Identification of Subsurface Structures of Geothermal Potential Area in East of Mount Lawu Using The Gravity Method

Sorja Koesuma, Mela Budiani Septianingsih, Budi Legowo

Abstract

Information about the eastern side subsurface stones of Mount Lawu regarding geothermal potential is limited. This research was conducted to provide information regarding geothermal potential in those area by using the gravity method. We did a 18 sites of gravity surveys in eastern flank of Mount Lawu where located in Magetan regency, Ngawi regency and Sragen regency, East Java. The principle of this method is to measure the earth's gravity field, then the value of gravity is corrected by some gravity corrections, i.e. height, tide, drift, normal gravity, free-air, Bouguer and terrain corrections. The Complete Bouguer Anomaly (CBA) shows the formation that related to the rock formation in the subsurface of Mount Lawu. Based on CBA modelling we found that in the eastern flank of Mount Lawu contains of tuff and breccia of volcanic rocks, breccia Jabolarangan and tuff Jabolarangan, lava andesite, igneous rock (pumice), and sedimentary rocks in the form of sandstone and clay. We found a fault structure on six tracks of a research area. Otherwise, we estimated that there is a geothermal potential on the southeast side of the research area

Keywords

Mount Lawu; Gravity Method; Fault; Geothermal Potential

Full Text:

PDF

References

Amalisana, B., Pin, T., & Saraswati, R. 2017. Penentuan potensi panas bumi menggunakan Landsat 8 dan hubungannya dengan kondisi geologi Gunung Lawu. 8 th Industrial Research Workshop and National Seminar, Politeknik Negeri Bandung.

Musset, A. E., & Khan, M. A. 2000. Looking Into The earth. New York: Cambridge University Press.

Reswara, A., & Sehah. 2014. Pendugaan lapisan reservoir panas bumi di kawasan gunungapi Slamet dengan memanfaatkan data anomali medan gravitasi citra satelit. Jurnal Berkala Fisika, 17, 45-54.

Telford, W. M., Geldart, L. P., & Sheriff, R. E. 1990. Applied geophysics second edition. New York: Press Syndicate of University of Cambridge.

Blakely, R. J. 1996. Potential theory in gravity and magnetic applications. New York: Cambridge University Press.

Lowrie, W. 2007. Fundamentals of geophysics. New York: Cambridge University Press.

Alzwar, M. 1998. Pengantar ilmu gunungapi. Bandung: Penerbit Nova.

Dampney, C. N. G. 1969. The equivalent source technique. Journal Geophysics, Vol. 34, 1.

DOI: https://doi.org/10.13057/ijap.v10i01.34217

Refbacks

  • There are currently no refbacks.