Garuda - Garba Rujukan Digital

Analisis Seismisitas dan Energi Gempabumi diKawasan Jalur Sesar OpakOyo Yogyakarta Nugroho Budi Wibowo; Juwita N S
Jurnal Sains Dasar Vol 6, No 2 (2017): October 2017
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Gempabumi yang terjadi di wilayah D.I Yogyakarta terjadi akibat aktifitas sesar yang terdapat dipermukaan, seperti Sesar Opak – Oyo, Sesar Dengkeng dan Sesar yang terdapat di Perbukitan Menoreh serta aktifitas lempeng tektonik yang terdapat di Selatan Pulau Jawa.Aktifitas sesar Opak Oyo dapat tercermin dari distribusi episenter dan energi gempabumi yang terjadi.Penelitian ini bertujuan menganalisis energi gempabumi yang memiliki episenter disekitar Sesar Opak Oyo secara spasial dan temporal.Berdasarkandata gempabumi tahun 2008 – 2016terdapat 66 event gempabumi dengan 11 event terasa.Distribusi episenter tergambar dalam peta seismisitas dan untuk parameter tektonik digunakan metode least square.Peta seismisitas kawasan Sesar Opak Oyo menunjukkan distribusi episenter lebih banyak di sebelah Timur dan Tenggara Jalur Sesar dengan nilai b hasil perhitungan metode least square yaitu 0.4.Secara temporal, terdapat trend peningkatan kejadian dari tahun 2008 hingga 2015 dan penurunan trend kejadian gempabumi dari tahun 2015 hingga 2017. Energi yang dihasilkan dari gempa pada kawasan Sesar Opak Oyo bervariasi dari 1x105.2 – 1x1012 Joule. Sedangkan, energi yang berasosiasi dengan keberadaan Jalur Sesar Opak memiliki nilaiberkisar antara 1x105.2 – 1x109.6 Joule dengan hiposenter 10 -20 Km.Pola sebaran energi memiliki pola yang hampir sama dengan formasi geologi dikawasan tersebut. THE ANALYSIS OF SEISMICITY AND EARTHQUAKE ENERGY IN OPAK-OYA FAULT AREA YOGYAKARTA Earthquake occurred in the Region of Yogyakarta were caused by fault activities on the surface, such as Opak-Oyo Fault, Dengkeng Fault and faults in the Menoreh Hills and plate tectonic activities in South of Java. Opak-Oyo Fault activity are reflected from epicenter distribution and earthquake energy. This research aimed to analyze the earthquake energy which has epicenter around the Opak-Oyo Fault in spatial and temporal. Based on earthquake catalogue from 2008 – 2016, there were 66 earthquakes with 11 significant events. Epicenter distribution was reflected in seismicity map and for the tectonic parameter least square method was used. Seismicity map of Opak-Oyo Fault area showed that distribution of epicenter in the Eastern and Southeastern of fault line with the calculation result of b value using least square method is 0.4. In temporal, there is an increasing trend of events in 2008-2015 and declining trend of earthquake in 2015-2017. Earthquake energy that released in Opak-Oyo Fault area has varying value about 1×105.2 – 1×1012 joules. Meanwhile, the energy that associated with the existence of Opak Fault Lines has value between 1×105.2 – 1×109.6 joule with hypocenter of 10-20 km. The energy distribution has similar pattern with geological formations in that area. Keyword : Opak-Oyo Fault, epicenter, seismicity, least square, energy.

