15 Degree Shadow Zone of the P-wave Travel-times in the Western Northwest Pacific Basin Observed by an Ocean-bottom Seismometer Long Range Array
利用統計を見る
A long range ocean-bottom seismometer array observation in the western Northwest Pacific Basin revealed a P-wave shadow zone beyond the epicentral distance of 15°. The apparent surface velocity of the P-wave in the distance ranges from 12° to 15° is about 8.6 km/sec, which seems to be a continuation of the 8.4 km/sec (apparent surface velocity) travel-times in the range from 6° to 12°. The off-set of travel-times at the shadow zone is about 1.7-2.0 seconds. The low-velocity zone which corresponds to this shadow zone could be a major transition from lithosphere to asthenosphere. A review of the regional differences of shadow zone gives such an estimate that the depth of the transition is deep beneath the western Northwest Pacific Basin, roughly in a depth range of 100-200 km. The detailed structural analysis will be reported in the next paper.
雑誌名
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo
巻
61
号
3
ページ
415 - 427
発行年
1987-02-10
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
453
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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15 Degree Shadow Zone of the P-wave Travel-times in the Western Northwest Pacific Basin Observed by an Ocean-bottom Seismometer Long Range Array
ji0613002.pdf
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