structural interpretation of two reflection profiles across the Tonga Arc by Loren W. Kroenke

Cover of: structural interpretation of two reflection profiles across the Tonga Arc | Loren W. Kroenke

Published by Technical Secretariat, CCOP-SOPAC in Suva [Fiji] .

Written in English

Read online

Places:

  • Tonga.

Subjects:

  • Geology -- Tonga.,
  • Seismic reflection method.

Edition Notes

Bibliography: p. [15]

Book details

StatementLoren Kroenke, Sione L. Tongilava.
SeriesSouth Pacific marine geological notes ;, v. 1, no. 2
ContributionsTongilava, Sione L., joint author.
Classifications
LC ClassificationsQE350.42.S68 S68 vol. 1, no. 2, QE349.T66 S68 vol. 1, no. 2
The Physical Object
Paginationp. 10-[15] :
Number of Pages15
ID Numbers
Open LibraryOL3137921M
LC Control Number82464999

Download structural interpretation of two reflection profiles across the Tonga Arc

Seismic reflection profiles and drilling results from Sitelocated on the western margin of the Tonga Ridge. The evolution took place in three episodes that have been related to the rifting of the Tonga/Lau Ridge and spreading in the Lau Basin.

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For over 35 years, deep seismic reflection profiles have been acquired across Australia [1] to better understand the crustal architecture and geodynamic evolution of key geological provinces.

Onshore-offshore wide-angle seismic reflection and refraction data are combined with multi-channel seismic reflection profiles to model crustal structure within a 32, km2 block of the northern. Structural constraints from the recent drilling program and interpretation of a deep crustal seismic profile across the region indicate a c.

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[1] Multichannel seismic (MCS) profiles and bathymetric data from the central Mariana and Izu‐Bonin subduction systems image the subducting Pacific Plate from the outer trench slope to beneath serpentinite seamounts on the outer fore arc.

Subducting oceanic crust varies along the Mariana margin from to 7 km thick and is covered by –2 km thick sediments and numerous seamounts. weaknesses of the two different methods of structural interpretation of an area of seafloor.

INTRODUCTION The Charles Darwin Cruises 33 and 33B obtained GLORIA sidescan sonar images of the axial part of the north-northeast-trending Tonga Trench between 22° and 27°30'S. Coverage included that por.

In the Bismarck Volcanic Arc in Papua New Guinea, six fields of sediment waves were imaged with sonar. Sediment structures observed in seismic data and swath bathymetry are not unique and can result from predominantly continuous (bottom) currents, or episodic (turbidity) currents, or.

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The age of arc contamination decreases westward along the Sunda Arc and eastward along the Banda Arc. Other aspects of the collision also decrease to the west and east from central Timor such as crustal shortening, forearc closure, topography, the age of various synorogenic sedimentary facies, and timing of island emergence as recorded by.

Field-based structural analysis of an exhumed, ~km-long strike-slip fault zone elucidates processes of growth, linkage, and termination along moderately sized strike-slip fault zones in granitic rocks.

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The slower-than-expected motions of two GPS sites in southeastern El Salvador are consistent with regional- and local-scale seismic and structural evidence for broadly distributed deformation across an ∼km-wide extensional step-over of the volcanic arc in this region and the Gulf of Fonseca.

We also suggest that both arc and backarc basin volcanism are derived from the same source located above the Benioff zone. Melt preferentially rises through the fissures and faults created by extension in the continental crust. The total amount of extension across the Okinawa Trough has been estimated from refraction and gravity data.Correlation of hanging-wall and footwall cutoffs across the two major frontal ramps in the compressional domain indicates a combined lateral displacement (shortening) of km (Figs.

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