RASIO MODEL Vs30 BERDASARKAN DATA MIKROTREMOR DAN USGS DI KECAMATAN JETIS KABUPATEN BANTUL Nugroho Budi Wibowo
Jurnal Sains Dasar Vol 6, No 1 (2017): April 2017
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Data Vs30 banyak digunakan dalam berbagai persamaan empiris. Data tersebut dapat diperoleh dari data mikrotremor dan model topografi USGS. Penelitian ini bertujuan untuk menghitung rasio antara Vs30 mikrotremor dan Vs30 USGS. Data yang digunakan sebanyak 11 titik pengukuran mikrotremor di Kecamatan Jetis dan model topografi yang diperoleh dari website USGS. Vs30 mikrotremor dihasilkan dari model ground profile dengan nilai misfit terendah. Hasil perhitungan menunjukkan Vs30 berdasarkan data mikrotremor di Kecamatan Jetis bervariasi dari 145,22 – 251,24 m/s. Vs30 USGS di Kecamatan Jetis bervariasi dari 243,07 – 384,35 m/s. Rasio Vs30 mikrotremor dan Vs30 USGS bervariasi dari 0,49 – 0,97. Hal ini menunjukkan bahwa data Vs30 USGS tidak berbeda jauh dengan hasil Vs30 data mikrotremor.Kata kunci: Vs30, Mikrotremor, Ground Profile Vs30 data are widely used in various empirical equations. Vs30 data can be obtained from microtremor data and topographic model from USGS. This study aimed to calculate the ratio between Vs30 from microtremor and Vs30 from USGS. The study used 11 points of microtremor data in Jetis and topographic model was obtained from USGS website. Vs30 from microtremor were generated from ground profile models with the lowest misfit values. The calculations show that Vs30 based on microtremor data in Jetis ranged from 145.22 - 251.24 m/s. Vs30 from USGS in Jetis ranged from 243.07 - 384.35 m / s. Ratio of Vs30 from microtremor and Vs30 from USGS vary from 0.49 - 0.97. This value indicates that the Vs30 data from USGS does not vary much with Vs30 data from microtremor.Keywords:Vs30, Microtremor, Ground Profile

Analisa Resiko Bahaya Seismik Berdasarkan Parameter Ketebalan Lapisan Sedimen dan Faktor Amplifikasi di Kecamatan Prambanan dan Gantiwarno Nugroho Budi Wibowo; Denny Darmawan; Zahroh Utami; Siti Patimah
Jurnal Sains Dasar Vol 7, No 2 (2018): October 2018
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jsd.v7i2.38553

Kecamatan Prambanan dan Gantiwarno merupakan wilayah yang terdampak gempabumi Yogyakarta 2006. Kedua kecamatan tersebut memiliki resiko bahaya seismik. Resiko bahaya seismik dapat dikaji dengan pendekatan ketebalan lapisan sedimen dan faktor amplifikasi. Kedua parameter tersebut dapat mempengaruhi penguatan gelombang seismik. Tujuan penelitian ini untuk mengetahui faktor amplifikasi, ketebalan lapisan sedimen dan potensi resiko bahaya seismik di Kecamatan Prambanan dan Gantiwarno. Penelitian ini menggunakan 30 data mikrotremor yang dianalisis dengan metode HVSR dan elipticity curve. Hasil penelitian menunjukkan bahwa frekuensi predominan di Kecamatan Prambanan dan Gantiwarno bervariasi dari 0,7 – 9,5 Hz. Faktor amplifikasi di Kecamatan Prambanan dan Gantiwarno bervariasi dari 0,5 – 8,7. Ketebalan lapisan sedimen di Kecamatan Prambanan dan Gantiwarno bervariasi dari 4,24 – 114,45 m. Mikrozonasi resiko bahaya seismik tinggi pada Kecamatan Prambanan berada di Desa Sanggrahan dan Cucukan, sedangkan pada Kecamatan Gantiwarno berada di Desa Sawit dan Ngandong.

