Structure of the southernmost Okinawa Trough from reflection and wide-angle seismic data

Frauke Klingelhoefer; Chao Shing Lee; Jing Yi Lin; Jean Claude Sibuet

doi:10.1016/j.tecto.2007.11.031

Structure of the southernmost Okinawa Trough from reflection and wide-angle seismic data

Frauke Klingelhoefer, Chao Shing Lee, Jing Yi Lin, Jean Claude Sibuet

Department of Earth Sciences

Research output: Contribution to journal › Article › peer-review

38 Scopus citations

Abstract

During a passive seismic experiment in the Okinawa Trough the shots of two reflection profiles were recorded by ocean bottom seismometers (OBS). Both profiles include 3 ocean-bottom instruments, are about 65 km in length and located in the axial portion of the southwestern Okinawa Trough. Processing of the reflection seismic data images recent deformation of the sedimentary units. Forward modelling of the wide-angle data on both profiles reveals a 1-2 km thick sedimentary infill overlying an acoustic basement characterised by seismic velocities between 3.2 and 3.5 km/s. Crustal thickness could only be modelled on one profile and was determined to be around 10 km, thickening towards the Ryukyu Arc in the south. Gravity modelling was used to additionally constrain both profiles especially the deep structure of Profile 1.

Original language	English
Pages (from-to)	281-288
Number of pages	8
Journal	Tectonophysics
Volume	466
Issue number	3-4
DOIs	https://doi.org/10.1016/j.tecto.2007.11.031
State	Published - 10 Mar 2009

Keywords

Back-arc basin
Crustal structure
Okinawa Trough
Wide-angle seismics

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10.1016/j.tecto.2007.11.031

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title = "Structure of the southernmost Okinawa Trough from reflection and wide-angle seismic data",

abstract = "During a passive seismic experiment in the Okinawa Trough the shots of two reflection profiles were recorded by ocean bottom seismometers (OBS). Both profiles include 3 ocean-bottom instruments, are about 65 km in length and located in the axial portion of the southwestern Okinawa Trough. Processing of the reflection seismic data images recent deformation of the sedimentary units. Forward modelling of the wide-angle data on both profiles reveals a 1-2 km thick sedimentary infill overlying an acoustic basement characterised by seismic velocities between 3.2 and 3.5 km/s. Crustal thickness could only be modelled on one profile and was determined to be around 10 km, thickening towards the Ryukyu Arc in the south. Gravity modelling was used to additionally constrain both profiles especially the deep structure of Profile 1.",

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AU - Klingelhoefer, Frauke

AU - Lee, Chao Shing

AU - Lin, Jing Yi

AU - Sibuet, Jean Claude

PY - 2009/3/10

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N2 - During a passive seismic experiment in the Okinawa Trough the shots of two reflection profiles were recorded by ocean bottom seismometers (OBS). Both profiles include 3 ocean-bottom instruments, are about 65 km in length and located in the axial portion of the southwestern Okinawa Trough. Processing of the reflection seismic data images recent deformation of the sedimentary units. Forward modelling of the wide-angle data on both profiles reveals a 1-2 km thick sedimentary infill overlying an acoustic basement characterised by seismic velocities between 3.2 and 3.5 km/s. Crustal thickness could only be modelled on one profile and was determined to be around 10 km, thickening towards the Ryukyu Arc in the south. Gravity modelling was used to additionally constrain both profiles especially the deep structure of Profile 1.

AB - During a passive seismic experiment in the Okinawa Trough the shots of two reflection profiles were recorded by ocean bottom seismometers (OBS). Both profiles include 3 ocean-bottom instruments, are about 65 km in length and located in the axial portion of the southwestern Okinawa Trough. Processing of the reflection seismic data images recent deformation of the sedimentary units. Forward modelling of the wide-angle data on both profiles reveals a 1-2 km thick sedimentary infill overlying an acoustic basement characterised by seismic velocities between 3.2 and 3.5 km/s. Crustal thickness could only be modelled on one profile and was determined to be around 10 km, thickening towards the Ryukyu Arc in the south. Gravity modelling was used to additionally constrain both profiles especially the deep structure of Profile 1.

KW - Back-arc basin

KW - Crustal structure

KW - Okinawa Trough

KW - Wide-angle seismics

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EP - 288

JO - Tectonophysics

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Structure of the southernmost Okinawa Trough from reflection and wide-angle seismic data

Abstract

Keywords

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