Gravitational seismology retrieving Centroid-Moment-Tensor solution of the 2011 Tohoku earthquake
Gravitational seismology retrieving Centroid-Moment-Tensor solution of the 2011 Tohoku earthquake
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DOI：
10.1029/2012jb009555
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发表时间：
2013-01-01
影响因子：
3.9
通讯作者：
Sabadini, Roberto
中科院分区：
文献类型：
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作者：
Cambiotti, Gabriele;Sabadini, Roberto
大地震引起的地壳和岩石圈地幔内的质量重排和海水的重新分配可以通过它们的同震重力信号来观察到，现在可以通过重力恢复和气候实验(GRACE)空间任务探测到。在这里，我们提出了一种新的方法来估计主要震源参数(震源和力矩张量)，该方法完全依赖于GRACE的空间重力数据，该数据首次应用于2011年东北地震。得到了与逆冲地震和俯冲带地质信息相一致的震源模型。它与基于远震波反演的全球质心-矩-张量计划解非常相似，尽管矩震级更高(9.13+/-0.11比9.08)，而且震源在大洋板块内更远的近海约40公里。这一过程将成为地震学中的一个重要工具，因为它通过利用GRACE新的重力数据来补充质心矩张量分析。引文：Cambiotti，G.和R.Sabadini(2013)，重力地震学检索2011年东北地震的质心矩-张量解，J.地球物理。报告：Solid Earth，118183194，DOI：10.1029/2012JB009555。
Mass rearrangement within the crust and lithospheric mantle and ocean water redistribution caused by great earthquakes are made visible by their coseismic gravity signature, nowadays detectable by the Gravity Recovery And Climate Experiment (GRACE) space mission. Here we present a novel procedure for estimating the principal seismic source parameters (hypocenter and moment tensor) that relies solely on space gravity data from GRACE, applied for the first time to the 2011 Tohoku earthquake. It yields a seismic source model that is consistent with a thrust earthquake and geological information of the subduction zone. It closely resembles the Global Centroid-Moment-Tensor Project solution based on the teleseismic wave inversion, although the moment magnitude is higher (9.13 +/- 0.11 compared to 9.08) and the hypocenter is further offshore by about 40 km, within the oceanic plate. This procedure will become an important tool in seismology as it complements Centroid-Moment-Tensor analysis by exploiting the new gravity data from GRACE. Citation: Cambiotti, G., and R. Sabadini (2013), Gravitational seismology retrieving Centroid-Moment-Tensor solution of the 2011 Tohoku earthquake, J. Geophys. Res. Solid Earth, 118, 183-194, doi: 10.1029/2012JB009555.