Open AccessSubsurface Structure around Mas Crater of Papandayan Volcano based on Magnetotelluric and Geomagnetic Data
Author(s) -
Dieno Diba,
Nurhasan Nurhasan,
Doddy Sutarno,
Yasuo Ogawa
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1949/1/012013
Subject(s) - magnetotellurics , fumarole , geology , impact crater , volcano , geophysics , hydrothermal circulation , earth's magnetic field , resistive touchscreen , depth sounding , petrology , seismology , electrical resistivity and conductivity , magnetic field , oceanography , physics , astronomy , quantum mechanics , electrical engineering , engineering
Papandayan is a hydrothermally active volcano in Indonesia. We revealed the subsurface structure around the Mas Crater area of Papandayan based on the magnetotelluric (MT) and geomagnetic (GM) method. For the MT method, 14 sounding stations were deployed and two of them are located close to the active fumaroles. We estimated the MT response functions using a remote reference and then modeled the data with the aid of a 1-D robust inversion. The resistivity structure can generally be divided into three layers, namely a thin resistive surface layer, a middle conductive layer, and a more resistive basement. We interpreted the middle layer to be the hydrothermal zone or clay mineral. For the GM method, we measured the total intensity at 19 data points. The IGRF and diurnal variation were subtracted from the raw data. We then obtained the 2-D magnetic susceptibility model of magnetic field anomaly using an Occam inversion. The model shows a significantly low susceptibility structure beneath the fumaroles which might correlate with thermally demagnetized rocks.