台湾海峡深地震探测:HX9测线试验及初步成果

Deep seismic exploration in the Taiwan Strait: the experiment of HX9 survey line and preliminary results

利用海上大容量气枪震源、陆上地震台站（包括流动台站和固定台站）和海底地震仪首次在台湾海峡地区开展了深地震探测试验。试验结果表明,＂延平2号＂科考船气枪枪阵信号最远传播距离达280km,成功获得了数万道高质量的地震数据,并且识别了不同类型的P波震相。HX9剖面一维地壳结构模型表明,由2个速度间断面产生的Pc及Pm P两组反射波和基底折射波（Pg）所反映的地壳结构构成了该区基本的地壳结构特征,康拉德界面和莫霍界面的深度分别为16.0~17.5、28.0~29.5km。

By using marine large volume air-gun seismic source and land seismic stations（ including mobile stations and permanent stations） and Ocean Bottom Seismometers,a deep seismic exploration experiment was carried out for the first time in the Taiwan Strait. Experiment result showed the seismic stations could receive the seismic signals from the air-gun arrays of the＂YANPING 2＂science investigation ship as far as 280 km away. Tens of thousands of high quality seismic data were obtained successfully and different types of P-wave seismic phases were identified. A one dimensional crustal structure model about HX9 section shows that the crustal structure which is reflected by Pc and Pm P reflection wave from two velocity discontinuity surfaces and basement refraction wave（ Pg） constitutes the basic characteristic of the crustal structure in this region. The depth of Conrad discontinuity and Moho discontinuity is respectively 16. 0 ~17. 5km and 28. 0 ~ 29. 5km.