Papers by Pradanto Poerwono
Analisis Peak Ground Acceleration DI Wilayahrejang Lebong Dan Lubuk Linggau Menggunakanmetode Probabilistic Seismic Hazard Analysis
Jurnal Penelitian Sains, Dec 30, 2022
Pengembangan sebuah alat peraga praktikum bandul fisis dengan memanfaatkan WiFi mikrokontroler no... more Pengembangan sebuah alat peraga praktikum bandul fisis dengan memanfaatkan WiFi mikrokontroler nodeMCU esp8266 dan sensor infrared untuk mengukur periode bandul telah berhasil dirancang dan dibuat. Alat praktikum ini telah diuji coba dengan melakukan eksperimen. Sensor Infrared yang digunakan akan berfungsi untuk mendeteksi gerakan dan mengukur periode bandul fisis dalam satuan detik. Lalu, secara langsung dikirimkan oleh WiFi mikrokontroler nodeMCU esp8266 ke komputer dan terbaca dalam google spreadsheet. Data yang diperoleh dari hasil eksperimen dapat digunakan untuk mendapatkan nilai percepatan gravitasi bumi dengan metode perhitungan regresi linear. Eksperimen yang dilakukan menggunakan sudut 20° dengan jarak pusat massa ke poros ayunan bandul 0.1 m, 0.15 m, 0.2 m, 0.25 m, 0,3m, 0,35 m, 0.4 m, dan 0.45 m. Berdasarkan eksperimen, alat yang dikembangkan ini mampu mengirimkan data dengan jarak maksimal 70 m. Nilai percepatan gravitasi yang didapatkan sebesar (9,9034±0,0319) m/s 2 .
Analisis Atribut RMS Amplitude Dan Atribut Sweetness Untuk Menentukan Sebaran Reservoar Batu Pasir (Sandstone) Pada Lapangan “Rj” Cekungan Asrisumatera Bagian Tenggara
Perbandingan Nilai Resistivitas Tanah Antara Lahan Tanaman Berakar Tunggang Dan Serabut Dengan Menggunakan Metode Geolistrik Tahanan Jenis 2D (Studi Kasus Pada Lahan Karet Dan Kelapa Sawit DI Desa Sungai Rambutan, Kecamatan Inderalaya Utara Kabupaten Ogan Ilir)
Karakterisasi Reservoir Menggunakan Inversi Seismik Impedansi Akustik Dan Multi Atribut Seismik Probabilistic Neural Network (PNN) Pada Lapangan ‘X’ Sub-Cekungan Tamiang Cekungan Sumatra Utara
Analisis Tingkat Seismisitas Wilayah Jawa Barat Bagian Selatan Periode 1960-2017
Analisis Geser Langsung (Direct Shear) Dan Sifat Fisis Pada Tanah Timbunan DI Lokasi Muara Tiga Besar Utara Pt. Bukit Asam (Persero) Tanjung Enim
Identifikasi Posisi Kebocoran Pipa Dengan Metode Geolistrik Konfigurasi Schlumberger Dalam Permodelan Skala Laboratorium
Penerapan Metode HVSR (Horizontal to Vertical Spectra Ratio) Untuk Menentukan Indeks Kerentanan Seismik Berdasarkan Pengukuran Sinyal Mikrotremor DI Kecamatan Kepahiang
Identifikasi Pengaruh Kepadatan, Penyiraman Air, Dan Pemupukan NPK Terhadap Nilai Resistivitas Tanah Menggunakan Metode Geolistrik Tahanan Jenis 2D
The Research of 2D Resistivity method using the Wenner-Schlumberger configuration to determine th... more The Research of 2D Resistivity method using the Wenner-Schlumberger configuration to determine the effect of soil density, water spraying and NPK fertilization on soil resistivity value . The research container was made of wood with dimensions of 2 m x 1 m x 0.44 m divided into 4 parts and named as G1, P1, G2 and P2 with a medium of top soil (surface soil). In tub G1 the soil is inserted without compaction and then given watering. In the tub P1 is given the soil by compacting and then given watering. Whereas in the tub G2 the soil is inserted without compaction then NPK fertilizer is applied, and the tub P2 soil is added by compacting and applying NPK fertilizer. The results showed that in the initial conditions (without treatment) the soil resistivity values in the tub G1, P1, G2 and P2 respectively 205 - 655 Ωm; 105 - 655 Ωm; 205 - 605 Ωm; and 155 - 605 Ωm. After treatment in the form of watering and NPK fertilization, the soil resistivity values in the tub G1, P1, G2 and P2 decre...
