COMPARISON OF MEASURED AND ESTIMATED SHEAR-WAVE VELOCITY (VS30) FOR GUNUNGKIDUL AND KLATEN AREAS
Date
2016-08-01Author
RAHAYU, ASTRI
PRAKOSO, WIDJOJO ADI
SADISUN, IMAM A.
MUZLI, MUHAMMAD
RUDYANTO, ARISKA
MUNTOHAR, AGUS SETYO
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The shearwave velocity over the top 30 m subsoil (Vs30) is an important assessment parameter of seismic ground surface
motion. The 30 m top layer of soil is the closest to the structure of the building, and could have different effects
depending on the type of soil and topography. The Indonesian earthquake code for building and non building structures
known as SNI 1726-2012 uses the directly measured Vs30 as the primary parameter to identify the stiffness effect of
sediment. The Vs30 can be measured using non invasive methods, such as multi-channel analysis of surface waves
(MASW). This research was carried out by correlating the Vs30 obtained from series of MASW tests with estimated Vs30
values obtained using the Wald-Allen method and the geologic age based method. The former used the Shuttle Radar
Topography Mission (SRTM) 30 arcsec data, and the topographic slope was evaluated using GIS software to estimate
Vs30. The latter used the data in the geologic map available. The research was focused in the Yogyakarta and Central Java
area. The Wald-Allen method appeared to be more suitable for flat, low elevated area like Klaten (Central Java), while in
the geologic age based method appeared to be more suitable for high elevated area like Panggang (Yogyakarta).