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Earthquake Faults

August 2, 2013 | By Rong-Gong Lin II, Michael Finnegan and Rosanna Xia
The developers of a Hollywood skyscraper project said Friday they have agreed to dig a trench on the property to help determine whether an earthquake fault runs under it. Officials at New York-based Millennium Partners said that they do not believe the Hollywood fault runs underneath the project, but that if a fault was found, they would not build over it. Extensive digging under the site is considered by seismic experts to be the best way...
July 31, 2013 | By Rosanna Xia
An unmanned submarine set to dive more than 1,000 feet to scour the bottom of Lake Tahoe didn't quite make it all the way.  During shallower test dives earlier this month, the submarine encountered complications with a few of its motors, said Gordon Seitz with the California Geological Survey. The engineers who created the vessel considered the problems serious enough that they didn't want to risk diving it all the way to the bottom of the lake, he said.   The 28-foot-long, 2,200-pound submarine, designed to explore beneath the ice shelves of Antarctica, was diving Lake Tahoe in its first test run. Seitz and his team hoped to capture valuable data and high-definition images of an earthquake fault along the lake's bottom that scientists have wondered about for years.
July 22, 2013 | By Kate Linthicum
Los Angeles officials have asked the developer of a controversial Hollywood skyscraper project to conduct a new round of seismic tests to determine whether the project's towers could be at risk in an earthquake. At the same time, state officials are carrying out their own geological study of the area to find out whether a known fault line near the building site is active. The questions surrounding the project's safety come at a critical time, with the City Council poised to take up a major vote on the proposal Wednesday.
May 29, 2013 | By Rong-Gong Lin II and Kate Mather, Los Angeles Times
A moderate 4.8 earthquake off the Santa Barbara coast Wednesday was felt over a wide swath of California, from the Central Coast to Los Angeles County, but no damage was reported. The temblor struck at 7:38 a.m. about five miles west of UC Santa Barbara. The Santa Barbara area is home to a number of earthquake faults, the largest of which is the Santa Ynez fault, which is 80 miles long and runs just north of the city. That fault is believed to be capable of triggering an earthquake as powerful as 7.5. People closest to the epicenter felt moderate shaking, but the only effects reported were the falling of a few photo frames.
May 29, 2013 | By Kate Mather, Rong-Gong Lin II and Kurt Streeter
The magnitude of Wednesday's earthquake off the Santa Barbara coast has been upgraded to 4.8, according to the U.S. Geological Survey. The earthquake -- which struck at 7:38 a.m. about five miles west of UC Santa Barbara -- was initially reported at magnitude 4.9, then adjusted to 4.6, according to the USGS website. It was upgraded by late morning. The Santa Barbara area is home is a number of earthquake faults, the largest of which is the Santa Ynez Fault, which is 80 miles long and runs just north of the city.
November 12, 2012 | By Ralph Vartabedian, Los Angeles Times
Civil War veteran William Hood arrived at the mosquito-infested swamps near Bakersfield in 1874 to build a rail line that would soar through the Tehachapi Mountains, linking the Bay Area and Southern California for the first time. Hood, Southern Pacific Railroad's chief assistant engineer, assembled 3,000 Chinese immigrants with picks, shovels and dynamite. They snaked the track up treacherous mountain ridges, twisted it back and forth around canyons and punched it through sheer rock in a series of 18 tunnels - climbing 4,025 vertical feet along the way. It's a feat no one has attempted to duplicate.
October 4, 2012 | By Monte Morin
Seismologists' understanding of how rock surfaces behave when ground together in earthquake faults has been limited by their ability to conduct experiments that simulate the massive forces generated in a temblor. For many years, researchers have simply taken two adjoining rock surfaces and placed pressure on them until they broke. This method, however, doesn't come close to representing the force of large, damaging earthquakes. Now, seismologists at University of Oklahoma and the U.S. Geological Survey say they have created a device that approximates the force exerted by a Magnitude 8 earthquake.
September 29, 2012 | By Louis Sahagun, Los Angeles Times
Over objections of Central Coast residents and environmental groups, Pacific Gas & Electric plans to map earthquake fault zones near its Diablo Canyon nuclear plant by blasting high-decibel air cannons under the surface of the ocean. PG&E's plan calls for towing a quarter-mile-wide array of underwater "air cannons" that emit 250-decibel blasts into the ocean every 15 seconds for 12 straight days. The sonic reflections would be picked up by underwater receivers and analyzed to provide detailed 3-D images of the geometry, relationships and ground motions of several fault zones near the Diablo facility, which generates enough energy to meet the needs of more than 3 million Northern and Central Californians.
January 29, 2012 | By Bettina Boxall, Los Angeles Times
Rough-Hewn Land A Geologic Journey From California to the Rocky Mountains Keith Heyer Meldahl University of California Press: 297 pp., $34.95 Think of the West and what comes to mind are vertiginous peaks, sculpted tablelands and the infinite vistas of basin and range country. In other words, geology. Westerners live in the shadow of mountains that are still rising, on the edge of a continent on the move, over fault systems that can unleash the power of nuclear bombs.
July 28, 2009 | Jia-Rui Chong
By bouncing sound waves off the floor of the Salton Sea, researchers have discovered more than a dozen previously unknown earthquake faults, leading to a new theory of how the ground is sinking and stretching near the infamous San Andreas fault. Danny Brothers, lead author of a study published Sunday, said the new understanding of the area's seismic mechanics does not appear to suggest that a massive quake on the San Andreas is more imminent than previously believed.
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