Preprint Article Version 1 This version is not peer-reviewed

Τhe February – March 2019 Seismic Swarm Offshore North Lefkada Island, Greece: Microseismicity Analysis and Geodynamic Implications

Version 1 : Received: 24 May 2020 / Approved: 25 May 2020 / Online: 25 May 2020 (16:47:35 CEST)

A peer-reviewed article of this Preprint also exists.

Kostoglou, A.; Karakostas, V.; Bountzis, P.; Papadimitriou, E. Τhe February–March 2019 Seismic Swarm Offshore North Lefkada Island, Greece: Microseismicity Analysis and Geodynamic Implications. Appl. Sci. 2020, 10, 4491. Kostoglou, A.; Karakostas, V.; Bountzis, P.; Papadimitriou, E. Τhe February–March 2019 Seismic Swarm Offshore North Lefkada Island, Greece: Microseismicity Analysis and Geodynamic Implications. Appl. Sci. 2020, 10, 4491.

Journal reference: Appl. Sci. 2020, 10, 4491
DOI: 10.3390/app10134491

Abstract

A quite energetic seismic excitation consisting of one main and additional three distinctive earthquake clusters that occurred in the transition area between the Kefalonia Transform Fault Zone (KTFZ) and the continental collision between Adriatic and Aegean microplates, is thoroughly studied after high–precision aftershocks’ relocation. The activated fault segments are in an area where historical and instrumental data have never claimed the occurrence of a catastrophic (M>6.0) earthquake. The relocated seismicity initially defines an activated structure extending from the northern segment of the Lefkada branch of KTFZ with the same NNE–SSW orientation and dextral strike-slip faulting and then keeping the same sense of motion its strike becomes NE–SW and its dip direction NW. This provides unprecedented information on the link between the KTFZ and the Collision front and sheds more light on the regional geodynamics. The earthquake catalog, which is specially compiled for this study, starts one year before the occurrence of the Mw5.4 mainshock and adequately provides the proper data source for investigating the temporal variation of the b–value, which might be used for discriminating foreshock and aftershock behavior.

Subject Areas

seismic swarm; relocated aftershocks; transition zone; b-value temporal variation; central Ionian Islands (Greece)

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