珠江口外潜在强震区海陆地震联测的初步结果

Preliminary results of onshore-offshore seismic experiments in a potential strong earthquake area off the Pearl River Estuary

海陆地震联测是研究海陆过渡带深部地壳结构的有效的地球物理方法。为了研究珠江口外潜在强震区的深部发震构造,对比分析了2004年和2010年珠江口外海陆地震联测的数据特征,重点对2010年海陆地震联测实验的OBS2010-1测线进行分析。通过对该测线采集数据的初步分析可知,此次实验数据质量较高且完善性好,多道地震探测获得了清晰的浅部结构,固定地震台、流动地震台和海底地震仪记录的震相信息丰富,固定台接收气枪信号的最远接收距离约为360km,为研究该潜在强震区的深部发震构造打下了良好的基础。

An onshore-offshore seismic experiment is the most effective method to study the deep crustal structure of land-ocean transitional area.In order to study the deep seismogenic structure of potential strong earthquake zone off the Pearl River Estuary,this paper compares the data of onshore-offshore seismic experiments off the Pearl River Estuary in 2004 and 2010,with emphasis placed on analyzing the profile OBS2010-1 located at the land-ocean transitional area off the Dangan Islands.The data-processing of the profile gives high-quality data.We obtained clear shallow-crustal structure from multi-channel seismic data.Various seismic phases were recorded by permanent seismic stations,portable seismic stations, and Ocean Bottom Seismometers.The permanent seismic stations received air-gun signals over a distance of 360 km.All these provide a strong base for the study of deep seismogenic structure of the potential strong earthquake zone for future research.