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  Earthquake Swarms, Slow Slip and Fault Interactions at the Western‐End of the Hellenic Subduction System Precede the Mw6.9 Zakynthos Earthquake, Greece

Mouslopoulou, V., Bocchini, G. M., Cesca, S., Saltogianni, V., Bedford, J., Petersen, G., Gianniou, M., Oncken, O. (2020): Earthquake Swarms, Slow Slip and Fault Interactions at the Western‐End of the Hellenic Subduction System Precede the Mw6.9 Zakynthos Earthquake, Greece. - Geochemistry Geophysics Geosystems (G3), 21, 12, e2020GC009243.
https://doi.org/10.1029/2020GC009243

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5004824 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5004824_5
Genre: Journal Article

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 Creators:
Mouslopoulou, V.1, Author
Bocchini, Gian Maria2, Author
Cesca, Simone2, Author              
Saltogianni, V3, Author              
Bedford, Jonathan4, Author              
Petersen, G.2, Author              
Gianniou, Michael5, Author
Oncken, O.4, Author              
Affiliations:
10 Pre-GFZ, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146023              
22.1 Physics of Earthquakes and Volcanoes, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146029              
31.1 Space Geodetic Techniques, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146025              
44.1 Lithosphere Dynamics, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146034              
5External Organizations, ou_persistent22              

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Free keywords: Hellenic subduction microseismicity plate‐interface slow slip events upper‐plate Zakynthos Earthquake
 Abstract: The month‐to‐year‐long deformation of the Earth's crust where active subduction zones terminate is poorly explored. Here we report on a multidisciplinary data set that captures the synergy of slow‐slip events, earthquake swarms and fault interactions during the ∼5 years leading up to the 2018 Mw 6.9 Zakynthos Earthquake at the western termination of the Hellenic Subduction System (HSS). It appears that this long‐lasting preparatory phase initiated due to a slow‐slip event that lasted ∼4 months and released strain equivalent to a ∼Mw 6.3 earthquake. We propose that the slow‐slip event, which is the first to be reported in the HSS, tectonically destabilized the upper 20–40 km of the crust, producing alternating phases of seismic and aseismic deformation, including intense microseismicity (Mw < 4) on neighboring faults, earthquake swarms in the epicentral area of the Mw 6.9 earthquake ∼1.5 years before the main event, another episode of slow slip immediately preceding the mainshock and, eventually, the large (Mw 6.9) Zakynthos Earthquake. Tectonic instability in the area is evidenced by a prolonged (∼4 years) period of overall suppressed b‐values (<1) and strong earthquake interactions on discrete strike‐slip, thrust and normal faults. We propose that composite faulting patterns accompanied by alternating (seismic/aseismic) deformation styles may characterize multifault subduction‐termination zones and may operate over a range of timescales (from individual earthquakes to millions of years).

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Language(s): eng - English
 Dates: 2020-12-142020
 Publication Status: Finally published
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: GFZPOF: p3 PT2 Plate Boundary Systems
DOI: 10.1029/2020GC009243
 Degree: -

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Title: Geochemistry Geophysics Geosystems (G3)
Source Genre: Journal, SCI, Scopus
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Pages: - Volume / Issue: 21 (12) Sequence Number: e2020GC009243 Start / End Page: - Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals159
Publisher: American Geophysical Union (AGU)