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JDR Vol.11 No.6 pp. 1253-1270
(2016)
doi: 10.20965/jdr.2016.p1253

Paper:

Empirical Fragility Curves of Buildings in Northern Miyagi Prefecture During the 2011 off the Pacific Coast of Tohoku Earthquake

Hao Wu*,†, Kazuaki Masaki*, Kojiro Irikura*, and Susumu Kurahashi**

*Disaster Prevention Research Center, Aichi Institute of Technology
Yachigusa 1247, Yakusa-cho, Toyota, Japan

Corresponding author,

**Department of Civil Engineering, Aichi Institute of Technology, Toyota, Japan

Received:
January 28, 2016
Accepted:
September 18, 2016
Published:
December 1, 2016
Keywords:
empirical fragility curves, the 2011 off the Pacific coast of Tohoku Earthquake, microtremor H/V spectral ratio, damage ratio indices, estimated ground motions
Abstract

In this study, empirical fragility curves expressed in terms of relationship between damage ratio indices of buildings and ground motion indices were developed in northern Miyagi prefecture located in near-field areas during the 2011 off the Pacific coast of Tohoku Earthquake. The ground motion indices were evaluated from observed ground motions at strong-motion stations and estimated at sites at which no strong-motion accelerometers were deployed during the mainshock. The ground motions at the non-instrumental sites were estimated using the empirical Green’s function method based on bedrock motions inverted from observed records on surfaces from small events that occurred inside the source fault, transfer functions due to underground velocity structures identified from microtremor H/V spectral ratios, and a short-period source model of the mainshock. The findings indicated that the empirical fragility curves as functions of Japan Meteorological Agency (JMA) instrumental seismic intensity during the 2011 Tohoku Earthquake almost corresponded to those during the 1995 Kobe Earthquake and the seven disastrous earthquakes that occurred between 2003 and 2008. However, the empirical fragility curves as functions of peak ground velocity were the lowest. A possible reason for this is that the response spectra of the ground motions in the period ranging from 1.0 s to 1.5 s were small during the 2011 Tohoku Earthquake. Another reason could be the seismic resistant capacities of buildings in the studied districts involved during the 2011 Tohoku Earthquake exceeded those in the cities affected during the 1995 Kobe Earthquake.

Cite this article as:
H. Wu, K. Masaki, K. Irikura, and S. Kurahashi, “Empirical Fragility Curves of Buildings in Northern Miyagi Prefecture During the 2011 off the Pacific Coast of Tohoku Earthquake,” J. Disaster Res., Vol.11, No.6, pp. 1253-1270, 2016.
Data files:
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Last updated on Dec. 11, 2018