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Title: Which is heterogeneous, stress or strength? An estimation from high-density seismic observations
Authors: Iio, Yoshihisa  kyouindb  KAKEN_id
Yoneda, Itaru
Sawada, Masayo
Miura, Tsutomu
Katao, Hiroshi
Takada, Yoichiro
Omura, Kentaro
Horiuchi, Shigeki
Author's alias: 飯尾, 能久
米田, 格
澤田, 麻沙代
三浦, 勉
片尾, 浩
Keywords: Stress
Heterogeneity
Fault strength
Stress inversion
Focal mechanism
Issue Date: 20-Oct-2017
Publisher: Springer Nature
Journal title: Earth, Planets and Space
Volume: 69
Thesis number: 144
Abstract: Using data from high-density seismic observation networks installed in the western Nagano Prefecture region in Japan, we precisely determined focal mechanisms and estimated the high-resolution stress field at a scale of 1 km. Almost all differences between observed and calculated slip directions (misfit) were smaller than the errors in focal mechanisms at grid points away from the mainshock fault. This finding clearly indicates that the estimated uniform stress suitably explains focal mechanisms in each subregion apart from the mainshock fault. Misfits are relatively large at grid points near the mainshock fault, but many of these misfits are smaller than the errors in focal mechanisms, and stress is regarded as uniform for a greater portion within each subregion. However, we found that focal mechanisms and P-axes varied widely and differed from each other for a short focal distance of 100 m. These results clearly show that stress can be regarded as uniform, but that strength is heterogeneous.
Description: The Correction to this article has been published in Earth, Planets and Space 2018 70:20.
Rights: © The Author(s) 2017. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
URI: http://hdl.handle.net/2433/234588
DOI(Published Version): 10.1186/s40623-017-0730-3
Related Link: https://doi.org/10.1186/s40623-018-0778-8
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