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Book Chapter

Development of an engineering bedrock map beneath Jakarta based on microtremor array measurements

By
M. Ridwan
M. Ridwan
Graduate Research on Earthquakes and Active Tectonics, Faculty of Earth Science and Technology, Institut Teknologi Bandung, Jalan Ganesa No. 10, Bandung 40132, IndonesiaResearch Institute for Human Settlements, Ministry of Public Works, Jalan Panyaungan, Cileunyi Wetan, Kabupaten Bandung 40393, Indonesia
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S. Widiyantoro
S. Widiyantoro
Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jalan Ganesa No. 10, Bandung 40132, IndonesiaResearch Centre for Disaster Mitigation, Institut Teknologi Bandung, Jalan Ganesa No. 10, Bandung 40132, Indonesia
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M. Irsyam
M. Irsyam
Research Centre for Disaster Mitigation, Institut Teknologi Bandung, Jalan Ganesa No. 10, Bandung 40132, IndonesiaFaculty of Civil and Environment, Institut Teknologi Bandung, Jalan Ganesa No. 10, Bandung 40132, Indonesia
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Afnimar
Afnimar
Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jalan Ganesa No. 10, Bandung 40132, Indonesia
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H. Yamanaka
H. Yamanaka
Department of Environmental Science and Technology, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
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Published:
January 01, 2017

Abstract

Jakarta has been selected as a study area for seismic microzonation by considering its population and its infrastructure growth, seismicity and geological setting. One of the important factors in seismic hazard analysis is the characteristics of the ground overlying bedrock, and, as yet, this has not been studied for Jakarta. This study was intended to estimate the depth to bedrock by applying microtremor array exploration. The phase velocity of microtremors was estimated by the spatial autocorrelation (SPAC) method, whereas the S-wave velocity profile was estimated by inversion using a genetic algorithm. Microtremor array analysis has been conducted at 55 sites that covered the whole of Jakarta. The result of one-dimensional (1D) S-wave velocity profile estimation indicates that the engineering bedrock depth has pronounced differences between northern (>700 m) and southern Jakarta (about 300 m). A 3D S-wave velocity model was constructed from 1D profiles resulting from a second inversion in which the depth of constant-velocity layers, with velocities of 500, 700 and 900 m s−1, was determined. The constructed 3D velocity structures show a bedrock morphology that has a depth range of 350–725 m, with depths increasing towards northern Jakarta. The implication of differences in bedrock depth is that estimated seismic amplification for the thicker sediment will be higher.

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Contents

Geological Society, London, Special Publications

Geohazards in Indonesia: Earth Science for Disaster Risk Reduction

P. R. Cummins
P. R. Cummins
Australian National University, Australia
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I. Meilano
I. Meilano
Bandung Institute of Technology, Indonesia
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The Geological Society of London
Volume
441
ISBN electronic:
9781862399709
Publication date:
January 01, 2017

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