Exploration Geophysics Exploration Geophysics Society
Journal of the Australian Society of Exploration Geophysicists
RESEARCH ARTICLE

Microtremor exploration for shallow S-wave velocity structure in Bandung Basin, Indonesia

Andi Muhamad Pramatadie 1 6 Hiroaki Yamanaka 1 Kosuke Chimoto 1 Afnimar 2 Kazuki Koketsu 3 Minoru Sakaue 3 Hiroe Miyake 3 I Wayan Sengara 4 Imam A. Sadisun 5
+ Author Affiliations
- Author Affiliations

1 The Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, Kanagawa 226-8502, Japan.

2 Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jalan Ganesha no. 10, Bandung 40132, Indonesia.

3 Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan.

4 Faculty of Civil and Environment Engineering, Institut Teknologi Bandung, Jalan Ganesha no. 10, Bandung 40132, Indonesia.

5 Faculty of Earth Science and Technology, Institut Teknologi Bandung, Jalan Ganesha no. 10, Bandung 40132, Indonesia.

6 Corresponding author. Email: pramatadie.a.aa@m.titech.ac.jp

Exploration Geophysics 48(4) 401-412 https://doi.org/10.1071/EG16043
Submitted: 12 April 2016  Accepted: 18 April 2016   Published: 31 May 2016
Originally submitted to SEGJ 14 July 2015, accepted 14 February 2016  

Abstract

We have conducted a microtremor survey for shallow S-wave velocity profiles to be used for seismic hazard evaluation in the Bandung Basin, Indonesia. In the survey, two arrays were deployed temporarily at each of 29 sites, by installing seven vertical sensors in triangular configurations with side lengths from 1 to 16 m. Records of vertical microtremors from each array were used to estimate Rayleigh wave phase velocity spectra using the spatial autocorrelation method, as well as the horizontal-to-vertical spectral ratio obtained at the centre of the arrays. Phase velocities at sites on the basin margin exhibit higher values than those obtained in the central part of the basin, in a frequency range of 7 to 30 Hz. The phase velocity data were used to deduce S-wave velocity profiles of shallow soil using a hybrid heuristic inversion method. We validated our inversion models by comparing observed horizontal-to-vertical spectral ratios with ellipticities of the fundamental mode of Rayleigh waves, calculated for the inversion models. The S-wave velocity profiles in the area can be characterised by two soft layers over a firm engineering basement that has an S-wave velocity of 500 m/s. The S-wave velocities of the two layers are 120 and 280 m/s on average. The distribution of the averaged S-wave velocity in the top 30 m clearly indicates low values in the eastern central part and high values in the edge of the basin. The amplification is large in the areas with low velocity layers. In addition, we have proposed an empirical relation between the amplification factor and the topographical slope in the area.

Key words: amplification, Bandung Basin, microtremor exploration, phase velocity, S-wave velocity, shallow soil.


References

Afnimar, , 2014, Estimation of SH-wave amplification in the Bandung Basin using Haskell’s method: Journal of Engineering and Technological Sciences, 46, 93–101
Estimation of SH-wave amplification in the Bandung Basin using Haskell’s method:CrossRef |

Afnimar, , Yulianto, E, and Rasmid, , 2015, Geological and tectonic implication obtained from first seismic activity investigation around Lembang fault: Geoscience Letters, 2, 1–11

Brahmantyo, B., 2005, Geologi cekungan Bandung: Institut Teknologi Bandung [in Indonesian].

Dam, M. A. C., 1994, The Late Quaternary evolution of the Bandung Basin, West Java, Indonesia: Ph.D. thesis, Vrije Universiteit Amsterdam.

Dam, M. A. C., and Suparan, P., 1992, Geology of the Bandung Basin: Special Publication No. 13, Geological Research and Development Center, Bandung, Indonesia.

Dam, M. A. C., Suparan, P., Nossin, J. J., Voskuil, R. P. G. A., and Group, G. T. L., 1996, A chronology for geomorphological developments in the greater Bandung area, West-Java, Indonesia: Journal of Southeast Asian Earth Sciences, 14, 101–115
A chronology for geomorphological developments in the greater Bandung area, West-Java, Indonesia:CrossRef |

Daryono, M. R., and Natawidjaja, D. H., 2015, Lembang Active fault study using high resolution digital elevation model (DEM) image: Poster session presented at Geotechnology Science Week, Research Centre for Geotechnology, Indonesia Institute of Science, Bandung, Indonesia.

