Geomagnetic Map of Field Camp Geophysics in Karangsambung using Data Acquisition 2005-2017

The implementation of field activities in Karangsambung by geophysical engineering ITB has been done since 1996 until 2017. During the field study activities, students conducted acquisition activities with several geophysical methods, one of the most consistent is the acquisition of geomagnetic data. Compilation of geomagnetic data during Karangsambung field activities will be presented in this work. There are 3 data categories during 22 years of geomagnetic survey: data compilation 1996-1999, 2000-2004, and 2005-2017. In this work, we use survey 2017 as refferences (datum) for other surveys (2005-2016). Geomagnetic observation around the base (LIPI campus) consists of 3632 data showing geomagnetic field trends that decreases with a rate of change of -11 nT / year. Merge data provide geomagnetic map in the range of total intensity from 41371 to 46799 nT. Data distribution from field camp surveys already cover some geological surface map (Diabas Intrusion, Totogan Formation, Karangsambung Formation, and Luk-Ulo Melange Complex). The pattern of total intensity curve shows higher noise of magnetic properties in the Karangsambung Formation and Luk-ulo Melange Complex that close to the Diabas Intrusion.