Article Per Year (5 Year)
p-Index From 2021 - 2026
0
P-Index
This Author published in this journals
All Journal IJOG : Indonesian Journal on Geoscience Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Yayat Sudrajat
Research Center for Geotechnology, Indonesian Institute of Sciences (LIPI)
Chemistry Earth & Planetary Sciences Energy

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
Audio-Magnetotelluric Modeling of Cimandiri Fault Zone at Cibeber, Cianjur Lina Handayani; Maryati Maryati; Kamtono Kamtono; M. Ma’ruf Mukti; Yayat Sudrajat
Indonesian Journal on Geoscience Vol 4, No 1 (2017)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1342.727 KB) | DOI: 10.17014/ijog.4.1.39-47

Abstract

DOI: 10.17014/ijog.4.1.39-47The characteristic of Cimandiri Fault Zone has not been completely defined despite plenty of studies had already been accomplished. Therefore, an audio-magnetotelluric modeling was carried out. An audiomagnetotelluric survey was conducted at two parallel lines (N166oE) that intersected Cimandiri Fault Zone in Cibeber area, Cianjur. The distance between those two lines was 4.5 km and each line consisted of twenty-one stations with the distance between stations was 500 m. From the acquired forty-two apparent resistivity curves, inversion was executed to obtain two models. The models indicate layers with resistivity value of > 1000 ohm.m at about 500 m depth at both lines, which are associated to the basement layer. Columns of low resistivity zones in about the middle of each model represent fault zones as the weak zones of the area, and both models displayed them slightly dip southward as thrust faults.
Changes in the Configuration of the Fresh Water Lens due to ASRRG, Western Part of the Tiny Pari Island, Seribu Islands, Jakarta, Indonesia Edi Prasetyo Utomo; Ananta Purwoaminta; Yayat Sudrajat
Jurnal Geologi dan Sumberdaya Mineral Vol. 18 No. 1 (2017): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v18i1.100

Abstract

Pari Island (Pulau Pari) is a small coral island in the Seribu Islands group off the north coast of the Jakarta Capital Special Region. Government has planned to develop this island into a tourist attraction because of its beautiful environment. However, the government development plans have not included facilities to meet the demand for groundwater, which represents the principal resource to meet the demand for freshwater. Pari Island has limited resources of groundwater due to the small size of the area where recharge of groundwater from rainfall can take place. A problem will arise that with the increase of visitors to the island the demand for freshwater will increase, while  groundwater resources of the island are very limited and dominated by brackish and saline groundwater. The objective of this research was to explore the possibility to increase the resources of fresh groundwater of Pari Island to support the increasing demand of fresh water. The method employed in the research is the application of ASRRG technology by the injection of the largest possible volume of rainwater and monitor changes of electrical conductivity and geoelectrical resistivity. Installation of an ASRRG network proved effective in lowering the salinity of groundwater in small islands. By increasing pore volume from 30% to 60% salinity decreases by 77%, which is reflected by the effect that the fresh groundwater lens which before comprised brackish water became fresh water with a thickness of 2.5 meter. The gain in pore volume equaled the decrease in salinity.Key words: Artificial recharge, Island hydrology, Salt-water/fresh-water relations, Indonesia
Co-Authors Ananta Purwoaminta Edi Prasetyo Utomo Kamtono Kamtono Lina Handayani M. Ma’ruf Mukti Maryati Maryati