Abstract
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 · 1029 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.
Highlights
The great off the Pacific coast of Tohoku Earthquake ofMarch 11, 2011, was one of the largest earthquakes of the past century and the largest well-documented earthquake to strike Japan
The foreshocks and approximately half of the aftershocks show similar faulting geometries, and their locations are generally consistent with rupture on the same plate-boundary fault as the mainshock
The moment tensor and source centroid are estimated by matching observed long-period three-component seismograms to synthetic waveforms calculated by summation of Earth’s normal modes
Summary
The great off the Pacific coast of Tohoku Earthquake ofMarch 11, 2011, was one of the largest earthquakes of the past century and the largest well-documented earthquake to strike Japan. 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 second-largest aftershock is a MW = 7.6 normal-faulting outer-rise earthquake that occurred 40 minutes after the mainshock.
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