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Title: Along‐dip variation in seismic radiation of the 2011 Ibaraki‐oki, Japan, earthquake ( M w 7.9) inferred using a multiple‐period‐band source inversion approach
Authors: Kubo, Hisahiko
Asano, Kimiyuki
Iwata, Tomotaka
Aoi, Shin
Author's alias: 久保, 久彦
浅野, 公之
岩田, 知孝
青井, 真
Keywords: along‐dip variation in seismic radiation
large interplate earthquake
multiple‐period‐band source inversion approach
the 2011 Ibaraki‐oki earthquake
Issue Date: Oct-2020
Publisher: American Geophysical Union (AGU)
Journal title: Journal of Geophysical Research: Solid Earth
Volume: 125
Issue: 10
Thesis number: e2020JB019936
Abstract: To elucidate the spatial variation in period‐dependent seismic radiation for the 2011 Ibaraki‐oki earthquake (Mw 7.9) in Japan, we applied a multiple‐period‐band source inversion approach to near‐source strong‐motion waveforms of this earthquake. We estimated source models of this earthquake in three successive period bands (5–10, 10–25, and 25–50 s) using strong‐motion data and Green's functions based on a 3‐D velocity structure model. The source models in the period bands of 10–25 and 25–50 s had large slips in the area to the south and southeast of the hypocenter in the depth range of 23–35 km, while the large slip area for the source model in the period band of 5–10 s was located in the deeper region ~30 km west of the hypocenter in the depth range of 35–45 km. These results indicate that long‐period (10–25 and 25–50 s) and short‐period (5–10 s) seismic waves were predominantly radiated from these different regions along the dip direction during the 2011 Ibaraki‐oki earthquake. This along‐dip variation in the dominant period of seismic radiation can be explained by the variation in scale in unstable sliding patches according to depth.
Rights: An edited version of this paper was published by AGU. Copyright 2020 American Geophysical Union.
The full-text file will be made open to the public on 30 March 2021 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.
DOI(Published Version): 10.1029/2020JB019936
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