EVALUATION OF SEISMIC HAZARD USING TECTONIC FAULT DATA: CASE OF BENI-CHOUGRANE MOUNTAINS (WESTERN ALGERIA)
1
Mascara University, Laboratory of Biological Research and Geomatics (LRSBG), Pbox 305, Mamounia Road, Mascara, Algeria.
2
Faculty of Sciences of the Earth and the Universe. University of Oran2 Mohamed BENAHMED, Bir Djir, Oran 31000, Algeria
Autor do korespondencji
Refas Soria
Mascara University, Laboratory of Biological Research and Geomatics (LRSBG), Pbox 305, Mamounia Road, Mascara, Algeria.
Mascara University, Laboratory of Biological Research and Geomatics (LRSBG), Pbox 305, Mamounia Road, Mascara, Algeria.
Mining Science 2019;26:123-145
SŁOWA KLUCZOWE
DZIEDZINY
STRESZCZENIE
Abstract: In the world, people are increasingly exposed to natural hazards such as earthquakes. To this end, seismic risk mapping remains an essential topic of study in order to minimize their destructive effects. These maps are needed for both seismic risk management and for the design of infrastructure. The challenge is to take into account local information provided by seismic sources (historical seismicity) as well as information related to active tectonic faults.
In this article, we calculated the seismic risk in the Mascara Mountains (western Algeria) using the geo-metric characteristic of known faults. This study is based on an important collection of a tectonic database of these faults (Nature, geometry and geological context). This information is relevant for their seismic potential. Indeed, by including these formations we tried to compute the seismic risk this region characte-rized by weak seismicity. Our results show more or less alarming facts. Indeed, the magnitude values calculated are between 4.85 and 7.25, whereas the magnitudes obtained by experimental seismicity do not exceed 6 on the Richter scale. The values of the maximum ground acceleration (PGA) are between 0.03 and 0.28g. These results were compared with assessments made on the basis of historical seismicity; the maximum values obtained do not exceed 0.2 g. The higher values of magnitude calculated from the active faults is due to: (i) the nature of the faults (inverse, normal and strike slip), (ii) the geometry (length and depth) and (ii) that some of these faults may have an aseismic character.
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