Adi Susilo, Sunaryo Sunaryo
Geomagnetic research has been conducted in Sidoarjo Mud Volcano (LUSI = Lumpur Sidoarjo, Sidoarjo Mud), Sidoarjo District, East Java, Indonesia. This mud volcano has a significant impact both on the surface, the environment and on subsurface conditions. The investigation and evaluation of the impact of subsurface structures are not widely known. Approximately 300 magnetic data were collected in the surrounding area of 3.5km x 3km. The data field measurement results are called total magnetic field anomaly ranging from -173.2 nT to 539.6 nT. After all, corrections were made, the results of the residuala anomaly were between -421.7 nT and 265.5 nT. Quantitative modeling/interpretation is done by connecting a pair of dipole grip (magnetic is a dipole, while gravity is a monopole). There are three subsurface modeling sections: SP1N, SPN and SP2E. Susceptibility of rock modeling results shows ranges between -0.066 SI to 0.076 SI. The modeling results also indicate the presence of local fault lead Northwest to the Southeast and from Southwest to the Northeast. Local fault indications are located in the west and east of the study site at a depth of approximately 1.5 km below the surface. Through this local fault, it is possible that the mud can come out to the surface. © 2018 Disaster Advances. All Rights Reserved.
Geophysical Engineering, Physics Department, Faculty of Sciences, Brawijaya University, Jln. Veteran, Malang, East Java, 65145, Indonesia
