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地震 ›› 2013, Vol. 33 ›› Issue (1): 111-118.

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地震力标度及其在华北地区的应用

王鹏, 郑建常   

  1. 山东省地震局, 山东 济南, 250014
  • 收稿日期:2012-05-22 修回日期:2012-07-17 出版日期:2013-01-31 发布日期:2020-10-16
  • 作者简介:王鹏(1983-),男,山东东营人,2006年获硕士学位,主要从事地震活动性等研究。
  • 基金资助:
    国家科技支撑计划(2012BAK19B04-01-05)、山东省地震局重点科研基金(JJ1205Y)和山东省自然基金(ZR2010DM008)共同资助

Seismic Force Scale and its Application in North China

WANG Peng, ZHENG jian-chang   

  1. Earthquake Administration of Shandong Province, Jinan 250014, China
  • Received:2012-05-22 Revised:2012-07-17 Online:2013-01-31 Published:2020-10-16

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摘要： 讨论了华北地区中强地震前地震力标度的时空变化特征, 首先介绍了地震力标度的物理意义, 给出了由传统经验公式推导出的地震力标度σ值的计算方法, σ值是一个表征地震时震源处断层平均驱动力的物理量, 基于地震波能量推导得到, 介于地震频度和能量之间, 根据经典通用的经验公式, 地震力标度σ值与震级ML存在lgσ=1.14ML+6.22标度关系; 结合华北地区(34°~42°N ; 110°~124°E; )地震活动的特点, 利用1980年以来2500多次3级以上地震, 研究了MS≥5.0中强震前σ值的变化规律, 结果发现该指标能客观反映地震活动的增强与平静。 中强地震前存在σ值高值异常, σ值有由低转高, 在高值点发震的特征。 空间上σ值的分布与地质构造、 地震带和强震孕育过程有关, 中强震前地震力标度σ值有成片增加的过程, 对中强地震预测有一定的指导意义。

关键词: 地震力标度σ值, 地震预测, 华北地区

Abstract: We discussed variation of seismic force scale in time and space before moderately strong earthquakes in North China. We first introduced the physical meaning of seismic force scale (σ value) and its calculation method has been derived by the traditional empirical formula. Based on seismic wave energy, σ value is a physical quantities of average driving force in the seismic source at the fault, which is between earthquake frequency and energy. It is derived that the seismic force scale σ value and magnitude can be described as the relation of lgσ=1.14ML+6.22. Combined with the seismic activity characteristics in north China (34°~42°N; 110°~124°E), using more than 2500 3,0 earthquakes, and σ value variations before MS≥5.0 earthquakes then are studied. It is found that this indicator can objectively reflect the enhanced and calm of seismic activity, with high σ value before moderately strong earthquakes. Spatial characteristics are related to geological structure, seismic zone and strong earthquake preparation process, earthquake force scale σ value has the characteristics of extensive increasing process.

Key words: Earthquake force scale, value, Earthquake prediction, North China

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