Analysis of the Relationship Between Microtremor Dominant Frequency and Topographic Features
Bambang Wijatmoko, Hendarmawan, dan Yudi Rosandi

Universitas Padjadjaran

Abstract

The relationship between surface topography and dominant frequency obtained from microtremor measurements offers valuable insight into seismic site conditions. This study aims to analyze how variations in topographic features influence the spatial distribution of dominant frequencies. Microtremor data were collected across multiple points with diverse topographic settings, including ridges, slopes, and valleys. The Horizontal-to-Vertical Spectral Ratio (HVSR) method was employed to determine the fundamental frequency at each measurement point. The results show a clear trend: valley areas tend to exhibit higher dominant frequency values, while lower values are associated with ridge-like features. This suggests that topographic configuration may play a significant role in the amplification and resonance behavior of seismic waves, likely due to variations in subsurface sediment geometry induced by surface morphology. The findings highlight the potential of using microtremor analysis as a rapid and non-invasive tool to assess subsurface conditions and their relationship to surface features. This approach can contribute to better seismic hazard assessment and land use planning, especially in areas where detailed geotechnical data are not available.

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Topic: Earth Physics and Space Science