华北北部几次中强地震前的地磁前兆特征①

EARTHQUAKE ›› 1999, Vol. 19 ›› Issue (2): 168-178.

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CHARACTERISTICS OF GEOMAGNETIC PRECURSORY ANOMALIES BEFORE THE MODERATELY STRONG EARTHQUAKE IN NORTH CHINA

Huang Xuexiang¹⁾, Zhang Meixian²⁾, Lin Yunfang³⁾, Zhang Shulan¹⁾

¹⁾Cen ter for Analysis and Prediction, CSB, Beijing 100036, China;
²⁾Seis mological Bureau of Shanxi Province, Taiyuan 030002, China;
³⁾Ins titute of Geophysics, CSB, Beijing 100081, China

Received:1998-04-27 Revised:1998-10-05 Online:1999-04-30 Published:2022-09-19

Abstract

Abstract: In this paper, the authors describe the geomag netic precursory anomalies observed be-fore the moderately strong earthquake in North China and analyse their characteristics of time process and spatial distribution. The results indicate that the mid-term, short-term and imminent anomalies of geomagnetic precursors occurred several days to several months before the earthquakes, and the distribution of precursory anomalies is of a certain regu-larity and shows a certain corresponding relation with the earthquake occurrence.

Key words: Moderately strong earthquake, Geomagnetic anomaly, Precursory char-acteristics

Huang Xuexiang, Zhang Meixian, Lin Yunfang, Zhang Shulan. CHARACTERISTICS OF GEOMAGNETIC PRECURSORY ANOMALIES BEFORE THE MODERATELY STRONG EARTHQUAKE IN NORTH CHINA[J]. EARTHQUAKE, 1999, 19(2): 168-178.

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CHARACTERISTICS OF GEOMAGNETIC PRECURSORY ANOMALIES BEFORE THE MODERATELY STRONG EARTHQUAKE IN NORTH CHINA

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