海洋地殻と重力異常 [in Japanese] Oceanic Crust and Gravity Anomaly [in Japanese]
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Characteristics of bottom topography and gravity anomalies in mid-oceanic ridges and their implications for tectonics and sub-bottom structures have been studied since the 1960's. Recently global gravity data derived from satellite altimetry have become available. Combina-tion of these global gravity data and results of global seismic studies has revealed that the difference in the pattern of gravity anomalies between slow-spreading and fast-spreading ridges is derived from the difference in the distribution of melt layers in the whole upper mantle beneath them : the former is characterised by a deeper melt layer of limited size, while the latter is characterised by a widespread melt layer in which minimum S-wave velocity anomaly is located shallower than 100 km in depth.
- J. Geogr.
J. Geogr. 104(3), 428-437, 1995-06-25
Tokyo Geographical Society