P-wave Velocity in the Lower-Lithosphere in the Western Northwest Pacific Basin Observed by an Ocean-bottom Seismometer Long Range Array
スポンサーリンク
概要
- 論文の詳細を見る
Using natural earthquakes as sources in the seismic refraction method for studying the upper mantle structure, an ocean-bottom seismometer array observation was performed in the western Northwest Pacific Basin in the summer of 1981. This observation revealed that the apparent surface velocity of P-waves refracted from the lower-lithosphere was observed as 8.4 km/sec in the epicentral distances of 7°-9°. The true velocities at their turning points (depth level 60-100km) were about 8.3km/sec. The existence of 8.4-8.5km/sec (apparent velocity) layers at the top of the lower-lithosphere appears to be a general feature not only beneath the continental shield regions but also beneath the old ocean basins. Such a P-wave velocity supports the garnet-pyrolite model for the mineralogical composition of the lower-lithosphere.
- 東京大学地震研究所,Earthquake Research Institute, University of Tokyo,東京大学地震研究所,神戸大学理学部の論文
- 1987-02-10
東京大学地震研究所,Earthquake Research Institute, University of Tokyo,東京大学地震研究所,神戸大学理学部 | 論文
- 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
- P-wave Velocity in the Lower-Lithosphere in the Western Northwest Pacific Basin Observed by an Ocean-bottom Seismometer Long Range Array