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EARTHQUAKE ›› 1999, Vol. 19 ›› Issue (2): 209-213.

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STUDY ON THE CHARACTERISTICS OF PRECURSORY ANOMALIES BEFORE THE MS 4. 0 SHUNYI EARTHQU-AKE AND MON ITORING ABILITY OF PRECURSOR OBSERVATIONAL NETWORK IN BEIJING AREA

Gu Yongxin1), Ma Zhiming1), Gao Fuwang2)   

  1. 1)Seismological Bureau of Beijing Municipality, Beijing 100083, China;
    2)Center for Analysis and Prediction, CSB, Beijing 100036, China
  • Received:1998-06-26 Revised:1998-07-01 Online:1999-04-30 Published:2022-09-19

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Abstract: In this paper, we have analyzed the numbers, the observation methods and the distri-bution of the precursory monitoring network in Beijing a rea. The density of the precursory monito ring network is calculated. We research the characteristics of precursory anomalies befo re the MS 4. 0 Shunyi earthquake. The result shows that there is an anomaly-concen-trated a rea of 35 km around epicenter before the earthquake and most items of the anoma-lies in this area might contain the messages from the source. To the end, we also discuss the monitoring ability of the observational network for earthquake precursors in Beijing a rea.

Key words: Characteristics, Precursory anomaly, Monitoring ability, Observational network