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ANTOSTRAT information

Antarctic margin seismic stratigraphy and paleoenvironment

TRC/JNOC(Technology Research Center/Japan National Oil Corporation) has carried out a series of basic geological and geophysical surveys around Antarctica since 1980 in corporation with Geological Survey of Japan by order of NREA/MITI(Natural Resources and Energy Agency/Ministry of International Trade and Industry).
This is a survey tracks of Multichannel Seismic profiling in this project, 1980-1994.

Gas Hydrate BSR?

The following image shows Bottom Simulating Reflector (BSR) on the seismic reflection profile taken by USGS. This kind of BSR is believed as the base of gashydrate layer which shows more consolidated physical property than the deeper normal sediment.

Gas Hydrate BSR?

Introduction to Gas Hydrate is available here.

Wilkes Land Paleo Glacial Activity

Wilkes Land Margin, East Antarctica, is a typical Atlantic type continental margin. It records the paleoenvironmental information in its stratigraphy and geological structure since late Cretaceous. The margin was intensively surveyed by USGS (U.S. Geological Survey), IFP (Institut Francais de Petrol) and JNOC (Japan National Oil Coorporation) with multichannel seismic reflection (MCS) method.

MCS records give the geological structure and stratigraphic information with which we can estimate the extent of Antarctic glacial activity in this margin.

Index map of Wilkes Land margin MCS surveys, by USGS, IFP, JNOC.

Example of MCS profile off Wilkes Land Margin. Note WL2 unconformity.

Interpretation of MCS profile with MCS profile image.

Interpretation of MCS profile.

Marine Geology Department, GSJ, Homepage
GSJ WWW server Home Page
1995/05/30
This page is prepared by Manabu Tanahashi, tana@gsj.go.jp