ESTIMATION OF SEISMIC VULNERABILITY INDEX OF BUNGKUTOKO ISLAND KENDARI CITY,
USING DOMINANT FREQUENCY AND AMPLIFICATION FACTOR OF MICROTREMOR DATA-HVSR METHOD


FISRANI
F1H114012

Department Of Geophysical Engineering, Faculty of Earth Sciences and
Technology,
Halu Oleo University
fisranigeofisika@gmail.com


ABSTRACT

Processing of microtremor data is one method that can be used estimate the sesimic vurnerability index. In this research, microtremor measurements were carried out in Bungkutoko Island Kendari City with the primary objective to estimate seismic vulnerability index. Microtremor measurements were carried out at 18 different points using the seismometer TDL-303S (3 components). Microtremor data were then processed in the software of Geopsy 2.9.1 by applying the Horizontal to Vertical Spectral Ratio (HVSR) method. The H/V curve be obtained from these processing results were used to analyze the dominant frequency value (f0) and amplification factor (A0). Furthermore, it was used to estimate the seismic vulnerability index (Kg) of the dominant frequency (f0) and amplification factor (A0). The results showed that the dominant frequency (f0) were of 0.706485 to 3.67744 Hz, and the amplification factor (A0) were 2.95594 to 5.47822. The seismic vulnerability index in the research location were arround 5.656771 to 24.24535 s2/cm.

Keyword: Microtremor, HVSR method, dominant frequency, amplification factor, Seismic Vulnerability Index