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简要介绍了南海西南次海盆OBS3D地震探测台阵,整理并详细分析了宽频带OBS的天然地震记录,结果表明共记录了Ms6.0～6.9地震93个,Ms7.0以上地震10个,数据质量较好,特别是2011年3月11日日本仙台以东海域发生的Ms9.0大地震.对4次Ms7.0以上地震的ScS波进行了各向异性反演,结果表明西南次海盆的快S波偏振方向N58°E平行于已停止活动的扩张脊(慢波方向S35°E垂直于扩张轴),说明西南次海盆的扩张脊现今处于挤压应力状态,反映了南海南部边缘的碰撞格局和洋脊停止扩张的动力学原因.
This paper briefly introduces the OBS3D seismic exploration array in the southwest sub-sea basin of the South China Sea. The natural seismic records of broadband OBS are analyzed and analyzed in detail. The results show that a total of 93 Ms6.0 ~ 6.9 earthquakes and 10 Ms7 earthquakes have been recorded. The data quality Especially the Ms9.0 earthquake that occurred to the east of Sendai, Japan, on March 11, 2011. The anisotropic inversion of ScS waves of 4 earthquakes of Ms7.0 and above shows that the SW The polarization direction of S wave is N58 ° E parallel to the discontinuous active ridge (S35 ° E is perpendicular to the extension axis), indicating that the southwest submarine ridge is now under compressive stress and reflects the collision pattern at the southern edge of the South China Sea And the kinetic reasons why the ridge stopped expanding.