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ABSTRACT: Seismic Images of Convergent Margin Tectonic Structures

Roland Von Huene, Hans Vosberg

The growth histories of convergent margins are characteristically discontinuous involving periods of accretion and erosion. The expansion of the seaward edge of continents from subduction accretion is well studied and documented by the ages and volumes of the attached materials. Much less clear is the quantity of material that has been subducted beneath or eroded from the margins because those materials have been swept out of view.

Research level processing of older data and images revealed in recently acquired record sections show some of these deeper processes. Many images were obscured by scattered energy and distorted seismic signals from complex structure in the upper 2 to 4 km beneath the seafloor. These deeper structures are now visible showing sediment subduction and underplating as well as erosional truncation. Such data are presented to illustrate some structures resulting from tectonic processes at convergent margins.

AAPG Search and Discovery Article #90097©1990 Fifth Circum-Pacific Energy and Mineral Resources Conference, Honolulu, Hawaii, July 29-August 3, 1990