南海西南次海盆海底地震仪天然地震观测及ScS波分裂
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摘要
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.
引文
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