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JDR Vol.7 No.6 pp. 693-700
(2012)
doi: 10.20965/jdr.2012.p0693

Paper:

Strong Motion Records of the 2011 Tohoku Earthquake and its Attenuation Characteristics

Saburoh Midorikawa, Hiroyuki Miura, and Tomohiro Atsumi

*Department of Built Environment, Tokyo Institute of Technology, 4259-G3-3 Nagatsuta, Midori-ku, Yokohama 226-8502, Japan

Received:
July 3, 2012
Accepted:
October 19, 2012
Published:
December 1, 2012
Keywords:
strong motion record, the 2011 Tohoku Earthquake, ground motion attenuation
Abstract

Many strong motion records were obtained during the 2011 Off the Pacific Coast of Tohoku earthquake owing to the implementation of dense strong motion observation in Japan. The earthquake provides an opportunity to examine the characteristics of strong ground motion from a gigantic earthquake. Attenuations of peak acceleration and velocity are examined by comparing them to curves from existing attenuation relationships. When the shortest distance from the fault plane of the slip distribution model is used, curves for Mw8.0 to 8.3 give the smallest deviation from data, suggesting the saturation of ground motion intensity at large magnitudes. When the shortest distance from the strong motion generation areas is used, however, the scattering of data becomes smaller and the curve for Mw9.0 fits acceleration data. Results thus change with the definition of distance. This suggests that a consideration of the rupture heterogeneity is important in strong motion prediction for gigantic earthquakes.

Cite this article as:
Saburoh Midorikawa, Hiroyuki Miura, and Tomohiro Atsumi, “Strong Motion Records of the 2011 Tohoku Earthquake and its Attenuation Characteristics,” J. Disaster Res., Vol.7, No.6, pp. 693-700, 2012.
Data files:
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