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IDENTIFIKASI SESAR GRINDULU DENGAN MEMANFAATKAN METODE GRAVITASI Hikmatul Maulidah; Tjipto Prastowo; Arie Realita
Jurnal Inovasi Fisika Indonesia (IFI) Vol 11 No 2 (2022)
Publisher : Jurusan Fisika FMIPA Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ifi.v11n02.p20-27

Abstract

AbstrakSesar aktif merupakan salah satu sumber potensial pemicu gempa tektonik di wilayah selatan Jawa Timur,dimana Pacitan merupakan kabupaten dengan tatanan geologi yang didominasi oleh busur pengunungan selatan.Identifikasi kehadiran dan karakteristik Sesar Grindulu di Kabupaten Pacitan adalah penting sebagai bagian dari studimitigasi bencana seismik. Proses identifikasi kehadiran dan karakteristik sesar tersebut memanfaatkan metode gravitasiuntuk menentukan posisi geografis, orientasi dan tipe Sesar Grindulu. Data penelitian berupa distribusi anomali gravitasiyang diperoleh dari satelit TOPEX dengan beberapa koreksi untuk mendapatkan Complete Bouguer Anomaly (CBA).Teknik pemfilteran kontinuitas ke atas diterapkan untuk memisahkan anomali regional dan anomali lokal sehingga bisadigunakan untuk mengetahui orientasi sesar. Teknik Second Vertical Derivative (SVD) diterapkan untuk mengetahuilokasi dan tipe sesar. Analisis semua teknik yang diterapkan dalam penelitian ini memberikan kesimpulan bahwa posisiSesar Grindulu adalah 111,1o – 111,3o BT dan 8,1o – 8,2o LS dengan orientasi arah timur laut–barat daya (NE-SW).Area timur laut identik dengan wilayah utara Kabupaten Pacitan yang didominasi batuan dengan densitas rendah dandiduga memotong jalur utama Sesar Grindulu di perlintasan Sungai Grindulu. Area barat daya identik dengan wilayahselatan Kabupaten Pacitan yang didominasi oleh batuan dengan densitas relatif tinggi karena wilayah selatan Pacitandipengaruhi oleh aktivitas magmatik busur pengunungan selatan Pulau Jawa. Interpretasi hasil terapan teknik SVD pada5 slicing anomali lokal menunjukkan bahwa Sesar Grindulu merupakan sesar dengan kombinasi tipe turun dan geser.Temuan penelitian ini bermanfaat sebagai kajian potensi bencana dan upaya pengurangan risiko bencana di Pacitan. Kata Kunci: Pacitan, Sesar Grindulu, metode gravitasi, TOPEX, kontinuitas ke atas, koreksi CBA, SVD AbstractActive faults have prompted one of potential sources for tectonic earthquakes in the southern regions of East Java,where Pacitan is a region of interest with a geological setting being dominated by the Java southern mountain arc.Identification of the presence and characteristics of Grindulu Fault in Pacitan is vital for seismic hazard mitigation study.In this study, such identification involved the use of gravity method to determine geographical positions, orientation andfaulting type of the Grindulu. The data included gravity anomaly distribution obtained from TOPEX satellites with somelocal corrections towards Complete Bouguer Anomaly (CBA). A filtering technique called upward continuation was usedto separate regional anomaly from local one in order to determine fault orientation. A Second Vertical Derivative (SVD)technique was also used to determine the Grindulu locations and faulting type. Analysis of the applied techniques showedthat the Grindulu is located at 111.1o – 111.3o E and 8.1o – 8.2o S with its NE-SW direction. We found that the northeaststudy area is identical to the northern Pacitan dominated by rocks of low-density across the Grindulu at the Grindulu River.The southwest area is dominated by rocks of high-density as the southern region is much influenced by magmatic activityof the southern mountain arc. The results derived from the SVD technique applied to 5 slicings on the local anomalyshowed that the Grindulu is a combination of normal and strike-slip faults. The current results are useful for examinationof seismic threat potensial hence disaster risk reduction in Pacitan. Keywords: Pacitan, Grindulu Fault, gravity method, TOPEX, upward continuation, CBA, SVD
Implementasi Pembuatan Free Energy Water Pump untuk Mengatasi Ketersediaan Kebutuhan Air pada Lahan Pertanian Masyarakat Desa Manarwi Bangil Pasuruan Rohim Aminullah Firdaus; Munasir Munasir; Evi Suaebah; Arie Realita
Lumbung Inovasi: Jurnal Pengabdian kepada Masyarakat Vol. 7 No. 4 (2022): December
Publisher : Lembaga Penelitian dan Pemberdayaan Masyarakat (LITPAM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/linov.v7i4.975

