[S-SS10] Strong Ground Motion and Earthquake Disaster

[SSS10-05] Microtremor measurements at seismograph sites and damage concentration areas during the 2023 Kahramanmaraş earthquake in Türkiye

*Shinichiro Mori¹, Nurcan Meral Özel², Koji Hada³, Yoshinori Fujino³, Takumi Hayashida⁴, Gulten Polat⁵, Yasemin Korkusuz Öztürk², Dilek Kepekçi², Hiroyuki Goto⁶, Maki Koyama⁷, Shigeto Osato⁸, Masayuki Yamada³, Tatsuro Chiba⁹ (1.Ehime University, 2.Bogazici University, 3.NEWJEC, 4.Building Research Institute, 5.Yeditepe University, 6.Kyoto University, 7.Gifu University, 8.Soil Research, 9.Asia Air Survey)

Keywords:microtremor measurements

The objective of this study is to develop a new MM seismic intensity calculation formula using seismic motion records that can appropriately evaluate the seismic intensity higher than 9 MM intensity, based on the correspondence between the degree of structural and ground damage around the seismograph and the seismic motion recorded in high density wide areas, and to clarify the seismic intensity in the damage concentration area of each city by microtremor measurements and seismic intensity questionnaire survey. In order to evaluate the distribution of high-density seismic intensity, a questionnaire survey of citizens will be conducted in cooperation with members in Türkiye and Japan, as well as interviews in seismograph areas and questionnaire surveys through elementary and junior high schools.The results are expected to be useful for the reconstruction of Türkiye, future revision of building design standards, and earthquake risk management. In this report, we report the results of microtremor measurements at 31 seismograph sites and 28 concentrated damage areas.