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Samboja – Sepaku road is a land transportation route that can be used from the cities of Balikpapan and Samarinda to the new capital city. There is a problem with this road. Namely cracks appear on several roads due to subsidence. This is because the layer of soil that supports this road is thick and has young sediment. The hilly topography and steep ravines that dominate this road area also contributed to the subsidence. Efforts that can be made to deal with the occurrence of land subsidence are geotechnical engineering, such as making siring. In the construction process, the siring foundation must be planted in a dense layer of soil that is not easily shifted or unstable, which is also known as a hard layer. Determining the position of the hard layer can be done by identifying the subsurface stratigraphy using the resistivity method. The results of the subsurface lithology depiction obtained two types of soil layers that dominate the roadside area, namely clay layers with resistivity values of 2.31 Ωm – 15.1 Ωm and sandy clays with resistivity values of 38.7 – 253 Ωm. The clay layer is the recommended layer as a hard layer at a depth of 15-20 meters.

− Eksploitasi air tanah yang berlebihan merupakan salah satu faktor pendorong terjadinya pencemaran air laut atau intrusi air laut. intrusi air laut merupakan salah satu pencemaran air tanah yang memiliki banyak dampak negatif. Intrusi air laut dapat menyebabkan krisis air bersih, mengubah kesuburan tanah dan dapat merusak pondasi bangunan. Penelitian ini bertujuan untuk mengetahui indikasi intrusi air laut di Kecamatan Manggar Kota Balikpapan dengan menggunakan metode geolistrik resistivitas. Metode geolistrik memanfaatkan sifat kelistrikan suatu material, yaitu resistivitas untuk menentukan kondisi bawah permukaan. Parameter resistivitas dapat digunakan untuk mengidentifikasi indikasi intrusi air laut. Nilai resistivitas lapisan tanah atau airtanah yang telah tercemar oleh air laut akan semakin berkurang. Hal ini terjadi karena kandungan elektrolit yang memudahkan arus listrik mengalir. Hasil penelitian menunjukkan adanya indikasi intrusi air laut yang ditandai dengan anomali resistivitas rendah sebesar 1 – 8 m. Intrusi air laut di daerah Manggar ditemukan pada jarak ± 200 m dari pantai. Lapisan tanah yang tercemar airtanah diduga merupakan lapisan lempung. KATA KUNCI: Anomali; Air tanah; Resistivitas; Intrusi Air Laut ABSTRACT − Excessive groundwater exploitation is one of the driving factors for sea water pollution or seawater intrusion. seawater intrusion is one of the groundwater contaminations that has many negative impacts. Seawater intrusion can cause a clean water crisis, change soil fertility and can damage building foundations. This study aims to determine the indication of seawater intrusion in the Manggar sub-district of Balikpapan City using the resistivity geoelectric method. The geoelectric method makes use of the electrical properties of a material, namely resistivity to determine subsurface conditions. The resistivity parameter can be used to identify indications of sea water intrusion. The resistivity value of soil layers or groundwater that has been contaminated by sea water will decrease. This happens because of the electrolyte content which makes it easier for electric current to flow. The results showed an indication of seawater intrusion marked by a low resistivity anomaly of 1 - 8 Ωm. Sea water intrusion in the Manggar area was found at a distance of ± 200 m from the coast. Soil layer that is contaminated with groundwater is thought to be a layer of clay. KEYWORD S: Anomaly; Groundwater; Resistivity; Seawater intrusion

Identified subsurface composition remains one of the important things in development, such as finds out potential that is below the surface, this research in Institut Teknologi Kalimantan Campus (ITK). This study aims to identify distribute potential values and finds out the source of anomalies in the ITK Campus area. This study uses the Self-Potential method with a fixed-base technique. The data obtained in the form of potential difference (delta V) data, base potential data and measurement point coordinates. The data was corrected by daily base variation, daily correction and reference correction. After obtaining a potential value from the correction at each measurement point, the data processing was done using surfer 11 software. The results of data processing were obtained isopotential contour map and qualitative interpretation which could be seen distribution of potential different values. On the isopotential contour map, slicing of two cross sections selected indicates the source of anomaly. Anomalous potential values of 45 mV to -5 5 mV indicated anomalous sources namely electrolyte potential in groundwater with positive anomaly values negative up to hundreds of mV. A nd, there was a potential for a liquid flowwith a positive and negative anomaly ≤ 100 mV

