• International Journal of Technology (IJTech)
  • Vol 8, No 6 (2017)

Investigation of Subsurface Characteristics by using a Vs30 Parameter and a Combination of the Hvsr and Spac Methods for Microtremor Arrays

Sigit Pramono, Widjojo Prakoso, Astri Rahayu, Ariska Rudyanto, Fajri SukurRahmatullah, sofian Piandatte, Phil Cummins

Corresponding email: sigit_muslim@yahoo.com

Published at : 27 Dec 2017
Volume : IJtech Vol 8, No 6 (2017)
DOI : https://doi.org/10.14716/ijtech.v8i6.682

Cite this article as:

Pramono, S., Prakoso, W.A., Cummins, P., Rahayu, A., Rudyanto, A., Syukur, F., Sofian, 2017. Investigation of Subsurface Characteristics by using a Vs30 Parameter and a Combination of the Hvsr and Spac Methods for Microtremor Arrays. International Journal of Technology. Volume 8(6), pp. 983-992

Sigit Pramono - Civil Engineering Department, Indonesia University
Widjojo Prakoso Indonesia Universitry
Astri Rahayu Indonesia University
Ariska Rudyanto BMKG
Fajri SukurRahmatullah BMKG
sofian Piandatte BMKG
Phil Cummins ANU
Email to Corresponding Author


Palu City is an active seismic area in Indonesia due to the very active Palu-Koro fault system. The development of the city area, therefore, must consider the risks induced by the seismic activities. The risk assessment has to be supported by information on subsurface characteristics. The aim of this study is to investigate the characteristics of the subsurface of the area by considering the value of Vs30 (top 30 m shear-wave velocity). This parameter has been related to the estimation of the site’s ground shaking during the occurrence of an earthquake. The measurements taken in the deep soil sediment include the microtremor array, using the spatial auto correlations (SPAC) method, as well as the site’s dominant period measurement, using the horizontal-to-vertical spectral ratio (HVSR) method. All these parameters were local site parameters, which could be subsequently related to a description of the potential impact in an area near to the epicenter. The measurement of Vs30 was conducted in collaboration between the Indonesian Agency for Meteorology, Climatology, and Geophysics (Badan Meteorologi, Klimatologi, dan Geofisika) (BMKG) and the University of Indonesia (Universitas Indonesia) (UI); the overall surveys included Vs30 measurements at 44 sites, microtremor array surveys at 10 sites, and the dominant period measurements at 74 sites. The overall results indicated that there is a good correlation between Vs30 and the dominant period. In general, Palu City is predominantly a class-D site, but the northwest part of the Palu area is a class-C site.

HVSR; Microtremor array; Vs30; SPAC


Annual Report of Palu BMKG Geophysics Station. 2016

Asten, M., 2006. On Bias and Noise in Passive Seismic Data From Finite Circular Array Data Processed Using SPAC Methods. Geophysics, Volume 71(6), pp. V153–V162

Asten, M., Dhu, T., Lam, N., 2004. Optimised Array Design for Microtremor Array Studies Applied to Site Classification; Comparison of Results with SCPT Logs. In: 13th World Conference on Earthquake Engineering, Paper No.2903, Vancouver, B-C, Canada

Field, E.H., Jacob, K.H., 1993. The Theoretical Response of Sedimentary Layers to Ambient Seismic Noise. Geophys. Res. Let., Volume 20, pp. 2925–2928

Hamilton,W., 1979. Tectonic of the Indonesian Region. Report., U.S. Geological Survey Professional Paper 1078

Kesarwani, A., Sharma, A., Jain, C., 2012. MASW versus Refraction Seismic Method in terms of Acquisition and Processing of Data and the Accuracy of Estimation of Velocity Profiles. The 9th Biennial International Conference & Exposition on Petroleum Geophysics, Hyderabad 2012, pp. 1–5

Lermo, J., Francisco, S., Chavez-Garcia, J., 1992. Site Effect Evaluation using Microtremors: A Review (Abstract). EOS, Volume 73, p. 352

Nakamura, Y., 1989. A Method for Dynamic Characteristics Estimation of Subsurface using Microtremor on the Ground Surface. Quarterly Report of RTRI, Volume 30(1), pp. 25–33

Nakamura, Y., 2008. On the H/V Spectrum. WCEE 14th October 2008, Beijing-Cina

Nogoshi, M., Igarashi, T., 1970. On the Propagation Characteristics of Microtremors. J. Seism. Soc, Japan 23, pp. 264–280 (in Japanese with English abstract)

Ohmachi, T., Nakamura, Y., Toshinawa, T. 1991. Ground Motion Characteristics in the San Francisco Bay Area Detected by Microtremor Measurements. In: Proceeding 2nd. Int. Conf. on Recent Adv. in Geot. Earth. Eng. and Soil Dyn., 11-15 March, St. Louis, Missouri: pp. 1643–164

Park, C.B., Miller, R.D., Xia, J., 1999. Multichannel Analysis of Surface Waves. Geophysics, Volume 64(3), pp. 800–808

Ridwan, M., Widiyantoro, S., Afnimar, Irsyam, M., 2013. Identification of Engineering Bedrock in Jakarta by using Array Observations of Microtremors. In: The 3rd International Symposium on Earthquake and Disaster Mitigation, Procedia Earth and Planetery Science Elsevier

Roca, A., Oliveira, C.S., Ansal, A., Figueras, S., 2006. Local Site Effects and Microzonation. Assessing and Managing Earthquake Risk. Springer Netherlands, Amsterdam, pp. 67–89

Sulastri, M., Soehami, A., Muslim, D., 2016. Earthquake in Palu Areas as an Indication of Active Faults in Palu-koro, Central Sulawesi, Indonesia. FIG Working Week in 2016 Recovery from Disaster. Christchurch-NewZealand

Thein, P.S., Pramumijoyo, S., Brotopuspito, K.S., Kiyono, J., Wilopo, W., A. Furukawa, A. Setianto., 2014. Estimation of Seismic Ground Motion and Shaking Palu City, Central Sulawesi Province, Indonesia. World Academy of Science, Engineering and Technology International Journal of Geological and Environmental Engineering, Volume 8(5), pp. 308–319.

Zhao, J.X., Irikura, K., Zhang, J., Fukushima, Y., Somerville, P.G., Asano, A., Ohno, Y., Oouchi, T., Takahashi, T., Ogawa, H., 2006. An Empirical Site-classification Method for Strong-motion Stations in Japan using H/V Response Spectral Ratio, Bull. Seismol. Soc. Am., Volume  96, pp. 914–925