2024-03-28T10:10:12Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/381672022-11-17T02:08:08Zhdl_2115_38140hdl_2115_13714hdl_2115_116巨大遠地地震による長周期歪地震波形の解析 : 2004年Sumatra-Andaman地震 (Mw9.0) 及び2005年Nias地震 (Mw8.6)Analysis of long-period strain seismograms from great far earthquakes : 2004 Sumatra-Andaman earthquake (Mw9.0) and 2005 Nias earthquake上垣, 拓郎池上, 裕中西, 一郎小久保, 一哉露木, 貴裕中村, 浩二原田, 智史453The long-period strain seismograms from the Sumatra-Andaman earthquake of December 26, 2004 and the Nias earthquake of March 28, 2005 are analyzed by comparing the observed seismograms with synthetic seismograms calculated by normal mode theory. The multiple CMT source (Tsai et al., 2005) and Harvard CMT solution explain the seismograms recorded by both extensometers and volumetric strainmeters from the 2004 and 2005 earthquakes, respectively. The long-period strain seismograms observed in Japan are consistent with about 9 min source duration and 1200 km fault length proposed by Tsai et al. (2005) and Velasco et al. (2006).北海道大学大学院理学研究院自然史科学部門(地球物理学)Departmental Bulletin Paperapplication/pdfhttp://hdl.handle.net/2115/38167info:doi/10.14943/gbhu.72.379https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/38167/1/27_Nakanishi.pdf0439-3503AN0008976X北海道大学地球物理学研究報告723793822009-03-15jpnpublisher