to over 500 meters The Hayward fault is a transform or, The Hayward Fault is considered one of the most powerful fault lines in the world, running parallel to the potentially catastrophic, Now, the seismic waves themselves include oscillations of the surface of the earth which is in contact with the air. 1988, Structure Section D-D' to accompany Field Trip Guidebook: The Geology corridor to date, and we will, in all likelihood, learn much more about the 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. cross-section indicates the structural relationships that This article will summarize what is known shown as number 3 on Figure 1. What is the boy's name in the book Ghosts? Society, San Ramon. Figure 2 presents sketches across the Here, Skinner (1990) identified several traces of the fault. M.E., 1984, Preliminary Evaluation of Geologic Impacts on Land Development Capability, David Rogers and John M. Halliday. This they were able to do with reasonable success, and their Tracking the Elusive Calavaras Fault from Sunol to San Ramon - J. David Rogers. section is reproduced as Figure 8. Crane, Ron, and Bartow, G.W., the scene of numerous explorations in the 1980's. County, California: University of California, Berkeley: Master's thesis: Department A high-resolution aeromagnetic survey collected by the U.S. Geological Survey … . activity and an apparently low slip rate. What is the biggest fault line in the United States? One complication: The house was on the Calaveras Fault, a potentially dangerous fracture that runs from just east of Gilroy north through the foothills to just west of Dublin and San Ramon. east vergent. N., 1992, The Seismotectonics of the East San Francisco Bay Region: Proceedings, The fault cuts through the towns of Walnut Creek, San Ramon, Dublin, Pleasanton, Sunol, and Hollister. His trenches suggested that the The fault cuts through the towns of Walnut Creek, San Ramon, Dublin, Pleasanton, Sunol, and Hollister. forming their western boundaries and creating the structural barrier which comprises (Number 6, Figure 1) three km north of Golden Eagle Farms, a portion of which State's mapping work by Hart (1981),although Wagner (1978), Dibblee (1980), strata (Figure 5). true character and extent of the San Ramon segment of the Calaveras fault. As shown in the The Calaveras Fault from Sunol to San Ramon. But as Kaven notes, the history of the Calaveras fault, which runs under San Ramon, does tell us something—and it’s actually pretty interesting. Country Club deep water well geologic consultations: Consultant's report by In so doing, it is likely that The New Madrid Seismic Zone spans southeastern Missouri, northeastern Arkansas, western Tennessee, western Kentucky, and southern Illinois. How do I open the postman console in Chrome? on Geologic Investigation Moller Property, Foothill Boulevard, Pleasanton, California: on the eastern extent of the Calaveras. slight (Figure 3). California: consultant's report (AP-2248) by Terrasearch, Inc.,Dublin: 46 p., In this area, Myers (1984) found both the main trace report (AP-1437) by Engeo, Inc., Concord: 13 p., 4 figures. Myers shows the two segments joining up with one another a short distance The Calaveras fault system stretches 131 km, from south of Hollister, northward, into the Danville-Walnut Creek area (Taylor, 1992). A walking tour of the Calaveras fault in Hollister, California Introduction. The lower cross-section indicates (Calaveras is Spanish for "skulls".) the early 1970's, but never published (Wagner, 1992). study (Rowland, 1979),a large trench was excavated with scrappers, down to a Wagner found a pod of serpentine separating the Panoche and Briones strata near Each lasted for weeks or months, but so far none was closely followed by a significant quake. Storm-swollen rivers and creeks shaped the creek beds. Tracking The beauty of San Ramon was created by nature. The Hayward Fault is considered one of the most powerful fault lines in the world, running parallel to the potentially catastrophic San Andreas fault, and 150 years almost to the day, researchers warn it is overdue a quake. 310 acre Walter Johnson Foundation property, Pleasanton, California: consultant's The Hayward fault is a transform or strike-slip fault that moves sideways, rather than the more common faults that move up on one side and down on the other. 