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Title: Source model for strong ground motion generation in the frequency range 0.1–10 Hz during the 2011 Tohoku earthquake
Authors: Asano, Kimiyuki  kyouindb  KAKEN_id  orcid (unconfirmed)
Iwata, Tomotaka  kyouindb  KAKEN_id
Author's alias: 浅野, 公之
岩田, 知孝
Keywords: 2011 Tohoku earthquake
source model
strong motion generation area
empirical Green’s function method
broadband strong ground motion simulation
Issue Date: Dec-2012
Publisher: Springer Nature
Journal title: Earth, Planets and Space
Volume: 64
Start page: 1111
End page: 1123
Abstract: The source model of the 2011 Tohoku earthquake, which is composed of four strong motion generation areas (SMGAs), is estimated based on the broadband strong ground motion simulations in the frequency range 0.1–10 Hz using the empirical Green’s function method. Two strong motion generation areas are identified in the Miyagi-oki region west of the hypocenter. Another two strong motion generation areas are located in the Fukushima-oki region southwest of the hypocenter. The strong ground motions in the frequency range 0.1–10 Hz along the Pacific coast are mainly controlled by these SMGAs. All the strong motion generation areas exist in the deeper portion of the source fault plane. The stress drops of the four SMGAs range from 6.6 to 27.8 MPa, which are similar to estimations for past M 7-class events occurring in this region. Compared with the slip models and aftershock distributions of past interplate earthquakes in the Miyagi-oki and Fukushima-oki regions since the 1930s, the SMGAs of the 2011 Tohoku earthquake spatially correspond to the asperities of M 7-class events in 1930s. In terms of broadband strong ground motions, the 2011 Tohoku earthquake is not only a tsunamigenic event with a huge coseismic slip near the trench but is also a complex event simultaneously rupturing pre-existing asperities.
Rights: This article is published under an open access license. Please check the 'Copyright Information' section either on this page or in the PDF for details of this license and what re-use is permitted.
DOI(Published Version): 10.5047/eps.2012.05.003
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