Copyright Information: All images are in the public domain and available for free. If you use this image, credit NOAA/NGDC, Dr. Edward Berg (left); Joe Dellinger (right). |
(Left) 164 Locust Street photographed from southeast of the manhole cover in the middle of the street. Note the bend in the curb produced by the Calaveras fault. The photo was taken in December, 1966. (Right) Same location nearly 26 years later. Note the increase in the offset along the Calaveras fault, producing wave-like curbing. This second photo was taken on August 4, 1992. Image Credit: Dr. Edward Berg (left); Joe Dellinger (right). 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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