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前言海底地震学领域里仪器的进展导致了对海底岩石圈结构的重要发现,使用洋底地震仪的远射爆破试验的实际可行性已经作了报道(Asada和Shimamura,1976、1979;Asada等,1983)。从1974到1979年在西太平洋地区进行了称为远射爆破—1到远射爆破—5的五次长距离爆破试验,其结果揭示了西北太平洋盆地和东马里亚纳群岛盆地之间的速度结构和Q值结构有区域性的差别。根据天然地震资料同样也提出了大规模的速度各向异性(Shimamura和Asada,1983).应用地震体波对海底岩石圈进行探测也表明洋底岩石圈在结构上是相当复杂的。这种探测不可避免地要采用宽方位角地震剖面的覆盖。
Introduction Advances in instrumentation in the seabed seismology have led to the discovery of submarine lithospheric structures that have been reported to be practicable by long shot blasting tests using ocean bottom seismometers (Asada and Shimamura 1976, 1979; Asada et al. 1983). Five long-range blasting tests, known as long-range blasting -1 to long-range blasting-5, were conducted in the Western Pacific from 1974 to 1979 and the results revealed the speed between the Northwest Pacific Basin and the East Mariana Basin There is a regional difference between structure and Q value structure. Large-scale velocity anisotropy has also been proposed based on natural seismic data (Shimamura and Asada, 1983). The exploration of seabed lithosphere using seismic body waves also shows that the ocean floor lithosphere is structurally quite complex. This detection inevitably uses wide azimuth seismic section coverage.