P‐Delays from Floating Seismometers (MERMAID), Part I: Data Processing
P‐Delays from Floating Seismometers (MERMAID), Part I: Data Processing
复制标题
浮动地震计 (MERMAID) 的 P-延迟，第一部分：数据处理
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Y. Hello
中科院分区：
文献类型：
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作者：
C. Joubert;G. Nolet;S. Bonnieux;A. Deschamps;J. Dessa;Y. Hello
我们目前的数据分析方法，适用于移动的地震记录仪在海洋地区的独立潜水员（MERMAID）地震图，获得与水听器安装在移动的水下浮子。如果MERMAID浮标在记录地震信号后立即到达地面，则通过对浮标的地面漂移进行校正，从第一个全球定位系统（GPS）位置获得地震图位置。如果记录的地震没有立即浮出水面，则使用GPS位置之间的线性插值来估计位置。我们对GPS位置进行Bezier插值以估计位置误差。在67%的情况下，两个轨迹之间的距离小于500米。我们测试了六个月的数据在利古里亚盆地（地中海）的方法。为了验证P波（手动）拾取的起始时间，我们在利古里亚盆地的MERMAID数据下进行了初步层析成像反演，并从附近的陆地和海底地震计站采集了大量数据。反演后，我们发现67%的MERMAID数据的失配在±0.17 s之间，但失配的分布不是高斯分布，而是异常值。我们的结论是，浮动地震仪是一个很好的和准确的手段，覆盖海洋地区的P波层析成像。
We present methods of data analysis adapted to Mobile Earthquake Recorder in Marine Areas by Independent Divers (MERMAID) seismograms, obtained with hydrophones mounted on moving underwater floats. If the MERMAID float comes immediately to the surface after recording an earthquake signal, the seismogram location is obtained from the first Global Positioning System (GPS) position, using a correction for the surface drift of the float. In the case of earthquakes recorded without an immediate surfacing, the location is estimated using a linear interpolation between GPS positions. We performed a Bezier interpolation of the GPS positions to estimate a location error. In 67% of the cases, the distance between the two trajectories was less than 500 m. We tested the method on six months of data acquired in the Ligurian basin (Mediterranean Sea). To validate the (manually) picked onset times for P waves, we performed a preliminary tomographic inversion beneath the Ligurian basin of MERMAID data together with a much larger volume of picks from nearby land and ocean‐bottom seismometer stations. After inversion we found that 67% of MERMAID data have a misfit between ±0.17 s, but the distribution of misfits is not Gaussian and shows outliers. We conclude that floating seismometers are an excellent and accurate means for covering oceanic areas for P‐wave tomography.
非洲/伊比利亚碰撞带下方上地幔的多频断层扫描
影响因子：
2.8
作者：
Bonnin;Villasenor;Gallart;Thomas
通讯作者：
Thomas