When not hanging around the fault or using the large telescopes on Mauna Kea, he plays fiddle, collects rattlesnakes, gives public lectures on rainbows and writes books (Color and Light in Nature, Cambridge University Press) and essays. Homes can be built within the zone but cannot be directly atop a fissure.A state law enacted in the early 1970s established special studies zones that extend an eighth of a mile on either side of the outer limits of faults.
TIMES STAFF WRITER Type of Fault: right-lateral strike-slip. There is a 30% chance for such a quake to spring from the Mojave section of the San Andreas that runs through the Antelope Valley.A great quake could be especially bad news for Palmdale. Within Los Angeles County, Palmdale--with a population of 46,000--is one of the most developed areas crossed by the fault.“It’s going to be a real ‘E’ ride, and we’ve got ringside seats to the main event,” said Mark Spykerman, a Lancaster engineering geologist who advises Antelope Valley developers on their projects.Estimates differ, but geologists predict that a great earthquake will cause a 10- to 20-foot shift of land from one side of the main fault to the other, enough to slide the slow lane of the Antelope Valley Freeway into the fast lane. The San Andreas Fault is a continental transform fault that extends roughly 1,200 kilometers (750 mi) through California. Larger image SCEC Community Fault Model This map shows the 3-dimensional structure of major faults beneath Southern California.
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If that doesn’t close the freeway, forecasters say landslides or road collapses are likely between Palmdale and the San Fernando Valley.The result, earthquake experts say, is that Palmdale probably would be cut off from the Los Angeles area for at least several days. The city has only a few buildings even five to six stories tall. Length: 1200 km 550 km south from Parkfield; 650km northward Nearby Communities: Parkfield, Frazier Park, Palmdale, Wrightwood, San Bernardino, Banning, Indio Last Major Rupture: January 9, 1857 (Mojave segment); April 18, 1906 (Northern segment)
Geography.
Soledad Pass is in the southwestern corner.
Depending on the vehicle you choose, you can also calculate the amount of CO2 emissions from your vehicle and assess the environment impact. And, unlike Los Angeles, Palmdale has no older unreinforced masonry buildings, the most vulnerable in earthquakes.Many in Palmdale minimize the impact that a great quake might have. This valley is a long narrow valley separated from the Antelope Valley by the San Andreas fault ridge, known as Ritter Ridge, so named after one of the settlers from Nebraska in the 1880s. The northwest movement of the Pacific Plate is also creating significant compressional forces which are especially pronounced where the North American Plate has forced the San Andreas to jog westward. In other places, it is more subtle because the fault hasnât moved in many years and is covered with alluvium, or overgrown with brush.
The company that developed the area was required by law to lay out the enormous yards to keep the houses back from an offshoot of the fearsome San Andreas Fault that runs under the quiet street.The houses, some of which are 90 feet from the curb, illustrate how Palmdale--one of the fastest-growing cities in California--deals with the fearsome fault zone that crosses its southern sector.Joseph Hrobar, 66, like other residents of Bayberry Street, says he isn’t concerned about what might come, even after watching the carnage wrought by last month’s 7.1-magnitude temblor in the Bay Area. Pinnacles National Monument in Monterey County is only half of a volcanic complex, the other part being 200 miles southeast in Los Angeles County and known as the Neenach Volcanics.There are many myths and legends about the San Andreas Fault, the biggest being that it will one day crack and California will slide into the sea. San Francisco, Sacramento and the Sierra Nevada are on the North American Plate. It forms the tectonic boundary between the Pacific Plate and the North American Plate, and its motion is right-lateral strike-slip (horizontal).
One picture of how a quake might affect Palmdale came from a 1982 state report envisioning a repeat of the 8.3-magnitude Fort Tejon quake of 1857, the last time the portion of the San Andreas through the Antelope Valley broke loose.In and around Palmdale, major regional arteries might be severed, including two major Southern Pacific railroad lines and the California Aqueduct that serves Los Angeles, the state report said.The aqueduct, the major channel moving water north to south, crosses the San Andreas at two points near Palmdale.
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Suddenly the built-up strain breaks the rock along the fault, and the plates slip a few feet all at once. After the Bay Area quake, the city’s building and safety director and its earthquake coordinator suggested that Palmdale would actually suffer less shaking in a major quake because of its proximity to the fault. The aqueduct could be closed for three to six months while workers try to repair expected ruptures, the state report said.
This has led to the formation of the Transverse Ranges in Southern California, and to a lesser but still significant extent, the Studies of the relative motions of the Pacific and North American plates have shown that only about 75 percent of the motion can be accounted for in the movements of the San Andreas and its various branch faults. A
A complex network of mostly parallel faults often run on either side for some distance. State and National parks are strung along the fault like beads on a string. 1952 Aerial photograph of the area prior to construction of highway 14 and excavation of the road cut.
Fault Name Index San Andreas Fault Zone.
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