- 1National Research Institute of Astronomy and Geophysics (NRIAG), Egypt (essamgh@nriag.sci.eg)
- 2Istituto Nazionale di Geofisica e Vulcanologia (INGV), Rome, Italy (dedalo.marchetti@ingv.it)
- 3King Saud University, Riyadh, Saudi Arabia (mmetwaly@ksu.edu.sa)
In this study, we compared the results of multiparametric and multilayers investigations of three doublet earthquakes that occurred around the Arabian plate (M6.2 + M6.0 on 18 August 2014 close to Dehloran, Iran; M6.0 + M6.0 occurred on 15 July 2018 offshore Kilmia, Yemen and M6.0 + M6.0 occurred on 1 July 2022 close to Bandar-e Lengeh). We applied identical methods to the same dataset for all three cases. In particular, we investigated lithospheric, atmospheric, and ionospheric data six months before the three events. The lithosphere was investigated by calculating the cumulative Benioff strain with the USGS earthquake catalogue. Several atmospheric parameters (aerosol, SO2, CO, surface air temperature, surface latent heat flux humidity, and dimethyl sulphide) have been monitored using the homogeneous data from the MERRA-2 climatological archive. We used the three-satellite Swarm constellation for magnetic data, analysing the residuals after removing a geomagnetic model. All the cases present some patterns of anomalies, and when comparing them, we noticed some similarities but also differences. We pointed out that the released energy by the three events is very similar and occurred around the same plate. Still, they involved two different tectonic contexts (compressional on the Iranian side and extensional and transcurrent on the African Plate border). For the above reasons, their comparison is very interesting. Some similarities seem to be explainable in the tectonic context, and some are caused by the ocean's influence at the epicentre location. However, we also identified some differences that still require further investigation and comparison with other case studies.
Finally, this work can be considered a preliminary test of an extensive investigation and systematical search of LAIC patterns before the earthquake occurrences and the study of the possible influence of focal mechanism, location, geological factors, and other constraints.
References :
Ghamry Essam; Marchetti Dedalo; Metwaly Mohamed. Geophysical Coupling Before Three Earthquake Doublets Around the Arabian Plate. Atmosphere 2024, 15, 1318. https://doi.org/10.3390/atmos15111318
How to cite: Ghamry, E., Marchetti, D., and Metwaly, M.: Similarities and differences of the preparation of three (M≈6) earthquake doublets around the Arabian Plate, EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-5269, https://doi.org/10.5194/egusphere-egu25-5269, 2025.
