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Title: Surface wave group velocity in the Osaka sedimentary basin, Japan, estimated using ambient noise cross-correlation functions
Authors: Asano, Kimiyuki  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-8530-4198 (unconfirmed)
Iwata, Tomotaka  kyouindb  KAKEN_id
Sekiguchi, Haruko  kyouindb  KAKEN_id
Somei, Kazuhiro
Miyakoshi, Ken
Aoi, Shin
Kunugi, Takashi
Author's alias: 浅野, 公之
岩田, 知孝
関口, 春子
染井, 一寛
宮腰, 研
青井, 真
㓛刀, 卓
Keywords: Osaka sedimentary basin
Velocity structure model
Seismic interferometry
Surface wave
Group velocity
Issue Date: 15-Aug-2017
Publisher: Springer Nature
Journal title: Earth, Planets and Space
Volume: 69
Thesis number: 108
Abstract: Inter-station cross-correlation functions estimated using continuous ambient noise or microtremor records were used to extract the seismic wave propagation characteristics of the Osaka sedimentary basin, Japan. Temporary continuous observations were conducted at 15 sites in the Osaka basin between 2011 and 2013. The data were analyzed using seismic interferometry. The target period range was 2–8 s. Cross-correlations between all of the possible station pairs were calculated and stacked to produce a year-long data set, and Rayleigh wave signals in the vertical and radial components and Love wave signals in the transverse component were identified from the results. Simulation of inter-station Green’s functions using the finite difference method was conducted to check the performance of the current three-dimensional velocity structure model. The measured time lag between the observed and theoretical Green’s functions was less than 2 s for most station pairs, which is less than the wave period of interest in the target frequency range. Group velocity tomography was applied to group delay times estimated by means of multiple filter analysis. The estimated group velocities for longer periods of 5–8 s exhibited spatial variation within the basin, which is consistent with the bedrock depth distribution; however, the group velocities for shorter periods of 2–3 s were almost constant over the studied area. The waveform and group velocity information obtained by seismic interferometry analysis can be useful for future reconstruction of a three-dimensional velocity structure model in the Osaka basin.
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/2433/226808
DOI(Published Version): 10.1186/s40623-017-0694-3
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