Damage Tensor Analysis on Regional Seismic Status

作     者：Zhong Jimao Cheng Wanzheng 

作者机构：Earthquake Administration of Fujian Province Fuzhou 350003 China Earthquake Administration of Sichuan Province Chengdu 610041 China 

出 版 物：《Earthquake Research in China》 (中国地震研究（英文版）)

年 卷 期：2006年第20卷第3期

页      面：339-350页

学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学] 

基　　金：This research was supported by the Joint EarthquakeScience Foundation,CEA(105004) the 10th Five-Year Program of Research on Short-term Strong EarthquakeForecast and Disaster Relieving Technology (2004BA601B01-02) 

主　　题：Damage tensor Damage degree Earthquake status 

摘      要：In this paper, we researched the regional seismic status by using theories of the Damage Mechanics. The macroscopic damage status of the earth crust block, which is caused by earthquake fracture, is described with several concepts—the damage degree, the damage rate and the strain rate. In the earthquake process, the average strain rate of the studied block is equal to the sum of all seismic moment tensors of the earthquakes taking place in unit time and physical volume. To describe the anisotropy of microdamage of the crust block, we use the damage tensor that is expressed in the fissure density. By means of the transformation from the focal coordinate system to the observation system, we obtained the external normal vector of the focal fault plane expressed in its observation system and obtained the macrodamage degree of the researched block, which is calculated in dyadic. This provides a new analysis method for recognizing the underground damage status and the stress status.