2nd International Workshop on Long-Period Ground Motion Simulation and Velocity Structures

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November 8-9, 2007
3F Seminar Room, Bldg-1
Earthquake Research Institute, University of Tokyo, Japan

(map, access)


Hosted by Strong Motion Seismology Group* at ERI, Univ. Tokyo
Supported by SCEC-ERI Cooperation Program, Office of International Earthquake and Volcano Research Promotion, ERI, and Grant-in-Aid for Scientific Research (No.19201034)

Program

Scope

The long-period component of seismic ground motion generated by earthquakes causes damage in near-fault regions through source effects such as the directivity effect of rupture propagation and the near-field term of body wave radiation. In addition, the long-period ground motions attenuate slowly with distance due to some path effects, and site effects amplify them in distant basins, so that they can carry destruction to much greater range.

Large-scale structures such as tall buildings and big tanks can resonate with the long-period ground motions because their own natural periods are in the same frequency band. They can even be damaging in some circumstances; the worst example with over 20,000 fatalities in Mexico City at a distance of 400 km from the 1985 Michoacan earthquake. A further example was provided by the 2003 Tokachi-oki earthquake in Hokkaido, Japan. (Koketsu et al., Seism. Res. Lett., 76, No.1, 67-73, 2005)

Therefore, the simulation of long-period ground motion is one of the most important parts of strong motion evaluation and prediction. The modeling of velocity structures along propagation path and within sedimentary basins also plays an important role. We would discuss these aspects of the long-period ground motion in the workshop. Topics include numerical simulation, velocity structures, source effect, path and site effects, damage and risk, and other related issues on the long-period ground motion.


Invited Speakers

Research Members of 2007-2010
Grant-in-Aid for Scientific Research (No.19201034)

* By K. Koketsu, T. Furumura and H. Miyake (ERI, Univ. Tokyo).
This page is located at <http://taro.eri.u-tokyo.ac.jp/workshop/ground_motion2.html>.

Oct. 12, 2007
Aug. 27, 2007
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