Articles
<![CDATA[A Short Note on : Basic Behavior of the Mount Gamalamas Eruption ]]>
<![CDATA[Lilik Hendrajaya]]>;
<![CDATA[Surono Surono]]>;
<![CDATA[Gunawan Handayani]]>
<![CDATA[ Jurnal Matematika & Sains Vol 1, No 2 (1996) ]]>
Publisher : <![CDATA[Institut Teknologi Bandung ]]>
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<![CDATA[Hypothesis that the tectonic force release through earthquake will trigger eruption of near by volcano when its magma pocket is full of magma, is put forward. It is mechanically reasonable due to the fact that both magma and the pocket are inside the earth crust which suffers compression stress resulted from the pushing force of oceanic crust in the subduction zone. Observation is conducted at Mount Gamalama in the island of Ternate west of the Halmahera Island, North Molluca. It is expected to have strong pushing force condition. The result shows that the triggering phenomenon is present. The other important results are the understanding of process to produce repeated volcanic eruptions and the knowledge of eruption mechanism.]]>
<![CDATA[Aplikasi Metode Geolistrik Untuk Alat Monitoring Rembesan Limbah (Penelitian Model Fisik di Laboratorium) ]]>
<![CDATA[Ngadimin Ngadimin]]>;
<![CDATA[Gunawan Handayani]]>
<![CDATA[ Jurnal Matematika & Sains Vol 6, No 1 (2001) ]]>
Publisher : <![CDATA[Institut Teknologi Bandung ]]>
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<![CDATA[Geoelectrical method utilizes resistivity variation by measuring potential difference due to electrical current which is injected into the ground. The method can be imployed to characterize geological structure of the subsurface, to locate water reservoir, to monitor groundwater pollution and to explore geothermal reservoir. In this study, a laboratory physical model was used along with the geoelectric method as a means to monitor the pollutant transport in the sand of the model. The geoelectric method employed Wenner-Schlumberger configuration with electrode spacing of 5 cm.The result showed that the pollutant transport can be detected from the electrical resistivity variation. The addition conductive pollutant into the sand of the model caused the resistivity of the sand decreased, because the applied pollutant was conductive. After monitoring using five times measurement with pollutant interval application of 600 ml, the restivity measurement showed that the pollutant spreaded progressively at every measurement.]]>
<![CDATA[PENCITRAAN RESISTIVITAS BIDANG LONGSOR DI PERBUKITAN BOOI DAN ERIE KOTA AMBON MENGGUNAKAN KONFIGURASI WENNER â SCHLUMBERGER ]]>
<![CDATA[Souisa, Matheus]]>;
<![CDATA[Hendrajaya, Lilik]]>;
<![CDATA[Handayani, Gunawan]]>
<![CDATA[ Jurnal Spektra Vol 16, No 2 (2015): Spektra: Jurnal Fisika dan Aplikasinya ]]>
Publisher : <![CDATA[Jurnal Spektra ]]>
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<![CDATA[AbstrakPulau Ambon dalam hal ini Kota Ambon adalah bagian dari kepulauan Maluku merupakan pulau-pulau busur vulkanis dan termasuk berada dalam wilayah kepulauan pulau-pulau kecil yang berhubungan dengan zona penunjaman sehingga mempunyai tingkat kerentanan tinggi terhadap berbagai bencana alam, seperti erosi dan tanah longsor pada kondisi kelerengan tertentu. Penelitian ini bertujuan untuk mengetahui citra resistivitas longsor bawah permukaan di daerah longsor dan menentukan posisi kritis bidang gelincirnya. Lokasi penelitian di perbukitan Kmp.Booi Kecamatan Sirimau dan Desa Erie Kecamatan Nusaniwe Kota Ambon. Penyelidikan menggunakan metode geolistrik resistivitas dengan konfigurasi Wenner-Schlumberger dan pengukuran terbagi atas delapan lintasan. Hasil penelitian memberikan karakterisasi daerah longsor tipe slide rotasi dan aliran debris. Lokasi longsor merupakan daerah tebing dengan kemiringan > 45% dan dipicu dengan curah hujan > 200 mm. Citra penampang resistivitas menunjukkan korelasi data geologi, data klimatologi dan nilai resistivitas sehingga diperoleh litologi yang didominasi oleh nilai resistivitas rendah dengan struktur lapisan berupa lapisan lempung campuran. Citra bawah permukaan menunjukkan bahwa resistivitas lapisan atasnya jauh lebih rendah dari