San Andreas Fault

An earthquake planning scenario document was recently released by the USGS and California Geological Survey that hypothesizes the occurrence and effects of a MW7.8 earthquake on the southern San Andreas Fault. It was created by more than 300 scientists and engineers. Fault offsets reach 13m, and up to 8m at lifeline crossings. Physics-based modeling was used to generate maps of

This is a generalized geologic map of the San Andreas Fault and surrounding areas between Hollister and Carrizo Plains. It is part of my field guide "Roadside Geology of the San Andreas Fault: Hollister to Carrizo Plains National Monument

Get the text and area maps for this guidebook at:

https://www.academia.edu/s/c40aa8e7d1/roadside-geology-of-the-san-andreas-fault-hollister-to-carrizo-plains-national-monument

This is a generalized geologic map of the San Andreas Fault and surrounding areas between Parkfield and the Northern Carrizo Plains. It is part of my field guide "Roadside Geology of the San Andreas Fault: Hollister to Carrizo Plains National Monument.

Get the text and area maps at

https://www.academia.edu/s/c40aa8e7d1/roadside-geology-of-the-san-andreas-fault-hollister-to-carrizo-plains-national-monument

The purpose of this study was to make a geologic map and cross sections of part of the Orocopia Mountains, and to interpret the history of geologic events.  The study area is located northwest of the Salton Sea within the Orocopia Mountain Range, located north of the Gulf of California, and is part of an extensional province which affects the surrounding geology.  In the study area we specifically looked at the Oligocene Diligencia Formation stratigraphically above the Precambrian igneous and metamorphic complex. Through dynamothermal metamorphism there was a high-grade paragneiss formed from a sedimentary protolith in the Precambrian. Then in the Oligocene red sandstones were deposited, follwed by vari-colored sandstones, then igneous volcanic flows covered and compacted the materials below, but were intermittent because of the presence of a sandstone marker unit present in the middle of the basalt. After the basaltic flows stopped, a gray sandstone was deposited, and a gray mudstone. Next a series of folds were caused by underthrusting, and a second set from from exhumation. Lastly modern day river channels seemed to have caused terrace alluvium.

This field trip  begins at Lloyd’s Restaurant at the junction of Highways 210 and 2 in La Canada California. We proceed on Foothill Blvd to Newhall and Castaic Junction. We take the Old Ridge Route over the Liebre Mountains to Quail Lake. The San Andreas Fault is
examined from Ft. Tejon to Wrightwood. The tour returns to La Canada via Highway 2 over the San Gabriel Mountains.

This trip begins at the R. C. Baker Memorial Oil Museum located at
297 Elm Street, Coalinga, Ca., and continues along State Highway
198 with stops at the Coalinga Sulphur Baths & Plunge (just outside
of Coalinga) and Coalinga Mineral Hot Springs County Park (farther
along State Highway 198). Proceed west on State Highway 198 to the
intersection of State Highway 25. Turn north at this intersection
The road parallels the San Andreas Fault Zone for the rest of the
trip. The lunch stop is in Bitterwater Valley at a private home
located 0.4 of a mile before the Bitterwater School. The trip will
continue along State Highway 25 and end at the Pinnacles National
Monument.

This trip starts from the Beale Library parking lot, located on the
southeast corner at Truxtun and Q streets, Bakersfield, California.
The point of interest is at Fort Tejon. From the fort, the tour will proceed along the San Andreas Fault through Gorman, Frazier Park, Mil Potrero and into the Carrizo Plains. If weather is poor the trip will make a detour to Maricopa and proceeds through the west side to McKittrick, and over the Temblor Range into the carrizo Plains. After viewing the fault at Wallace Creek, the tour will proceed back to Highway 58, over the Temblor Range, and return to the San Joaquin Valley. In order to present the maximum amount of information, stops are limited to 20 minutes. After Frazier Park there will be no scheduled stops where food can be purchased. Participants are encouraged to bring a sack lunch and  everages

This guidebook describes stops at the San Andreas Fault where fault scarps created by the 1857 Ft. Tejon earthquake are inspected. Taking Highway 166 into the Cuyama Valley stops are described at oil fields and fossil localities on the way to Santa Maria. From Santa Maria this guidee discusses the geology and natural history from Highway 1 to Lompoc and the diatomaceous earth mine operated by Celite Corporation.  Next stop is La Purisima Mission were we learn about the early colonization of California. Then final stop is at  Point Sal were unusual ophiolite rocks are studies and plate tectonic theory is explained.

This road log is a compilation of many years of work and especially the field guides by Sylvester and Crowell (1989), Lynch (2005) and Baldwin et. Al (1989). Excerpts from these guidebooks are rendered in italics in this field guide. Staff of the Bureau of Land Management, U.S. Forest Service. U.S. Geological Survey and U.S. Park Service have also contributed significant portions of the information contained in this guide since 1984.

This guidebook gives an overview of the geology and biology of the Ridge Basin. Our goal is to show how the landscape has changed over the past 3,000 million years and how man has dramatically influenced this change in the past 150 years.The first part of this field guide describes the geology and ecology along the Old Ridge Route.
Originally completed in 1915, this was the first concrete highway in California and the main connecting route between Los Angeles and the San Joaquin Valley. The second part of this field guide begins in San Francisquito Canyon, we describe the evidence and affects of the Saint Francis Dam disaster of 1928. The interaction of humans in the creation of the Los Angeles Aqueduct which brought water all the way from the Owens Valley, the geology of ancient landslides in the Pelona Schist, and the engineering behavior (hydraulic fracturing) of concrete dams lead to a catastrophe which killed 261 people. The final part of this field guide is between Lake Elizabeth and Quail Fire Station, we investigate the
San Andreas Fault. The San Andreas had its last big earthquake in this area in 1857. The magnitude 8 "Fort Tejon" earthquake had a magnitude 5 aftershock in the area of this field trip. Being closer to Los Angeles than the epicenter of the main shock 150 miles northwest in the Carrizo
Plains, the Lake Elizabeth aftershock was felt more strongly in Los Angeles.

