Interplate fault slip along the Japan Trench before the occurrence of the 2011 off the Pacific coast of Tohoku Earthquake as inferred from GPS data

• Published in: Earth, planets, and space Vol. 63; no. 7; pp. 615 - 619
• Main Authors: Suito, Hisashi, Nishimura, Takuya, Tobita, Mikio, Imakiire, Tetsuro, Ozawa, Shinzaburo
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.01.2011; Springer Nature B.V
• Subjects: Coastal environments; Deformation; Earth and Environmental Science; Earth Sciences; Geographic information systems; Geology; Geophysics/Geodesy; Global Positioning System; Letter; Satellite navigation systems; Seismic phenomena; Slip; Trenches; Interplate fault slip; postseismic deformation; the 2011 off the Pacific coast of Tohoku Earthquake; pre-seismic signal; the Japan Trench
• ISSN: 1343-8832; 1880-5981
• DOI: 10.5047/eps.2011.06.053

A sequence of M 7-class interplate earthquakes and transient postseismic slips following each of these earthquakes occurred along the Japan Trench before the occurrence of the giant earthquake on March 11, 2011. Continuous GPS data detected a significant postseismic deformation with displacements that were much larger than that of the coseismic offset. Moreover, the geodetic inversion results using these observations revealed that the total moment released by these transient slips was much larger than the coseismic ones. This differs from our understanding of the postseismic process that the postseismic deformation and slip are smaller than the coseismic ones. These transient processes may help us understand not only the postseismic process but also the pre-seismic signals indicating the occurrence of the giant earthquake.