Seismic Force Scale and Its Application in North China
详细信息
- 责任者：Wang Peng (Earthquake Administration of Shandong Province ; Jinan 250014 ; China) ; Zheng Jianchang
- 刊名：Earthquake
- 出版年：2013
- 卷期：33(1)
- 关键词：地震预测 ; earthquake prediction ; 华北地区 ; North China
- 页码：p.111-118
- 图表：illus., 14 refs.
- 分类号：0500
- issnNo：ISSN1000-3274
- isbnNo：CN11-1893/P
摘要
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 2 500 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.