A network of superconducting gravimeters detects submicrogal coseismic gravity changes |
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Authors: | Imanishi Yuichi Sato Tadahiro Higashi Toshihiro Sun Wenke Okubo Shuhei |
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Institution: | Ocean Research Institute, University of Tokyo, 1-15-1, Minamidai, Nakano, Tokyo 164-8639, Japan. imanishi@ori.u-tokyo.ac.jp |
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Abstract: | With high-resolution continuous gravity recordings from a regional network of superconducting gravimeters, we have detected permanent changes in gravity acceleration associated with a recent large earthquake. Detected changes in gravity acceleration are smaller than 10(-8) meters seconds(-2) (1 micro-Galileo, about 10(-9) times the surface gravity acceleration) and agree with theoretical values calculated from a dislocation model. Superconducting gravimetry can contribute to the studies of secular gravity changes associated with tectonic processes. |
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