MENENTUKAN EFEK TAPAK LOKAL MENGGUNAKAN INDEKS KERENTANAN SEISMIK ( ) DAN KECEPATAN RATA-RATA GELOMBANG GESER PADA KEDALAMAN SAMPAI DENGAN 30m ( ) DI KECAMATAN CIBEUREUM, KOTA TASIKMALAYA, JAWA BARAT
West Java is one of the areas in Indonesia that has high disaster vulnerability. This condition i... more West Java is one of the areas in Indonesia that has high disaster vulnerability. This condition is affected by the complex geological order resulting in damage during an earthquake disaster. One of them is the earthquake in Tasikmalaya with a strength of 7.2 M on September 2, 2009, severe damage is in Cibeureum District, although this area is not too close to the epicenter but the soft soil conditions resulted in the area there is much damage to the building therefore the knowledge of the condition of the soil condition locally becomes a very important part in estimating the hazard of the soil movement specifically, to know the dangers of earthquake, the local seismic vulnerability index is assessed using the Shear Strain (GSS) table to know soil dynamics and mean shear wave velocities at depths up to 30 m ( ) treated by Horizontal to Vertical Spectral Ratio (HVSR) and Muthichannel Surface Wave (MASW) Inverse Analyzes classified using SNI 1726 -2012 after getting the value it will b...
Estimasi Pola Bidang Sesar Dengan Menggunakan Inversi Tensor Momen Berdasarkan Mekanisme Sumber Gempabumi Pada Pulau Sumatera
Sumatra Island region is located in the western part of Indonesia which is an area that has a hig... more Sumatra Island region is located in the western part of Indonesia which is an area that has a high intensity of earthquake. It caused west of Sumatra Island located between the meeting of the Eurasian (continental plate) and lndo-Australian Plate (oceanic plate) to it produce a subduction pattern (subduction zone). Therefore, it is necesssary to conducted research on the pattern of fault plane the earthquake to determine the type of fault that occurs on Sumatra island by moment tensor inversion that implemented in ISOLA-GUI software. One of the latest earthquake happened in Aceh, Pidie Jaya on Desember 06•, 2016. Based on the moment tensor inversion is produce the pattern of fault plane in the Sumatra's subduction zone is oblique which is dominated by dip slip reverse and Sumatra's fault zone is strike-slip. While the moment tensor inversion in Aceh's earthquake, Pidie Jaya is-strike slip, due to active fault in Aceh. Pidie Jaya is a branch of the Northern in Sumatra`s F...
Journal of Physics: Conference Series, 2018
Strong negative Indian Ocean Dipole (IOD) event took place in the tropical Indian Ocean during 20... more Strong negative Indian Ocean Dipole (IOD) event took place in the tropical Indian Ocean during 2016. Based on the Dipole Mode Index (DMI), the event has shown two peaks: in July and September. It is shown that the second peak was stronger than the first peak. Evolution of the event has started in May, reached its first peak in July, weaken in August, but rebounded and came to its second peak in September. The event was terminated in November. Robust sea surface temperature (SST) dipole patterns were observed during both peaks. In July, the SST anomaly in the eastern (western) pole of the IOD reached +1C (-1.5C). Meanwhile, during the second peak of the event, the SST anomaly in the eastern (western) pole of the IOD rose (fall) to nearly +2.5C (-1C). As a consequence, strong convective activities were observed over the maritime continent causing heavy rainfall during the peak of the event. On the other hand, there was a significant reduce of the rainfall over the eastern Africa during the peak of the event.
