Pemodelan Sesar Pasca Gempa Dengan Inversi Data Gravitasi Time Lapse
DOI:
10.29303/jpft.v5i1.1109Published:
2019-06-25Issue:
Vol. 5 No. 1 (2019): Januari - JuniKeywords:
Modeling, Gravity, Inversion, Time-lapseArticles
Downloads
How to Cite
Downloads
Metrics
Abstract
Time lapse or 4D gravity is the development of gravity methods with the fourth dimension is time. This method is characterized by repetitive measurements over a period of time using a high-precision gravity measuring device (gravimeter) which is supported by high accuracy measurement of position. In the case of a fault that triggers an earthquake, layers that have a different density between layers will have the effect of changing the measured value of the gravitational field on the surface. The difference in the value of measured gravity before and after the occurrence of a fault as a result of an earthquake is what gives the value of time lapse gravity. The model of position displacement of the layers before and after the earthquake, provides a model of density between times whose gravitational anomalies can be calculated by forward response. The response of time-lapse forward model (synthetic data) is then optimized to obtain an inversion model. Inversion programming is made using the Mathlab program which is based on the semi-infinite horizontal slab equation. The model parameters that are optimized are horizontal position, depth, and amplitude factor of faulted layers. The program testing on 3 different synthetic data shows that the fastest optimization was obtained in the 7th iteration step. The smallest RMS error from the 3 models was 1.23. 10-5. This inversion program can be applied to time lapse gravity anomalies results of measurements in the field in active fault zones before and after the occurrence of an earthquakeReferences
Eiken, O., Zumberge, M., and Stenvold, T., (2004)ââ¬ÅGravimetric monitoring of gas production from the Troll fieldââ¬Â SEG Int'l Exposition and 74th Annual Meeting, Denver, Colorado
Gettings, P., Harris, R.N., Allis, R.G., and Chapman, D.S.,(2002) ââ¬ÅGravity Signals At The Geysers Geothermal Systemââ¬Â Proceedings, Twenty-Seventh Workshop on Geothermal Reservoir Engineering, Stanford University.
Dafis, K., Li, Y., and Batzle, M., 2008, ââ¬Â Time-lapse gravity monitoring: A systematic 4D approach with application to aquifer storage and recoveryââ¬Â GEOPHYSICS,VOL. 73, NO. 6 _NOV-DEC 2008_; P.WA61ââ¬âWA69, 13 FIGS. 10.1190/1.2987376
Zuhdi, M., Sismanto, Setiawan, A., Setyowiyoto, J., Susilo, A., Sarkowi, M. Radial Derivative and Radial Inversion for Interpreting 4D Gravity Anomaly Due to Fluids Injection Around Reservoir,TELKOMNIKA, Vol.16, No.6, December 2018, pp.2855~2863.
Kadir, W. G. A., 1999, ââ¬ÅSurvey Gravitasi 4D dan dinamika Sumber Bawah Permukaanââ¬Â: Proceeding Himpunan Ahli Geofisika Indonesia, 94-99.
Grandis. H.. Pengantar pemodelan Inversi Geofisika. Institute Teknologi Bandung, Himpunan Ahli Geofisika Indonesia, Bandung, p105-113,2009
Author Biographies
Muhammad Zuhdi, FKIP Universitas Mataram
Muhammad Taufik, Program Studi Fisika, Universitas Mataram
Sutrio Sutrio, Program Studi Fisika, Universitas Mataram
Syahral Ayub, Program Studi Fisika, Universitas Mataram
License
Authors who publish with Jurnal Pendidikan Fisika dan Teknologi (JPFT) agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License 4.0 International License (CC-BY-SA License). This license allows authors to use all articles, data sets, graphics, and appendices in data mining applications, search engines, web sites, blogs, and other platforms by providing an appropriate reference. The journal allows the author(s) to hold the copyright without restrictions and will retain publishing rights without restrictions.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in Jurnal Pendidikan Fisika dan Teknologi (JPFT).
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).