The geoelectric method using Schlumberger configuration is one of the most widely used geophysical methods. In this study, a one-dimensional Schlumberger configuration will be applied to modeling the subsurface structure using two types of data, namely synthetic data and acquisition data in the field. The purpose of this study is to calculate resistivity (ρi) and determine the thickness (di) of the subsurface layer. In order for the model to be obtained to have a high level of accuracy, inversion least square is used. The value of resistivity and layer thickness obtained are very close to the synthetic model used. Comparison of calculation pseudo resistivity curves and observation pseudo resistivity has a small RMS error value which supports the accuracy of the study. This is obtained by giving initial guesses to the resistivity value of the acquisition data. The final results obtained from this study are in the form of five layers with different resistivity values and with a relatively small RMS error value of 1.15.
The area of Sulawesi, especially along the Palu Koro Fault, is an area that is largely influenced by the confluence and movement of plates as well as regional fault activity pathways with high levels of seismicity. Determining the location of the hypocenter accurately through relocation is required in identifying the detailed tectonic structures in the area. Relocation of the hypocenter using the Modified Joint Hypocenter Determination (MJHD) method using the IASP91 velocity model in the period August to October 2018 with the arrival time data from BMKG catalog. The results of hypocenter relocation using the MJHD method show that from 132 earthquake distribution points to 63 earthquake hypocenter points after the relocation. The change in the location of the hypocenter was much denser along the Palu Koro Fault route than before the relocation as evidenced by the mean value of rms (root mean square) before relocation was 1.31 and after relocation it became smaller (0.61). Changes in parameter values after relocation using the MJHD method caused the distribution of the earthquake hypocenter to be tighter towards the Palu Koro fault than before the relocation, where the distribution had a random and scattered pattern.
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