International Journal of Applied Earth Observation and Geoinformation, 2020
Indonesia has the world's largest tropical peatland, mostly located in the southern province of S... more Indonesia has the world's largest tropical peatland, mostly located in the southern province of Sumatra, the south of Kalimantan, and Papua. The catastrophic fires between June and October 2015 induced by the El Niño event burnt most of these peatland areas. We analyzed spatio-temporal peat subsidence during pre-and post-fires in the peat hydrological unit of Sungai Sugihan-Sungai Saleh (KHGSS), South Sumatra using Sentinel-1 images by applying DInSAR-SBAS algorithm. Based on our analysis, the linear subsidence rate after the 2015 peat fires increased by a factor 6.4 compared to that of pre-fires. Generally, the estimated subsidence is temporally wellcorrelated with the precipitation variation. In addition, the subsidence patterns are spatially correlated with the hotspot distribution, peat thickness, and drainage networks. Furthermore, we mapped vegetation cover over the KHGSS by using the Sentinel-1 images as well. The results show that the vegetation degradation is correlated with the hotspot distribution and the highly-degraded vegetation associated with the 2015 peat fires. It demonstrated that the 2015 El Niño event has significant impacts on increasing the amount of the subsidence and the vegetation degradation in KHGSS area.
What did drive extreme drought event in Indonesia during boreal summer/fall 2014?
Journal of Physics: Conference Series, 2017
Pembuatan Dan Pengujian Kualitas Papan Partikel Berbahan Dasar Serbuk Gergajian Kayu Seru Dengan Uji Fisik, Mekanik Dan Thermal
One of the ways to utilize sawdust waste is by make it a particle board. To determine the quality... more One of the ways to utilize sawdust waste is by make it a particle board. To determine the quality of a particle board, we need to takes a test, the test that usually done are physical and mechanical testing, but in this study tests were conducted are physical testing, mechanical testing and thermal testing. Physical test that done are including density test and water absorption test, and for mechanical test that done are modulus of rufture test and internal bond test, while for thermal testing is to test the ability of the particle board heat damping. The value of particle board density is 0.32 gram the value of water absorption is 1.52%, the value of modulus of rufture is 13.83 kgf , while the value of internal bond is 0.01 kgf. For the thermal test, there is a damping heat comparison between the box that made of artificial particle board and the box that made of manufacturer particle board. The results of room temperature of boxes and wall boxes measurement shows that the artifici...
Spatio-temporal variations of sea surface temperature in the Banda Sea during the period of 2002-2008
AIP Conference Proceedings, 2017
Spatial and temporal variations of sea surface (SST) in the Banda Sea are studied for the period ... more Spatial and temporal variations of sea surface (SST) in the Banda Sea are studied for the period of June 2002 – May 2008. An empirical orthogonal function (EOF) analysis has been applied to an optimum interpolation SST (OISST) having spatial resolution of 0.25° and temporal resolution of 1 day. The results revealed that the four EOF modes account for 53.1% of the total SST variance. The first EOF mode, which accounts for 33.2% of the total variance, revealed the east-west SST pattern in the Banda Sea. This indicates 180° out of phase temporal variability between the eastern and the western parts of the Banda Sea. The second and the fourth modes explain 9.6% and 4.6% of the total variance respectively. Both two modes show the southeast-northwest spatial pattern. Meanwhile, the third mode accounting for 5.4% of the total variance indicates that the high SST variation is concentrated in the central Banda Sea. In addition, the corresponding principal component time series of the first mode revealed robust sea...
