The Preliminary Result of Dominant Frequency Profile and Seismic Hazard Estimation In Penajam Paser Utara Using HVSR Method Mawadah A. (1), Zulfakriza Z. (2), Widiyantoro S. (2,3), Supendi P. (4,5), Husni Y.M (6), Lesmana A. (6)
1) Earth Science Graduate Program, Faculty of Earth Science and Technology, Bandung Institute of Technology, Indonesia.
2) Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Bandung Institute of Technology, Indonesia.
3) Faculty of Engineering, Maranatha Christian University, Bandung 40164, Indonesia.
4) Agency for Meteorology, Climatology, and Geophysics (BMKG), Jakarta 10720, Indonesia.
5) Department of Earth Sciences, Bullard Labs, University of Cambridge, Cambridge CB3 0EZ, UK.
6) Geophysical Engineering, Faculty of Mining and Petroleum Engineering, Bandung Institute of Technology, Indonesia.
*e-mail: anismawadah12[at]gmail.com
Abstract
Sepaku Sub-district, which is located in Penajam Paser Utara Regency, East Kalimantan has been designated as the new capital city of Indonesia. One of the reasons for choosing this area was due to the lack of potential for natural disasters, especially earthquakes. However, based on the historical records of seismicity, several destructive earthquakes have occurred in East Kalimantan. Therefore, a study of the characteristics of local site is needed in order to assess the earthquake hazard potential in Penajam Paser Utara. In this study, the Horizontal to Vertical Spectral Ratio (HVSR) method was applied by utilizing microtremor data from 21 seismometers installed at the study area. The results of the HVSR analysis are the dominant frequency (f0) and amplification (A0) values obtained from the H/V curve. Based on the preliminary result, the highest f0 in the study area is 14.39 Hz and the lowest is 0.58 Hz. Meanwhile, the highest value for A0 is 6.41 and the lowest value is 1.25.
