Common Reflection Angle Migration Revealing the Complex Deformation Structure beneath Forearc Basin in the Nankai Trough

K. Shiraishi, M. Robb, K. Hosgood, Y. Yamada

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In order to better understand the deformation structures within the thick accreted sediments beneath forearc basin, we apply an advanced beam migration to a legacy 2D seismic data acquired in the deep-water area in the Nankai Trough, Japan. In this region, many seismic surveys have been conducted to study the geophysical and geological features in the seismogenic zone related to the plate subduction. However, the details in the accreted sediments beneath the Kumano forearc basin are still unclear due to the poor seismic images caused by difficult geological structures. The common reflection angle migration is an advanced depth migration technology and an effective method for imaging such complex structures. By applying this method, deeper reflections that were difficult to image previously are clearly revealed. The newly imaged geometric features (e.g., the folds in the shallow part and the deep reflectors with stepwise discontinuities and the land-ward thickening of the lower layer) implies that the deformation is characterized by development of multiple thrust faults in the thick accreted sediments. The common reflection angle migration provides new seismic evidences that are essential for understanding the Nankai Trough seismogenic zone and the accretionary prism development.

Original languageEnglish
Title of host publication80th EAGE Conference and Exhibition 2018
Subtitle of host publicationOpportunities Presented by the Energy Transition
PublisherEuropean Association of Geoscientists and Engineers, EAGE
ISBN (Electronic)9789462822542
DOIs
Publication statusPublished - 2018
Externally publishedYes
Event80th EAGE Conference and Exhibition 2018: Opportunities Presented by the Energy Transition - Copenhagen, Denmark
Duration: Jun 11 2018Jun 14 2018

Publication series

Name80th EAGE Conference and Exhibition 2018: Opportunities Presented by the Energy Transition

Conference

Conference80th EAGE Conference and Exhibition 2018: Opportunities Presented by the Energy Transition
Country/TerritoryDenmark
CityCopenhagen
Period6/11/186/14/18

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Fingerprint

Dive into the research topics of 'Common Reflection Angle Migration Revealing the Complex Deformation Structure beneath Forearc Basin in the Nankai Trough'. Together they form a unique fingerprint.

Cite this