Displacement Above the Hypocenter of the 2011 Tohoku-Oki Earthquake
2011; American Association for the Advancement of Science; Volume: 332; Issue: 6036 Linguagem: Inglês
10.1126/science.1207401
ISSN1095-9203
AutoresMariko Sato, Tadashi Ishikawa, Naoto Ujihara, Shigeru Yoshida, Masayuki Fujita, Masashi Mochizuki, Akira Asada,
Tópico(s)Earthquake Detection and Analysis
ResumoThe 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 the focal region. An area with more than 20 meters of horizontal displacement, that is, four times larger than those detected on land, stretches several tens of kilometers long along the trench; the largest amount reaches about 24 meters toward east-southeast just above the hypocenter. Furthermore, nearly 3 meters of vertical uplift occurred, contrary to observed terrestrial subsidence.
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