Terrestrial, Atmospheric and Oceanic Sciences, 2014
The role of equatorial oceanic waves on the evolution of the 2007 positive Indian Ocean Dipole (p... more The role of equatorial oceanic waves on the evolution of the 2007 positive Indian Ocean Dipole (pIOD) event was evaluated using available observations and output from a quasi-analytical linear wave model. It was found that the 2007 pIOD event was a weak and short-lived event: developed in the midsummer (July), matured in the early-fall (September), and terminated in the mid-fall (October). The evolution of the 2007 pIOD event was linked to the equatorial wave dynamics. The event development was associated with the generation of upwelling equatorial Kelvin waves (westward current anomalies) generated by easterly wind anomalies. The event termination was associated with the occurrence of eastward zonal current anomalies resulting from a complex interplay between the wind-forced down welling Kelvin waves and the eastern-boundary-reflected Rossby waves. Results from a quasi-analytical linear wave model show that during the event development and maturation, the wind-forced Kelvin waves played a dominant role in generating zonal current anomalies along the equatorial Indian Ocean, while the easternboundary-reflected Rossby waves tended to weaken the wind-forced Kelvin wave signals. During the event termination our model shows that the initiation of anomalous eastward current resulted from the reflected Rossby waves at the eastern boundary. The wind-forced Kelvin waves associated with the seasonal reversal of the monsoon further strengthened the eastward zonal currents generated by the boundary-generated Rossby waves in late-October/early-November. This highlights the importance of the eastern-boundary-reflected Rossby waves on the IOD event termination.
Jurnal Inovasi dan Pembelajaran Fisika
Penelitian ini merupakan penelitian pendahuluan yang bertujuan untuk mengidentifikasi pengetahuan... more Penelitian ini merupakan penelitian pendahuluan yang bertujuan untuk mengidentifikasi pengetahuan awal mahasiswa mengenai besaran vektor dan skalar pada konsep momentum dan energi. Bentuk penelitian adalah penelitian deskriptif menggunakan metode campuran. Populasinya adalah seluruh mahasiswa yang mengikuti Kompetisi Olimpiade Fisika tingkat Universitas Sriwijaya tahun 2021 pada bidang Fisika dengan jumlah sampel 30 orang mahasiswa. Teknik pengumpuan data yang digunakan adalah metode tes. Pada tes ini juga disertakan tingkat keyakinan mahasiswa dalam menjawab soal dan alasan memberikan jawaban. Hasil peneltian menunjukkan bahwa sebanyak 60% mahasiswa menjawab pertanyaan dengan salah. Hal ini menunjukkan ketidakpahaman mahasiswa terhadap konsep, terutama pada operasi perkalian antara besaran vektor dan besaran skalar ataupun sesama besaran vektor. Kurangnya rasa kepercayaan diri akan kemampuan yang dimiliki oleh mahasiswa, juga menyebabkan kesalahan.
Interannual variation of the Indonesian throughflow in the Timor Passage as revealed in SODA: 1958 – 2008
Temporal variability of the Indonesian Throughflow (ITF) in the Timor Passage was evaluated with ... more Temporal variability of the Indonesian Throughflow (ITF) in the Timor Passage was evaluated with special focus on its interannual variation. The ITF transport was estimated as a latitudinal averaged of an along strait currents in the Timor Passage based on the output of Simple Ocean Data Assimilation (SODA) experiment from 1958 – 2008. A Complex Empirical Orthogonal Function (CEOF), then, was applied to the interannual estimated ITF transport to extract the dominant mode of variability. The result has shown that the leading CEOF mode was explaining 67.2% of the total interannual variation. The reconstructed first CEOF time series shows strong positive anomalies (towards the Pacific Ocean) during 1962 – 1969, 1972 – 1978, 1997 – 1999, 2002 – 2005 and 2007. The transport was reversed (towards the Indian Ocean) during other periods. The upper layer transport above ∼200m depth is significantly correlated with the zonal wind stress in the western equatorial Pacific Ocean, with the transport lagging the winds by about 10 months. The middle layer transport between about 200 – 600m depth is significantly influenced by the zonal wind from the eastern equatorial Indian Ocean in which the zonal winds lag the ITF by about 5 months. In addition, the deeper layer transport below about 600m depth shows significant zero lag correlation with the zonal wind stress in the western equatorial Pacific Ocean, though the impact of the equatorial Indian Ocean zonal wind stress is not negligible.
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Papers by Pradanto Poerwono