Spatio-temporal analysis of main seismic hazard parameters in the Ibero-Maghreb region using an Mw homogenized catalog

Mobarki, Mourad; Talbi, Abdelhak

doi:10.1007/s11600-022-00768-w

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Tytuł artykułu

Spatio-temporal analysis of main seismic hazard parameters in the Ibero-Maghreb region using an Mw homogenized catalog

Autorzy

Mobarki Mourad , Talbi Abdelhak

Wybrane pełne teksty z tego czasopisma

https://www.springer.com/journal/11600

Identyfikatory

DOI

10.1007/s11600-022-00768-w

Warianty tytułu

Języki publikacji

Abstrakty

As a step toward probabilistic seismic hazard assessment in the Ibero–Maghreb region, this study focuses on the estimation and the analysis of main seismic hazard parameters, namely the magnitude of completeness mc, the occurrence rate λ, the Gutenberg–Richter b value, and the maximum expected magnitude Mmax. The most recent earthquake catalog database has been compiled using different earthquake sources, including historical and instrumental earthquake records covering the time period 1045−2019. International Seismological Centre catalog database has been used to get the preliminary instrumental catalog covering the study region. Then, a magnitude inter-scale conversion analysis has been carried out to obtain magnitude conversion empirical laws. These later have been used to compile a homogenized catalog with all magnitudes unified to the moment magnitude Mw scale, which is quite reliably linked to fault physical parameters. The completeness magnitude has been estimated for different time periods using the maximum curvature and the entire magnitude range methods. Subsequently, the spatio-temporal variation of the completeness magnitude has been studied to better appreciate regional data quality. This analysis resulted in three complete sub-catalogs corresponding to different magnitude of completeness, namely mc=3.5, 4.5, and 5.5, starting from 1997, 1967 and 1959. The remaining seismic hazard parameters (λ, b and Mmax) were analyzed taking into account former magnitudes of completeness. Indeed, the use of incomplete data may add significant bias to seismic hazard parameters estimates. Main results are presented as spatial maps showing variation of seismic hazard parameters for different mc values. In particular, for the first time, a combined maximum magnitude–intensity map is elaborated and analyzed. The region corresponding to the largest maximum possible magnitude Mmax has been delimited as including Chelif basin and its surrounding areas west of the capital city Algiers. Mmax hotspots with values exceeding 7 have been delimitated close to Lakhdaria and Boumerdes cities east of the capital Algiers. The corresponding hotspots include the epicenter of the 1910 Mw7 and the 2003 Mw6.8 Aumale and Zemmouri earthquakes, respectively. The magnitude of completeness mc has been found to decrease significantly during the last two decades, especially in the western part. The results obtained in this study can serve as a road map for future seismic hazard studies performed on the Ibero–Maghreb region.

Słowa kluczowe

earthquake hazard spatial analysis probability distributions earthquake dynamics hotspots

zagrożenie trzęsieniem ziemi analiza przestrzenna rozkłady prawdopodobieństwa dynamika trzęsienia ziemi

Wydawca

Instytut Geofizyki PAN
Springer

Czasopismo

Acta Geophysica

Rocznik

2022

Tom

Vol. 70, no 3

Strony

979--1001

Opis fizyczny

Bibliogr. 107 poz.

Twórcy

autor

Mobarki Mourad

mourad.mobarki@gmail.com

Centre de Recherche en Astronomie Astrophysique et Géophysique, CRAAG, BP 63, 16340 Bouzareah, Algeria
Faculté des Sciences de la Terre, de la Géographie et de l’Aménagement du Territoire (FSTGAT), Université des Sciences et de la Technologie Houari Boumediene, Bab Ezzouar, Algiers, Algeria

autor

Talbi Abdelhak

Centre de Recherche en Astronomie Astrophysique et Géophysique, CRAAG, BP 63, 16340 Bouzareah, Algeria

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).

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Bibliografia

Identyfikator YADDA

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