SAFETY ASSESSMENT OF UNDERGROUND TANK AGAINST LONG-PERIOD STRONG GROUND MOTION - ESTIMATION OF DEEP SUBSURFACE STRUCTURE BY OBSERVING MICROTREMOR AND STRONG-MOTION IN AKITA DISTRICT -
In considering the safety of oil storage, it is important to grasp the characteristics of long-period ground motion causing sloshing, and it is also useful to investigate deep subsurface structures at the site, as well as to analyze the characteristics of long-period ground motion by the observed earthquake waves.In this study, we conducted the above investigation and analysis in Oga area where Akita National Petroleum Stockpiling Base is located and Akita City/Sanno area around Oga area. As s result, we obtained the following results: 1) In both areas, we estimated deep subsurface structures to reproduce both phase velocity and H/V ratio of microtremor observation records. 2) We confirmed that the group velocity of the strong-motion observation records approximately corresponded to the theoretical dispersion curve of the estimated deep subsurface structures in both areas. 3) According to the estimated deep subsurface structures, the depth of Vs=3km/s to be the seismic bedrock was 0.8km in the Oga area and 1.8km in the Sanno area, revealing that the structure in the Sanno area tends to amplify the long-period ground motion more than that in the Oga area.
long-period ground motion oil storage tank deep subsurface structure microtremor observation strong-motion observation
Tatsuya IWAHARA Tsukasa MITSUTA Yuji HORII Akira ISHII Naoto OHBO Tomoyasu HAMADA Kenji KATO Toshihiko MIZUTA
Japan Oil, Gas and Metals National Corporation, Japan Kajima Corporation, Japan Akita National College of Technology, Japan
国际会议
14th World Conference on Earthquake Engineering(第十四届国际地震工程会议)
北京
英文
2008-10-12（万方平台首次上网日期，不代表论文的发表时间）