Ikan bandeng merupakan jenis ikan yang sangat digemari oleh masyarakat karena mempunyai kandungan gizi yang baik yakni kandungan protein tinggi. Ikan bandeng di Kampung Salok Lay sangat melimpah namun belum dilakukan pengolahan yang maksimal untuk meningkatkan nilai jualnya. Selain itu, kelompok tambak di Kampung Salok Lay kesulitan dalam menjual hasil panennya karena ukuran ikan yang di minta oleh pembeli dalam jumlah yang banyak tidak sama rata. Hal ini, disebabkan juga oleh minimnya bibit dengan kualitas bagus dan harga pakan yang tinggi. Ikan Bandeng hasil panen lebih banyak di jual ke pasar tradisional dengan harga relative murah sehingga sering kali mengakibatkan kerugian kepada para kelompok tambak ikan. Perlu dilakukan alternative pengolahan ikan bandeng, yaitu menjadi ikan bandeng presto. Dan membuat desain kemasan produk ikan bandeng agar mempunyai nilai jual yang cukup tinggi. Metode yang diterapkan pada kegiatan pengabdian kepada masyarakat (PkM) ini adalah memberikan sosialisasi dan pelatihan cara pengolahan ikan bandeng presto. Dari kegiatan ini masyarakat Salok Lay RT 09 sangat antusias mengikuti kegiatan ini terbukti dengan tingkat kehadiran masyarakat sejumlah 10 orang, yang merupakan pemilik tambak ikan bandeng. Kata kunci : ikan bandeng; tambak; presto ABSTRACTMilkfish is a type of fish that is very popular with the community because it has good nutritional content, namely high protein content. Milkfish in Kampung Salok Lay is abundant but has not been processed optimally to increase its selling value. In addition, the pond group in Kampung Salok Lay has difficulty selling their harvests because the size of fish demanded by buyers in large quantities is not the same. This is also due to the lack of good quality seeds and high feed prices. As a result, most harvested milkfish are sold to traditional markets at relatively low prices, which often results in losses for fish pond groups. Therefore, it is necessary to do alternative processing of milkfish to become presto milkfish. And make a packaging design for milkfish products, so they have a reasonably high selling value. The method applied to this community service activity (PkM) is to provide socialization and training on processing presto milkfish. The people of Salok Lay RT 09 were enthusiastic about participating in this activity, as evidenced by the presence of 10 who are owners of milkfish ponds. Keywords: milkfish; pond; presto

