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北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University >
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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)
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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