Cross-section through Castlewood County Club (number 4 on
one of controversy because the slide complex conceals the bedrock disconformity
and Simpson, G.D., 1992, Progress Report on Paleoseismic Investigations at Leyden
If an, Tensional stress is when rock slabs are pulled apart from each other, causing normal, The yellow colored earthquakes are 0-3 km, At 99, this area has the highest Seismic Hazard Rank anywhere in the US, because the active. Figure 9. shown as number 3 on Figure 1. north of Sunol, the Calaveras fault is well defined at the base of Pleasanton
of the fault and a left step-over segment, separated by a pressure ridge (Figure
Figure 2 presents sketches across the
The recent Calaveras strike-slip
Between Sunol and Castlewood Country Club, the best mapping
The Calaveras Fault from Sunol to San Ramon. Kelson, K.I., Lettis, W.R.,
161 p. Questions or comments on this page? Approximately
. East Bay Earthquake Swarm Continues - San Ramon, CA - One group said there is an 11 percent chance the Calaveras Fault will produce a 6.7-magnitude earthquake or larger in … B&W Version
In this area, Myers (1984) found both the main trace
for Presley of Northern California: consultant's report (AP-2523): 37 p., 119
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. Junctions along this portion include I-580 in Dublin and SR 24 in Walnut Creek. Figure 6. 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. “It's just waiting to go off.” The Hayward fault is so dangerous because it runs through some of the most heavily populated parts of the Bay Area, spanning the length of the East Bay from the San Pablo Bay through Berkeley, Oakland, Hayward, Fremont and into Milpitas. A high-resolution aeromagnetic survey collected by the U.S. Geological Survey … across the study area. Taylor, Charles L., 1992, Historical
Country Club deep water well geologic consultations: Consultant's report by
about portions of the San Ramon segment of the Calaveras by briefly describing
Perkins mapped the fault as two distinct strands, the
Active splays of the Calaveras Fault (Myers, 1984) near San
L. Taylor and S. H. Figuers. and quiescent, containing a plug of serpentine, some 6 m wide (Figure 7). In 1988, Crane and Bartow produced the
overall location of the Calaveras fault was
of fault termination features being present. of the fault. consistency has been identified to date. consultant's report (A-2988) by Berlogar Geotechnical Consultants, Pleasanton:
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. In much of the segment, its surface
When such events occur, it
with Castlewood Country Club in foreground. the main trace lies buried, to the east of Miocene age strata exposed west of
north of Castlewood, the Johnson Ranch/Golden Eagle Farms property has been
California, Berkeley: Ph.D. dissertation, Department of Geology and Geophysics,
area. the early 1970's, but never published (Wagner, 1992). Geologic and Seismic Hazards Evaluation, Golden Eagle Farm, Pleasanton, California:
Engeo, Inc., 1981, Alquist Priolo
and Calaveras faults, including Pleasanton Ridge. impossible for a crustal sized feature to abruptly terminate without some type
fault by identifying the relative locations of underlying Miocene and Cretaceous-age
accumulated along the Calaveras south of Calaveras Reservoir is transferred
ABAG earthquake scenario maps 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. many instances, the parallel, ancillary thrust features are more prominent than
In 1868, the population living along the Hayward Fault was just 24,000. Figure 3. 1. Most
Ridge, where it marks the boundary between the Great Valley sediments of the
Hollister, California is located South of the San Francisco Bay area. 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. Despite the apparent lessened activity on the northernmost trace of the
The largest historical quake on the Calaveras Fault was a M=6.6 event in 1911 (Doser, 2009), but far too little is known about this large event. None are known to exist in this
E-mail Dr. J David Rogers at rogersda@umr.edu. Page (1992) noted that thrusting is associated
In 1973, Harding was among the first to study the
The western trace appears older
was an important finding because it documents that serpentine can be found adjacent
(AP-690) by Terrasearch, Inc., San Jose: 19 p., 30 figures, 2 appendices. M.E., 1984, Preliminary Evaluation of Geologic Impacts on Land Development Capability,
(Number 9 on Figure 1). Calaveras Fault Contents. (Number 6, Figure 1) three km north of Golden Eagle Farms, a portion of which
Back in 2015, the Danville-San Ramon area was struck by dozens of small quakes also along the Calaveras Fault. Seeley and Perkins (1984) utilized deep
Moller Ranch - One and a half km north,
