This strongly suggests increased damage closer to the fault within the footprint of the seismic array. That velocity difference increases closer to the fault zone. Rock is softer when the earth stretches and stiffer when the earth compresses, and seismic waves travel more quickly when the earth is compressed than when extended. They measured the velocity of seismic waves and the stiffness of fractured rock. “The work opens the possibility for field studies of material behavior that have previously been studied only in laboratory research.”ĭelorey led the team of researchers who used 17 years of seismic data to determine patterns in the rocks’ responses to tidal forces. “The amount of this softening or stiffening tells us something about the material damage along the San Andreas Fault and may also tell us something about the earthquake cycle,” said Andrew Delorey, a scientist at Los Alamos National Laboratory.
11, 2021–Recent research into the way cracks in the earth’s crust open and close along the San Andreas Fault has yielded a new way of studying earthquake behavior that bridges an important gap between laboratory experiments and earth observations, demonstrating a new way to study upper crustal behavior. As New York state doesn't have any seismic building codes, they suffered worse damage than Los Angeles after the first quake.LOS ALAMOS, N.M., Oct. 2 weeks later Manhattan and Brooklyn suffered major damage to several moderate to major earthquakes, the largest of them being magnitude 7.4. and San Francisco was going to get hit due to a not so obvious connection between an unknown fault, connecting with the San Andreas Fault as a 7.1 hit Nevada centered just 5 miles north of the Hoover Dam, causing it to collapse. Later 4 aftershocks of the 9.6 earthquake hit in magnitudes: 6.7 7.1 8.4 8.9. The resulting tsunamis destroyed the ruins of the following cities and counties: Marin, Napa, San Francisco, and Monterey as well as coastal areas of central California.
Just 2 hours after the first earthquake, another major earthquake occurred on the 236 miles of the northern San Andreas Fault at magnitude 9.6, this one was felt as far, as Miami Florida. There were 7 aftershocks ranging in magnitudes from 6.7 to 7.8. The initial earthquake was felt as far north as San Francisco and the Bay Area. The damage in Southern California is expected to be massive in fact the entire state took a hit from the first quake. The first one struck at 12:20pm just 20 miles east of Downtown Los Angeles, Cell towers were down, most of the city's electricity down. This disaster consisted of 2 major earthquakes at magnitude 9.1 and a bigger one at 9.6 on all 800 miles of the San Andreas Fault. On May 29, 2015, the entirety of California experienced a catastrophic disaster never before seen in the world.
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