Identification of Kaligarang Semarang Fault Based on GGMplus Gravity Data Using First Horizontal Derivative (FHD) and Second Vertical Derivative (SVD) Analysis

Abstract:

Semarang is located in the northern part of Java Island where two tectonic plates meet, making it seismically active and causing the formation of faults. Kaligarang river valley is estimated to be an active fault. The research used FHD and SVD derivative methods, and FFD as a gravity continuation method in the Semarang City area to determine the structure of the Kaligarang fault based on GGMplus satellite data. The derivative analysis was obtained from the residual anomaly. CBA contour map is performed to obtain regional and residual anomaly contour map with moving average method. Furthermore, 2D forward modeling was carried out to describe the layers of geological structures by determining the depth using spectrum analysis. The subsurface structure in the study area consists of 2 types of formations in each of the Line 1, 2 and 3 models, namely the Kaligetas Formation which has an average density of 1.92-2.40 gr/cm³. Then in the second layer is the Kalibeng Formation with an average density range of 2.00-2.21 gr/cm³. Meanwhile, the line 4 modeling is dominated by the Kerek Formation with an average density of 2.21-2.55 gr/cm³. The fault structure boundaries identified based on FHD analysis are located around coordinates 9215536.4 UTM Y on Line 1, 9217402.4 UTM Y on Line 2, 9220103.6 UTM Y on Line 3, and 9221429.6 UTM Y on Line 4. Based on the SVD analysis, the type of faults that can be identified along Kaligarang River is a thrust fault.

• Periodical: Engineering Innovations (Volume 16)
• Pages: 63-73
• DOI: https://doi.org/10.4028/p-JoB4sY
• Online since: January 2026
• Authors: Supriyadi Supriyadi, Nita Oni Indriani*, Khumaedi Khumaedi
• Keywords: FHD, GGMplus, SVD

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