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Source‐rupture process of the 2011 Ibaraki‐oki, Japan, earthquake ( M w 7.9) estimated from the joint inversion of strong‐motion and GPS Data: Relationship with seamount and Philippine Sea Plate
Author(s) -
Kubo Hisahiko,
Asano Kimiyuki,
Iwata Tomotaka
Publication year - 2013
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/grl.50558
Subject(s) - seamount , seismology , geology , subduction , seismic moment , asperity (geotechnical engineering) , slip (aerodynamics) , geodesy , global positioning system , inversion (geology) , tectonics , fault (geology) , oceanography , telecommunications , physics , geotechnical engineering , computer science , thermodynamics
The source‐rupture process of the 2011 Ibaraki‐oki earthquake was estimated from the joint inversion of the strong‐motion and global positioning system (GPS) data. The estimated seismic moment and maximum slip are 7.8 × 10 20 Nm ( M w 7.9) and 6.3 m, respectively. The total rupture duration is approximately 30 s. The derived source model has one large slip area, which is surrounded by the subducted seamount and the northeastern edge of the Philippine Sea plate. From this model, we concluded that the rupture propagation of the 2011 Ibaraki‐oki earthquake was stopped by the seamount and the Philippine Sea plate. We also showed the possibility of the rupture of this event being the reactivation of the preexisting asperity of an event that occurred in 1923.