Abstract
The Lembang fault located at northern part of populated Bandung basin is the most conspicuous fault that potentially capable in generating earthquakes. The first seismic investigation around Lembang fault has been done by deploying a seismic network from May 2010 till December 2011 to estimate the seismic activities around that fault. Nine events were recorded and distributed around the fault. Seven events were likely to be generated by the Lembang fault and two events were not. The events related to the Lembang fault strongly suggest that this fault has left-lateral kinematic. It shows vector movement of Australian plate toward NNE might have been responsible for the Lembang fault kinematic following its initial vertical gravitational movement. The 1-D velocity model obtained from inversion indicates the stratigraphy configuration around the fault composed at least three layers of low Vp/Vs at the top, high Vp/Vs at the middle layer and moderate Vp/Vs at the bottom. In comparison with general geology of the area, top, mid and bottom layers may consecutively represent Quaternary volcanic layer, pre-Quaternary water-filled sedimentary layer and pre-Quaternary basement. Two eastern events related to minor faults and were caused by a gravitational collapse.
Highlights
The Lembang fault located at northern part of populated Bandung basin is the most conspicuous fault that potentially capable in generating earthquakes
The plus ones at Tangkubanperahu Volcano (TKP), MYN and ATR are related to the volcanic zone. From this investigation, stratigraphy of the study area has been revealed based on Vp, Vs and Vp/Vs, consisting
In a perspective of aspect ratio of water content, the top layer with low Vp/Vs, low Vp and low Vs is composed of rocks with largest aspect ratio of water content
Summary
The Lembang fault located at northern part of populated Bandung basin is the most conspicuous fault that potentially capable in generating earthquakes. Rifting associated with catastrophic sector failure eruptions destroyed the volcanic cones, while the depressurization of the main magma reservoir led to normal faulting and the formation of the Lembang fault. This fault, with an impressive scarp, was studied by Tjia [3], who concluded both older dip-slip and younger strike-slip displacement had occurred. The Bandung Basin as seen in (Figure 1) will act to amplify seismic waves if the Lembang fault generates an earthquake. Seismic wave amplification in the Bandung Basin was simulated by Afnimar [6] using Haskell’s method
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