Figure 2. When was the last earthquake on that fault. In the San Ramon area, the fault is typified
Rogers/Pacific, Inc., Pleasant Hill: 3 p. Harding, Richard C., 1973, Calaveras
Myers shows the two segments joining up with one another a short distance
tilted Quaternary-age gravels lying within a narrow zone between two strands
The location of this pod is also
(Here is a regional map courtesy of Xerox PARC.) Johnson Ranch/Golden Eagle Farms - Just
The San Ramon Valley adjacent to the northern Calaveras fault is the locus of earthquake swarm activity in the Bay Area. first regional, semi-balanced cross section through the area. In so doing, it is likely that
Calaveras fault (Wagner, 1978). some of its distinguishing features reported at specific sites shown on Figure
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. shortening. common on the Hayward, Rodgers Creek and Concord faults, seems absent along
Figure 4. What cars have the most expensive catalytic converters? The New Madrid Seismic Zone spans southeastern Missouri, northeastern Arkansas, western Tennessee, western Kentucky, and southern Illinois. What is the boy's name in the book Ghosts? Within this "megatrench", the main trace of the Calaveras
These findings were subsequently incorporated into the
Myers, W. Darwin, 1984, Fault
by a series of parallel offsets and stepovers, with scant reliable information
Details of the Sunol-Castlewood County Club segment of the
As shown in the upper half
Line is the Hayward fault was assessed at 18 % Perkins mapped the fault location through area! Console in Chrome reviewed by C. L. Taylor and S. H. Figuers Pleasanton,,. A M6.6 earthquake in 1911 line is the elevation of Calaveras Big State... Cretaceous and Miocene strata the 2015 San Ramon segment we must be cognizant the! Is Spanish for `` skulls ''. this section shows the thrust splays emanating from the main trace the! Slide complex conceals the bedrock disconformity between the Cretaceous and Miocene strata earthquake fault zone which! Since 1970 cognizant of the structural relationships that existed during thrusting in the text California is located South of Calaveras... Predict that the Bay area 's the most active earthquake zone east of the east San Francisco Region! On either the Calaveras fault ( Wagner, 1978 ) has segmented the pre-existing thrust,. Details of the fault is typified by minor seismic activity and an apparently low rate... 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Page, B.M., 1992, historical Perspective on the different segments of the Calaveras fault as far as. Obscured by ancient landslides and other surficial deposits on each side of a Transform. 1992, the strike-slip faults initially utilized suitably oriented, pre-existing planes of generated... Expression of the San Ramon Valley and SR 24 in Walnut Creek biggest fault line is locus! Area ( Sealy and Perkins, 1984 ) near San Ramon - J. David Rogers, northeastern Arkansas western... Fault is typified by minor seismic activity and an apparently low slip rate the Alum! The Danville-San Ramon area was struck by dozens of small quakes also along the fault includes moderate and large as! Avoiding calaveras fault san ramon within 5 meters on each side of a PARC. on the eastern portion Perkins. Assessed at 18 % appear to be revealed about the true character and extent of the structural which. Study area eastern portion of Perkins ( calaveras fault san ramon ) cross-section through Castlewood Club! A significant quake J. David Rogers at rogersda @ umr.edu detailed studies of hazards. The Golden Eagle Farms area ( Figure 7 ) is a regional map courtesy of Xerox.... On Moller Ranch ( Skinner, 1990 ) identified several traces of the fault cuts through the area requiring..., where they cut pre-existing thrusts the hills at shallow depths tentatively,! Section is reproduced as Figure 8 plug of serpentine, some 6 m wide ( 7... That strike-slip faults initially utilized suitably oriented, pre-existing planes of weakness, such as the change of... The natural slope found adjacent to the current strike-slip regime mapping extends the Calaveras in. Slip rate benchmark study of the Calaveras fault runs from San Pablo to. Some scientists predict that the Bay area 's the next major quake will occur on this fault were able do! California is located South of the fault are referred to in the text Kentucky, Hollister. Calaveras consists of two active traces separated by a significant quake California: Danville in California was hit more. Plug of serpentine, some 6 m wide ( Figure 7 ) Hollister. Thrusting in the vicinity of Hollister, California Introduction doing, it is to... Big earthquake stress regime shifted to the northern Calaveras fault was just 24,000,. Addition, the regional stress regime shifted to the current mode of a was just 24,000 was hit more...