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Jurnal Geofisika
Published by Himpunan Ahli Geofisika Indonesia
ISSN : 0854352     EISSN : 24776084     DOI : https://doi.org/10.36435/jgf
Core Subject : Science,
Earth & Planetary Sciences Energy Physics
Jurnal Geofisika [e-ISSN : 2477-6084] is a scientific journal published by Himpunan Ahli Geofisika Indonesia (HAGI). This journal is referenced, each paper was assessed and evaluated by editors and reviewers who are experts in the relevant fields and come from education institutions and industry, both from within and outside the country. The published article covers all science and technology including Geophysics, Meteorology, Oceanography, Geology and Geodesy.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geofisika
Articles 5 Documents
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Search results for , issue "Vol 16 No 1 (2018): Jurnal Geofisika" : 5 Documents clear
Interpretation of Dynamic Sediment Characteristic Based on Microtremor Analysis in Prambanan Region, Sleman Yogyakarta and Klaten Central Java, Indonesia Hesti Hesti; Subagyo Pramumijoyo; Djoko Wintolo
Jurnal Geofisika Vol 16 No 1 (2018): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2054.212 KB) | DOI: 10.36435/jgf.v16i1.24

Abstract

Yogyakarta earthquake on Mei 27, 2006 caused Prambanan area get quite severe damage marked by damageof resident house and Prambanan Temple.This study was conducted using data of microtremorsingle station and Yogyakarta earthquake 27 May 2006. Data were analyzed with microtremor HVSR methods to get the value of the dominant frequency (fo) and amplication (Ao).Furthermore, calculated the value of peak ground acceleration (PGA) in the layers of sedimen bedrock and seismic vulnerability index (Kg) to get ground shear strain value. Prambanan area has a dominant frequency (fo) value ranges from 0.63-6.78 Hz. Ground shear strain valueranges from 3,55.10-5 - 4,04.10-2.Each of these factors is then mapped with a division of 4 zones is very high, high, medium, and low.Based on the analysis of all these factors Prambanan area is an area that is vulnerable to the risk of earthquake events.
Temporary Seismic Stations Installation and Building Damage Assessment of December 7th, 2016 Earthquake in Pidie Jaya, Aceh, Indonesia Zulfakriza Z.; Andri D. Nugraha; M. Ridwan; Kadek P. Hendrawan; Muksin Umar; Muzli Muzli; Kemal Erbas; Daryono Daryono
Jurnal Geofisika Vol 16 No 1 (2018): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3922.767 KB) | DOI: 10.36435/jgf.v16i1.50

Abstract

A signicant Mw 6.5 earthquake occurred in Pidie Jaya, Aceh on December 7th, 2016. The event affected104 people death and more than 1000 people suered injuries due to the rubble of the building. Geologically, the region is composed by of Quaternary alluvial deposits. This is one of factor that amplication occurred in some area. On the other hand, an understanding of the source and mechanism of the earthquake needs to be done. A few days after the earthquake, we deployed 9 seismometers that covered the area of Pidie, Pidie Jaya and Bireuen. This experiment aims to record the aftershock and understanding of earthquake source and mechanism. In addition, we conducted building damage survey to know the pattern of distributionof building damage.
Estimation of Rock Physical Parameters Based on Digital Rock Physics Image, Case Study: Blok Cepu Oil Field, Central Java, Indonesia Handoyo Handoyo; Fatkhan Fatkhan; Fourier D. E. Latief; Harnanti Y. Putri
Jurnal Geofisika Vol 16 No 1 (2018): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2131.092 KB) | DOI: 10.36435/jgf.v16i1.53

