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All Journal Wahana Fisika : Jurnal Fisika dan Terapannya Jurnal Sains Dasar Jurnal Tata Kota dan Daerah INDONESIAN JOURNAL OF APPLIED PHYSICS Jurnal Ilmu Fisika dan Terapannya (JIFTA)
Nugroho Budi Wibowo
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Astronomy Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Physics Social Sciences Transportation

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Analisis Spasial Respon Bendungan terhadap Model Peak Ground Acceleration (PGA) Berdasarkan Karakteristik Mikrotremor, Geologi Regional dan Amatan Instrumentasi pada Bendungan Sermo Kulonprogo Wibowo, Nugroho Budi; Gunawan, Arif
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 4, No 02 (2014): IJAP Volume 04 Issue 02 Year 2014
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v4i02.4972

Abstract

This study is a comprehensive-descriptive analysis elaboration to seismic hazards on Sermo Dam, while in terms of microtremor characteristic (PGA model), its regional geology and observation of instrumentation on it. Sermo Dam is the only one water resources infrastructure which lies in The Yogyakarta Province at time of earthquake disaster happened on May 2006. Basic theories used in this case are HVSR methods, determining sediment thickness, and Kanai Method for Maximum Ground Acceleration, Then, based on these we can analyze characteristics of responsiveness damin the form of local spatial region focused by amplitude (A), dominance frequency (fo), time period (T), sediment thickness (H) and Peak Ground Acceleration (PGA) based on microtremor approarch with seismograph TDS 303S. Besides, by an analysis on regional geology that can be obtainable the characteristic of Sermo Dam foundation which lies on the Old Andesite (Kebo Butak) Formation. They are relatively robust when subjected to seismic vibration of middle class to below (less than 7 Richter scale on design). Also it has some declining periodic trends by main dam whereas there is still in the initial stage of design tolerance. The final result is zoning classification of damagepotential with: (1) region by PGA values of 0.04≤ a <0.15g which they are minor impact damage on their buildings; (2) region by PGA values of 0.15≤ a <0.34g which they are medium impact damage on their buildings. The damage level is comparable by inclining of filler material thickness at damsite.
Intepretasi Lapisan Sedimen berdasarkan Ground Profile Vs dengan Pengukuran Mikrotremor di Kecamatan Pacitan Wibowo, Nugroho Budi; Sembri, Juwita Nur; Darmawan, Deny; Sumardi, Yosafat; Afriliani, Fitria; Mahmudah, Siti
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 8, No 1 (2018) : IJAP Volume 8 ISSUE 01 YEAR 2018
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v8i1.14986

Abstract

Ketebalan lapisan sedimen pada suatu wilayah dapat menyebabkan local site effect ketika terjadi gempabumi. Hal ini dikarenakan ketebalan lapisan sedimen berpengaruh terhadap amplifikasi. Kota Pacitan berdasarkan formasi geologi berada pada Formasi Aluvium (Qa) yang didominiasi lapisan sedimen. Penelitian ini bertujuan mengintepretasi ketebalan lapisa sedimen di Kecamatan Pacitan berdasarkan model ground profile Vs hasil akuisisi mikrotremor. Akuisisi dilakukan pada 25 titik di Kecamatan Pacitan menggunakan seimograph portable TDS. Ground profile Vs hasil pemodelan elipticity curve  menunjukkan bahwa nilai Vs bervariasi dari 153.11 m/s  (Formasi Aluvium) sampai 1393.48 m/s (Formasi Batuan Terobosan Andesit). Model ground profile Vs lapisan kedua yang berkorelasi dengan lapisan sedimen berada pada nilai Vs< 750 m/s dengan area di Dataran Aluvial Sungai Grindulu dan Teluk Pacitan. Ketebalan lapisan sedimen hasil analisa ground profile Vs, bervariasi dari 2.59 – 94.37 m. Lapisan sedimen paling tebal terdapat pada Formasi Aluvium (Qa) dengan ketebalan 94.37 m, dan lapisan sedimen paling tipis terdapat pada Formasi Jaten (Tmj) setebal 2.59 m. Lapisan sedimen dengan ketebalan lebih dari 50 m berada di kawasan Kota Pacitan, Teluk Pacitan dan Sungai Grindulu.
Interpretasi Struktur Bawah Tanah pada Sistem Sungai Bribin dengan Metode Geo Aziz, Khafidh Nur; Sumardi, Yosaphat; Darmawan, Denny; Wibowo, Nugroho Budi
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 6, No 01 (2016): IJAP VOLUME 06 ISSUE 01 YEAR 2016
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v6i01.1796

