Copyright Information: All images are in the public domain and available for free. If you use this image, credit NOAA/NGDC, Joe Dellinger. |
(Left) Walkway to the front of 359 Locust Street, as it appeared in June 1985. The Calaveras fault runs from left to right across the middle of it. (Right) The same walkway as it appeared in February, 1991. According to residents, the walkway was rebuilt in 1989 and the sidewalk along the street was rebuilt in 1987. Reportedly, the walkway bulges up every few years from fault compression, and it has to have sections removed to relieve the bulge. Image Credit: Joe Dellinger. Seismic creep is the constant or periodic movement on a fault as contrasted with the sudden rupture associated with an earthquake. It is a usually slow deformation of rock resulting from constant stress being applied over a period of time. Sometimes aseismic slip is observed at the ground surface along a ruptured fault that has produced a substantial earthquake. Examples are from the Hollister and Hayward, California, region. Several of the slides are split images of a location, comparing fault movement over the years. |
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