反投影远震P波记录法在1996年丽江7.0级地震破裂过程中的运用

摘要

选取1996年丽江7.0级地震27个台站的地震记录,运用反投影远震P波记录法对该次地震的破裂过程进行研究.结果显示丽江7.0级地震震源破裂主要沿北南向的玉龙雪山东麓断裂发展,震源破裂时间约为30 s,空间破裂尺度约40km.表明反投影远震P波记录法能在震后较短时间内得到震源破裂过程,可为地震速报工作提供重要补充,从而为震后应急救援工作提供依据.%Selecting waveforms recorded by 27 stations and using back-projection of teleseismic P-waves method, we study the source rupture process of the Lijiang M7.0 earthquake in 1996. The results show that the energy of source rupture of Lijiang M7. 0 earthquake mainly releases along north-westward Eastern Piedmont Fault of Yu-long Snow Mountain. The total rupture time is about 30 sec, and the rupture length is about 40 km. This method can obtain the source rupture process in short time after the earthquake occurred, it can be an important addition to earthquake rapid report and provides basis for the earthquake rapid response and rescue.