resistivitas lapisan bawah maka sangat memungkinkan terjadi longsor susulan pada lokasi penelitian. AbstractAmbon Island in this case the city of Ambon is part of the Moluccas islands are volcanic arc and included in the territory of the archipelago of small islands are associated with subduction zones that have a high degree of vulnerability to natural disasters, such as erosion and landslides on condition certain slope. This study aims to determine the image of the subsurface resistivity landslides in landslide areas and determine the position of slip zone. Research sites in the hills Kmp.Booi District of Sirimau, and Erie Village District of Nusaniwe Ambon. Investigations using geo-electric resistivity with Wenner-Schlumberger configuration and measurement is divided into eight line. The results of the study provide characterization of the landslide area slide-type rotation and debris flow. Landslide site is an area of cliffs with slopes > 45% and triggered by rainfall > 200 mm. Resistivity cross-section image shows the correlation of geological data, climatological data and resistivity values thus obtained lithology dominated by low resistivity values with the structure of a layer of clay coating mix. The slip zone was measured trajectory obtained from the resistivity contrast between two adjacent rocks. Subsurface image shows that the resistivity of the layer above it is much lower than the resistivity of the layer below it is possible subsequent landslides.Keywords: resistivity imaging, landslides, Wenner-Schlumberger, rainfall]]>
<![CDATA[Study on Estimates of Travel Distance, Velocity and Potential Volume of Amahusu Sliding Plane using Energy Conservation Approach in Conjunction with Geoelectric Survey ]]>
<![CDATA[Matheus Souisa]]>;
<![CDATA[Lilik Hendrajaya]]>;
<![CDATA[Gunawan Handayani]]>
<![CDATA[ Journal of Mathematical and Fundamental Sciences Vol. 50 No. 2 (2018) ]]>
Publisher : <![CDATA[Institute for Research and Community Services (LPPM) ITB ]]>
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DOI: 10.5614/j.math.fund.sci.2018.50.2.5
<![CDATA[The investigation of landslides applying various methods has been receiving increased attention in recent years. This study was aimed at assessing the estimated distribution of landslide movement using an energy conservation formula in a lumped mass model to obtain velocity and travel distance estimations, in combination with an inverted resistivity model for estimating the Amahusu landslide volume. The research location was in the Amahusu hills of the Nusaniwe subdistrict, Ambon, Indonesia. A survey was carried out using GPS and a geoelectric resistivity method with the Wenner-Schlumberger configuration. The results of the study provide a characterization of this rotational type landslide. The estimated landslide volume was 70,954 m3 and the estimated potential landslide volumewas 50,603 m3. This mass moved 303 m away from the original location, with an estimated maximum velocity of up to 21.25 m/s. The displacement pattern of a landslide mass is primarily controlled by the geometry of the sliding plane. The geometry of the sliding plane causes different types of movement, based on which the possible occurrence of a future landslide can be predicted.]]>
<![CDATA[Analisis Bidang Longsor Menggunakan Pendekatan Terpadu Geolistrik, Geoteknik Dan Geokomputer di Negeri Lima Ambon ]]>
<![CDATA[Matheus Souisa]]>;
<![CDATA[Lilik Hendrajaya]]>;
<![CDATA[Gunawan Handayani]]>
<![CDATA[ INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 8, No 1 (2018): April ]]>
Publisher : <![CDATA[Department of Physics, Sebelas Maret University ]]>
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DOI: 10.13057/ijap.v8i1.15482
