Potential analysis of geological disasters "mud volcano" at Boyolali and its surrounding areas based on geomagnetic methods

Abstract

Mud Volcano is a phenomenon often being discussed by people. The emergence of mud volcano in Sidoarjo, East Java, or better recognized as "LUSI"has attracted the attention of researchers and the general community. The effects of infrastructure destruction and environmental damage around the emergence of the Mud Volcano are issues that need special attention. The potential for mud volcano has been recorded in lots of locations in Java, both active and interpreted based on rock deposits. One of the areas indicated to be an ancient mud volcano is the Cengklik Lake area of, Boyolali Regency, Central Java, that is observed in this research. This research was conducted using the geomagnetic method. The investigation was performed around CengklikLake to the east following rock outcrops, which are identified as mud volcano deposits. The interpretation is made based on the results of data processing that have been corrected by daily variation and IGRF. Several filters have been applied to obtain the desired information. The results have shown a low magnetic anomaly value spread from Cengklik Lake, AdiSumarmo Airport on the west side, and continuously spread eastward until around the outcrop, which was identified as ancient volcanic deposits. This pattern of low magnetic anomaly values is interpreted as a result of mud volcano deposits in the area.