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All Journal Natural B SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan
Erlangga I. Fattah
Institut Teknologi Sumatera
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Microtremor Assessment to Investigate the Local Site Response and the Depth of Weathering Rock at Institut Teknologi Sumatera Campus Area Maria Rosalita Pujiastuti Sudibyo; Erlangga I. Fattah; Cahil Suhendi; Reza Rizki
Natural B, Journal of Health and Environmental Sciences Vol 5, No 2 (2019)
Publisher : Natural B, Journal of Health and Environmental Sciences

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Abstract

Local site effects related to the local geology can influence the damage of earthquake, by amplifying or deamplifying the horizontal movement of ground motion. To characterize the site effects in a local area, the natural frequency and the amplification factors can be estimated by performing Horizontal-to-Spectral Ratio on microtremor data. The amplification factors and natural frequency obtained then can be used to estimate the seismic vulnerability and the depth of the bedrock. This method is applied by recording the microtremor data in 1.5x1.5 km2 ITERA campus area, deploying 11 points of measurements. The recording of 45 to 60 minutes long for each point has been done to accommodate the lowest possible natural frequency we may obtain. The HVSR estimation shows that there are two predominant frequency, F0 and F1, ranging from 0.7 to 1.31 Hz and 3.88 to 8,71 Hz. These two dominant frequencies are associated with two layers of tuff, a soft weathered laying on a thicker and stiffer tuff rock layer. The amplification factors Ao are varied from 2.5 to 9 and is considered as the low bound of the real amplification factor. The depth of the soft weathered tuff is estimated ranging from 8 to 18 m. The seismic vulnerability estimated from this research is ranged from 7 to 65, implying that the area has mid-level of vulnerability.
Sosialisasi batas kedalaman lapisan air tanah bersih di dusun Jatisari, desa Katimulyo, Lampung Selatan Harnanti Y. Hutami; Erlangga I. Fattah; Alhada Farduwin; Rhahmi A. Pesma; Putu Pradnya Andika
SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Vol 8, No 2 (2024): June
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jpmb.v8i2.23006

Abstract

Abstrak Kegiatan ini dilatarbelakangi oleh kurang ketersediaan air tanah yang dirasakan oleh warga selama beberapa waktu saat musim kemarau sedang berlangsung. Selain itu, warga mengkhawatirkan kualitas air tanah yang mereka konsumsi sehari-hari. Kegiatan sosialisasi kualitas dan kuantitas air tanah utamanya bertujuan untuk memberikan pemahaman kepada warga Dusun Jatisari, Desa Jatimulyo, Lampung Selatan mengenai lokasi potensi ditemukannya akuifer air tanah dan kualitas air tanah tersebut dalam penggunaannya di kehidupan sehari-hari. Umumnya keberadaan air tanah dipengaruhi oleh jenis litologi dan kondisi geologi bawah permukaan, sedangkan kualitas air tanah dipengaruhi oleh jumlah dan jenis partikel mineral yang terkandung dalam air tersebut. Metode yang digunakan dalam mengidentifikasi kedalaman akuifer air tanah adalah metode geofisika yang memanfaatkan sensitivitas parameter fisika berupa tahanan jenis batuan (resistivitas) terhadap keberadaan air di area pengamatan. Kualitas air tanah dalam kegiatan ini diobservasi dengan menggunakan bantuan alat ukur TDS (Total Dissolved Solid) yang secara khusus memberikan informasi mengenai jumlah partikel mineral yang terkandung pada sampel air tanah dalam satuan part per million (ppm) atau miligram per liter (mg/liter). Indikator kelayakan air tanah untuk digunakan sebagai air minum dan aktivitas sehari-hari oleh warga dusun Jatisari dikategorikan memiliki kualitas menengah hingga baik berdasarkan rendahnya ukuran partikel mineral, yaitu pada kisaran. Kata kunci: air tanah; kualitas air; resistivitas; kandungan partikel mineral Abstract The present study was motivated by the lack of groundwater availability for the residents of Jatisari Village during the dry season and their concerns about the quality of the groundwater they consume daily. Its objective was to increase the resident's awareness of the location of groundwater aquifers and the quality of the groundwater they use. The lithology type and the subsurface geological conditions generally influence the presence of groundwater. In contrast, groundwater quality is affected by the amount and type of mineral particles. A geophysical method was used to determine the depth of groundwater aquifers by examining the rock-specific resistance (resistivity) to the presence of water in the observation area. The quality of groundwater was assessed using a TDS (Total Dissolved Solid) measuring instrument, which determines the amount of mineral particles present in groundwater samples in parts per million (ppm) or milligrams per liter (mg/liter). Based on the low content of mineral particle solids, the groundwater is suitable for drinking and daily activities by the residents of Jatisari hamlet. The study's results classified the groundwater quality as good quality up to 60 meters depth below. Keywords: aquifer; water quality; resistivity; solids mineral content
Co-Authors Cahil Suhendi Farduwin, Alhada Harnanti Y. Hutami Maria Rosalita Pujiastuti Sudibyo Putu Pradnya Andika Reza Rizki Rhahmi A. Pesma