Crustal Structure and tectonic attribute Revealed by a Deep Seismic Sounding Profile of Dinghu-Gaoming-Jinwan in the Pearl River Delta
<p>To find out the crustal structure and&#160; tectonic attribute&#160; of the Pearl river delta and offshore area(PRD), in 2015, the Guangdong Earthquake Agency collaboration&#160;with the&#160;other&#160;unit &#160;carried out a three-dimensional joint onshore-offshore seismic detection&#160; experiment in the PRD. &#160;This paper processed the data of Dinghu-Gaoming-Jinwan L1 line on the west side of PDR. We utilized ray tracing and travel-time simulation&#160; method to obtained a P-wave velocity model of the L1 profile.The study showed: Along the profile, The depth of the Moho gradually decreases from the northwestern inland 30.0km to the southwestern coastal 28.0km. Upheaval&#160;&#160;of the&#160;Moho is between Dinghu and Gaoming. The low velocity&#160;layer in the mid-crustal &#160;is &#160;a&#160;heterogeneous&#160;continuum. The velocity of low velocity layer NW side is lower than the SE side, especially between Dinghu and Gaoming. The minimum velocity is 6.05km&#8226;s<sup>-1</sup>. The deep Wuchuan-Sihui fault and Guangzhou-Enping fault &#160;may be one of the most important channels for deep material upwelling. It is the continuum upheaval&#160;&#160;of the&#160;Moho which from Dinghu, Gaoming on the west side of PDR to &#160;Qingyuan, Conghua on the east side of PDR delimited by Wuchuan-Sihui fault and Guangzhou-Enping fault.</p>