IDENTIFIKASI DAERAH RAWAN GERAKAN TANAH DI KOTA LIWA, LAMPUNG BARAT MENGGUNAKAN METODE GEORADAR DAN GEOLISTRIK; IDENTIFICATION AREA OF MASS MOVEMENT IN LIWA, LAMPUNG BARAT BY USING GEORADAR AND GEOELECTRICITY METHOD

YUSRAIDA KHAIRANI DALIMUNTHE, Sismanto

2014 | Disertasi | PROGRAM STUDI S-2 FISIKA

Georadar method with radar reflection profiling configuration and geoelectrical method with dipole-dipole configuration has been done to determine the lithology, fracture characteristics of weak zone or fault that could potentially result of mass movement in Liwa, Lampung Barat. This research was conducted in 11 lines. Reflexwave software has been used in georadar data processing obtained from the result of GSSI surveyor 20 measurements. There are six steps to process the data measurement, conversion time to depth, automatic gain control, deconvolution, diffraction stack, migration and static correction to eliminate noise from the data in order to obtain radargram section. In addition, Earthimager 2DINV software has been used in geoelectrical processing data from the measurement of multichannel supersting R8. Inversion from apparent resistivity to actual resistivity has been conducted to interpret subsurface section. The identified mass movement in this research have been indicated by the result of both methods the mass movement by line 1, 2, 5 with the type of translation mass movement and line 5, 7, 8 with the type of creep mass movement. Liwa subsurface structure is arranged by quartenary sediment, clay (1- 100 ?m), sand (8 – 4000 ?m) and igneous rock, granit ( 5.000 – 1.000.000 ?m) and from the results of the data analysis found that indication of a weak zone of the fault by line 1, 2, 3, 5, 6.

Kata Kunci : Gerakan tanah; kekar; sesar; georadar; geolistrik