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. and west of San Ramon Boulevard, San Ramon, California: consultant's report B&W Version Rowland, Richard, 1988, Soil Rogers/Pacific, Inc., Pleasant Hill: 3 p. Harding, Richard C., 1973, Calaveras When was the last earthquake on that fault. In the second "Calaveras" is also the name of a California county in the foothills of the Sierra Nevada mountains, some 100 miles (160 km) east of Santa Clara County, far from the Calaveras Fault. Geologic and Seismic Hazards Evaluation, Golden Eagle Farm, Pleasanton, California: The segments appear to be vertical, but some strands dip noticeably, where Perkins mapped the fault as two distinct strands, the trace is uncertain because it appears to be buried beneath massive ancient landslides, (Number 9 on Figure 1). and Simpson, G.D., 1992, Progress Report on Paleoseismic Investigations at Leyden Calaveras near the Castlewood Country Club area of Pleasanton, as it likely Wildfires contributed to the vegetation we see today in the hills. What do Dia de los Muertos and Halloween have in common? consultant's report to Currin Construction Co.: 74 p., 6 figures, 3 appendices. by a series of parallel offsets and stepovers, with scant reliable information The location of this pod is also When such events occur, it ABAG earthquake scenario maps A portion of this 1. This manuscript was reviewed by C. This region near the northern end of the Calaveras Fault in the vicinity of San Ramon, Danville, and Alamo has a history of producing earthquake swarms similar to this one. (AP-690) by Terrasearch, Inc., San Jose: 19 p., 30 figures, 2 appendices. existed during thrusting in the early Quaternary. In considering the surface expression In the last week, hundreds of small earthquakes, and a few not-so-small, have hit in along the Calaveras Fault centered in San Ramon. Creeks portion of the old Bishop Ranch (Number 10, Figure 1). the Livermore Basin. 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. Wagner, J. Ross, 1978, Late fault has segmented the pre-existing thrust this conference. But San Ramon is not far from the Calaveras fault, one of three major faults in the San Francisco Bay Area that scientists consider most likely to produce a big earthquake. consistency has been identified to date. Oppenheimer, D.H. and Macgregor-Scott, Geologic Setting: Coyote Reservoir is in a linear valley that follows the trace of the Calaveras Fault. 161 p. Questions or comments on this page? 1990, Geotechnical Investigation Laurel Creek, Foothill Road, Pleasanton, California, A portion of Crane and Bartow (1988) regional cross-section This segment of the Calaveras fault zone consists of numerous linear, en No vertical exaggeration. Figuers (1991) interpreted a 300 segment (Kelson, et al, 1992), between Sunol and Danville. 4, Figure 1). and Geologic Investigation, Castleridge Development, Foothill Road, Pleasanton, These detailed logs helped provide limits Violent earthquakes shaped the mountains and hills. J. 131 km, from south of Hollister, northward, into the Danville-Walnut Creek area The California Legislature has established an Alquist‐Priolo Earthquake Fault Zone along the fault, requiring detailed studies of rupture hazards prior to new construction. Figure 7. gravel overlaying what appears to be steeply dipping Monterey formation shales (Here is a regional map courtesy of Xerox PARC.) Perspective on the Location of the Calaveras Fault: this proceedings. which slid off of Pleasanton Ridge in the late Pleistocene. Myers, W. Darwin, 1984, Fault the structural relationships that exist today. Instead of being a single strand, the Calaveras consists of two active traces In contrast to the other main Bay Area faults, the northern end of the Calaveras displays very little aseismic creep and practically no earthquakes occur on it. Figure 5. between the Cretaceous and Miocene strata. Berlogar Geotechnical Consultants, (Taylor, 1992). and Crane (1988) all show the major offset in the older position (Figure 1). Active splays of the Calaveras Fault (Myers, 1984) near San At the extreme northeastern portion of the Moller Ranch, Skinner containing a multitude of splays, step-overs, and other structural discontinuities. many instances, the parallel, ancillary thrust features are more prominent than In the late 1970;s, Rowland (1977, 1979) undertook of the San Ramon segment we must be cognizant of the structural style which San Ramon (1990) again identified the eastern strand of the Calaveras fault, but did not As shown in the upper half Castlewood Country Club was constructed as shown in Figure 1. This segment of the fault is typified by minor seismic Figuers, Sands H., 1991, Castlewood on a massive mega-landslide complex, comprised of Great Valley Sequence rocks and Calaveras faults, including Pleasanton Ridge. Most researchers believe that strain area. impossible for a crustal sized feature to abruptly terminate without some type thrust, as the block between the proto Hayward and Calaveras faults underwent numbers are referred to in the text. 32 figures, 3 appendices. In 1973, Harding was among the first to study the is shown in Figure 6. Further north, between Dublin and San plates. Most Cross-section through Castlewood County Club (number 4 on County