Analisa Shakemap dan Jenis Sesar Studi Kasus: Gempa bumi Terasa di Purworejo – Jawa Tengah Nugroho Budi Wibowo; Dian Susri Nurhaci
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 7, No 1 (2017): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v7i1.5066

Earthquake July 18, 2016 at 5:59:00 am occur on land 18 Km Northwest Purworejo. The earthquake measuring 3.6SR at a depth of 13 kilometers and was felt in Purworejo I - II MMI. This study aims to analyze the earthquake affected based on shakemap analysis and determine the type of fault used the initial motion of P waves that recorded on seismograph. Shakemap analysis using shakemap application at BMKG servers based on the accelerograph network BMKG. Meanwhile, an analysis the type of fault using focal application with data input signals from the seismograph SeisComP3 system. The highest values of peak ground acceleration (PGA) recorded in BPBD Kebumen’s station is 0.5075 gal (EW component), 0.5018 gal (NS component) and 0.3538 gal (UD component). Model shakemap for Purworejo earthquake felt I SIG (I-II MMI) in Purworejo, Kebumen and Banjarnegara. The models of focal mechanism are the first nodal obtained strike 321, dip 33, rake 95, and the second nodal obtained strike 135, dip 57, rake 87. Based on the distribution model compression axis (up or T) and dilatation (down or P), the type of fault is reverse fault. The epicenter of the Purworejo earthquake correlated with the Rebung faultin Purworejo.Keyword: Shakemap, Focal Mechanism, PGA, Intensity, Earthquake, Fault.

Pemodelan Peak Ground Accleration (PGA) dan Intensitas Gempabumi berdasarkan Pengukuran Mikrotremor pada Kawasan Longsor di Desa Kalongan, Ungaran Timur Nugroho Budi Wibowo; Thaqibul Fikri Niyartama; Andi Andi; Rena Septiana; Erlina Widianingrum; Ahdian Azri Bustari; Iktifal Ajie Arif
Jurnal Fisika Unand Vol 13 No 2 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.2.225-233.2024

The landslide in Kalongan Village affected an area of 5 hectares and has the potential to experience further landslides. Landslides can occur with triggers of external factors such as earthquakes. The Peak Ground Acceleration (PGA) parameter can represent the impacts that occur on the surface in the form of earthquake intensity (MMI). Kalongan Village is 25.5km from the epicenter of the Ambarawa earthquake on 27 May 2023. This study aims to modeling the PGA microzonation and the intensity of the Ambarawa earthquake in the avalanche zone in Kalongan Village. The PGA model is based on measurements of 72 microtremor data in the avalanche zone using the Kanai method. Parameters of the Ambarawa earthquake with a magnitude of 2.5 and a depth of 5 km. The results of PGA modeling in the avalanche zone varied between 1.0-7.1 gal or I-II MMI values. The results of the PGA modeling show that aftershocks can occur if the strength of the Ambarawa earthquake reaches M=4 or 7.1-50.8 gal. The strength of the earthquake is equivalent to the intensity of II-V MMI.

Pemodelan Peak Ground Accleration (PGA) dan Intensitas Gempabumi berdasarkan Pengukuran Mikrotremor pada Kawasan Longsor di Desa Kalongan, Ungaran Timur Nugroho Budi Wibowo; Thaqibul Fikri Niyartama; Andi Andi; Rena Septiana; Erlina Widianingrum; Ahdian Azri Bustari; Iktifal Ajie Arif
Jurnal Fisika Unand Vol 13 No 2 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.2.225-233.2024

The landslide in Kalongan Village affected an area of 5 hectares and has the potential to experience further landslides. Landslides can occur with triggers of external factors such as earthquakes. The Peak Ground Acceleration (PGA) parameter can represent the impacts that occur on the surface in the form of earthquake intensity (MMI). Kalongan Village is 25.5km from the epicenter of the Ambarawa earthquake on 27 May 2023. This study aims to modeling the PGA microzonation and the intensity of the Ambarawa earthquake in the avalanche zone in Kalongan Village. The PGA model is based on measurements of 72 microtremor data in the avalanche zone using the Kanai method. Parameters of the Ambarawa earthquake with a magnitude of 2.5 and a depth of 5 km. The results of PGA modeling in the avalanche zone varied between 1.0-7.1 gal or I-II MMI values. The results of the PGA modeling show that aftershocks can occur if the strength of the Ambarawa earthquake reaches M=4 or 7.1-50.8 gal. The strength of the earthquake is equivalent to the intensity of II-V MMI.

Title

Found 6 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 6 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 6 Documents
Search