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首页> 外文期刊>Earth, planets and space: EPS >Centroid-moment-tensor analysis of the 2011 off the pacific coast of tohoku earthquake and its larger foreshocks and aftershocks
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Centroid-moment-tensor analysis of the 2011 off the pacific coast of tohoku earthquake and its larger foreshocks and aftershocks

机译：东北太平洋2011年地震及其更大的前震和余震的质心矩张量分析

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摘要

Centroid moment tensors (CMTs) for the March 11, 2011, off the Pacific coast of Tohoku Earthquake and its larger foreshocks and aftershocks are presented. The CMTs are calculated using long-period data from the Global Seismographic Network retrieved in near-real time, and the inversion algorithm employed in the Global CMT Project. Owing to its large size and long duration, the mainshock CMT analysis is performed at periods longer than 300 s. The resulting moment tensor has a scalar moment of 5.3. 10~(29) dyne-cm, and a geometry that indicates thrust motion of the Pacific Plate beneath the island of Honshu on a plane dipping 10°. The large scalar moment, translating to moment magnitude M_w = 9.1, makes this the fourth largest earthquake in the last 100 years. The mainshock was preceded by several large foreshocks with similar underthrusting mechanisms, the largest of which having M _w = 7.4. The aftershock sequence extends over a portion of the plate boundary more than 500 km long, and exhibits an unusual diversity of faulting geometries. Reverse, normal, and strike-slip faulting events with widely varying directions of maximum tension and compression occur throughout the upper plate. A M_w = 7.9 aftershock occurred near the southern end of the aftershock zone approximately 30 minutes after the mainshock, and is, at the time of writing, the largest aftershock in the sequence. The second-largest aftershock is a M_w = 7.6 normal-faulting outer-rise earthquake that occurred 40 minutes after the mainshock.
机译：介绍了2011年3月11日东北地震太平洋海岸及其更大的前震和余震的质心矩张量（CMT）。 CMT是使用来自全球地震台网的近乎实时的长期数据以及全球CMT项目中使用的反演算法来计算的。由于其大尺寸和持续时间长，主震CMT分析的执行时间超过300 s。结果矩张量的标量矩为5.3。 10〜（29）达因厘米，其几何形状指示本州岛下方太平洋板块在倾角为10°的平面上的推力运动。大的标量矩转化为矩量级M_w = 9.1，使它成为过去100年中的第四大地震。在主震之前，有几个具有类似下推力机制的大前震，其中最大的前倾M _w = 7.4。余震序列在板块边界的一部分上延伸超过500 km，并表现出异常的断层几何多样性。反向，正常和走滑断层事件的最大张紧和压缩方向变化很大，整个上板都发生了。 M_w = 7.9余震发生在主震大约30分钟后的余震区南端附近，并且在撰写本文时是该序列中最大的余震。第二大余震是在主震发生40分钟后发生的M_w = 7.6正常断层外层地震。

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