Seismic tomogram of the San Andreas fault at Parkfield,central California,showing the locat- ion of microquakes (yellow & white dots). Each image shows a horizontal cross-section (tomogram),25km by 20km,at different depths. Green & blue squares are seismometers. Red & blue areas are different types of rock structure. Microquakes relieve strain caused by the crustal plates moving on either side of the San Andreas fault. Two- thirds of the way down the fault is a small area next to a seismometer that seems unrelieved by microquakes. This is the expected epicentre of the earthquake predicted to occur before 1993 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / J. LEES & P.MALIN, UC SANTA BARBARA |
Bildgröße: | 4847 px × 3780 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |