Application of wavelet analysis to crustal deformation data processing |
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| Authors: | Zhang Yan Wu Yun Liu Yong-qi and Shi Shun-ying |
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| Institution: | (1) Institute of Geophysics, China Earthquake Administration, 100081 Beijing, China;(2) Wuhan Base of Institute of Crustal Dynamics, China Earthquake Administration, 430071 Wuhan, China;(3) Institute of Seismology, China Earthquake Administration, 430071 Wuhan, China;(4) Wuhan University, 430079 Wuhan, China |
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| Abstract: | The time-frequency analysis and anomaly detection of wavelet transformation make the method irresistibly advantageous in non-stable
signal processing. In the paper, the two characteristics are analyzed and demonstrated with synthetic signal. By applying
wavelet transformation to deformation data processing, we find that about 4 months before strong earthquakes, several deformation
stations near the epicenter received at the same time the abnormal signal with the same frequency and the period from several
days to more than ten days. The GPS observation stations near the epicenter all received the abnormal signal whose period
is from 3 months to half a year. These abnormal signals are possibly earthquake precursors.
Foundation item: Joint Seismological Science Foundation of China (604021) and National Natural Science Foundation of China (40074024). |
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| Keywords: | time-frequency analysis anomaly detection deformation data earthquake precursor |
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