Pada wilayah RT. 59 kelurahan Batu Ampar Balikpapan terdapat perkebunan pisang yang cukup luas milik warga setempat. Pada saat panen, pohon pisang biasanya ditebang dan dibuang begitu saja. Proses ini menghasilkan limbah batang pisang, jika batang tersebut tidak dimanfaatkan. Batang pisang dapat diolah menjadi produk yang lebih bernilai seperti bahan makanan. Salah satu contoh bentuk pemanfaatan batang pisang sebagai bahan makanan adalah pemanfaatan batang pisang menjadi kripik. Kegiatan pengabdian kepada masyarakat (PkM) ini bertujuan memberikan pengetahuan kepada warga RT.59 Kelurahan Batu Ampar terkait pemanfaatan limbah batang pisang menjadi kripik melalui kegiatan pelatihan. Rangkaian kegiatan PkM yang dilakukan adalah Survei dan persiapan, kegiatan sosialisasi, pelatihan pembuatan kripik batang pisang dan pengisian kuesioner. Peserta kegiatan ini adalah warga RT.59 Kelurahan Batu Ampar. Berdasarkan hasil kuesioner, peserta menilai pelaksanaan pelatihan pembuatan kripik batang pisang mudah dipahami, langkah dalam proses pembuatan kripik batang pisang mudah diterapkan dan kripik batang pisang hasil pelatihan menarik dan enak untuk dikonsumsi. Kegiatan PkM ini mampu meningkatkkan wawasan masyarakat RT.59 Kelurahan Batu Ampar Balikpapan, dalam memanfaatkan limbah batang pisang menjadi produk yang lebih bernilai seperti kripik. Kata kunci: pelatihan; pemanfaatan; kripik; limbah; batang pisang. ABSTRACTIn the RT area. In 59 villages in Batu Ampar Balikpapan, there are banana plantations that are quite large owned by local residents. At harvest time, banana trees are usually cut down and thrown away. This process produces banana stem waste, if the stem is not utilized. Banana stems can be processed into more valuable products such as foodstuffs. One example of the use of banana stems as food is the use of banana stems into chips. This community service activity (PkM) aims to provide knowledge to residents of RT.59 Batu Ampar Village regarding the utilization of banana stem waste into chips through training activities. The series of PkM activities carried out were surveys and preparations, socialization activities, training on making banana stem chips and filling out questionnaires. The participants of this activity are residents of RT.59 Batu Ampar Village. Based on the results of the questionnaire, participants assessed that the training on making banana stem chips was easy to understand, the steps in the process of making banana stem chips were easy to apply and the training results were interesting and delicious to eat. This PkM activity was able to increase the insight of the people of RT.59 Batu Ampar Village, Balikpapan, in utilizing banana stem waste into more valuable products such as chips. Keywords: training; utilization; chips; waste; banana stems.

Information of subsurface stratigraphy is needed during the process of preparing multi-story buildings to avoid problems in determining the level of multi-story building piles. This research was conducted using the geoelectric method to study the subsurface stratigraphic conditions in the area. Based on the measurement results, we find an overview of the subsurface stratigraphic conditions consisting of soil in the first layer with resistivity values ​​ranging from 305 to 570 Ωm, the soil in the study area is red-yellow, namely podsolic soil mixed with sand and gravel. The second layer is clay layer by water saturated with resistivity values ​​between 15 to 44 Ωm, and the third layer with resistivity values ​​varying from 112 to 341 detected from the surface is sandy clay. Insertion of coal at the first measurement point was detected buried at a depth of 17 m from the surface with a resistivity value of 962 Ωm.

In building construction planning, roads, or other infrastructures, Soil capacity for placing foundation is an substantial part that must be considered. When the land as construction supporting experiences fracture or shift, then it can generate building failure. The potential for fracturing and soil displacement can be identified from the thickness of weathered layer. Geoelectric resistivity methods of dipole-dipole array were applied in this study to determine the thickness of the weathered layer. The study was conducted at three different measurement locations oriented to east-west. The result of data processing usingRes2dinv software with an inversion technique is 2D resistivity section that represents a conceptual subsurface geological model. From these results, three types of rock layers are identified. The first layer is a weathered layer in the form of topsoil, clay, and sand with resistivity value of 8-276 Ωm and the thickness varied from 5 m to 17 m, the second layer is clay sand with resistivity value of 276-2000Ωm identified in about12m to infinite depth, and the resistivity values up to 2000 Ωm the third layer identified at location SS_01 is considered to be coal. Keywords: resistivity, geoelectric, dipole-dipole, weathered layer ABSTRAK Dalam hal perencanaan pembangunan gedung, jalan, maupun infrastruktur lainnya, kestabilan tanah menjadi salah satu bagian penting yang harus diperhatikan. Jika tanah sebagai pendukung bangunan mengalami deformasi berupa rekahan, penurunan atau pergeseran, maka hal tersebut dapat memicu kerusakan konstruksi bangunan. Potensi rekahan,penurunan dan pergeseran tanah dapat diketahui dari ketebalan lapisan lapuk. Metode Geolistrik resistivitas konfigurasi dipol-dipol diaplikasikan dalam penelitian ini untuk menentukan ketebalan lapisan lapuk. Penelitian dilakukan di tiga lokasi pengukuran berbeda dan beroentasi timur-barat. Hasil pengolahan data menggunakan software Res2dinv dengan teknik inversi berupa penampang resistivitas 2D yang merepresentasikan model geologi konseptual bawah permukaan. Dari Hasil tersebut teridentifikasi tiga jenis lapisan batuan. Lapisan pertama merupakan lapisan lapuk yang terdiri dari top soil ,lempung dan pasir halusmemiliki nilai resistivitas 8-276 Ωm dan ketebalan yang bervariasi dari 5 m hingga 17 m. Lapisan kedua adalah pasir lempung memiliki nilai resistivitas 276-2000 Ωm danteridentifikasi pada kedalaman 12 m sampai tak hingga, dan lapisan ketiga dengan nilai resistivitas lebih dari 2000 Ωm yangteridentifikasi pada lokasi pengukuran SS_01 diduga sebagai batu bara. Kata Kunci: resistivitas, geolistrik, dipole-dipole, lapisan lapuk

