Gravity Data Decomposition through Upward Continuation and Wavelet Transform, Case Study at Muria Peninsula, Java Island, Indonesia

The separation of regional and residual anomalies is a challenge in gravity data analysis. This study offers a new perspective by comparing gravity anomaly separation using the upward continuation method and wavelet transformation. This study uses airborne gravity measurements from the Indonesian Geospatial Information Agency survey in the Muria Peninsula. Airborne gravity data in the form of Free Air Anomaly (FAA) is corrected for Bouguer and terrain effects to produce the Complete Bouguer Anomaly (CBA). The CBA is then processed using both upward continuation and wavelet transformation to obtain regional and residual anomalies. The results show that regional and residual anomalies derived from the upward continuation and wavelet transformation methods yield similar values. Regional anomalies range from 17 to 38 mGal, while residual anomalies range from -85 to 35 mGal. The regional anomaly obtained through wavelet transformation successfully detects deeper anomalous sources, particularly the magma conduit between Mount Muria and Mount Genuk. Residual anomalies identified using wavelet transformation reveal shallow anomalous structures, including calderas and maars around Mount Muria, the Patiayam Formation at Mount Genuk, and local faults in the Rembang Fold Zone. Keywords: Gravity airborne, regional and residual anomaly, upward continuation, wavelet transform, Muria Peninsula