【摘要】 大连地震台在实测中,经常观测到来自菲律宾—印度尼西亚东部一带的地震S波较理论到时提前约数秒到达。2002年至2011年,记录到该地区145例具有此种显著异常的震例。该现象与台基无关,全国地区均可观测到。震例分析发现,可观测到该现象与未观测到明显异常的台站在全球范围内大致呈四象限分布,造成该异常现象的原因可能与震源过程有关。更多还原

【Abstract】 In the observation of earthquakes from the Philippines-eastern Indonesia area in Dalian Seismic Station,the S-waves often arrived several seconds ahead of the theoretical arriving time.Waves from this area observed by Dalian Seismic Station from 2002 to 2011 were collected,from which 145 cases with anomalous travel time of S-waves were selected.This phenomenon is unrelated with the base;the whole country areas can observe the anomaly.The stations that can or not observe this phenomenon distributed in a four-quadrant pattern on the Earth.It is suggested that the origin of this phenomenon should be related with the source process.更多还原