Kondisi bawah permukaan bumi yang kompleks sangat menarik untuk dipelajari. Informasi kondisi bawah permukaan dapat digunakan dalam berbagai bidang keilmuan. Informasi kondisi bawah permukaan memberikan gambaran karakteristik dari setiap lapisan batuan. Dalam penelitian ini menggunakan metode geolistrik untuk mengetahui kondisi bawah permukaan. Metode geolistrik menggunakan sifat kelistrikan yaitu resistivitas batuan. Akuisisi data lapangan dilakukan dengan cara mengalirkan arus listrik ke bawah permukaan dan mengukur beda potensia yang muncul. Konfigurasi elekroda yang digunakan adalah konfigurasi wenner yang menghasilkan penampang 2D resistivitas bawah permukaan. Berdasarkan penampang 2D resistivitas bawah permukaan diketahui lapisan bawah permukaan daerah penelitian didominasi oleh lapisan lempung yang tersisipi pasir dengan nilai resistivitas 10 – 31 Ωm tersebar disemua lintasan pengukuran. Terdapat juga lapisan lempung yang tersaturasi oleh air dengan resistivitas 1 – 10 Ωm yang hanya terdapat dilintasan pertama pada kedalaman 5 – 18 m dibawah permukaan. Sesuai dengan kondisi geologi di dareah penelitian juga terdapat sisipan batubara, hal ini terlihat pada lintasan pertama dan kedua dengan nilai resistivitas > 90 Ωm. Data informasi bawah permukaan hasil penelitian dapat digunakan sebagai data pendukung dalam persiapan pembangunan dan meminimalisisr dampak bencana alam.

Pengukuran resistivitas secara sounding telah dilakukan di daerah Candi Dasa (CD), Provinsi Bali. Tujuan penelitian ini adalah mengidentifikasi sumber air tanah baru. Untuk menentukan posisi aquifer air tanah bawah permukaan maka dilakukan pengambilan data sounding di dua titik yaitu CD 1 dan CD 2. Metode yang digunakan adalah metode geolistrik resistivitas Konfigurasi Schlumberger dengan panjang lintasan CD 1 dan CD 2 adalah 150 m dengan spasi 1 m. Pemrosesan data dengan menggunakan software IP2Win dan Progress 3 untuk memungkinkan penggambaran distribusi resistivitas batuan dalam 1 D. Hasil interpretasi menunjukkan bahwa struktur batuan bawah permukaan terdiri dari batuan soil, tuff, lava dan sandy tufa. Hasil interpretasi menunjukkan bahwa lapisan batuan yang terdapat terbentuk karena aktifitas vulkanik yang berasal dari aktifitas Gunung Agung yang berada di Kabupaten Karang Asem. Batuan seperti lava dan tuff adalah batuan yang memiliki porositas yang kecil karena memiliki ukuran butiran yang halus dan kecil, memiliki permeabilitas yang rendah sehingga menyebabkan susah untuk menyimpan dan dan mengalirkan air. Lapisan batuan ini diperkirakan berfungsi sebagai lapisan impermeable dan selanjutnya berfungsi untuk menahan air yang mengalir secara horizontal. Selanjutnya, lapisan batuan sandy tufan yang memiliki porositas dan permeabilitas yang besar karena memiliki butiran batuan yang besar bertugas untuk menyimpan dan mengalirkan air.

