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All Journal Pillar of Physics: Jurnal Berkala Ilmiah Fisika
Ardiyansyah Sabarani
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Earth & Planetary Sciences Materials Science & Nanotechnology Physics

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The estimation of maximum ground acceleration value in West Sumatra region based on the M 8.8 SR earthquake scenario using MC Guire (1963) and Donovan (1973) empirical formula. Mia Leviana; Syafriani Syafriani; Ardiyansyah Sabarani
PILLAR OF PHYSICS Vol 10 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (565.511 KB) | DOI: 10.24036/2542171074

Abstract

West Sumatra is one of the regions is prone to earthquakes because it the positions of an active seductions zone between the Indo-Australian plate and the Eurasian Plate is along the Sumatra fault. The maximum ground acceleration is one of the important parameters, because it describes the strength of  earthquake vibration ever  happened. Therefore, it is necessary to do measurement and calculation of ground acceleration caused by earthquakes. By knowing the maximum ground acceleration values  in an area, we can  know  which area is prone to earthquakes. Data were analyzed by an earthquake scenario is created, and the epicenter 1.00o LS 99.00o BT, M = 8.8 magnitude and a depth of 30 km. Formulation of Mcguire (1963) and Donovan (1973) is used to find the value of the maximum ground acceleration and Murphy O'Brein empirical formula to find the value of intensity. The maximum ground acceleration value for each county / city in West Sumatra is calculated by using the position of the district / city as a reference point. The results of data processing maps obtained Peak Ground Acceleration (PGA) and the intensity of the earthquake. The analysis showed that the value of the PGA and the greatest intensity being Pariaman with a value PGA 177.59 gal and has a value of 7.67 MMI intensity. Then the value of the maximum ground acceleration both owned by the  Mentawai Islands with 176.72 gal and intensity value is 7.66 MMI.
Analysis of seismic changes rate based on the seismotectonic spatial distribution of West Sumatra region Wela Yulianda; Syafriani Syafriani; Ardiyansyah Sabarani
PILLAR OF PHYSICS Vol 9 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (819.675 KB) | DOI: 10.24036/2506171074

Abstract

West Sumatra has a high level of seismicity so as often rocked by significant earthquakes and caused damage. The earthquake is usually preceded by symptoms such as occurrence of a seismic Quiescence phenomenon. This phenomenon can be seen by observing seismic rate changes in a region. The observation used data from NEIC / USGS and ISC with time period from 22nd of September 1918 to 31st of October 2015. The method used to analyze the seismic rate changes is the z-value method. The study area is divided into several grids. Z-value of each grid is counted and will be spatially distributed so seismic rate change of West Sumatra can be analyzed. This analysis will show presence or absence of seismic Quiescence phenomenon before earthquake in West Sumatera. The observation result showed that there is a certain preceding phenomenon before the significant earthquake in 1943 (7.8 SR) and 2007 (7.8 SR) in West Sumatra. This phenomenon called seismic Quiescence can be used as earthquake precursor. At the beginning of 2015 showed the decrease in seismic activity in several regions in West Sumatra according to development of seismic activity data. It is suspected as early symptoms of impending significant earthquake in future
Co-Authors Mia Leviana Syafriani Syafriani Wela Yulianda