Abstract

This research was aimed to determine the distribution pattern of magnetic field anomaly and to identify the lithology of underground structure in Bribin Karst using geomagnetic method. Research location was Semanu Sub-district, Gunungkidul Regency at UTM coordinate of 464061 mT-464929 mT and 9111097 mU-9111970 mU. The data were taken using G-5 Proton Precession Magnetometer (PPM) by looping method. The result showed that the distribution pattern of the magnetic field anomaly in Karst Bribin has value of 330 nT - 530 nT and anomaly values reflecting the system of Bribin River has value of 400 nT-460 nT. The lithology of underground structure in Karst Bribin has susceptibility value of -0.069 (in SI) - 0.0661 (in SI) with depth 200 m associated with limestone, tuff, gypsum, rock salt, and minerals calcite and anhydrite and the lithology associated with the system of Bribin River has susceptibility value -0.069 (in SI) associated with gypsum, rock salt, and minerals anhydrite.
Analisis Seismisitas dan Energi Gempabumi di Kawasan Jalur Sesar Opak Oyo Yogyakarta Wibowo, Nugroho Budi; Sembri, Juwita Nur
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 7, No 2 (2017): IJAP Volume 07 ISSUE 02 YEAR 2017
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v7i2.13702

Abstract

The earthquake that occurred in the Region of Yogyakarta caused by fault activity on the surface, such as Opak-Oyo Fault, Dengkeng Fault, Menoreh Fault  and plate tectonic activity in South of Java. Opak-Oyo fault activity reflected from epicenter distribution and earthquake energy. This research aims to analyze the earthquake energy which has epicenter around the Opak-Oyo Fault in spatial and temporal. Based on earthquake catalog from 2008 – 2016, there were 66 earthquake with 11 significant event. Epicenter distribution reflected in seismicity map and for the tectonic parameter use least square method. Seismicity map of Opak Oyo Fault area show that distribution of epicenter in the East and Southeast of fault line with the calculation result of b value by least square method is 0.4. In temporal, there is an increasing trend of events in 2008-2015 and decline trend of earthquake in 2015- 2017. Earthquake energy that released in Opak Oyo Fault area has varies value about 1x105.2 – 1x1012joules. Meanwhile, the energy that associated with the existence of Opak Fault Lines has value between 1x105.2 – 1x109.6 Joule with 10-20 km of hypocenter.The distribution energy has similar pattern with geological formations in that area. 
IDENTIFIKASI DAERAH LONGSOR KECAMATAN BAGELEN MENGGUNAKAN METODE MIKROTREMOR Petiwi, Gofur Dyah Ayu Gilang; Wibowo, Nugroho Budi; Darmawan, Denny
Wahana Fisika Vol 3, No 2 (2018): December
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/wafi.v3i2.12740