<![CDATA[Telah digunakan banyak metode untuk mengkaji permasalahan longsor dari sudut pandangan pendekatan satu-disiplin, interdisiplin maupun multidisiplin. Beberapa metode sedang dikembangkan untuk dipadukan dalam investigasi longsor selama dekade terakhir ini, fokus studi diarahkan menggunakan pendekatan investigasi multidisiplin seperti survei geolistrik, geoteknik dan geokomputasi untuk menentukan potensi longsor sehingga dapat meminimalisir bencana longsor. Hasil kajian memberikan bidang gelincir terletak pada kelompok resistivitas menengah dengan jenis pasir atau pasir lempungan yang menindih kelompok resistivitas tinggi yang berupa batulempung keras (bedrock). Berdasarkan nilai faktor keamanan lereng, bidang gelincir ini berada pada keadaan kurang stabil. Sedangkan penerapan geokomputasi menunjukkan lokasi kajian ditafsirkan berada dalam zona bahaya yang tinggi sehingga sangat berpotensi adanya longsor susulan. Dari hasil kajian terpadu, lokasi kajian masih dalam kondisi tidak aman dan bisa terjadi longsor susulan jika dipicu oleh faktor luar. Untuk meminimalisir longsor susulan dengan menurunkan muka air tanah adalah menggunakan model tol air dengan memanfaatkan sungai-sungai kecil/besar yang terdapat di bawah lereng/tebing untuk dapat dialirkan air pada musim hujan]]>
<![CDATA[RANCANG BAGUN ALAT GEOLISTRIK BERBASIS PULSE –WIDTH MODULATION (PWM) ]]>
<![CDATA[Akbar Muhammad]]>;
<![CDATA[Handayani Gunawan]]>
<![CDATA[ PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 5 (2016): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2016 ]]>
Publisher : <![CDATA[Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI ]]>
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DOI: 10.21009/0305020127
<![CDATA[Kebutuhan alat survai geofisika sangat tinggi, terutama alat geolistrik. Tinggi kebutuhan tersebut membuat alat geolistrik menjadi sangat mahal. Untuk memecahkan masalah tersebut, maka muncul ide pembuatan geolistrik. Alat geolistrik adalah suatu alat geofisika untuk mengetahui aliran arus listrik kedalam tanah. Alat geolistrik menginjeksikan arus listrik tegangan DC. Kemudian di dalam tanah akan meimbulkan bedapotensial, bedapotensial tersebut kemudian diukur memgunakan voltmeter. Pada pembuatan geolistrik dimana tengangan DC yang diperoleh dari power supplay. Power supplay yang digunakan berbasis PWM (pulse-width modulation). Prinsip dasar dari PWM adalah menaikan tegangan DC dengan teknik modulasi. Teknik PWN banyak digunakan sebagai penguat amplifier karena memberikan tegangan DC dan arus DC yang cukup besar. Pengunaan PWM tersebut kemudian diubah menjadi power supllay geolistrik karena alat geolistrik memerlukan tegangan DC yang cukup besar untuk memijeksi arus ke dalam tanah pada bentangan yang cukup panjang. Kata-kata kunci: Geolistrik, Power Supplay, PWM, Tegangan DC.]]>
<![CDATA[PREDIKSI VOLUME POTENSI LONGSORAN BERDASARKAN INVERSI RESISTIVITAS (Studi Kasus di Amahusu dan Erie Ambon) ]]>
<![CDATA[Matheus Souisa]]>;
<![CDATA[Lilik Hendrajaya]]>;
<![CDATA[Gunawan Handayani]]>
<![CDATA[ PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 5 (2016): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2016 ]]>
Publisher : <![CDATA[Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI ]]>
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DOI: 10.21009/0305020404
<![CDATA[Investigations of landslides conducted intensive from year to year due to the intensity of the landslides that continues to increase along with the rainy season. This study aims to determine volume prediction of landslides through inversion resistivity of the subsurface in the area of the landslide. Research sites in the hills Amahusu and Erie District of Nusaniwe Ambon. Survey data retrieval using geoelectric resistivity with the Wenner-Schlumberger configuration and measurement is divided into several lines. The results of the study provide characterization of the landslide area slide-type rotation. The slip area of landslides is characterized by low resistivity and with layers of rock structure in the form of a layer of clay mixed with weathered rock and water-saturated clay layer. Predictive value of landslide volume when occurence the volume landslide for the location Amahusu of 70,953.9 m3 and Erie location of 34,042.3 m3, while the predictive value of the potential volume of landslides for the location Amahusu of 50,603.3 m3 and Erie location of 3,399.4 m3. The potential failure of a slope with a steep slope can predict occur of landslides subsequent in the original location. Keywords: landslides, volume prediction, inversion resistivity, slope failure.]]>
