Preliminary Analysis for Ground Structure around Source Region of 2008 Iwate-Miyagi Nairiku Earthquake  

作　　者：Hitoshi Morikawa Masachika Tanigawa Taiyo Kobayashi Hiroko Matsuo 

机构地区：[1]Oepartment of Built Environment, Tokyo Institute of Technology Yokohama 226-8502, Japan [2]Local Goverment of Kanagawa Prefecture, Yokohama, Japan

出　　处：《Journal of Civil Engineering and Architecture》2011年第2期175-179,共5页土木工程与建筑（英文版）

摘　　要：To obtain a detailed model of the three-dimensional ground structure, the microtoremor and gravity surveys were carried out around Kurikoma area, Japan, where is the source reagion of 2008 Iwate-Miyagi nairiku earthquake and is located about 90 km north of Sendai. Using the microtremor data, velocity structures of shallow sediments are estimated and the results at some of the sites are reported preliminarily. We could not find the detailed velocity structure to bedrock, because small arrays for the microtremor observation were applied, However, significant structures are observed for shallow velocity structure at some sites. Furthermore, gravity data provided Bouguer anomaly, which is one of gravity anomalies, around the target area. From the Bouguer anomaly, area with low anomaly is tbund around the south-eastern area of the fault plane.

关 键 词：Gravity survey microtremor array observation ground structure 2008 Iwate-Miyagi Nairiku Earthquake. 

分 类 号：P315[天文地球—地震学] TQ63[天文地球—固体地球物理学]