PEMODELAN KECEPATAN MEDIUM BAWAH PERMUKAAN BLEDUG KUWU DENGAN METODE SPATIAL AUTOCORRELATION (SPAC); VELOCITY MODELLING OF BLEDUG KUWU’S SUBSURFACE USING SPATIAL AUTOCORRELATION METHOD

Putrantri, Anisa Budi, Wiwit Suryanto

2015 | Disertasi | FMIPA

Velocity modelling of Bledug Kuwu’s subsurface medium by using spatial autocorrelation (SPAC) method. The data was recorded by a three-component short-period seismometer type TDV-23S. We use a triangle configuration of the station for SPAC angular. The velocity model of the site was obtained from the crosscorrelation between the stations and from each station was autocorrelation as reference’s station. The variation of velocity as a function of frequency which is then inverted into the model of velocity as a function of depth. Based on the analysis of the model, it show that there are two subsurface rock layering of Bledug Kuwu, the first layer with the value of Vp approximately 1600 m/s and the value of Vs approximately 300 m/s to about 80 meters depth, and the second layer with the value of Vp approximately 2800 m/s and the value of Vs approximately 500 m/s at a depth more than 80 meters.

Kata Kunci : Bledug Kuwu; velocity model; Spatial Autocorrelation method (SPAC)