Shallow subsurface structure estimated from dense aftershock records and microtremor observations in Furukawa district, Miyagi, Japan
Hiroyuki Goto 1 6 Hitoshi Mitsunaga 2 Masayuki Inatani 3 Kahori Iiyama 2 Koji Hada 4 Takaaki Ikeda 5 Toshiyasu Takaya 5 Sayaka Kimura 5 Ryohei Akiyama 5 Sumio Sawada 1 Hitoshi Morikawa 2
+ Author Affiliations
- Author Affiliations
1 Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
2 School of Environment and Society, Tokyo Institute of Technology, Nagatsuda 4259, Midori-ku, Yokohama, Kanagawa 226-8503, Japan.
3 Osaki City Office, Furukawa Nanokamachi 1-1, Osaki, Miyagi 989-6188, Japan.
4 NEWJEC, Honjo Higashi 2-3-20, Kita-ku, Osaka 531-0074, Japan.
5 Graduate School of Engineering, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
6 Corresponding author. Email: goto@catfish.dpri.kyoto-u.ac.jp
Exploration Geophysics 48(1) 16-27 https://doi.org/10.1071/EG16113
Submitted: 21 September 2016 Accepted: 22 September 2016 Published: 9 November 2016
Abstract
We conducted single-site and array observations of microtremors in order to revise the shallow subsurface structure of the Furukawa district, Miyagi, Japan, where severe residential damage was reported during the Great Eastern Japan Earthquake of 2011, off the Pacific coast of Tohoku. The phase velocities of Rayleigh waves are estimated from array observations at three sites, and S-wave velocity models are established. The spatial distribution of predominant periods is estimated for the surface layer, on the basis of the spectral ratio of horizontal and vertical components (H/V) of microtremors obtained from single-site observations. We then compared ground motion records from a dense seismometer network with results of microtremor observations, and revised a model of the shallow (~100 m) subsurface structure in the Furukawa district. The model implies that slower near-surface S-wave velocity and deeper basement are to be found in the southern and eastern areas. It was found that the damage in residential structures was concentrated in an area where the average value for the transfer functions in the frequency range of 2 to 4 Hz was large.
Key words: array observation, H/V spectral ratio, microtremor survey, phase velocity, S-wave velocity structure, shallow subsurface layers, single-site observation, transfer function.
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