Analisis Continuous Wavelet Transform (CWT) Anomali Residual Medan Gravitasi Di Situs Geologi Karangsambung Kebumen Jawa Tengah

Wahyu Hidayat, Wrego Seno Giamboro

Abstract


Gravity method is a passive geophysical method that provides information on the distribution of rock density below the surface. The gravity method has a weakness at the level of ambiguity in determining the depth of the anomaly. This study aims to determine the depth of the anomaly using Continuous Wavelet Transform (CWT) analysis to overcome the value of ambiguity, so that the results obtained have a high degree of accuracy. The research method is data survey / acquisition and data analysis. This research was conducted in Karangsambung Kebumen, Central Java with the acquisition of gravitational data as many as 56 measurement points. The results of data acquisition then analyzed included reading to mGal, tool height correction, drift, tides, latitude, free air correction, Bouguer correction, and field correction. The results of this correction obtained Complete Bouguer Anomalies (ABL) values which were then reduced to flat fields and regional-residual anomaly filters. The next step is CWT analysis by making incisions on residual anomaly maps. The results showed that the source of the anomaly was between ± 39.2 - 122.9 meters.


Keywords


anomaly; continuous wavelet transform (CWT); gravity

Full Text:

PDF

References


Asikin, S. (1974). Evolusi Geologi Jawa Tengah dan Sekitarnya, Ditinjau dari Segi Teori Tektonik Dunia yang Baru. Bandung: Disertasi Doktor. Dept. Teknik Geologi ITB.

Blakely, R.J., 1995, Potential Theory in Gravity and Magnetic Applications, Cambridge University Press, USA.

Castagna J., 2005, Spectral Decomposition of Seismic Data with Continuous Wavelet Transform, University of Oklahoma, Norman, USA,

Dampney, C.N.G., 1969, The Equivalent Source Technique, Geophysics Vol.34, no.1, P. 39 – 35.

Grant, F. S and G. F., West. (1965). Interpretation theory in applied geophysics. New York: McGaw - Hill Inc.

Hamilton. (1979). Tectonics of the Indonesian region. Reston: U.S. Govt. Print. Off.,.

Hidayat, W. (2012). Regional Structure Modelling at Menggala and Its Surrounding Area. First Earth Science International Seminar UPN “Veteran” Yogyakarta (hal. 282 - 293). Yogyakarta: UPN “Veteran” Yogyakarta.

Lilie J., R. (1999). Whole Earth Geophysics: An Introductory textbook for geologists and geophysicists. London: Prentic e- Hall, Inc.

Parkinson, C.D., Miyaazaki, K., Akita, K., Barber, A.J., and Carswell, D.A., 1998. An Overview and Tectonic Synthesis of The Prae-Tersiary Very HighPresure Metamorphic and Associated Rocks of Java, Sulawesi and Kalimantan, Indonesia. TheIsland Arc, Volume7, Pages 184-200.

Prasetyadi, C., 2011. Evolusi Tektonik Paleogen Jawa Bagian Timur. Disertasi Jurusan Teknik Geologi ITB. Tidak dipublikasikan

Suparka, ME., 1988 Studi Petrologi dan Pola Kimia Kompleks Ofiolit Karangsambung Utara Luk Ulo, Jawa Tengah. Disertasi Jurusan Teknik Geologi ITB. Tidak dipublikasikan

Telford, L. P. Geldart, R. E. Sheriff, Robert E. Sheriff. (1990). AppliedPhysics. Cambridge University Press

Ya Xu, Tianyao Hao, Zhiwei Li, Qiuliang Duan and Lili Zhang. 2009, Regional gravity anomaly separation using wavelet transform and spectrum analysis. Journal of Geophysics and Engineering, Volume 6, Number 3.




DOI: https://doi.org/10.31315/jmel.v2i2.2368

Refbacks

  • There are currently no refbacks.




This Journal indexed to :

Crossref Content Registration

Crossref Content Registration

JMEL on GS

Creative Commons License
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Statistik Jurnal Statistik Jurnal