Some Magnetic Anomalies Accompanied with Topographic Irregularities of Subducting Plate and Their Tectonic Implications

概要

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From the detailed aeromagnetic survey data and seismicity data on the area around the Japan arc, it was found that several magnetic anomalies with relatively short wave-lengths are accompanied with high seismic activity. Based on the results of model analysis, geological data and crustal structures inferred from seismic studies, we propose a possible interpretation that irregularities on the underthrusting plate such as seamounts or local bathymetric highs cause the magnetic anomalies, earthquakes and certain other surface geological features.日本列島周辺の詳細な空中磁気探査及び地震活動データから,比較的短波長の地磁気異常のいくつかが,高い地震活動を伴うことが判明した.モデル解析,地質学的データ及び地震学的に推定される地殻構造などに基づき,海山や局地的な隆起地形のような,沈みこむプレート上の凹凸が,地磁気異常,地震,表層地質の特徴などの原因をなすという解釈を提唱する.
1980-03-31