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首页> 外文期刊>Marine Geodesy >Combination of Least Square and Monte Carlo Methods for OBS Relocation in 3D Seismic Survey Near Bashi Channel
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Combination of Least Square and Monte Carlo Methods for OBS Relocation in 3D Seismic Survey Near Bashi Channel

机译：最小二乘和蒙特卡罗方法相结合的巴什海峡3D地震勘探OBS重定位

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摘要

The relocation of ocean bottom seismometers (OBSs) is a key step in analyzing the three-dimensional seismic tomographic structure of crust and mantle. In order to get the accurate location of OBSs on the seafloor, we analyze the travel times of direct water waves emitted by air-guns. The Monte Carlo and least square methods have been adopted to calculate the true OBS location. The secondary time correction is necessary if the arrivals of direct water waves show overall time drift during relocation which maybe originates from remnant of linear clock drift correction and average errors of travel time picking, mean water velocity assumption, and experiment geometry. We have improved the original OBS relocation procedure which we used previously for other experiments by deliberateness of a secondary time correction and automatically approaching the really mean water velocity. A series of synthetic tests are carried out firstly to document the feasibility of our procedure and then it is applied on a real experiment. In here, we relocate 28 OBSs in total were relocated in 3D seismic survey near Bashi Channel. Relocation results show that the drifting distances for the 28 OBSs range from 65 to 1136m between the deployed and relocated locations deduced by relocation results. The Pearson correlation coefficient between OBS drifting direction and sea current direction is 0.79, indicating that the two sets of data are highly linearly related and further manifest the sea current as the most possible driving force for OBS drifting during landing on the seafloor but its detailed influence mechanism is unclear by now. This research is necessary and critical for velocity structure modeling, and the optimal relocation program provides valuable experiences for 3D seismic survey in other area.
机译：海底地震仪（OBS）的重新布置是分析地壳和地幔的三维地震层析成像结构的关键步骤。为了获得OBS在海底的准确位置，我们分析了气枪发射的直接水波的传播时间。已经采用了蒙特卡洛和最小二乘法来计算OBS的真实位置。如果直接水浪的到来表明搬迁期间的整体时间漂移，则可能需要二次时间校正，这可能是由于线性时钟漂移校正的剩余部分以及行进时间选择的平均误差，平均水速假设和实验几何形状引起的。我们通过故意进行二次时间校正并自动接近真正的平均水速，改进了先前用于其他实验的原始OBS重定位程序。首先进行了一系列综合测试，以证明我们程序的可行性，然后将其应用于实际实验中。在这里，我们在Bashi Channel附近的3D地震勘测中总共迁移了28个OBS。搬迁结果表明，根据搬迁结果推算出的28个OBS的部署位置和搬迁位置之间的漂移距离为65至1136m。 OBS漂移方向与海流方向之间的Pearson相关系数为0.79，这表明两组数据高度线性相关，并进一步表明海流是OBS登陆海底时漂移的最可能驱动力，但其详细影响目前机制尚不清楚。这项研究对于速度结构建模是必要的，也是至关重要的，并且最佳的重定位程序为其他地区的3D地震勘探提供了宝贵的经验。

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  • 来源
    《Marine Geodesy》 |2018年第5期|494-515|共22页
  • 作者

    Du Feng; Zhang Jiazheng; Yang Fudong; Zhao Minghui; Wang Qiang; Qiu Xuelin;

  • 作者单位

    South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou, Guangdong, Peoples R China;

    South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou, Guangdong, Peoples R China;

    South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou, Guangdong, Peoples R China;

    South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou, Guangdong, Peoples R China;

    South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou, Guangdong, Peoples R China;

    South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou, Guangdong, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    3D refracted seismic experiment; Bashi Channel; least square method; Monte Carlo method; OBS relocation;

    机译：3D折射地震实验;巴什海峡;最小二乘法;蒙特卡罗方法;OBS重定位;

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