The 2014 Mihoub earthquake (Mw4.3), northern Algeria: empirical Green’s function analysis of the mainshock and the largest aftershock

Semmane, Fethi; Benabdeloued, B. Y. N.; Heddar, A.; Khelif, M. F.

doi:10.1007/s10950-017-9671-3

Cited by 15 publications

(5 citation statements)

References 21 publications

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“…Our results are consistent with previous studies and con rm the fault segments identi ed by (Semmane et al, 2017, Khelif et al, 2018. However, some anomalies remain unidenti ed due to limited resolution and ray coverage, and the smearing effect of ray paths to seismic stations should be considered.…”

Section: Resultssupporting

confidence: 92%

“…Anomaly (2) intersects anomaly (1) at a depth of 8 km, indicating the depth limit of the fault, consistent with previous research Khelif et al (2018). The 2014 earthquake (blue star) occurred at the boundary between anomalies ( 2) and (3), consistent with the fault segment associated with this event (Semmane et al, 2017).…”

Section: Resultssupporting

confidence: 88%

“…While other seismotectonic studies have focused on various aspects of the Mihoub region, such as fault analysis or seismicity patterns, our research uses local earthquake tomography to investigate the underlying structures. By using LOTOS, we can clarify the fault zones mentioned in (Semmane et al, 2017, Khelif et al, 2018 and have a more thorough knowledge of the crustal characteristics in the Mihoub region. This alternative approach using local earthquake tomography with a challenging dataset of 500 aftershocks allows us to uncover valuable insights speci cally within the study area, thereby enhancing our understanding of the seismology and tectonics of the Mihoub region.…”

Section: Introductionmentioning

confidence: 99%

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Subsurface Structures of the 2016 Mihoub Earthquake Sequence in North-Central Algeria Using Local Earthquake Tomography

kameche,

hammoud,

issam

et al. 2024

Preprint

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This study investigates the Mihoub region within the Blida Mountains of the Tellian Atlas(Abacha et al., 2014), an area prone to earthquakes due to the Africa-Eurasia plate convergence since the Late Cretaceous. We present both the 1910 Aumale earthquake (Ms 6.6 and I0=VIII) and the 2016 seismic sequence (Mw 5.3). Using local seismic tomography (LET) with Local Tomography Software in its twelfth version (LOTOS 12), we analyze velocity anomaly patterns and their correlation with subsurface structures in the Mihoub area. Our dataset includes 503 well-localized aftershocks from the 2016 seismic sequence. Results show consistent patterns, with positive anomalies associated with rigid block structures and negative anomalies associated with basins, recent formations, and tectonic structures. In particular, a NE-SW corridor of low-velocity anomalies aligns with Miocene and Oligocene formations. Mainshock and aftershock epicenters from the 2016 sequence align with the boundary between low and high-velocity anomalies, indicating the Mihoub Fault zone. Fault depth analysis suggests a maximum depth of 8 km, consistent with previous research. Vertical sections confirm similar azimuths and dips of fault segments involved in the 2016 and 2014 mainshocks. This study provides valuable insights into velocity anomaly patterns and their relationship to fault structures, enhancing the understanding of fault systems and seismic hazards in the Mihoub area.

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Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Subsurface Structures of the 2016 Mihoub Earthquake Sequence in North-Central Algeria Using Local Earthquake Tomography

kameche,

hammoud,

issam

et al. 2024

Preprint

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“…1), on 28 May 2016 (Khelif et al, 2018). Two other moderate events were recorded on 23 May 2013 (Mw 4.2) and 15 November 2014 (Mw 4.3) in the Mihoub region (Semmane et al, 2017). These seismic sequences can be studied to improve our understanding of regional earthquake characteristics and the active geologic structures in the region.…”

Section: Historical and Instrumental Seismicitymentioning

confidence: 96%

“…The source parameters computed by these two methods are the moment magnitude (Mw), focal mechanism (strike, dip, and rake), and seismic moment (M 0 ). We analyze the seismic sources of the main events in the (1) 29 September 1989 Mw 6.0 Mont-Chenoua (Tipasa) earthquake (Bounif et al, 2003); (2) 2 September 1990 Mw 4.7 Tipaza earthquake (Sebaı ¨& Ouahmed, 1997); (3) 4 September 1996 Mw 5.6 Ain Benian earthquake (Sebaı ¨& Ouahmed, 1997); (4) 21 May 2003 Mw 6.0 Boumerdes-Zemmouri earthquake (Ayadi et al, 2003;Bounif et al, 2004) (Semmane et al, 2015); (8) 15 November 2014 Mw 4.3 Mihoub earthquake (Semmane et al, 2017); (9) 1 August 2014 Mw 5.7 Algiers Bay earthquake (Beldjoudi, 2017); (10) 28 May 2016 Mw 5.4 Mihoub earthquake (Khelif et al, 2018) sequence using broadband seismogram records from the Algerian Digital Seismic Network (ADSN) to determine whether these events are connected. Then, we calculate the stress tensor in the region, compute the regional Coulomb stress failure criterion and finally discuss the implications for the regional stress state.…”

Section: Introductionmentioning

confidence: 99%

The 2007 Medea Seismic Sequence, North-Central Algeria: Source Parameters, Stress Tensor, and Static Stress Changes

Dabouz

Beldjoudi

Delouis

et al. 2021

Pure Appl. Geophys.

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Dense seismic networks provide the opportunity to better understand seismogenic processes in tectonically active regions. The Algerian Digital Seismic Network was strengthened following the 10 October 1980 Ms 7.3 El Asnam and 21 May 2003 Mw 6.8 Bournerdes earthquakes, such that the source parameters of small-to moderate-magnitude earthquakes in northern Algeria can now be computed. Here we examine the 2007 seismic sequence recorded in the Medea region (north-central part of Algeria). We calculate the seismic sources of three moderate events that occurred between May and August 2007 using near-field waveform modeling, and obtain moment magnitudes of 4.4, 4.1, and 4.6, with fault planes oriented N63°E, N15°E, and N219°E, respectively. We use displacement spectra to estimate the corner frequency f c and spectral flat level then use these to recalculate the seismic moment and moment magnitude. The stress tensor obtained by inverting 13 focal mechanisms from events near the 2007 sequence exhibits a well-constrained compressional axis with a subhorizontal N335°Etrending r 1 axis (plunge 7°). We calculate the static stress changes to understand the connections between these three events. The results indicate an interaction between the faults related to these events during the earthquake sequence. We conclude that these events likely occurred on the unstudied extensions of mapped faults, and that the epicentral area therefore has moderate seismogenic potential.

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A Glimpse at the History of Seismology in Algeria

Harbi

Sebai

Boughacha

2018

The Geology of the Arab World---an Overview

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The 2014 Mihoub earthquake (Mw4.3), northern Algeria: empirical Green’s function analysis of the mainshock and the largest aftershock

Cited by 15 publications

References 21 publications

Subsurface Structures of the 2016 Mihoub Earthquake Sequence in North-Central Algeria Using Local Earthquake Tomography

Subsurface Structures of the 2016 Mihoub Earthquake Sequence in North-Central Algeria Using Local Earthquake Tomography

The 2007 Medea Seismic Sequence, North-Central Algeria: Source Parameters, Stress Tensor, and Static Stress Changes

A Glimpse at the History of Seismology in Algeria

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