<![CDATA[Spectral Analysis of Surface Waves (SASW) Measurement For Soil Characterization ]]>
<![CDATA[Gunawan Handayani]]>
<![CDATA[ Indonesian Journal of Physics Vol 17 No 2 (2006): Vol. 17 No. 2, April 2006 ]]>
Publisher : <![CDATA[Institut Teknologi Bandung ]]>
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<![CDATA[In geotechnical engineering and earthquake engineering, the information of seismic shear wave velocity profile of the subsurface is vital in assessing the strength of soil layers, estimating the ground shaking during earthquake and liquefaction potential of the soil layers. Conventional method in determining the shear wave velocity profile is conducting seismic down hole or cross hole which requires drilling some boreholes. Recent popular method is to carry out surface wave survey that does not require any boreholes. This paper reports the results of one of surface wave method i.e. the Spectral Analysis of Surface Wave (SASW) for soil characterization in Banda Aceh. The field procedure and data processing including the phase unwrapping process which is very important to obtain an accurate field dispersion curve are discussed. The results of the survey in terms of shear wave profile are used in predicting the ground shaking during earthquake.]]>
<![CDATA[Landslide Dynamics and Determination Critical Condition Using of Resistivity Method in Desa Negeri Lima Ambon ]]>
<![CDATA[Matheus Souisa]]>;
<![CDATA[Lilik Hendrajaya]]>;
<![CDATA[Gunawan Handayani]]>
<![CDATA[ Indonesian Journal of Physics Vol 26 No 1 (2015): Vol. 26 No. 1, July 2015 ]]>
Publisher : <![CDATA[Institut Teknologi Bandung ]]>
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DOI: 10.5614/itb.ijp.2015.26.1.1
<![CDATA[Ambon Island is a volcanic island arc and included in the territory of the archipelago of small islands are associated with subduction zones that have a high degree of vulnerability to natural disasters, such as erosion and landslides on a particular slope conditions. This study aims to determine the dynamics of avalanches below the surface in the area of the landslide and determine the position of the gelincirnya. The study area in the mountains of Ulak Hatu Negeri Lima Ambon. Research using geoelectric of resistivity with Wenner-Schlumberger configuration. Geoelectric interpretation results correlated with the drill data to obtain landslide field located at a depth of approximately 5 m - 30 m and lithology dominated by low resistivity values with the structure of a layer of clay mixed with layers of weathered rock and clay layer with water saturated. Both of these layers contact each other and form the slope of the ground, causing the potential for critical slip thereon and allows the subsequent landslides. Critical location landslide direction of the obliquity of the avalanche that is, toward the cliff and the geometry of the type of debris avalanches of rocks and debris flow. Estimation of landslides occur in addition to the local geological conditions, but strongly influenced by rainfall reached 335.0 mm, earthquakes and coupled with a slope of 119.0%.]]>
<![CDATA[Mathematical Model of Landslides with Curved Sliding Plane Using Fracture Criterion of Solid Soil-Rock System ]]>
<![CDATA[Ikah Ning Prasetiowati Permanasari]]>;
<![CDATA[Lilik Hendrajaya]]>;
<![CDATA[Gunawan Handayani]]>
<![CDATA[ Science and Technology Indonesia Vol. 7 No. 1 (2022): January ]]>
Publisher : <![CDATA[Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya ]]>
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DOI: 10.26554/sti.2022.7.1.1-8
<![CDATA[Alluvial cliff with high slope and step has been known to cause curving sliding plane. This phenomenon is adopted as a knowledge, but it has never been studied theoretically. In this paper, mathematics derivation phenomenon is proposed using special model of 11 fracture criterion ????-????. The quantity of ???? is A???? 2 with A is a friction coefficient of stress ???? 2 . The failure model was substituted to the corresponding Mohr circle resulting the expected curve. The curve was used to measure the observed field profile to obtain the friction coefficient A.]]>
