TY - JOUR AU - Nazli Ismail, AU - Marwan, AU - Muhammad Syukri, AU - Rinaldi Idroes, PY - 2019/01/30 Y2 - 2024/03/29 TI - DEEP AND SHALLOW STRUCTURES OF GEOTHERMAL SEULAWAH AGAM BASED ON ELECTROMAGNETIC AND MAGNETIC DATA JF - GEOMATE Journal JA - INTERNATIONAL JOURNAL OF GEOMATE VL - 16 IS - 53 SE - Articles DO - UR - https://geomatejournal.com/geomate/article/view/2815 SP - 141-147 AB - <p>Indonesia is a country with the largest geothermal reserves in the world, but exploration and <br>utilization of geothermal energy are still low. As an effort in increasing exploration process, an integrated <br>geophysical method to image the subsurface structure of the geothermal system has been done at Seulawah <br>Agam Geothermal Field, Aceh Province, Indonesia. Very low frequency (VLF-R) method was used for shallow<br>and magnetotellurics method for deep structures studies in the area. The magnetic method was used for a <br>complementary of the electromagnetic methods. Magnetotelluric data were acquired at ten stations along a 30 <br>km distance profile crossing the Seulawah Agam volcano in a north-south direction. The VLV-R and Magnetic <br>stations were measured on the Ie Ju manifestation area only, located at the northern slope of the volcano. The <br>magnetic and VLF-R methods have been able to investigate the local structure, while the regional structure of <br>subsurface is described by the magnetotelluric method. 2D resistivity model of magnetotelluric data shows a <br>conceptual model of the geothermal system based on resistivity variation. The model also reveals two local <br>faults crossing the volcano in a northwest-southeast direction. Most of the geothermal manifestations in <br>Seulawah Agam are controlled these faults. Application of VLF-R and magnetic methods on the Ie Ju <br>manifestation area has shown clearly near surface structures of the area. The inverted models have strong<br>agreement with a reduction to the pole of total magnetic field anomalies. Presence of the conductors in the <br>resistivity models coincides with low total magnetic field anomalies. In addition, the total magnetic field <br>anomalies map can be also used to locate the presence of geothermal manifestation with or without their <br>appearance on the surface.</p> ER -