摘要
利用陕西省地震台网及邻省地震台的Ｐ波初动资料求得泾阳ＭＳ４．８ 地震的震源机制解。其节面Ⅰ应为该次地震的主破裂面，渭河断裂为发震断裂；主应力方向与华北地区应力场的方向一致，说明地震受华北区域应力场的控制，与华北地区进入新的地震活跃期相应，可能预示陕西关中地区地震活动性将有所增强。泾阳地震震中区是莫霍面等深线梯度急剧变化的地段，也是铜川。
According to the data of P wave first motion observed by the seismological network in Shaanxi and the seismostations in neighbouring provinces,the focal mechanism solution of the Jingyang M\-S 4.8 earthquake is calculated.From the result it is inferred that Plane Ⅰ is the main rupture plane of the quake and the Weihe fault is the seismogenic fault.The direction of the principal stress is uniformed with that of the stress field in North China,which shows that the earthquake is controlled by the regional stress field in North China,in answer to the new actively seismic period in this area.This may seem to mean that the seismicity in Guanzhong,Shaanxi will have an increase.The epicenter area of Jingyang earthquake is both the section where the gradient of Moho bathymetric lines changes sharply and the marginal section of P wave and S wave high speed zone in Tongchuan and Yaoxian, and it is the crustral high value anomaly area of V\-P/V\-S.
出处
《内陆地震》
1999年第1期25-31,共7页
Inland Earthquake
关键词
地震活动性
震源机制
发震断裂
地震地质
Seismicity\ Focal mechanism\ Seismogenic fault\ Seismogeology\ Jingyang earthquake
