Displacement Above the Hypocenter of the 2011 Tohoku-Oki Earthquake
作者： M. Sato , T. Ishikawa , N. Ujihara , S. Yoshida , M. Fujita
关键词: Subsidence 、 Displacement (vector) 、 Global Positioning System 、 Geology 、 Injury control 、 Seismology 、 Moment magnitude scale 、 Poison control 、 Trench 、 Hypocenter
摘要: The moment magnitude (M(w)) = 9.0 2011 Tohoku-Oki mega-thrust earthquake occurred off the coast of northeastern Japan. Combining Global Positioning System (GPS) and acoustic data, we detected very large sea-floor movements associated with this event directly above focal region. An area more than 20 meters horizontal displacement, that is, four times larger those on land, stretches several tens kilometers long along trench; largest amount reaches about 24 toward east-southeast just hypocenter. Furthermore, nearly 3 vertical uplift occurred, contrary to observed terrestrial subsidence.
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