Abstract

Kecamatan Bagelen merupakan wilayah di sisi barat Pegunungan Menoreh yang mengalami tanah longsor akibat adanya perubahan kondisi geologi menjadi material lepas dan terlongsorkan. Penelitian ini bertujuan untuk mengetahui karakteristik daerah longsor di Kecamatan Bagelen berdasarkan persebaran dan pemodelan parameter mikrotremor, yaitu frekuensi predominan, faktor amplifikasi, ketebalan lapisan sedimen, dan indeks kerentanan seismik. Data mikrotremor diolah dengan metode HVSR dan metode Ellipticity Curve. Hasil penelitian menunjukkan bahwa nilai  daerah longsor adalah 6-8 Hz, nilai  adalah 6-7, dan nilai  adalah 5×10−4 - 1,1×10−3 s2/m. Ketiga parameter tersebut berada dalam kategori sedang hingga tinggi serta nilai ketebalan sedimen 20-50 m.Bagelen District located in the west of Menoreh Mountain that had landslide caused by deformation. The research aimed to characterize the landslide area in Bagelen District based on microtremor parameters: predominant frequency, amplification factor, sediment layer thickness, and seismic vulnerability index. Data in the form ofmicrotremor signals were then processed by HVSR and ellipticity curve method. The results of the research showed that the value of 𝑓0 ranged from 6 to 8 Hz, the value of 𝐴 ranged from 6 to 7, the value of 𝐻 ranged from 20 to 50 m and the value of 𝐾𝑔 ranged from 5×10−4 - 1,1×10−3 s2/m. The parameter was on medium and high categories with 20 - 50 m sediment layer thickness.
Spatial Analysis To Predict Conservation Heritage’s Damage Of “Imogiri Graves” By Using Microtremor Measurements Gunawan, Arif; Wibowo, Nugroho Budi
Jurnal Tata Kota dan Daerah Vol 5, No 1 (2013)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The paper gives you a description more comprehensive views to learn spatial aspect in relating to the effects of earthquake damage in human civilization which is one of them is for Imogiri Graves Area. These ones are important place for Mataram Kingdom funerals. Based on last observation, this location was partially destroyed by earthquake disaster like other places in Bantul Regency. The theories could be embedded in this cases which consists of Kanai methods for Ground Acceleration and Ground Shear Stress (GSS). Then, deriving from those we can analyze the spatial aspect of disaster prone area which emphasizing into figure out Peak Ground Acceleration (PGA) and Seismic Susceptible Index (Kg)-Ground Shear Stress (GSS) as well. The results are: (1) PGA’s area are showed 129-174 gal and directly connected to damage ratio for buildings; (2) Seismic Susceptible Indexes (Kg) are below 20 which means Imogiri area was a safe zone (with low-risk susceptible).Keywords: Spatial, Microtremor, PGA, Kg, Imogiri
Microtremor characteristics and analysis of seismicity on Opak fault lines, Bantul district, Yogyakarta Merizka Marsyelina; Nugroho Budi Wibowo; Denny Darmawan
Jurnal Sains Dasar Vol 3, No 1 (2014): April 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2254.022 KB) | DOI: 10.21831/jsd.v3i1.2800

Abstract

This research aimed to determine the microtremor characteristics and seismicity analysis around Opak’s fault in  Jetis subdistrict, Imogiri subdistrict,  Pundong  subdistrict, and Kretek subdistrict. This research using HVSR (Horizontal to Vertical Spectral Ratio) method, spectrum analysis, TFA analysis and maximum likelyhood method. The primary microtremor’sdata was taken from 9 points and thesecondary data from 32 point using grid 3 km spacing. The data record the natural waves or seismic signals at each measurement points. The processed data thus characterize the structrure of the soil and rock layers. For seismicity of analysis earthquake data since 2006-2014 from BMKG were used. The results indicate microtremor characteristics around the fault Opak according to the parameter map predominant frequency modeling result, map predominant period modeling result, map amplification factor modeling result, map Vs30 modeling result, curve H/V, curve spectrum and curve TFA which is divided into three zones. Seismicity analysis showed that earthquake around Opakfault earthquake has magnitude between  0,4 to 3,2,  has a depthof 10 km to 20 km, and has a  b-value of 0,44 to 0,76.   Key words: HVSR method, TFA analysis, spectrum analysis, maximum likelihood method, microtremor characteristics, b-value, Opak fault
Identifikasi Jalur Sesar Opak Berdasarkan Analisis Data Anomali Medan Magnet dan Geologi Regional Yogyakarta Ira Maya Fathonah; Nugroho Budi Wibowo; Yoshaphat Sumardi
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 4, No 02 (2014): IJAP Volume 04 Issue 02 Year 2014
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v4i02.4990

