In 1997 and 1998, intensive wide-angle seismic experiments were carried out in the northern part of Honshu Island, Japan to clarify various scale crustal deformation ongoing in the northern Hon-shu arc. The 1998 experiment was intended to reveal the crustal scale structural heterogeneity west of the western boundary fault of the Kitakami Lowland. In a 20km×50km area, 236 receivers were deployed to record 13 dynamite shots detonated on August 10. On September 3, M 6.1 event oc-curred in the vicinity of our study area. To investigate seismic velocity change associated with the event, another experiment was undertaken on November 8 using an additional dynamite source at the same place of the northernmost shot point in the August experiment. The data qualities of these two experiments are good, and first arrivals can be traced in almost the entire part of the experi-mental area. They show significant travel time change across the western boundary fault of the Kitakami Lowland. In the NS profile, a remarkable later phase is recognized, which is interpreted as a wide-angle reflection from midcrustal interface at a depth of 6－7km. This paper presents the outline of the experiments and fundamental data obtained.
雑誌名
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo
巻
83
号
1
ページ
43 - 75
発行年
2008
ISSN
00408972
書誌レコードID
AN00162258
フォーマット
application/pdf
日本十進分類法
051.1
出版者
東京大学地震研究所
出版者別名
Earthquake Research Institute, University of Tokyo
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1998年東北奥羽脊梁山地東麓における稠密屈折・広角反射法探査
IHO83103.pdf
(5.98MB)
