Relocation of the 8 September 2023 High Atlas, Morocco, Earthquake Aftershock Sequence

Bondár, István; Timoulali, Youssef; Chiang, Andrea; Hni, Lahcen; Kasmi, Mohamed

doi:10.1785/0120240100

Relocation of the 8 September 2023 High Atlas, Morocco, Earthquake Aftershock Sequence

Journal Article · Thu Oct 31 00:00:00 EDT 2024 · Bulletin of the Seismological Society of America

DOI:https://doi.org/10.1785/0120240100· OSTI ID:2530717

^[1]; Timoulali, Youssef ^[2]; ^[3]; Hni, Lahcen ^[2]; Kasmi, Mohamed ^[2]

Seismic Location Services, Lagos (Portugal)
Institut National de Géophysique, Rabat (Morocco)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

The earthquake that occurred on 8 September 2023, with a magnitude of 6.8, was the most destructive earthquake event in Morocco in the past decade. This earthquake took place in the Al Haouz region, located in the western part of the High Atlas Mountain range. To better understand what caused and triggered this earthquake, the earthquake catalogs including P and S arrival times were collected from the Moroccan seismic network and combined with regional data from the International Seismological Centre. The mainshock and aftershocks were relocated by using iLoc, a state-of-the-art single-event location algorithm, and then by the multiple event location double-difference algorithm, hypoDD. The improved earthquake relocations using iLoc and the double-difference methods provide sharper lineation of seismicity and agree well with tomographic images of the earthquake zone. Finally, the seismicity distribution and the focal mechanism of the mainshock indicate that the earthquake sequence has occurred along the South Atlas fault system.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 2530717

Report Number(s):: LLNL--JRNL-864789; 1098759

Journal Information:: Bulletin of the Seismological Society of America, Journal Name: Bulletin of the Seismological Society of America Journal Issue: 5 Vol. 115; ISSN 0037-1106

Publisher:: Seismological Society of AmericaCopyright Statement

Country of Publication:: United States

Language:: English

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58 GEOSCIENCES
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Relocation of the 8 September 2023 High Atlas, Morocco, Earthquake Aftershock Sequence

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