000009337 001__ 9337
000009337 005__ 20141205150156.0
000009337 04107 $$aeng
000009337 046__ $$k2008-10-12
000009337 100__ $$aAdachi, Masao
000009337 24500 $$aDetermination of Subsurface Structure of Izumo Plain, Southwest Japan using Microtremors and Gravity Anomalies

000009337 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000009337 260__ $$b
000009337 506__ $$arestricted
000009337 520__ $$2eng$$aMicrotremors and gravity anomalies were observed in the Izumo plain, Southwest Japan. Microtremors were recorded by seismic arrays (4 sites) and 3-component single-site observation (400 sites). Gravity data were obtained at about 50 sites. The microtremor data were analyzed by the spatial auto correlation (SPAC) method and the horizontal-to-vertical spectral ratio (H/V). S-wave velocity in quaternary and the distribution of predominant periods were determined by the microtremor array observation and the H/V (horizontal-to-vertical) spectral ratios, respectively. It was found from the result that the average S-wave velocity in quaternary was 230m/s. The predominant periods of H/V spectral ratios indicate thicknesses of quaternary following to the quarter wavelength law. The thickness was determined to be about 10 to 100m with the predominant period of 0.2 to 1.8s. The subsurface structures was determined by followings:1) S-wave velocity structure models obtained at the array observation sites, 2) a 3D bedrock configuration based on H/V and the residual gravity anomaly, 3) 2D density structures determined using the gravity anomaly and the seismic refraction method.

000009337 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000009337 653__ $$aIzumo Plain, Microtremors, S-wave velocity, Gravity anomalies, Density structures

000009337 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000009337 720__ $$aAdachi, Masao$$iNoguchi, Tatsuya$$iNishida, Ryohei$$iOhata, Itaru$$iYamashita, Tsuyoshi$$iOmura, Kouhei
000009337 8560_ $$ffischerc@itam.cas.cz
000009337 8564_ $$s2538447$$uhttps://invenio.itam.cas.cz/record/9337/files/03-03-0010.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 03-03-0010.
000009337 962__ $$r9324
000009337 980__ $$aPAPER