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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Science / Faculty of Science >
北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University >
第69号 >
広帯域MT観測及び重力測定による北海道東部弟子屈地域の地殻構造
| Title: | 広帯域MT観測及び重力測定による北海道東部弟子屈地域の地殻構造 |
| Other Titles: | Crust Structure at Teshikaga region, Eastern Hokkaido, demonstrated by wide-band magnetotelluric and gravity surveys |
| Authors: | 市原, 寛1 Browse this author | | 茂木, 透2 Browse this author | | 山谷, 祐介3 Browse this author | | 神山, 裕幸4 Browse this author | | 小川, 康雄5 Browse this author |
| Authors(alt): | ICHIHARA, Hiroshi1 | | MOGI, Toru2 | | YAMAYA, Yusuke3 | | KAMIYAMA, Hiroyuki4 | | OGAWA, Yasuo5 |
| Issue Date: | 15-Mar-2006 |
| Publisher: | 北海道大学大学院理学研究科地球惑星科学専攻（地球物理学） |
| Journal Title: | 北海道大学地球物理学研究報告 |
| Journal Title(alt): | Geophysical bulletin of Hokkaido University |
| Volume: | 69 |
| Start Page: | 233 |
| End Page: | 255 |
| Abstract: | Wide-band magnetotelliric and gravity surveys were conducted at the Teshikaga area, located in eastern Hokkaido, Japan, where intra-plate earthquakes had teken place. We inferred shallower (<2-Km depth) crustal density structur using the gravity and borehole data, and then compared it with resistivity structure revealed by two-dimensional MT inversions. The results show that the density and resistivity structures are closely correlated with each other. The resistivity profiles and Bouguer anomaly map indicate that the high density and high resistivity zone, which presumably represents Miocene volcanic and sedimentary rocks is apparently cut by a major dextral strike slip fault. Location and strike of the apparent dextral strike slip fault closely match those of the inferred earthquake fault formed by the 1938's earthquake estimated from surface displacement. However, the dextral strike slip movement is not the result of recent crustal movement, because sinistral movement has been documented for the earthquake faults. Preexisting dextral strike slip fault was presumably reactivated to cause present-day earthquakes. |
| Type: | bulletin (article) |
| URI: | http://hdl.handle.net/2115/21512 |
| Appears in Collections: | 北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University > 第69号
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