An Investigation of Seismicity for the West Sumatra Region Indonesia

2nd International Conference on Mathematics, Science, Education and Technology

数学;自然科学;教育

Syafriani, S.^1

Departement of Physics, Faculty of Mathematic and Natural Sciences, Universitas Negeri Padang, Indonesia^1

关键词: Calculation results;    Geological models;    Historical data;    Rock conditions;    Seismic activity;    Seismic risk;    Seismotectonics;    West sumatra;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/335/1/012009/pdf
DOI  :  10.1088/1757-899X/335/1/012009

来源: IOP

【 摘 要 】

The purpose of this research was to investigate the seismicity of the West Sumatra region in the coordinates area of 94° E - 104° E and 2° N - 4° S. Guttenberg-Richer magnitude-frequency relation and seismic risk have been computed. Historical data of earthquakes used from year of 1970 to 2017 with magnitude higher than 4. The study area was divided into 8 sub-regions based on seismotectonic characteristics, plate tectonic and geological models. The determination of seismotectonic characteristics was based on the level of seismic activity in a region (a value) and rock stress condition (b value). High a value was associated with high seismic activity, whereas high b values were associated with low stress rock conditions, and vice versa. Based on the calculation results, a and b values were obtained in the interval of 5.5-11.3 and 0.7-2. The highest b value was obtained in the sub region 5 (Nias islands), while the lowest b value was obtained in sub region 7 (the Mentawai islands). The sub region 7, Mentawai Islands was indicated as the seismic risk potential areas.