Copyright Information: All images are in the public domain and available for free. If you use this image, credit NOAA/NGDC, Joe Dellinger. |
Curb at north end of crosswalk by Central and Locust Streets, August 4, 1992. Graffiti in the cement of the curb indicates it was poured April 22, 1975, so this photo demonstrates 16 years of creep on the Calaveras fault. The coin is used for scale. Image Credit: Joe Dellinger. Photo Date: August 4, 1992 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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