PEMODELAN LAPISAN BAWAH PERMUKAAN KOTA BENGKULU DENGAN INVERSI HVSR

Research on the determination of subsurface structures in Bengkulu City based on inversion of the
Horizontal to Vertical Spectral Ratio (HVSR) method from microtremor measurement data. Data
acquisition was carried out with Gemini 2 SN 1405 PASI Mod Seismometer for 30 minutes for each
station. This study aims to obtain subsurface structure based on microtermor data inversion.
Microtermor data is processed using Geopsy software to obtain H / V spectral which is then reversed
using OpenHVSR with the principle of forward modeling to obtain subsurface shear wave velocity (Vs)
models at each measurement point. Subsurface models can be accepted and considered true with a high
degree of confidence if the selected model produces H / V spectral in accordance with field data marked
by small errors, where the field data curves and models can coincide. From this research, the value of Vs
below the surface to a depth of 50 meters varies from 26 m / s to 2195 m / s consisting of 6 layers to 8
layers of rock