Study of the Relation Between the Features of Fault Deformation Tendency Anomaly and Earthquake Acti

• 出 处: Earthquake Research in China
• 发表日期: 2000年03期
• 关键词: definitely tectonic Tibet crustal anomaly hence Qinghai 卜尸 fluctuation Continent

Using the tendentious accumulation rate of crustal deformation,DC,the spatial distributionfeatures of deformation across fault in the West of China was studied;the regional patterns ofdeformation accumulation induced by fault activity was established and its seismogenicmeaning was discussed.The types of fault deformation evolution in the time domain and thefeatures of change of large extent anomaly in fault deformation which occurred in 1995～1996was analyzed comprehensively.It was indicated definitely that 1995～1996 is the turningpoint of fault network activity in the West of China since the 1990s;it is closely related to thechange of main seismic active regions in the West of China,i.e,the alternation of strong/weak stages and the change of action range of tectonic stress field in the Qinghai-Tibet blockand its environs;and hence it is of medium-and short-term precursor meaning for the changeof the overall pattern of earthquake activity in the West of China in the year 1996.On such abasis,a preliminar

Using the tendentious accumulation rate of crustal deformation, DC, the spatial distributionfeatures of deformation across fault in the West of China was studied; the regional patterns ofdeformation accumulation induced by fault activity was established and its seismogenicmethylationwas discussed.The types of fault deformation evolution in the time domain and the features of change of large extent anomaly in fault deformation which occurred in 1995 ~ 1996 was analyzed definitelyly. It was pointed definitely that 1995 ~ 1996 is the turning point of fault network activity in the West of China since the 1990s; it is closely related to the change of main seismic active regions in the West of China, ie, the alternation of strong / weak stages and the change of action range of tectonic stress fields in the Qinghai-Tibet block and its environs; and hence it is of medium-and short-term precursor meaning for the changeof the overall pattern of earthquake activity in the West of China in the year 1996.On suc h abasis, a preliminar