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在马尼拉海沟俯冲带前缘开展了二维海底地震仪(OBS)探测实验,布置了一条东西走向的深地震测线——OBS2015-2。以该测线上的2个台站(OBS04和OBS08)为例,阐述了此次实验所用短周期国产OBS的数据处理流程。包括从原始数据到SAC格式、再到SEGY格式的转换;同时包括炮点位置校正和OBS位置校正。数据处理结果表明,OBS2015-2测线的数据质量良好,综合地震剖面显示来自深部的震相(如Ps P、Pg、Pm P等)信息十分清晰。利用Rayinvr软件正演试算,进一步确认了震相类型,特别是来自于输入板块莫霍面的反射震相非常丰富,为马尼拉俯冲带的输入板块地壳底界面的确定提供了重要的数据基础。
A two-dimensional seabed seismograph (OBS) detection experiment was conducted on the leading edge of Manila trench subduction zone with an east-west deep seismic survey line, OBS2015-2. Taking the two stations (OBS04 and OBS08) on the survey line as an example, the data processing flow of short cycle domestic OBS used in this experiment is described. Including the conversion from the raw data to the SAC format to the SEGY format; also includes the gun position correction and OBS position correction. The data processing results show that the data of OBS2015-2 line is of good quality and the comprehensive seismic section shows that the information from the deep seismic facies (such as Ps P, Pg, Pm P, etc.) is very clear. The Rayinvr software was used to conduct a forward trial calculation to further confirm the facies types. In particular, the reflection facies from the Moho surface of the input plate is very rich, which provides an important data foundation for the determination of the crust bottom interface of the input plate in the Manila subduction zone.