Bromo volcano is one of a series of active volcanoes in Indonesia, located on the Tengger caldera, Probolinggo, East Java. Bromo volcano has increased volcanic activity in the end 2015 until early 2016. The research was conducted to determine the characteristics of volcanic tremors. The methods used to determine the characteristics of volcanic tremors are spectral analysis and cross-correlation waveform analysis. Spectrogram analysis obtained frequency value 1-8 Hz for volcanic tremor of Bromo Volcano. From the results of spectral analysis volcanic tremor, it’s can be seen the value of the frequency peaks irregular means the type of spasmodic tremor. Based on the pattern of the peaks of the tremor spectral analysis using 3 stations having the same pattern and the analysis of cross-correlation waveform volcanic tremor of Bromo volcano was indicated from the same source mechanism because the correlation coefficient value is good that ranged about 0.6 – 0.8.

Penelitian ini berjudul Identifikasi Karakteristik Reservoar Berdasarkan Data Akuistik Impedan Dan Log Neutron Porositas Studi Kasus: Lapangan Boonsville, USA. Penelitian ini dilatarbelakangi oleh perlunya menemukan lokasi prospek hidrokarbon dalam upaya menjaga ketahanan energi. Tujuan dari penelitian ini antara lain untuk mendapatkan nilai cutoff AI clean sand stone pada formasi Caddo dan Vineyard berdasarkan hasil crossplot log AI, density, dan gamma ray dan untuk menentukan lokasi/zona yang di prediksi mengandung hidrokarbon pada formasi Caddo dan Vineyard berdasarkan hasil analisis inversi AI, porositas, dan analisis kualitatif data log. Metode yang digunakan dalam penelitian ini adalah metode seismik inversi impedansi akustik (AI). Metode seismik inversi AI digunakan untuk mendapatkan parameter fisis batuan yaitu impedansi akustik sehingga persebaran zona reservoar tempat tersimpannya cadangan hidrokarbon dapat diprediksi. Hasil sebaran AI pada volume seismik dapat digunakan untuk memprediksi sebaran porositas. Prediksi sebaran porositas pada volume seismik didapat dari hasil regresi linier antara nilai AI dengan data log porositas pada sumur B Yates 18 D. Hasil penelitian didapatkan nilai cutoff AI clean sand stone pada formasi Caddo sebesar 38000 - 55500 (ft/s) (gr/cc) dan pada formasi Vineyard sebesar 33000 - 37500 (ft/s) (gr/cc). Pada Top Caddo memiliki 4 zona yang diprediksi mengandung gas dengan reservoar berupa clean sand stone. Pada Top Vineyard ditemukan 3 zona yang diprediksi juga mengandung gas dengan reservoar berupa shaly sand.

This research was conducted to identify subsurface stratigraphy at Institut Teknologi Kalimantan (ITK) area. The information of subsurface stratigraphy becomes more important for minimizing the effects of changes in soil structure. We run the Geoelectrical resistivity method using Wenner-array along four measurement lines. Field data measured consists of electrical current and potential difference to calculated apparent resistivity values. Then, the apparent resistivity data were inverted to obtained true resistivity values. The results showed that subsurface stratigraphy was composed of three main layers. The first layer was characterized by higher resistivity values ranging from 39 to more than 86 ohm-meters interpreted as topsoil. The lower range of resistivity values at the second layer was identified as clay with resistivity values from 9.36 to 39 ohm-meters, while the higher resistivity values ranging from 39 to 86 ohm-meters and marked by Brown to red colour below the surface at the third layer was identified as clay sandstone.