The trip starts from Fort Tejon State Park parking lot, located on
the west side of 1-5, north of Gorman, south of Bakersfield, in the
town of Fort Tejon, the headquarters of the Tejon Ranch. From Fort
Tejon, the tour will proceed along the San Andreas Fault through
Gorman, the National Cement Company, Lake Hughes lunch stop,
Palmdale, Devil’s Punchbowl, and ends at Pallet Creek.
In order to present the maximum amount of information, most stops
are limited to 20 minutes, except for the lunchtime stop and the
National Cement stop which will be longer. Participants are
encouraged to bring a sack lunch and beverages. All vehicles are
encouraged to bring a CB radio set to channel 20.

A CB RADIO OR HIGH-CLEARANCE VEHICLE IS NOT A REQUIREMENT FOR THIS TRIP. ALL TRAVEL IS ON PAVED ROADS.

This field guide starts in Hollister California and ends at Camp Dix (Rey's Station) at the southern end of Carrizo Plains National Monument. The guide is in three parts:

Section 1: Text (this file)
Section 2: Area Maps: (this file)
Section 3: Regional Maps

001: Hollister to Parkfield
https://www.academia.edu/47737084/ROADSIDE_GEOLOGY_OF_THE_SAN_ANDREAS_FAULT_HOLLISTER_TO_CARRIZO_PLAINS_NATIONAL_MONUMENT_Regional_Map_001_Hollister_to_Parkfield

002: Parkfield to Northern Carrizo Plains
https://www.academia.edu/47737126/ROADSIDE_GEOLOGY_OF_THE_SAN_ANDREAS_FAULT_HOLLISTER_TO_CARRIZO_PLAINS_NATIONAL_MONUMENT_Regional_Map_002_Parkfield_to_Northern_Carrizo_Plains

003 Northern Carrizo Plains to Camp Dix
https://www.academia.edu/47737251/ROADSIDE_GEOLOGY_OF_THE_SAN_ANDREAS_FAULT_HOLLISTER_TO_CARRIZO_PLAINS_NATIONAL_MONUMENT_Regional_Map_003_Northern_Carrizo_Plains_to_Camp_Dix

In addition to describing seismic features, this guide also explores the oil, gas and mine development history of this section of the San Andreas Fault Zone.

The purpose of this article is to provide an ultimate tectonic explanation for several well-studied zoogeographic boundaries along the west coast of North America, specifically, along the boundary of the North American and Pacific plates (the San Andreas Fault system). By reviewing 177 references from the plate tectonics and zoogeography literature, I demonstrate that four Great Pacific Fracture Zones (GPFZs) in the Pacific plate correspond with distributional limits and spatially concordant phylogeographic breaks for a wide variety of marine and terrestrial animals, including invertebrates, fish, amphibians, reptiles, birds, and mammals. These boundaries are: (1) Cape Mendocino and the North Coast Divide, (2) Point Conception and the Transverse Ranges, (3) Punta Eugenia and the Vizcaíno Desert, and (4) Cabo Corrientes and the Sierra Transvolcanica. However, discussion of the GPFZs ismostly absent from the zoogeography and phylogeography literature likely due to a disconnect between biologists and geologists. I argue that the four zoogeographic boundaries reviewed here ultimately originated via the same geological process (triple junction evolution). Finally, I suggest how a comparative phylogeographic approach can be used to test the hypothesis presented here.

This is a generalized geologic map of the San Andreas Fault and surrounding areas between the northern Carrizo Plains and Camp Dix. It is part of my field guide "Roadside Geology of the San Andreas Fault: Hollister to Carrizo Plains National Monument.

Get the text and area maps at

https://www.academia.edu/s/c40aa8e7d1/roadside-geology-of-the-san-andreas-fault-hollister-to-carrizo-plains-national-monument

A kinematic model for southern California, based on late-Quaternary slip rates and orientations of major faults in the region, is proposed. Internally consistent motions are determined assuming that these faults bound rigid blocks. Relative to North America, most of California west of the San Andreas fault is moving parallel to the San Andreas fault through the Transverse Ranges and not

In 2008, an earthquake-planning scenario document was released by the U.S. Geological Survey (USGS) and California Geological Survey that hypothesizes the occurrence and effects of a Mw7.8 earthquake on the southern San Andreas Fault. It was created by more than 300 scientists and engineers. Fault offsets reach 13 m and up to 8 m at lifeline crossings. Physics-based modeling was used to generate maps of shaking intensity, with peak ground velocities of 3 m/sec near the fault and exceeding 0.5 m/sec over 10,000 km2. A custom HAZUS®MH analysis and 18 special studies were performed to characterize the effects of the earthquake on the built environment. The scenario posits 1,800 deaths and 53,000 injuries requiring emergency room care. Approximately 1,600 fires are ignited, resulting in the destruction of 200 million square feet of the building stock, the equivalent of 133,000 single-family homes. Fire contributes $87 billion in property and business interruption loss, out of the total ...