000019800 001__ 19800
000019800 005__ 20170118182337.0
000019800 04107 $$aeng
000019800 046__ $$k2017-01-09
000019800 100__ $$aNagano, Shuichi
000019800 24500 $$aVerification of Subsurface S-Wave Velocity Structure Model in Iwaki City, Fukushima Prefecture, Using a Dense Seismic Array

000019800 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000019800 260__ $$b
000019800 506__ $$arestricted
000019800 520__ $$2eng$$aA dense seismic/microtremor array consisting of 16 sensors was deployed in Iwaki city, Fukushima prefecture, Japan from November 2014 to September 2015. During the observation period, seismic signals from at least 100 felt earthquakes (3.5 ≤ Mw ≤ 7.9) as well as continuous microtremors were recorded. In this study we used the event data to investigate site amplification factors beneath the observation sites and also used microtremor data to estimate propagation properties of surface wave in the entire area, for the verification of an existing three-dimensional seismic velocity structure model. The site amplification factors estimated from spectral inversion method indicate the spatial variations of subsurface soil structure and the Rayleigh-wave dispersion properties derived from the seismic interferometry technique show lower group velocities compared with the theoretical curve from the existing model. On the other hand, predicted dominant frequency and group velocity of Rayleigh wave based on one-dimensional S-wave structure model from large-scale microtremor array survey show similar trends with the estimations. The results show that the combined use of the dense microtremor and strong motion data in a local area of high seismicity can be a powerful tool for the improvement of subsurface structure model.

000019800 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000019800 653__ $$aArray observation, Spectral inversion, Seismic interferometry, Group velocity, Surface wave dispersion

000019800 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000019800 720__ $$aNagano, Shuichi$$iKashima, Toshihide$$iHayashida, Takumi$$iNakagawa, Hiroto$$iYokoi, Toshiaki$$iKoyama, Shin
000019800 8560_ $$ffischerc@itam.cas.cz
000019800 8564_ $$s775055$$uhttps://invenio.itam.cas.cz/record/19800/files/4437.pdf$$yOriginal version of the author's contribution as presented on USB, paper 4437.
000019800 962__ $$r16048
000019800 980__ $$aPAPER