THE LEMBANG FAULT

Convention Bandung 2004 (CB2004) The 33^rd Annual Convention & Exhibition 2004

Indonesian Association of Geologist Horizon Hotel, 29-30 Nov, 1 Oct 2004, Bandung

THE LEMBANG FAULT

Danny H. Natawidjaja and Djedi S. Widarto

Research Center for Geotechnology-LIPI

Abstract

Lembang fault runs east-west in the northern part of Bandung. This fault zone is clearly seen along its ~25 km section, indicated by a lineament of a marching hills, from the area east of Maribaya resort to the Cisarua-Cimahi region in the west. The tectonic morphologies on and around the fault line indicates that this fault has been active in the Quaternary through the Holocene periods, and probably until recent. The length of the fault implies that this fault may be able to produce an earthquake with a magnitude of 6 to 7. The fault zone that runs through a fairly developed and populated region, and is located just about 15 km north of the highly populated city of Bandung urges to be seriously taken into account for hazard mitigations and for a development planning of the city. We perform geological and morpho-tectonics analyses as well as reviewing previous geological and geophysical data in order to investigate the history, kinematics and activity of the Lembang fault.