Combination of Least Square and Monte Carlo Methods for OBS Relocation in 3D Seismic Survey Near Bashi Channel
Combination of Least Square and Monte Carlo Methods for OBS Relocation in 3D Seismic Survey Near Bashi Channel
复制标题
巴士海峡附近三维地震勘探OBS重定位中最小二乘法与蒙特卡罗法相结合
DOI：
10.1080/01490419.2018.1479993
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发表时间：
2018-09
期刊：
影响因子：
1.6
通讯作者：
Qiu Xuelin
中科院分区：
文献类型：
--
作者：
Du Feng;Zhang Jiazheng;Yang Fudong;Zhao Minghui;Wang Qiang;Qiu Xuelin
摘要海底地震仪的定位是分析地壳、地幔三维地震层析结构的关键步骤。为了准确定位气枪在海底的位置，分析了气枪发射的直达水波的传播时间。采用蒙特卡罗和最小二乘法计算了OBS的真实位置。如果直接水波的到达在重新定位过程中表现出整体的时间漂移，则需要进行二次时间改正，这可能源于线性时钟漂移校正的残余和走时拾取的平均误差、平均水速假设和实验几何形状。我们改进了以前用于其他实验的原始OBS重新定位过程，考虑了二次时间修正，并自动逼近真实平均水速。首先进行了一系列的合成测试，以证明该方法的可行性，然后将其应用于真实的实验。在这里，我们在巴什海峡附近的三维地震勘探中共搬迁了28个OBS。搬迁结果显示，根据搬迁结果推算出的28个OBSS的漂移距离，由部署地点与搬迁地点之间的距离由65米至1136米不等。OBS漂移方向与海流方向的皮尔逊相关系数为0.79，表明两组数据高度线性相关，进一步表明海流是OBS在海底着陆时漂移的最有可能的驱动力，但其具体影响机制目前尚不清楚。这项研究对速度结构模拟是必要的和关键的，优化的重新定位方案为其他地区的三维地震勘探提供了宝贵的经验。
Abstract 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 1136 m 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.
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影响因子：
34.7
作者：
R. Llinás
通讯作者：
R. Llinás
DOI：
10.1002/cjg2.1577
发表时间：
2010-11
期刊：
Chinese Journal of Geophysics
影响因子：
--
作者：
W. Ao;Minghui Zhao;X. Qiu;Jiabiao Li;A. Ruan;Li Shoujun;Jiazheng Zhang
通讯作者：
W. Ao;Minghui Zhao;X. Qiu;Jiabiao Li;A. Ruan;Li Shoujun;Jiazheng Zhang
影响因子：
2.8
作者：
S. Kodaira;Martin Bellenberg;T. Iwasaki;T. Kanazawa;H. B. Hirschleber;H. Shimamura
通讯作者：
S. Kodaira;Martin Bellenberg;T. Iwasaki;T. Kanazawa;H. B. Hirschleber;H. Shimamura
影响因子：
2.9
作者：
S. Yelisetti;G. Spence;M. Scherwath;M. Riedel;D. Klaeschen
通讯作者：
S. Yelisetti;G. Spence;M. Scherwath;M. Riedel;D. Klaeschen
影响因子：
2.4
作者：
Dunn, Robert A.;Hernandez, Olga
通讯作者：
Hernandez, Olga