Revisiting the Laalam (Eastern Algeria) March 20, 2006 (Mw 5.1) Earthquake and its Seismotectonic Implication
| Autor: | Youcef Bouhadad, Farida Ousadou, Catherine Dorbath, L. Dorbath, Mourad Bezzeghoud, Khadidja Abbes |
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| Přispěvatelé: | Rabinovich, A., Braitenberg, C.F., Dmowska, R. |
| Rok vydání: | 2019 |
| Předmět: |
Earthquake engineering
Focal mechanism waveform inversion 010502 geochemistry & geophysics Strike-slip tectonics 01 natural sciences aftershocks focal mechanisms Shock (mechanics) lateral strike slip Stress drop Geophysics Geochemistry and Petrology Algeria Earthquakes Waveform inversion main shock Seismogram Seismology Geology Aftershock 0105 earth and related environmental sciences |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) Agência para a Sociedade do Conhecimento (UMIC)-FCT-Sociedade da Informação instacron:RCAAP |
| ISSN: | 1420-9136 0033-4553 |
| Popis: | Hypocenters of main shock and aftershocks of the March 20, 2006 Laalam earthquake are relocated using HypoDD double-difference technique. We combined accelerogram and seismogram data of the National Center of Applied Research in Earthquake Engineering (CGS). Among about 191 aftershocks, recorded at least by 4 stations, 141 aftershocks of Md 1.2–2.7 were relocated using HypoDD. The obtained swarm of epicenters occupying a crustal volume of 5 km × 3 km × 5 km and the focal mechanism corresponds to an unknown pure left lateral strike slip, trending N174°E. We were able to calculate focal mechanisms for only seven aftershocks with more than seven polarity readings, which give a P axis oriented NNW–SSE. The waveform inversion also provided values of Mw 5.1, M0 5.9 10−16 Nm and the depth 4.9 km. The dislocation and the stress drop were estimated to 90 cm and 16.5 bars, respectively. |
| Databáze: | OpenAIRE |
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