Civil Engineering and Architecture 8(6): 1491-1496, 2020 DOI: 10.13189/cea.2020.080630 http://www.hrpub.org Triggered Seismicity in Northern Algeria from a Statistical Modeling L. Amir * , L. Abdessamed Department of Geophysics, Faculty of Earth Sciences and Geography, USTHB, BP 32, Bab Ezzouar, 16111,Algiers, Algeria Received October 12, 2020; Revised December 10, 2020; Accepted December 20, 2020 Cite This Paper in the following Citation Styles (a): [1] L. Amir, L. Abdessamed , ”Triggered Seismicity in Northern Algeria from a Statistical Modeling,” Civil Engineering and Architecture, Vol. 8, No. 6, pp. 1491-1496, 2020. DOI: 10.13189/cea.2020.080628. (b): L. Amir, L. Abdessamed , (2020). Triggered Seismicity in Northern Algeria from a Statistical Modeling. Civil Engineering and Architecture, 8(6), 1491-1496. DOI: 10.13189/cea.2020.080628. Copyright ©2020 by authors, all rights reserved. Authors agree that this article remains permanently open access under the terms of the Creative Commons Attribution License 4.0 International License Abstract Seismic clustering raises challenging questions concerning the nucleation process in regions marked by active faults. In this paper, we present a stochastic modeling approach to identify background and triggered seismicity in Northern Algeria. To perform the seismic clustering, we used the etasFLP package from the CRAN (Comprehensiv Archive Network) in R. The model was calibrated by testing and combining the FLP (Forward Likelihood Predictive) and ML(Maximum Likelihood) method for the non-parametric and the parametric parameters that describe the intensity function. On the whole, the results show that the greater contribution for events comes from the triggered earthquakes. The etasFLP package is suitable to describe the pattern for main shock and aftershocks sequences. Nevertheless, the discrepancies concern here the spatial distribution of the triggered events. In fact, the present modeling indicates the necessity to add, during the computation, additional terms for coefficients that represent external factors that influence the neighboring stress and would cause triggered events. More- over, a database with more events could provide an accurate modeling that would represent the distribution between the background and the triggered events. The Northern Algeria is the location for diverse source of tremors and therefore, there is a need to identify clearly man-made activities that might trigger seismic sequence. The present work aims at proposing the application of the ETAS model for such purpose. Keywords Earthquakes, Likelihood, Modeling, Northern Algeria, Induced Seismicity, Etasflp, Background Seismicity, Intensity Function 1 Introduction Seismic clustering helps to define whether an event is independant or triggered and generated by either aftershocks or the increase of the pore pressure due to the presence of fluids.The rupture mechanism for an active fault is related to the static stress condition within a fault system.The tectonic loading is known to be the main mechanism that determines a background seismicity. In this case, the earthquakes are independant. On the other hand, the stress transfer to the neighboring region after the main shock or the stress increases related to the pore fluid pressure when fluids are migrating within the cracks or the active fault determines the induced or triggered seismicity. Located between the converging Eurasian and African tectonic plates, the collision setting of Northern Algeria is prone to moderate to important and destructive earthquakes with magnitudes up to 7.5. Induced seismicity has already been identified as a potential source of a list of earthquakes in northern Algeria. Active faults related folds in the region (Chott El Hammam) have been mapped and considered potential locations for fluids migration related to hydrothermal springs [1]. On the 1st of January 1965, the Hodna plains were struck by a devastating earthquake, the largest event ever recorded and felt in the region at that time (Io= VIII (MSK); Ms=5.4) [2]. While describing the damage and the casualty distribution, Benouar [2] reported that a witness ”saw the sky red as a blaze”. He added that ”the atmosphere was smelling sulphur gas”. On February 1960, another earthquake hit the Melouza region (Beni-Ilmane) near the Djebel Choukchott (Io = VIII (MSK)) [2]. In addition to the reported damage and casualty distribu-