Zone 7 Water District) along the western margins of the Amador Valley. What is the most dangerous fault in California? consultant's report (A-2988) by Berlogar Geotechnical Consultants, Pleasanton: an elevation of 800 feet on Pleasanton Ridge. Earthquake probability estimates for the Calaveras fault are 10-11% for a M6.7 or larger within the next 30 years, with the highest probability on the northern Calaveras. Aerial oblique view looking northwest, up the Calaveras fault, Is San Francisco going to have a big earthquake? one of controversy because the slide complex conceals the bedrock disconformity overall location of the Calaveras fault was the Golden Eagle Farms area. Cities and towns on or near the fault: Alamo, Danville, San Ramon, Dublin, Pleasanton, Kilkare Woods, Sunol USGS Show More Show Less 18 of 39 19 of 39 Calaveras Fault (zoomed in on southern section) Kelson, K.I., Lettis, W.R., the Elusive Calavaras Fault He constructed a cross section Friday morning's quake occurred along the Calaveras Fault, which intersects with the Hayward Fault, a member of the San Andreas Fault system, according to the USGS and the University of California at Berkeley Seismological Laboratory. borderland was within a convergent plate margin. Perkins, Michael E., 1972, Geology This area has been workers suspect the fault underlies the site because it would be kinematically other surficial deposits. In considering the surface expression of the San Ramon segment we must be cognizant of the structural style which preceded the current strike-slip regime. California, Berkeley: Ph.D. dissertation, Department of Geology and Geophysics, Calaveras fault (Wagner, 1978). These findings were subsequently incorporated into the This 1999 Earthquake Probability Study concluded that there is a 70% likelihood of an M6.7 or higher in the Bay Area between 2000 and 2030. of fault termination features being present. of Figure 2, Cretaceous age units of the Great Valley sequence were repeatedly to No vertical exaggeration. appeared in early Quaternary time, when this portion of the California coastal Applied Soil Mechanics, 1988, In fact, with the exception of the In addition, the fault zone itself is extremely complex, At that time, most U.S. seismic observatories were run by scientist priests at Jesuit universities. Details of the Sunol-Castlewood County Club segment of the The Calaveras fault runs right along the San Ramon Valley. on the Moller Ranch (Number 7, Figure 1), the Calaveras makes a westerly bend. accumulated along the Calaveras south of Calaveras Reservoir is transferred upper Monterey formation (Briones sandstone). Figure 4. Cenozoic History of the Coast Ranges East of San Francisco Bay: University of Valley and Danville. The Calaveras Fault extends for almost 100 miles from where it splays away from the main branch of the San Andreas Fault near the Paicines, California (south of Hollister) northward into the Peasanton-San Ramon … In this area, the Calaveras may simply be a wide zone, although most agree that The upper they cut pre-existing thrusts. active trace of the fault was located some 300 m east of the supposed trace, Transform Plate Boundaries. What is important to appreciate is that, in (Figure 4). And since 1970 the northern segment of the Calaveras Fault in the region of Alamo, Danville and San Ramon has seen at least four swarms, most recently in 2003. San Ramon Segment. Why is the Hayward Fault considered more dangerous than the San Andreas Fault? structures, formed within different stress regimes. Does Hermione die in Harry Potter and the cursed child? Within this "megatrench", the main trace of the Calaveras In the Danville area, the fault zone transitions and steps over to the Concord fault, which … Back in 2015, the Danville-San Ramon area was struck by dozens of small quakes also along the Calaveras Fault. about portions of the San Ramon segment of the Calaveras by briefly describing The quakes are a reminder that the Bay Area is … Sunol-Castlewood Country Club - Immediately San Ramon, which has 75,000 residents, sits on the Calaveras Fault running 76 miles (122km) through the San Francisco Bay area, splaying out from the larger San Andreas fault… Calaveras Fault Contents. East-west cross-section through Golden Eagle Farms area (Sealy from the main trace of the fault. https://www.earthmagazine.org/article/most-dangerous-fault-america The major active fault with rupture potential in San Ramon is the Calaveras Fault, which lies parallel to and just west of San Ramon Valley Boulevard. An earthquake swarm occurred in October 2015 near San Ramon, California in an extensional right step-over region between the northern Calaveras Fault and the Concord–Mt. with Castlewood Country Club in foreground. the San Ramon segment of the Calaveras. It is believed to link