松嫩盆地井下摆记录到的地方震地表反射波

The surface reflection wave of local earthquake record by underground seismographs in the Songnen basin

摘要:

地震波在地球表面的反射波PP、SS 由于需经地球表面的一次反射，因此属于远震记录观测到的震相。本文利用井下摆观测数据，对2003 年吉林松原震群和2005 年黑龙江林甸地震震相进行认真研究，根据台站附近的测井资料确定的上地壳速度模型，对选定的地表反射点进行地震波的走时计算，初步判定在特定的震中距内井下摆可以记录到地方震的地球表面反射波。为和远震记录的PP 和SS 震相相区别，本文暂定此震相为PgPg，SgSg。

Abstract:

Seismic waves of PP and SS as earth’s surface reflection wave，as a result of the reflection of the earth’s surface，a seismic phase that can be observed in distant earthquake records． The paper used the underground seismographic data to study seismic phases of the 2003 Songyuan earthquake clusters and 2005 Lindian earthquake records，and calculated the arrived time at the selected surface conducting seismic reflection point with the earth’s crust velocity model at the stations near the logging data． The results show that the underground seismographs in specific epicenter of the local earthquake can record reflection waves on the earth surface． The paper determined the seismic phase as PgPg and SgSg in order to differentiate them from the distance records of PP and SS．