基于伪魏格纳-维勒分布的地磁场时频分析研究以中国大陆东部地区为例

Abstract

Abstract: Using time-frequency analysis method based on the pseudo-Wigner-Ville distribution(SPWVD), we analyzed earthquakes greater than M_S4.5 between 2007 and 2015 and east of 108°E. We found that ① 3 months before the earthquakes, the SPWVD time-frequency analysis of the abnormal high value anomaly frequency increased, and anomaly density also increased. Abnormal frequency density rise around 2—3 times compared to the year average. ② The epicenter distance is within 200 km, and the anomaly is relatively obvious, abnormal amplitude with the epicenter distance increased, and the characteristics of amplitude decreases, and within a month before the earthquake has the potential of full-year extremum. Therefore, when abnormal frequency increased markedly in a short period of time (1—3 months) (excluding outer influence), abnormal frequency density reached 2 to 3 times the average for the whole year, we should pay more attention to possible M_S4.5 earthquake in the abnormal area of 200 km range.

Key words: Time-frequency analysis, SPWVD method, Precursor informational extraction, Eastern China

CLC Number:

P315.7

ZHANG Ming-dong, HE Kang, LIAO Xiao-feng, DING Jing, CAO Ying. Time-frequency Analysis of Geomagnetic Field based on Pseudo-Wigner-Ville Distribution in Eastern China[J]. EARTHQUAKE, 2018, 38(1): 61-73.

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Time-frequency Analysis of Geomagnetic Field based on Pseudo-Wigner-Ville Distribution in Eastern China

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