Frequency characteristics and far-field effect of gravity perturbation before earthquake |
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| Authors: | Jian-Ke Qiang Kai Lu Qian-Jiang Zhang Kai-Feng Man Jun-Ying Li Xian-Cheng Mao Jian-Qing Lai |
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| Institution: | 1.School of Geosciences and info-physics,Central South University,Changsha,China;2.The Key Laboratory of Metallogenic Prediction of Nonferrous Metals of Ministry of Education,Central South University,Changsha,China |
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| Abstract: | We used high-pass filtering and the Fourier transform to analyze tidal gravity data prior to five earthquakes from four superconducting gravity stations around the world. A stable gravitational perturbation signal is received within a few days before the earthquakes. The gravitational perturbation signal before the Wenchuan earthquake on May 12, 2008 has main frequency of 0.1–0.3 Hz, and the other four have frequency bands of 0.12?0.17 Hz and 0.06?0.085 Hz. For earthquakes in continental and oceanic plate fault zones, gravity anomalies often appear on the superconducting gravimeters away from the epicenter, whereas the stations near the epicenter record small or no anomalies. The results suggest that this kind of gravitational perturbation signals correlate with earthquake occurrence, making them potentially useful earthquake predictors. The far-field effect of the gravitational perturbation signals may reveal the interaction mechanisms of the Earth’s tectonic plates. However, owing to the uneven distribution of gravity tide stations, the results need to be further confirmed in the future. |
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