Abstract
In this work, we study the January 1, 2020 – June 8, 2021, earthquake activity in the East Corinth Rift (central Greece), one of the most seismically active areas in Europe. During this period an intense earthquake sequence occurred in the Perachora peninsula, presenting the characteristics of swarm activity. We present a relocated earthquake catalogue for the area, derived with the double-difference algorithm, and study the spatiotemporal evolution of the 2020 Perachora peninsula earthquake sequence and the possible triggering mechanisms. The Perachora sequence presents distinct characteristics of earthquake migration along a N 103º E direction, as indicated by the Principal Component Analysis, from the east toward northwest and then west, with successive deepening of the events. This migration pattern is compatible with a pore-fluid pressure triggering front of hydraulic diffusivity of D = 2.8 m2/s and an average velocity of 0.22 km/day. In addition, the sequence presents sub-diffusion, with a diffusion exponent of 0.89 ± 0.06. The analysis, overall, indicates that the Perachora sequence was triggered at shallow depths by fluid overpressures, possibly generated by down-going fluxes of meteoric fluids, and then driven by pore-fluid pressure diffusion along the activated structures.
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Data availability
Catalogue and arrival-time data for the seismicity in the region of the Eastern Gulf of Corinth were acquired from the databases of the Seismological Laboratory of the National and Kapodistrian University of Athens (SL-NKUA; www.geophysics.geol.uoa.gr/stations/gmapv3_db/index.php?lang=en, last accessed January 2022) and the Geodynamic Institute of the National Observatory of Athens (GI-NOA; https://bbnet.gein.noa.gr/HL/, last accessed January 2022). Focal mechanisms presented in maps and cross sections (Table 2 in Appendix) were collected from the databases of SL-NKUA, GI-NOA, the International Seismological Centre (http://www.isc.ac.uk/iscbulletin/search/fmechanisms/, last accessed January 2022) and the European and Mediterranean Seismological Centre (https://www.emsc-csem.org/Earthquake/tensors.php, last accessed January 2022). Waveform recordings of HUSN stations, used for cross-correlation measurements, were acquired from the European Integrated Data Archive (EIDA) node hosted at GI-NOA (http://eida.gein.noa.gr/webdc3/; Evangelidis et al. 2021). Precipitation data for the Loutraki meteorological station were obtained from the Institute of Environmental and Sustainable Development Research of NOA (http://meteosearch.meteo.gr/, last accessed January 2022).
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Acknowledgements
We would like to thank two anonymous reviewers and the Editor Ramon Zuñiga for their constructive comments that helped to improve the quality of this work. We would also like to thank the personnel of the Hellenic Unified Seismic Network (HUSN; http://eida.gein.noa.gr/) who contributed to the installation, operation and maintenance of HUSN stations and the routine analysis of seismological data used in the current article. The Generic Mapping Tools (GMT 5) software was used to plot some of the maps (Wessel et al. 2013). All other figures were created with MATLAB®.
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This study was supported by the Hellenic Foundation for Research and Innovation (H.F.R.I.) under the “2nd Call for H.F.R.I. Research Projects to support Post-Doctoral Researchers” (Project Number: 00256).
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Edited by Prof. Ramon Zuñiga (CO-EDITOR-IN-CHIEF).
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Michas, G., Kapetanidis, V., Spingos, I. et al. The 2020 Perachora peninsula earthquake sequence (Εast Corinth Rift, Greece): spatiotemporal evolution and implications for the triggering mechanism. Acta Geophys. 70, 2581–2601 (2022). https://doi.org/10.1007/s11600-022-00864-x
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DOI: https://doi.org/10.1007/s11600-022-00864-x