Investigation of distribution of embedded shallow structures using the first order vertical derivative of gravity data

• Synthetic models were created for detecting the effectiveness of the method.
• Answers of the individual models were evaluated and their profiles were created.
• Results indicated that the method is useful for detecting the shallow structures.
• The study area which is covered by the sediments was selected to apply the method.
• Distributions of embedded shallow materials were determined by the method.

The utilization of the first order vertical derivative method, applied to a gravity field, in the determination of relatively low density and high density areas within the same unit can be helpful, defining such areas. In this study, the first order vertical derivative method was first applied to synthetic data and the workability of the method was investigated by creating scenarios having different densities within the same unit. Later, to compare the result of the scenarios, Adala-Manisa/Turkey and surroundings having a volcanic history were selected because of the existence of underground structures formed as a result of embedded volcanic areas. Real data set was obtained by using Scintrex CG-5 and Leica 1200 + GNSS for investigating the geological structure of the Adala-Manisa, at 400 stations. After the gravity reduction process the residual gravity anomaly values of the Adala-Manisa were obtained by removing a first order regional trend from the Bouguer gravity map. In the following process, the first order vertical derivative method was applied to the residual anomaly map. Thus, results of the synthetic anomalies and real data anomalies were compared and discussed by using the residual Bouguer gravity anomaly map. Consequently, the first order vertical derivative application in the determination of suppressed and undefinable shallow weak resources in the same media as Alluvial Fans and Alluvium units, especially on the Bouguer gravity anomaly map produces acceptable effective results.

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