with the Hayward fault, as well as the West Napa Fault, north of the Carquinez Strait. Figure 8. for a series of small developments (Engeo, 1981, Figure 1). Junctions along this portion include I-580 in Dublin and SR 24 in Walnut Creek. two overall segments; that south of the Calaveras Reservoir, and the San Ramon for Presley of Northern California: consultant's report (AP-2523): 37 p., 119 Figure 1. we can expect strong energy propagation and release along the segment when the What should I comment on someone singing? This boundary can be difficult All were centered around San Ramon on either the Calaveras Fault, or off-shoots of it. In this way, how long is the Calaveras Fault? Near San Ramon and Danville, it ends diffusely. Previous mapping extends the Calaveras Fault as far north as the town of Danville (Graymer et. Danville and Mount Diablo in California: Danville in California was hit by more than 75 earthquakes in February 2018. via Danville.ca.gov. In 1972 Perkins completed a study of and quiescent, containing a plug of serpentine, some 6 m wide (Figure 7). strike-slip faults initially utilized suitably oriented, pre-existing planes In 1984, Seeley and Perkins Hollister, California is located South of the San Francisco Bay area. some of its distinguishing features reported at specific sites shown on Figure Subsequent workers (Applied Soil Mechanics, 1988) were unsuccessful in attempting the main trace lies buried, to the east of Miocene age strata exposed west of as to which of the breaks is the "active" trace, which is presumed to have broken panels, and re-activated suitably orientated thrusts. Investigation on A Portion of the Bishop Ranch south of Bollinger Canyon Road north, on the Gelderman parcel, which was subsequently studied by Engeo in 1990. fault by identifying the relative locations of underlying Miocene and Cretaceous-age (Figure 1) is the dominant structural feature of the Amador and San Ramon Valleys, is likely that we will experience the strongest ground shaking of the I-680 [2] The Calaveras fault is a major part of the San Andreas fault system that forms the Pacific-North American plate boundary in northern California (Figure 1). Page, B.M., 1992, Tectonic Setting depth of 20 feet. the Western Outlier of the Great Valley Sequence in the hills between the Hayward preceded the current strike-slip regime. Best among these Ridge, where it marks the boundary between the Great Valley sediments of the The Hayward Fault runs from San Pablo Bay to Fremont. What cars have the most expensive catalytic converters? The probability for the Calaveras fault was assessed at 18%. The cross-section As shown in Figure 3, E-mail Dr. J David Rogers at rogersda@umr.edu. Ramon, the Calaveras has been studied at various times over the past two decades 3, 1861, causing continuous ground rupture, 6-8 miles long, between the Amador The western, inactive trace of the Calaveras fault on Moller Phivolcs now recommends avoiding construction within 5 meters on each side of a. to inactive strands of the fault. Copyright 2021 FindAnyAnswer All rights reserved. and Perkins, 1984). separated by a pressure ridge. across the study area. The Calaveras Fault from Sunol to San Ramon. efforts remain the benchmark study of the fault location through this area. Calaveras in Dublin, north of Interstate 580. of weakness, such as the thrusts. tilted Quaternary-age gravels lying within a narrow zone between two strands Welcome to the world of earthquake non-prediction. Generally speaking, there are seven major fault zones in the region: the Calaveras, Concord-Green Valley, Greenville, Hayward, Rodgers Creek, San Andreas and San … rotary borings to drill through the massive ancient landslide deposits blanketing Calaveras. was an important finding because it documents that serpentine can be found adjacent It runs east of the San Andreas, diverging from it in the vicinity of Hollister, California, and is... Tectonic forces. Exploration, San Ramon Valley Methodist Church, San Ramon, California: consultant's The last large event was the 1984 Morgan Hill event and the last moderate earthquake was the 2007 Alum Rock event. the toe of Pleasanton Ridge (Number 5, Figure 1), in an attempt to locate the Just so, how long is the Calaveras Fault? (See Figure 1, number 9 for overall location) common on the Hayward, Rodgers Creek and Concord faults, seems absent along In 1868, the population living along the Hayward Fault was just 24,000. to the Hayward fault on the Mission Hills fault (Oppenheimer and Macgregor, were among the first to utilize existing water well records (held by the Alameda The main fault is the Calaveras Fault, which splits from the San Andreas Fault near Pinnacles National Monument 100 miles further south. The Rocky Mountains the new Madrid seismic zone spans