Abstract

This research was aimed to know the magnetic field anomaly pattern upon Opak’s fault, to identify the direction of Opak’s fault and the structure of Opak’s fault based on Geomagnetic data. It was conducted in the vicinity of Opak’s fault in Pundong sub-district, Yogyakarta. It used magnetic method which is based on rocks magnetic susceptibility. The data were taken by G-856AX Proton Precision Magnetometer (PPM) using looping method. Data analysis was done using diurnal variation and IGRF correction, reduction to pole, upward continuation and under surface structure modelling. From magnetic field anomaly analysis, it was discovered that magnetic field anomaly on Opak’s fault has -50 nT negative closure in the East, and 100 nT positive closure in the West. According to the result interpretation of 2.5D model on two slices using Mag2DC software, it can be obtained that the under surface structure of Opak’s fault consist of Young Alluvial formation, Nglanggran formation, Semilir formation, Kebo Butak formation, and Wungkal Gamping with various thickness. The location of this Opak’s fault is almost the same with the location of Opak’s fault in Yogyakarta geology map. Opak’s fault around Pundong sub-district is a normal fault directed to N 35º E. The eastern part of the fault has a relatively constant movement, while the western part is relatively moving down.
Analisis Peak Ground Acceleration (PGA) dan Intensitas Gempabumi berdasarkan Data Gempabumi Terasa Tahun 1981 - 2014 di Kabupaten Bantul Yogyakarta Nugroho Budi Wibowo; Juwita Nur Sembri
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 6, No 01 (2016): IJAP VOLUME 06 ISSUE 01 YEAR 2016
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v6i01.1804

Abstract

Seismic historical record in Java period of 1981-2014 recorded that the Special Region of Yogyakarta was hit by damaging earthquake 4 times and hundreds of small earthquakes felt. This research was aimed to assess the peak ground acceleration (PGA) zone and the earthquake intensity based on historical data of earthquake occurrence in 1981-2014. Peak Ground Acceleration was calculated using Kanai equation and earthquake intensity using Wald equation. This research was conducted by using 231 microtremor data in Bantul District that derived from BMKG and also 147 data of damaging earthquake and small earthquake felt from BMKG. The result of this study represent peak ground acceleration value in Bantul District which was varied from 57.7-412.7 gal. Peak Ground Acceleration Zonation of Bantul District was diveded by 3 zones; first zone with PGA value 57.7-91 gal, the second zone with PGA value 92-179 gal and the third zone with PGA value higher than 180 gal. While based on earthquake intensity, Bantul District has damage potential of V-VII MMI in intensity scale.
ANALISIS LITOLOGI LAPISAN SEDIMEN BERDASARKAN METODE HVSR DAN DATA BOR DI KAWASAN JALUR SESAR OPAK ANALYSIS OF SEDIMENT LAYER LITHOLOGY BASED ON HVSR METHOD AND BOREHOLE DATA IN OPAK FAULT LINES AREA Arif Sudrajat; Nugroho Budi Wibowo; Denny Darmawan
Jurnal Ilmu Fisika dan Terapannya (JIFTA) Vol 6, No 2 (2017): Jurnal Fisika
Publisher : Prodi Fisika, Departemen Pendidikan Fisika

