Upper Mantle Structure Beneath the Japan Trench and Tohoku Arc Viewed from Mantle Bouguer Anomalies.

スポンサーリンク

概要

• 論文の詳細を見る

• Mantle Bouguer gravity anomaly gives density anomaly in the upper mantle. We compiled the mantle Bouguer anomaly in the Japan Trench and Arc using data of crustal structure given from explosion seismology. A profile of the gravity anomalies across the subduction zone shows a regional positive anomaly over the island arc. The profile also shows local low-density anomalies beneath the central part of the island arc and near the trench axis. A relatively positive anomaly of about 70 mgals still exists over the island arc after removing the effect of the subducting slab. We suspect missing of the low-density layers on the surface of the slab can explain the result. The low-density zone beneath the central part of the island arc relates to the zone of volcanic activity expected from petrological studies. Another low density zone relates to accretion of sediment near the trench axis.

• 日本学士院の論文

著者

• Fujimoto Hiromi

  Ocean Research Institute University Of Tokyo

• ITO Maki

  Technical Department, Metal Mining Agency of Japan

関連論文

• Gravimetric connection between Tokyo and McMurdo Sound
• MAPS OF GRAVITY ANOMALIES AND BOTTOM TOPOGRAPHY IN THE WESTERN PACIFIC AND REFERENCE BOOK FOR GRAVITY AND BATHYMETRIC DATA
• PROCESSING OF GRAVITY DATA AT SEA AND THEIR GEOPHYSICAL INTERPRETAION IN THE REGION OF THE WESTERN PACIFIC
• Interaction of the Upwelling Plume with the Phase and Chemical Boundaries (2) -Effects of the Pressure-Dependent Viscosity-
• Development of instruments for seafloor geodesy
• Stress Fields in Slabs Penetrating into the Lower Mantle, and Rheology and Composition of the Lower Mantle.
• Deep Structure of Seamount of Younger Age Inferred from Gravity Anomaly.
• Upper Mantle Structure Beneath the Japan Trench and Tohoku Arc Viewed from Mantle Bouguer Anomalies.

スポンサーリンク