GRAVITY FIELD, SURFACE TOPOGRAPHY, AND VOLCANIC COMPLEXES OF KAMCHATKA AND ITS JUNCTION WITH THE ALEUTIAN ARC
N.L. Dobretsov1,2, A.N. Vasilevskiy1,2
1A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia
2Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia
Keywords: Тектоника, геодинамика, вулканоплутонические структуры, гравитационные аномалии, комплексная интерпретация, Камчатский регион, Tectonics, geodynamics, volcanoplutonic complexes, free-air and Bouguer gravity anomalies, integrated interpretation, Kamchatka
Abstract
The paper deals with interpretation of global digital maps of gravity anomalies and surface topography for the northwestern Pacific and Kamchatka regions. A transformation procedure is suggested to reveal subtle features of surface topography against high elevation contrasts. Gravity data (free-air and Bouguer anomalies) have important implications for the evolution of the circum-Pacific region and the problems of volcanism and geodynamics in subduction zones. The patterns of gravity anomalies and transformed topography interpreted jointly with onshore and offshore geological data can make a basis for tectonic paleoreconstructions of upper crust and lithospheric mantle structures.
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