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Geological Society, London, Special Publications; 1998; v. 137; p. 255-265;
DOI: 10.1144/GSL.SP.1998.137.01.20
© 1998 Geological Society of London

Worldwide Gas Hydrate Occurrences and Regional Case Studies

Reflection characteristics, depth and geographical distribution of bottom simulating reflectors within the accretionary wedge of Sulawesi

S. Neben, K. Hinz & H. Beiersdorf

Bundesanstalt für Geowissenschaften und Rohstoffe (BGR), Stilleweg 2, D-30655 Hannover, Germany

Several reflection seismic profiles across the subduction zone north of Sulawesi show strong bottom simulating reflectors (BSRs) below the lower and upper slopes of the accretionary wedge. The geographical distribution, depth and the reflection characteristics of the BSRs have been described in detail. Along one reflection seismic profile the depth of BSR was correlated with heat flow data. These correlations indicate that at locations, where the heat flow is high and the BSR interrupted, active venting of methane may occur at the sea floor. The occurrence of BSRs is limited to the central part of the North Sulawesi subduction zone (between 121°30'E and 123°30'E). In the westernmost part of the surveyed area only short BSR segments are found, which may be a result of slope instability and slumping of sediments. On the easternmost profile, no bottom simulating reflectors are found at all.