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Journal : Jurnal Ilmu Dasar

One Dimension Model Based Filter for Separation of Time-lapse Microgravity Anomaly Suhayat Minardi; Teguh Ardianto
Jurnal ILMU DASAR Vol 16 No 1 (2015)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jid.v16i1.1055

Abstract

The research has a goal to develop a model-based filter to separate the time lapse microgravity anomali caused by the 3 pieces of the source of anomalies with different depths. The activities which included in this research are: geological modeling, calculation of time lapse microgravity responses caused by several sources, designing of digital model based filter, application of the filter to separate synthetic time lapse microgravity anomali data, and performance test of the filter. Designed model is multi aquifer sistem with homogeny isotropic properties at different depth. Equipment of this research is a unit computer with MATLAB Version 7.11.0.584 (R2010b) and Microsoft Excel 2007 software. The designed filter can separate time lapse microgravity anomali based on its sources successfully with error less than 5%.Keywords: Filter, synthetic, time lapse microgravity anomaly 
Analysis of Groundwater Decline and Land Subsidence by using of Microgravity and Vertical Gravity Gradient Over Time Method Suhayat Minardi; Hiden Hiden; Daharta Dahrin; Mahmud Yusuf
Jurnal ILMU DASAR Vol 15 No 1 (2014)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1791.845 KB) | DOI: 10.19184/jid.v15i1.643

Abstract

Studies have been conducted to identify the occurrence of subsidence, a decline of groundwater, and to model the causes of subsidence in areas of Jakarta based on response of microgravity anomaly and vertical gravity gradient over time. Based on the processing and interpretation of gravity data advance of the time concluded that by using a combination of time lapse microgravity and its vertical gradient have been able to localize the source of the gravity anomaly and the results are strongly support the results of filtering to separate the source of the anomaly. The subsidence that occurs predominantly due to resettlement (in West and North Jakarta), caused by the extraction of groundwater and resettlement (in Central and East Jakarta), and dominated due to the extraction of groundwater (in South Jakarta).Keywords : Groundwater, time lapse micogravity, time lapse vertical gradient, resettlement, subsidence