北海道とその周辺地域の中・深発地震の発震機構と地質構造との関係

概要

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The faults accompanied by intermediate and deep earthquakes under Hokkaido and its neigh-bours are discussed, based on the data of P-wave radiation pattern by SASATANI (1976). Though two nodal planes are drawn from the analysis, the present author shows that the steeper nodal plane which would correspond to the fault plane at the hypocenter runs parallel to the boundary of each tectonic province. This fact shows that each tectonic unit such as Okhotsk sea basin, Hidaka orogenic belt and Japan sea basin spreads its root deeply into the intermediate-deep earthquake zone, and its formation is intimately related to the zone, though it dips straightly away from the trench.
1979-11-25