The length of the arrows shows the rate at which the benchmarks are moving.Can movement along earthquake faults be detected from space?
Compression forces a fault block upward.A thrust fault is a special kind of reverse fault where one or more plates are under the ocean. Diablo, and San Gregorio Faults. This Google Earth file shows the 8 significant earthquake producing faults in the Bay Area: the Hayward, Calaveras, Concord-Green Valley, Greenville, Rodgers Creek, San Andreas, Mt.

A reverse fault is usually associated with plates that are colliding.

The energy that's released sets an earthquake in motion. Well, scientists use highly-accurate GPS devices to measure the locations of benchmarks throughout the Bay Area, which they re-occupy over a span of years to measure how these benchmarks have moved. The San Francisco Bay Area is criss-crossed by a series of major faults that together relieve the motion and grinding between the huge Pacific and North American plates. Geologists have discovered that two deadly faults beneath San Francisco—the Hayward and Rodgers Creek faults—may be linked.

The satellite then re-images the same location after a period of time, which allows scientists to detect changes in the earth’s surface. The rock or fault rebounds, and the process may begin again. The process of one plate diving under the other is called subduction. 1906 earthquake, scientists learned that this ability of rock to stretch and The arrows shown in this Google Earth file represent movement of benchmarks in the Bay Area over time. Residents of Southern California are on high alert after a 7.1-magnitude earthquake rocked communities near the Mojave Desert on Friday, just one day after a … The fault that caused the Sumatra earthquake and tsunami in December 2004 was this sort of fault. The San Francisco Bay Area is sliced and diced by a series of faults that together accommodate the relative motion between the Pacific and North American plates. show bends and shifts. Strike-slip faults tend to occur along the boundaries of plates that are sliding past each other. 1906 San Francisco earthquake—is a strike-slip fault. Scientists produce maps like the one in this Google Earth file that shows ground deformation. This means two fault blocks are moving past each other horizontally. This usually happens at a plate boundary where two plates are moving in different directions, or in the same direction at different speeds. The warmer colors indicate greater movement relative to the satellite. relative to each other. Satellites passing above the ground emit radar that bounces off the earth and returns back to the satellite, measuring the topography of the earth. As the stress builds, strong rock or a locked fault (a fault where the two sides are held together by friction) deform elastically. In addition, large numbers of smaller aftershocks usually follow a large earthquake, as after the magnitude 6.9 1989 Loma Prieta earthquake.Do you have a GPS on your cell phone?

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