Frequency characteristics and far-field effect of gravity perturbation before earthquake
Qiang Jian-Ke1,2, Lu Kai1, Zhang Qian-Jiang1, Man Kai-Feng1, Li Jun-Ying1, Mao Xian-Cheng1,2, and Lai Jian-Qing1,2
1. School of Geosciences and info-physics, Central South University, Changsha 410083, China.
2. The Key Laboratory of Metallogenic Prediction of Nonferrous Metals of Ministry of Education, Central South University, Changsha 410083, China.
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.
This work was financially supported by the National Science Fund of China Project (Nos. 41174104 and 41472301) and the Project of Innovation-driven Plan in Central South University (No. 2015CX008).
Cite this article:
QIANG Jian-Ke,LU Kai,ZHANG Qian-Jiang et al. Frequency characteristics and far-field effect of gravity perturbation before earthquake[J]. APPLIED GEOPHYSICS, 2017, 14(1): 1-9.
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