The March 2017 earthquake sequence along the E-Wtrending Mcid Aicha-Debbagh Fault, northeast Algeria

Hichem Bendjama; Abelkarim Yelles-Chaouche; Oualid Boulahia; Issam Abacha; Yahia Mohammedi; Hamoud Beldjoudi; Sofiane Taki-Eddine Rahmani; Othmane Belheouane

doi:10.1007/s12303-020-0059-y

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자료유형: 학술저널

저자정보: Hichem Bendjama (Center of Research in Astronomy Astrophysics and Geophysics Algeria) Abelkarim Yelles-Chaouche (Center of Research in Astronomy Astrophysics and Geophysics Algeria) Oualid Boulahia (Center of Research in Astronomy Astrophysics and Geophysics Algeria) Issam Abacha (Center of Research in Astronomy Astrophysics and Geophysics Algeria) Yahia Mohammedi (Center of Research in Astronomy Astrophysics and Geophysics Algeria) Hamoud Beldjoudi (Center of Research in Astronomy Astrophysics and Geophysics Algeria) Sofiane Taki-Eddine Rahmani (Center of Research in Astronomy Astrophysics and Geophysics Algeria) Othmane Belheouane (Center of Research in Astronomy Astrophysics and Geophysics Algeria)

저널정보: 한국지질과학협의회 Geosciences Journal Geosciences Journal Vol.25 No.5

발행연도: 2021.10

수록면: 697 - 713 (17page)

DOI: 10.1007/s12303-020-0059-y

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In Northeast Algeria, a sequence of 143 small earthquakes (Md ≤ 4.7) occurred near the Mcid Aicha-Debbagh (MAD) Fault between 4 and 16 March, 2017. During this sequence, 74% of the seismic activity occurred in the first two days. Although the earthquakes were not large, they yielded important new information and have improved our understanding of seismic activity in three distinct regions along the fault. In the Sidi Dris region (western MAD Fault), 106 events (1 ≤ Md ≤ 3.2) were located in an aftershock cluster trending NNE-SSW, highlighting a transverse fault with ~6 km of strike-slip displacement that locally cuts the MAD Fault. In the El Kantour region (central MAD Fault), 31 events were recorded along a 3 km long fault segment, including the Mw 4.7 mainshock. The mainshock had a focal mechanism consistent with predominantly strike-slip motion on a N110°E-striking fault plane, in agreement with the WNW-ESE orientation of the central MAD Fault segment. Finally, six diffuse events occurred in the Hammam Debbagh region (eastern MAD Fault). A significant event (Md 3.0) in this region had a focal mechanism consistent with strike-slip movement and a normal component trending NW-SE. This is consistent with the fault plane orientations of key events in the time period 2003?2014, likely related to the NW-SE-striking Hammam Debbagh Fault. The present-day stress tensor is characterized by a strike-slip tectonic regime and a σ1 orientation (N342°E) that closely matches the maximum regional compressive stress orientation (NNW-SSE).

#Mcid Aicha-Debbagh Fault #strike-slip #focal mechanism #source parameter #waveform modeling

참고문헌 (55)

참고문헌 신청

Abacha, I. / 2015 / Étude de la sismicité de la région Nord-Est de l’Algérie

Abacha, I. / 2018 / The 2010 Beni-Ilmane, Algeria, earthquake sequence: statistical analysis, source parameters, and scaling relationships / Journal of Seismology 23:181~193

Abacha, I. / 2019 / Overview of recent seismic activity in northeastern Algeria / Proceedings of the 1st Springer Conference of the Arabian Journal of Geosciences (CAJG-1), On Significant Applications of Geophysical Methods :203~206

J. Angelier / 1977 / Sur une methode graphique de recherche des contraintes principales egalement utilisables en tectonique et en seismologie : la methode des diedres droits / Bulletin de la Société Géologique de France S7-XIX(6):1309~1318

Aoudia, A. / 2000 / Seismogenic potential and earthquake hazard assessment in the Tell Atlas of Algeria / Journal of Seismology 4:79~98

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