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Abstract

AbstrakTelah dilakukan penelitian tentang analisis litologi lapisan sedimen di kawasan jalur Sesar Opak.Penelitian ini bertujuan untuk mengetahui variasi kedalaman lapisan sedimen dan memetakan zona rawan gempa berdasarkan metode HVSR dan data bor di kawasan jalur Sesar Opak. Penelitian ini dilakukan di wilayah jalur Sesar Opak yang berada di daerah Bantul hingga Prambanan pada koordinat geografis 7,7580 LS – 7,9390 LS dan 110,3460 BT – 110,5320 BT dengan 86 titik penelitian. Data mikrotremor dianalisis menggunakan metode Horizontal to Vertical Spectral Ratio (HVSR) untuk mendapatkan nilai frekuensi predominan dan faktor amplifikasi pada setiap titik penelitian.Hasil analisis mikrotremor digunakan untuk menentukan ketebalan lapisan sedimen dan divalidasi menggunakan data bor di wilayah tersebut yang didapatkan dari Disperindagkop Bidang Pertambangan dan Energi Provinsi D.I. Yogyakarta untuk mendapatkan litologi lapisan sedimen wilayah penelitian. Hasil penelitian ini menunjukkan wilayah yang memiliki nilai ketebalan sedimen relatif tebal yakni 73,75 m sampai dengan 135,37 m berada di sebelah barat jalur Sesar Opak, bagian utara di wilayah Kalasan, Depok, Berbah bagian barat dan utara, Prambanan bagian barat, Piyungan bagian barat daya, Banguntapan dan Kotagede, Pleret bagian barat dan sebagian kecil Pleret bagian timur serta beberapa daerah lain yakni wilayah Kretek dan Pundong. Wilayah lain seperti Jetis, Imogiri, Panggang, Bambanglipuro, sebagian daerah Sewon, Piyungan bagian utara dan Prambanan bagian selatan cenderung memiliki ketebalan sedimen yang lebih tipis antara 3,7 m sampai 69,3 m. Daerah penelitian yang memiliki resiko rawan terhadap gempa bumi berada di Zona I (Bambanglipuro, Pundong dan Kretek) dan Zona IV (Kalasan, Depok, Berbah, Kotagede, Banguntapan, dan sebagian wilayah Prambanan) dengan ketebalan lapisan sedimen yang tebal (73,75 m sampai 135,37 m). Sedangkan daerah yang memiliki resiko rawan gempa bumi relatif lebih kecil berada di Zona II (Imogiri, Jetis dan sebagian daerah Pleret) dan Zona III (Sebagian daerah Prambanan dan Piyungan) dengan ketebalan lapisan sedimen tipis (3,7 m sampai 69,3 m).Kata kunci: Sesar Opak , HVSR, mikrotremorAbstractThe research about analysis of sediment layer lithology in Opak fault lines had been finished. The aim of this study was to identify variation of sediment layers lithology and mapping the earthquake-prone zones based methods HVSR and borehole data in the area of Opak fault lines. The area of this research was in the area of Opak fault lines which located in Bantul until Prambanan at geographical coordinates 7.7580 LS - 110.3460 LS and 7.9390 BT - 110.5320BT using 86 research points. The microtremor signals analyzed using Horizontal to Vertical Spectral Ratio (HVSR) to get the predominan frequency and amplification factors at each point. The result of microtremor analysis was used to determine the value of sediment thickness (H) and was validated using borehole in the area to get sediment layers lithology of the research area. The results of this research indicate that area with thick sediment layer thickness is 73,75 m to 135,37 m was in west side of Opak fault lines, northen part of Kalasan, Depok, western part and northen part of Berbah, western part of Prambanan, southwestern part of Piyungan, Banguntapan and Kotagede, western part of Pleret and small region in eastern part of Pleret and others area like Kretek and Pundong. The other areas like Jetis, Imogiri, Panggang, Bambanglipuro, partially Sewon, northen part of Piyungan and southern part of Prambanan have thinner sediment thickness between 3,7 m to 69,3 m. The area of research which have risk-prone to earthquakes was in Zone I (Bambanglipuro, Pundong and Kretek) and Zone IV (Kalasan, Depok, Berbah, Kotagede, Banguntapan, and part of Prambanan) with thick sediment layer thickness (73, 75 m to 135.37 m). While the risk-prone area which have relatively smaller earthquakes was in Zone II (Imogiri, Djetis and parts Pleret) and Zone III (some part of Prambanan and Piyungan) with thin sediment layer thickness (3.7 m to 69.3 m).Keywords: Opak fault lines, HVSR, microtremor signals
Co-Authors Achmad Maulana Achsan Afriliani, Fitria Arif Gunawan Arif Sudrajat Aziz, Khafidh Nur Darmawan, Deny Denny Darmawan Denny Darmawan Heningtyas Heningtyas Ika Kurnaiwati Ika Kurniawati Imdadu Rohman Ira Maya Fathonah Juwita Nur Sembri Laila Katriani Meita Aulia Sari Meita Aulia Saru Merizka Marsyelina Mifta Arunahul Janah Nining Pratiwi Petiwi, Gofur Dyah Ayu Gilang Rifka Addawiyah Sembri, Juwita Nur SITI MAHMUDAH Sumardi, Yosafat Ulfa Fadhilah Umi Habibah Yosaphat Sumardi Yosaphat Sumardi Yoshaphat Sumardi Yuni Setiawati