TPA Manggar is a landfill in Balikpapan City. During the rainy season, the leachate discharge entering the processing plant is so large that the collection tub will not be able to withstand the leachate flow rate. To find out the direction of the distribution of leachate waste and the extent to which it has spread and to map the areas at high risk of being contaminated, measurements were taken using the Geophysical method, namely the Self Potential Method (SP). The SP method is based on measuring the self-potential of rocks in the earth’s crust without having to inject an electric current into the soil. Based on this, research will be carried out to determine the mapping of the distribution of leachate flow in the TPA Mangaar area. The results of measurement and processing of self-potential data can be showing beneath the surface in the form of leachate distribution in the study area based on isopotential contour. Based on the results of contour and isopotential map data processing. The highest potential value of this study was 60 mV, while the lowest potential value of this study was -40 mV.

The need for water resources continues to increase from year to year to meet various needs. The availability of water resources is increasingly limited due to seawater intrusion or water pollution. Pancuma Village is one of the coastal areas where it is necessary to study the potential of groundwater, especially during the dry season. One way to determine the presence of the groundwater aquifer layer is by using the resistivity method. This method is an effective geophysical method for shallow exploration so that it can be used to determine the structure beneath the earth’s surface. The configuration used in this study is the Schlumberger configuration. Research in Pancuma Village aims to determine the subsurface stratigraphy of the study area based on the resistivity value and to determine the distribution of groundwater aquifers in the study area. The results obtained from this study are that there are four types of subsurface layers in the study area, namely topsoil, claystone, iron sand, and alternating sandstone with conglomerates which are the aquifer layer in the study area. The resistivity value estimated at the aquifer layer ranges from 119 Ωm - 529 Ωm with a thickness of up to 45 meters.

West Nusa Tenggara (NTB) has a very diverse mineral content both metal and non-metal minerals. Sekotong Sub District in West Lombok Regency has mineral resources such as gold, copper, and silver. Artisanal and small scale gold mining activities are carried out without calculating how much potential mining materials are available and at what point and at what depth the minerals are located, the required cost, labor and time. Similarly, cases that occur in artisanal and small scale gold mining areas also occur in the Rambut Petung area, Sekotong Sub District. Therefore, special methods are required to determine the presence of excavated materials that settle beneath the surface of the earth. The method that is often used in identifying subsurface is the geophysical method. The utilization of geophysical methods must be under the nature of the materials to be examined. The data processing results indicate that there are layers consisting of breccias, lava, tuff with lens limestone. Based on the resistivity log, the resistivity value is 44.56 ohms, 3-11 m the resistivity value is 17.33 ohms, 11-89 the resistivity value is 42.39 ohms, and the value of 89-130 is 309.81 ohms.

Hydrogeological conditions can provide information on movement and groundwater conditions, which have a significant influence on mining activities, especially underground mining. Research using geo-electric has been applied in various fields. This study aims to analyze the distribution of aquifers in the Sekotong area and provide basic planning tools to regulate underground mining in NTB Province. This study uses a geo-electric survey to assess hydrogeological conditions in underground mining by using the specific vertical electric sounding (VES) of Schlumberger array method, with 3 points (BP 01, 02, and 03). The output from the geo-electric survey shows that the apparent resistivity curve is being checked using IP2Win software. The results of this study indicate the value of the resistive type is between 3 - 25 Ωm; it can be concluded that the aquifer layer is at a depth of 1.5 m to 60 m. However, from data analysis, it was shown that the study area was formed by half of the tuff layer and cracked breccias. Therefore, below 60 m depth, it is indicated that permeable layers formed by volcanic breccia and lava are present.