THE 6TH IASPEI / IAEE INTERNATIONAL SYMPOSIUM: THE EFFECTS OF SURFACE GEOLOGY ON SEISMIC MOTION
On behalf of the Joint Working Group of the Effect of Surface Geology on Seismic Motion (JW-ESG) supported by both IASPEI (International Association of Seismology and Physics of the Earth's Interior) and IAEE (International Association of Earthquake Engineering), we are very pleased to announce that the 6th International Symposium on the Effects of Surface Geology on Seismic Motion (ESG6) will be held on March 2021 in Kyoto, Japan. As a convention from previous symposiums we will focus our attention on all the issues of site effects on ground motions, together with the issues related to quantitative prediction of ground motions reflecting those effects. The key theme of ESG6 is “Progress of ESG research during the last three decades: How good can we predict site amplification?” We are very much appreciated time and effort of the organizing committee of ESG6 under the Japan Association for Earthquake Engineering without which we cannot make a concrete plan of ESG6.
In 1985 JW-ESG was established by the leadership of Prof. Bill Iwan and Dr. Brian Tucker as co-chairmen to promote international activities to see how the effect of surface geology will affect ground motion characteristics. Soon after the establishment of JW-ESG, 1985 Michoacan, Mexico earthquake occurred, which provided us an extraordinary long in period and long in duration seismograms inside the Mexico City basin. Since then seismologists and earthquake engineers around the world noticed how important to understand the effects of surface geology on ground motions. Thereafter, whenever large disastrous earthquakes happened, we found that they provided us invaluable observed evidence on different aspects of site effects very much related to the distribution of the structural damage. At the same time these earthquakes also provided new questions that we need to answer for more quantitative prediction of ground motions for future earthquakes. In recent years we are struggling how to fully utilize huge amount of strong motion data in seismically active regions, while we are also struggling how to constrain physical models by small numbers of data in less active regions. We really hope that this ESG6 symposium will be a place to bring together all the scientists and engineers who are interested in strong motion evaluation and prediction to look back 35 years of our history of investigation on ESG first and then to exchange new ideas and techniques for constructing better methodology for safer and more secure built environment as a result of global collaborations.