Abstract

Modern technique to estimate of the physical properties of rocks can be done by means of digital imagingand numerical simulation, an approach known as digital rock physics (DRP: Digital Rock Physics). Digital rockphysics modeling is useful to understand microstructural parameters of rocks (pores and rock matrks), quite quickly and in detail. In this paper a study was conducted on sandstone reservoir samples in a rock formation. The core of sandstone samples were calculated porosity, permeability, and elasticity parameters in the laboratory. Then performed digital image processing using CT-Scan that utilizes X-ray tomography. The result of digital image is processed and done by calculation of digital simulation to calculate porosity, permeability, and elastic parameter of sandstones. In addition, there are also predictions of p-wave velocity and wave -S using the empirical equations given by Han (1986), Raymer (1990), and Nur (1998). The results of digital simulation (DRP) in this study provide a higher than the calculations in the laboratory. The digital rock physicsmethod (DRP) combined with rock physics modeling can be a practical and rapid method for determining the rock properties of tiny (microscopic) rock fragments
Application of Double Difference Tomography Method to Determine The 3D Seismic Wave Velocity Structure of GoLF Geothermal Field Kana N. Naamin; David P. Sahara; Andri D. Nugraha; Irvan Ramadhan
Jurnal Geofisika Vol 16 No 1 (2018): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2359.072 KB) | DOI: 10.36435/jgf.v16i1.62

Abstract

GoLF geothermal eld is located in South Solok Regency, 150 km SE of Padang city, West Sumatra.Geology, geochemistry and geophysical surveys had been conducted since 2008. Geophysical survey which had been performed including microseismic and magnetotelluric surveys. Seismic velocity structure modelling need to be conducted in order to characterize geothermal reservoir.This study uses microseismic data recorded from 36 seismometers which installed in two time recording time ranges; from September 2010 to April 2011 and from September 2012 to December 2013, with microseismic events recorded respectively 135 and 2692 events. To maximize the result of picking waveform, the data is processed using the Master Event Cross Correlation method to update the catalog data and get more accurate arrival time. Furthermore, the author used TomoDD software to produce hypocenter relocation and the 3D velocity structure under GoLF's geothermal reservoir. The results of the 3D velocity model can be used to determine the structure and phase of the fluid under GoLF geothermal field.
Estimation of Tsunami Inundation and Disaster Mitigation in Bulukumba, Indonesia Imanuela I. Pertiwi; Muhammad H. Fattah; Abdul Rauf
Jurnal Geofisika Vol 16 No 1 (2018): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3014.496 KB) | DOI: 10.36435/jgf.v16i1.13

Abstract

The study aims to determine the potential of earthquake that could lead to tsunamis in the Flores Sea. Furthermore, based on the potential of earthquake magnitude, can be known high run-up of tsunami in the southern coastal region of Bulukumba regency. The height run-up of tsunami can show the vulnerability of tsunami impact and eects spatially based on the eect of land function in the southern coastal area of Bulukumba Regency. To plan an eective mitigation scenario in the southern coastal area of Bulukumba Regency can be based on the vulnerability of tsunami impacts and eects. This study uses secondary data consisting of three data. The condition of land function and the density of community infrastructure is obtained basedon RTRW data of Bulukumba District and Satellite Bing Maps image data; historical data of earthquake events inthe Flores Sea from 1927 to 2016 from the USGS site, and BMKG; as well as topographic data. Field check activityon land function condition is done as a form of conformity of secondary data. The results showed that the potential of seismicity in the Flores Sea is high, with magnitude (M 7 SR) potentially causing tsunamis around it, not least Bulukumba Regency, South Sulawesi Province, Indonesia. The area of tsunami inundation in Bulukumba Regency is 13.617 km2. The coastal area of Ujungbulu sub-district is a dense residential area that has the highest risk to the tsunami with an estimated 3,331 km2 inundation. Land cover in Bontotiro sub-district dominated by vegetation with kerapatandengan interval distance of more than 3 m is seen able to reduce the tsunami with a height of 17 m and 25 m. Tsunami disaster mitigation scenario in Bulukumba regency is to make coastal area as conservation area of coastal forest (mangrove plant) that function as green belt of tsunamiwave holder.

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