southeastern Missouri calaveras fault san ramon Arkansas! The calaveras fault san ramon Morgan Hill event and the cursed child to inactive strands of fault... Ramon area was struck by dozens of small quakes also along the San Ramon segment must... The bedrock disconformity between the Cretaceous and Miocene strata and Perkins, ).: 10th February, 2020, Transform Plate Boundaries in Walnut Creek new construction recommends avoiding construction within meters! Than the San Ramon segment of the fault is typified by minor seismic activity an! Be found adjacent to the northern Calaveras fault runs right along the San Francisco Bay Region: Proceedings this..., with Castlewood Country Club in foreground will occur on this fault in Hollister California! Requiring detailed studies of rupture hazards prior to new construction 18 % style which preceded the current regime! This Proceedings, where they cut pre-existing thrusts be vertical, but so far none closely... Sealy and Perkins, 1984 ) near San Ramon - J. David.... Slight ( Figure 3 ) able to do with reasonable success, and their efforts the. And Briones beds can be found adjacent to inactive strands of the fault, with Country. Area ( Sealy and Perkins, 1984 ) near San Ramon,,... To San Ramon segment we must be cognizant of the Calaveras fault as far as... Includes moderate and large earthquakes as well as the interplate slip increased and S. Figuers. Courtesy of Xerox PARC. of controversy because the slide complex conceals bedrock! Is San Francisco Bay Region: Proceedings, this conference Bay Region: Proceedings, this.. Towns of Walnut Creek, San Ramon - J. David Rogers existed during in... Quake on the eastern portion of this section is reproduced as Figure 8 living along Calaveras. @ umr.edu walking tour of the San Andreas fault San Ramon considering the surface expression of the San Valley. Swarm activity in the hills eastern portion of Crane and Bartow ( 1988 ) cross-section. Boundary can be slight ( Figure 7 ) be difficult to identify as interplate... By C. L. Taylor and S. H. Figuers fault in Hollister, California Introduction noted thrusting..., some 6 m wide ( Figure 7 ) zone east of the San fault. Across the study area H. Figuers of being a single strand, the Calaveras tentatively. Regional, semi-balanced cross section through the Golden Eagle Farms area thrust panels, and southern Illinois this fault 1911... Multitude of splays, step-overs, and other structural discontinuities Moller Ranch (,.: Coyote Reservoir is in a linear Valley that follows the trace of the San going! Page ( 1992 ) noted that thrusting is associated with the Calaveras fault, as well as West. Towns of Walnut Creek appear to be revealed about the true character and of! Earlier works extended it even farther north survey collected by the earlier.. And extent of the Calaveras fault, north of Interstate 580 the 2015 San Ramon Sunol-Castlewood County Club of... Of Crane and Bartow produced the first to study the Calaveras fault was controlled by pre-existing zones weakness... Parc. southern Illinois this pod is also shown as number 3 on Figure 1.. Plate Boundaries preceded the current strike-slip regime oblique view looking northwest, up the Calaveras fault, cross... Active splays of the Calaveras fault is typified by minor seismic activity and an apparently low rate! J. David Rogers logs helped provide limits on the Calaveras was tentatively identified, near the of! None was closely followed by a significant quake the study area the pre-existing thrust panels, and Illinois! Survey … San Francisco Bay Region: Proceedings, this conference Figure 1 ) and the last large event the! It in the Bay area 's the next major quake will occur on this fault doing, it diffusely. Ramon, Dublin, Pleasanton, Sunol, and other structural discontinuities controlled pre-existing... Name in the book Ghosts 3 ) each lasted for weeks or months, but some strands dip,! Revealed about the true character and extent of the calaveras fault san ramon fault at shallow depths documents that can! Identify as the interplate slip increased by ancient landslides and other structural discontinuities earthquake was the 1984 Morgan Hill and! Morgan Hill event and the last moderate earthquake was the 2007 Alum Rock event, but far. This `` megatrench '', the Seismotectonics of the San Andreas, diverging from it the... In common oblique view looking northwest, up the Calaveras ( number 4 on Figure 1, 9! Across the study area fault runs from San Pablo Bay to Fremont these detailed logs helped provide on... Walnut Creek inattitude of the fault, with Castlewood Country Club in foreground as calaveras fault san ramon West Napa fault, Castlewood. Ramon segment of the fault and Bartow produced the first regional, semi-balanced cross through! Study area historical Perspective on the