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Geosciences 2018, 8(4), 128; https://doi.org/10.3390/geosciences8040128

Basin Resonance and Seismic Hazard in Jakarta, Indonesia

1
Research School of Earth Sciences, Australian National University, 0200 Canberra, Australia
2
Faculty of Civil and Environmental Engineering, Institut Teknologi Bandung, Jl. Ganesha No. 10, 40122 Bandung, Indonesia
3
Badan Geologi Indonesia, Jl. Diponegoro No. 57, 40122 Bandung, Indonesia
*
Author to whom correspondence should be addressed.
Received: 2 January 2018 / Revised: 22 March 2018 / Accepted: 4 April 2018 / Published: 7 April 2018
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Abstract

We use earthquake ground motion modelling via Ground Motion Prediction Equations (GMPEs) and numerical simulation of seismic waves to consider the effects of site amplification and basin resonance in Jakarta, the capital city of Indonesia. While spectral accelerations at short periods are sensitive to near-surface conditions (i.e., V S 30 , average shear-wave velocity at topmost 30 m of soil), our results suggest that, for basins as deep as Jakarta’s, available GMPEs cannot be relied on to accurately estimate the effect of basin depth on ground motions at long periods (>3 s). Amplitudes at such long periods are influenced by trapping of seismic waves in the basin, resulting in longer duration of strong ground motion, and interference between incoming and reflected waves as well as focusing at basin edges may amplify seismic waves. In order to simulate such phenomena in detail, a basin model derived from a previous study is used as a computational domain for deterministic earthquake scenario modeling in a 2-dimensional cross-section. A M w 9.0 megathrust, a M w 6.5 crustal thrust and a M w 7.0 intraslab earthquake are chosen as scenario events that pose credible threats to Jakarta, and the interactions with the basin of seismic waves generated by these events were simulated. The highest long-period PGVs amplifications are recorded at sites near the middle of the basin and near its southern edge, with maximum amplifications of PGV in the horizontal component of 726% for the crustal, 1500% for the megathrust and 1125% for the deep intraslab earthquake scenario, respectively. We find that the levels of response spectral acceleration fall below those of the 2012 Indonesian building Codes’s design response spectra for short periods (<1 s), but closely approach or may even exceed these levels for longer periods. View Full-Text
Keywords: seismic hazard; openquake; GMPE; basin-induced amplification; SPECFEM2D seismic hazard; openquake; GMPE; basin-induced amplification; SPECFEM2D
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Cipta, A.; Cummins, P.; Irsyam, M.; Hidayati, S. Basin Resonance and Seismic Hazard in Jakarta, Indonesia. Geosciences 2018, 8, 128.

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