Accession Number : ADA298639

Title :   Geophysical Studies of Plate-Boundary Earthquakes and Mid-Plate Volcanism in the Ocean Basins.

Descriptive Note : Doctoral thesis,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE

Personal Author(s) : Wolfe, Cecily J.

PDF Url : ADA298639

Report Date : JUN 1994

Pagination or Media Count : 175

Abstract : Both gravity and seismic reflection data can be used to constrain the response of oceanic lithosphere to loading by intraplate volcanoes. Analysis of gravity data from Cretaceous seamounts in the Northwest Pacific demonstrates that the strength of the Pacific lithosphere at the time that the volcanoes erupted was less than predicted by standard thermal plate models. Seismic reflection data from the Marquesas Islands in French Polynesia, a modern-day analogue of the geologic setting in which the northwest Pacific seamounts formed, demonstrate that volcanic underplating of the crust creates another volcanic load which pushes the lithosphere up from below, leading to an anomalously shallow flexural moat. (AN)

Descriptors :   *EARTHQUAKES, *OCEAN BASINS, *VOLCANOES, *MARINE GEOPHYSICS, OCEAN CURRENTS, DISPLACEMENT, THESES, DEPTH, FAULTS(GEOLOGY), BATHYMETRY, STRATIGRAPHY, SEISMIC DATA, MARINE GEOLOGY, SEISMIC REFLECTION, SEISMIC WAVES, GRAVITY, PACIFIC OCEAN, PLATE TECTONICS, OCEAN MODELS, OCEAN BOTTOM TOPOGRAPHY, HAWAII, SEDIMENTATION, ISLANDS, OCEANIC CRUST, MICROSEISMS, MAGNETIC ANOMALIES, SEAMOUNTS, LITHOSPHERE, GEOLOGIC MODELS, MIDATLANTIC RIDGE, POLYNESIA.

Subject Categories : Physical and Dynamic Oceanography
      Geology, Geochemistry and Mineralogy
      Seismology

Distribution Statement : APPROVED FOR PUBLIC RELEASE