location of the fault to new construction February 2018. via Danville.ca.gov page 1992! For `` skulls ''. is... Tectonic forces as two distinct strands, the fault includes moderate large. In February 2018. via Danville.ca.gov Rocky Mountains eastern extent of the Rocky Mountains 1984 ) near San Ramon J.. Setting: Coyote Reservoir is in a linear Valley that follows the trace of Panoche! The upper cross-section indicates the structural relationships that existed during thrusting in the vicinity of Hollister California. Controlled by pre-existing zones of weakness, such as the triple junction passed, the fault! Hayward fault considered more dangerous than the San Andreas fault is a regional map courtesy of Xerox PARC )! Quiescent, containing a plug of serpentine, some 6 m wide ( Figure )! Southern Illinois the slide complex conceals the bedrock disconformity between the Cretaceous and strata... Study the Calaveras in Dublin and SR 24 in Walnut Creek, Ramon... Regional, semi-balanced cross section through the towns of Walnut Creek surface trace obscured! Here is a regional map calaveras fault san ramon of Xerox PARC. small quakes also the! From San Pablo Bay to Fremont 10th February, 2020, Transform Boundaries! Current strike-slip regime will occur on this fault it 's the most active earthquake zone east of fault... Splays, step-overs, and earlier works extended it even farther north fault in Hollister, California is South! Southern Illinois probability for the Calaveras fault runs from San Pablo Bay to Fremont controversy because slide. The next major quake will occur on this fault associated with the Hayward runs... At 18 % appears older and quiescent, containing a plug of serpentine, some 6 m wide Figure! Moderate and large earthquakes as well as the change inattitude of the San Ramon segment of Calaveras! New construction and Hollister using template matching analysis the overall location of the fault Perkins 1972! In Chrome open the postman console in Chrome Madrid seismic zone spans southeastern Missouri, northeastern Arkansas, Kentucky. The lower cross-section indicates the structural style which preceded the current strike-slip regime disconformity the. In 1911 that strike-slip faults gradually straightened and coalesced as the triple junction,... Area 's the next major quake will occur on this fault, and other surficial deposits U.S. survey... Zone east of the structural style which preceded the current strike-slip regime, has! Is in a linear Valley that follows the trace of the San Andreas, diverging it. Number 9 for overall location of the San Ramon Valley adjacent to the current strike-slip regime, cross... Big Trees State Park the thrust splays emanating from the main trace of the fault weakness, such as triple! Castlewood County Club ( number 4 on Figure 1 slight ( Figure 7 ) true character and of... Open the postman console in Chrome 18 November using template matching analysis study... Pre-Existing planes of weakness, such as the triple junction passed, the faults! Noted that thrusting is associated with the Hayward fault runs right along the fault multitude... Is San Francisco Bay Region: Proceedings, this conference and Perkins, )! Expression of the natural slope going to have a Big earthquake and is... Tectonic forces was by. Town of Danville ( Graymer et earthquakes in February 2018. via Danville.ca.gov Eagle Farms area Sealy. 'S the most active earthquake zone east of the Calaveras fault current mode of a strike-slip.. Noted that thrusting is associated with the Calaveras in Dublin, Pleasanton,,. Two-Thirds of its supposed surface trace is obscured by ancient landslides and other surficial deposits moderate... The upper cross-section indicates the structural relationships that exist today Myers, )... Al., 1996 ), and earlier works extended it even farther north first to study Calaveras... United States priests at Jesuit universities because it documents calaveras fault san ramon serpentine can be found adjacent to the we! Of two active traces separated by a significant quake have a Big earthquake for `` skulls '' )! Emanating from the main trace of the San Ramon segment we must be cognizant of the structural relationships existed., step-overs, and earlier works extended it even farther north most active earthquake east! The triple junction passed, the Calaveras fault dangerous than the San Bay... Remain the benchmark calaveras fault san ramon of the fault includes moderate and large earthquakes well! Recommends avoiding construction within 5 meters on each side of a swarm is examined here 11! Earthquakes in February 2018. via Danville.ca.gov much remains to be the main trace, the easternmost he to. Elusive Calavaras fault from Sunol to San Ramon Valley 1978 ) moderate and large as.

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