Abstract

Bangil adalah salah satu kecamatan yang ada di Pasuruan sekaligus sebagai ibukota Kabupaten. Secara Geografis, letak Kecamatan Bangil merupakan daerah paling utara di Kabupaten Pasuruan. Pemanfaatan lahan pertanian di bangil tidak hanya digunakan untuk menanam padi, tetapi jenis tanaman dan jenis ikan air tawar bisa menjadi alternatif sebagai pemanfaatan lahan yang ada di wilayah Bangil. Menurut Badan Statistik pada tahun 2021 hasil produksi padi mengalami penurunan sebesar 0,43%. Penurunan produksi pertanian terutama di daerah bangil kelurahan Manarwi terjadi akibat kurangnya pemerataan ketersediaan air dan mengandalkan ketersediaan air di musim hujan saja. Untuk itu agar pemerataan air tercukupi dengan baik, perlu adanya alat alternatif sebagai penyalur ketersediaan kebutuhan air. Pompa air berbasis energi terbarukan bisa menjadi salah satu alternatif untuk mengatasi hal tersebut. Dengan konsep pompa air yang ramah lingkungan, mudah dibuat dan di aplikasikan, tidak membutuhkan bahan bakar atau peralatan elektronik menjadi alternatif baru dan memberikan keuntungan dalam menekan pengeluaran dan tergolong sebagai alat yang murah serta bisa digunakan dalam jangka waktu yang lama. Hal ini mendorong tim PKM untuk memberikan pengarahan dan pembuatan pompa air berbasis free energy kepada masyarakat di wilayah Manarwi. Komponene masyarakat diajak untuk terlibat dalam pembuatan dan pemanfaatan pompa air berbasis free energi ini, meliputi pemerintahan tingakat desa, dan masayarakat di wilayah manarwi. Tahapan pelatihan dan pembuatan Pompa free energy ini meliputi pengetahuan tentang free energy water pump, menjelaskan prinsip kerja free energy water pump, pembuatan free energy water pump, dan menjelaskan serta pengaplikasian free energy water pump dalam bidang pertanian. Keberhasilan pelatihan ini dievaluasi baik pelaksanaannya maupun hasilnya. Evaluasi tersebut dilakukan dengan menggunakan angket respon peserta pelatihan terhadap pelaksanaan kegiatan pelatihan. Hasil angket respon adalah sebagai berikut : terhadap perlunya kegiatan PKM ini sebesar 85%, wawasan system kerja water pump 85%, wawasan tentang prinsip gaya gravitasi pada sistem water pump 82,5%, kegiatan diskusi 80%, pembuatan alat 90%, dan perlunya perkembangan alat 92,5%. The Implementation of Making a Free Energy Water Pump to Improve the Availability of Water Needs on Agricultural Land for the Community of Manarwi Bangil Pasuruan Village Bangil is one of the sub-districts in Pasuruan, which is also the district capital. Geographically, the location of Bangil District is the northernmost area in Pasuruan Regency. The utilization of agricultural land in Bangil is not only used for planting rice, but types of plants and freshwater fish can be an alternative for land use in the Bangil area. According to the Statistics Agency, in 2021, rice production will decrease by 0.43%. The decline in agricultural production, especially in the Bangil area of ??the Manarwi sub-district, occurred due to the lack of equal distribution of water availability and reliance only on water availability in the rainy season.For this reason, so that water distribution is fulfilled correctly, it is necessary to have an alternative tool as a distributor of the availability of water needs. Renewable energy-based water pumps can be an alternative to overcome this. With the concept of a water pump that is environmentally friendly, easy to make and apply, and does not require fuel or electronic equipment, it is a new alternative. It provides the advantage of reducing expenses, is classified as a cheap tool, and can be used for a long time. This prompted the PKM team to give directions and manufacture water pumps based on free energy for the people in the Manarwi area. Community components are invited to be involved in the manufacture and use of this free energy-based water pump, including village-level government and the community in the Manarwi area. The stages of training and making this free energy pump include knowledge, explaining the working principles, making free energy water pumps, and explaining and applying free energy water pumps in agriculture. The success of this training is evaluated both in its implementation and results. The evaluation was carried out using a questionnaire from the training participants' responses to the performance of the training activities. The results of the response questionnaire are as follows: regarding the need for this PKM activity by, 85%, insight into the working system of the water pump 85%, insight into the principle of gravitational force in the water pump system 82.5%, discussion activities 80%, tool making 90%, and the need for tool development 92.5%.
PROFILE OF COMMUNITY UNDERSTANDING AND LITERACY ABOUT DISASTER RISK MITIGATION: THE RESPONSES OF JAVA SOUTH COAST COMMUNITY AGAINST MEGATHRUST EARTHQUAKE AND TSUNAMI PREDICTION Iqbal Ainur Rizki; Handoko Bintoro; Khoirun Nisa'; Prima Rahman; Arie Realita; Utama Alan Deta
GeoEco Vol 8, No 1 (2022): GeoEco January 2022
Publisher : Universitas Sebelas Maret (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/ge.v8i1.52902

Abstract

Widiyantoro et al., as Institut Teknologi Bandung (ITB) scientists, predict the worst possibility that in the south of Java Island, a megathrust earthquake with a maximum magnitude of up to 9.1 on the Richter scale and a tsunami of up to 20 meters. So understanding and literacy about mitigation of the megathrust earthquake and tsunami need to be improved so that the South Coast of Java Island (Pansela) community has prepared for these disasters. This study aims to analyze the understanding and literacy of the Pansela community of the earthquake and tsunami disaster against the predictions made by ITB scientists. This study uses a qualitative descriptive method with a total of 57 community respondents living in Pansela. The study results show that most communities believe in this prediction and have fewer mitigation efforts against this disaster. However, the respondents still did not know the specifics of the megathrust earthquake. They considered an earthquake in the south of Java Island related to the megathrust earthquake. Therefore, it is necessary to increase community understanding and literacy regarding mitigation efforts against megathrust earthquakes and tsunami.