Farr, T. G., and Kobrick, M., 2000, Shuttle radar topography mission produces a wealth of data: Eos, Transactions, American Geophysical Union, 81, 583–585
Shuttle radar topography mission produces a wealth of data:CrossRef |

Grutas, R., and Yamanaka, H., 2012, Shallow shear-wave velocity profiles and site response characteristics from microtremor array measurements in Metro Manila, the Philippines: Exploration Geophysics, 43, 255–266
Shallow shear-wave velocity profiles and site response characteristics from microtremor array measurements in Metro Manila, the Philippines:CrossRef |

Handayani, L., Mulyadi, D., Wardhana, D. D., and Nur, W. H., 2009, Maximum of the peak ground acceleration (PGA) in the Bandung Basin area: Study case Lembang Fault earthquake: Geo-Hazards, 19, 333–337

Haskell, N. A., 1953, The dispersion of surface waves on multilayered media: Bulletin of the Seismological Society of America, 43, 17–34

Hudson, D. E., and Housner, G. W., 1958, An analysis of strong motion accelerometer data from the San Francisco earthquake of March 22, 1957: Bulletin of the Seismological Society of America, 48, 253–268

Kitsunezaki, C., Goto, N., Kobayashi, Y., Ikawa, T., Horike, M., Saito, T., Kuroda, T., Yamane, K., and Okuzumi, K., 1990, Estimation of P-and S-wave velocities in deep soil deposits for evaluating ground vibrations in earthquake: Journal of Japan Society for Natural Disaster Science, 9, 1–17

Kudo, K., Kanno, T., Okada, H., Ozel, O., Erdik, M., Sasatani, T., Higashi, S., Takahashi, M., and Yoshida, K., 2002, Site-specific issues for strong-ground motions during the Kocaeli, Turkey, earthquake of 17 August 1999, as inferred from array observations of microtremors and aftershocks: Bulletin of the Seismological Society of America, 92, 448–465
Site-specific issues for strong-ground motions during the Kocaeli, Turkey, earthquake of 17 August 1999, as inferred from array observations of microtremors and aftershocks:CrossRef |

Meilano, I., Abidin, H. Z., Andreas, H., Gumilar, I., Sarsito, D., Hanifa, R., Rino, , Harjono, H, Kato, T, Kimata, F, and Fukuda, Y, 2012, Slip rate estimation of the Lembang fault West Java from geodetic observation: Journal of Disaster Research, 7, 12–18

Nogoshi, M., and Igarashi, T., 1971, On the amplitude characteristics of microtremor (Part 2): Journal of the Seismological Society of Japan, 24, 26–40

Okada, H., 2003, The microseismic survey method: Geophysical Monograph Series No. 12, Society of Exploration Geophysicists.

Takekoshi, M., and Yamanaka, H., 2009, Waveform inversion of shallow seismic refraction data using hybrid heuristic search method: Exploration Geophysics, 40, 99–104
Waveform inversion of shallow seismic refraction data using hybrid heuristic search method:CrossRef |

Wald, D. J., and Allen, T. I., 2007, Topography slope as a proxy for seismic site conditions and amplification: Bulletin of the Seismological Society of America, 97, 1379–1395
Topography slope as a proxy for seismic site conditions and amplification:CrossRef |

Wells, D. L., and Coppersmith, K. J., 1994, New empirical relationships among magnitude, rupture length, rupture width, rupture area, and surface displacement: Bulletin of the Seismological Society of America, 84, 974–1002

Wessel, P., and Smith, W. H. F., 1991, Free software helps map and display data: Eos, Transactions, American Geophysical Union, 72, 441–446
Free software helps map and display data:CrossRef |

Yamanaka, H., 2007, Inversion of surface-wave phase velocity using hybrid heuristic search method: Geophysical Exploration (Butsuri Tansa), 60, 265–275
Inversion of surface-wave phase velocity using hybrid heuristic search method:CrossRef |

Zaineh, H. E., Yamanaka, H., Dakkak, R., Khalil, A., and Daoud, M., 2012, Estimation of shallow S-wave velocity structure in Damascus city, Syria, using microtremor exploration: Soil Dynamics and Earthquake Engineering, 39, 88–99
Estimation of shallow S-wave velocity structure in Damascus city, Syria, using microtremor exploration:CrossRef |



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