Earthquake-swarms, slow-slip and fault-interactions at the western-end of the Hellenic Subduction System precede the Mw 6.9 Zakynthos Earthquake, Greece

Mouslopoulou, Vasiliki; Bocchini, Gian Maria; Cesca, Simone; Saltogianni, Vasso; Bedford, Jonathan; Petersen, Gesa; Gianniou, Michael; Oncken, Onno

doi:10.1002/essoar.10503389.1

Cited by 6 publications

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“…Very recently, Mouslopoulou et al. (2020) reported two SSEs beneath the western coast of Peloponnese south of Zakynthos (Figure S1b). Approximately two months of plate motion acceleration preceded both SSEs.…”

Section: Plate Boundaries and Fault Systems In The Central‐eastern Mementioning

confidence: 88%

“…Very recently SSEs have been found at the down‐dip limit of the seismogenic zone, at depths of 20–40 km beneath western Peloponnese (Mouslopoulou et al., 2020) leaving open the possibility that they occur along other segments of the Hellenic Subduction Zone (Saltogianni et al., 2020). Limitations on publicly available geodetic data may have prevented their detection elsewhere.…”

Section: Discussionmentioning

confidence: 99%

“…(2020), while the network configuration and ambient noise level would have potentially missed tremor‐like signals during the 2018 SSE. However, due the high similarity of the duration, location, and released seismic moment of the 2014–2015 and the 2018 SSEs (Mouslopoulou et al., 2020) it is possible that the absence of vigorous tremor episodes is common to both the SSEs.…”

Section: Discussionmentioning

confidence: 99%

“…Approximately two months of plate motion acceleration preceded both SSEs. Each geodetic transient related to the SSEs lasted for ∼5–6 months (i.e., September 24, 2014 to March 20, 2015 and May 14, 2018 to October 25, 2018) and likely occurred between 20 and 40 km depth along the plate interface (Mouslopoulou et al., 2020).…”

Section: Plate Boundaries and Fault Systems In The Central‐eastern Mementioning

confidence: 99%

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Does Deep Tectonic Tremor Occur in the Central‐Eastern Mediterranean Basin?

et al. 2021

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Section: Plate Boundaries and Fault Systems In The Central‐eastern Mementioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Plate Boundaries and Fault Systems In The Central‐eastern Mementioning

confidence: 99%

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Does Deep Tectonic Tremor Occur in the Central‐Eastern Mediterranean Basin?

et al. 2021

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“…In this study we apply the clustering toolbox to the aftershock sequence of the 25 October 2018 M w 6.9 Zakynthos (Greece) earthquake (Chousianitis & Konca 2019;Cirella et al 2020;Ganas et al 2020;Karakostas et al 2020;Mouslopoulou et al 2020;Sokos et al 2020). The data set includes >2300 events with M ≥ 2.8 recorded at 33 stations from 25/10/2018 to 14/11/2019.…”

Section: Introductionmentioning

confidence: 99%

Clusty, the waveform-based network similarity clustering toolbox: concept and application to image complex faulting offshore Zakynthos (Greece)

Petersen

Niemz

Cesca

et al. 2020

Geophysical Journal International

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Summary Clusty is a new open source toolbox dedicated to earthquake clustering based on waveforms recorded across a network of seismic stations. Its main application is the study of active faults and the detection and characterization of faults and fault networks. By using a density-based clustering approach, earthquakes pertaining to a common fault can be recognised even over long fault segments, and the first-order geometry and extent of active faults can be inferred. Clusty implements multiple techniques to compute a waveform based network similarity from maximum cross-correlation coefficients at multiple stations. The clustering procedure is designed to be transparent and parameters can be easily tuned. It is supported by a number of analysis visualisation tools which help to assess the homogeneity within each cluster and the differences among distinct clusters. The toolbox returns graphical representations of the results. A list of representative events and stacked waveforms facilitate further analyses like moment tensor inversion. Results obtained in various frequency bands can be combined to account for large magnitude ranges. Thanks to the simple configuration, the toolbox is easily adaptable to new datasets and to large magnitude ranges. To show the potential of our new toolbox, we apply Clusty to the aftershock sequence of the Mw 6.9 October 25, 2018 Zakynthos (Greece) Earthquake. Thanks to the complex tectonic setting at the western termination of the Hellenic Subduction System where multiple faults and faulting styles operate simultaneously, the Zakynthos dataset provides an ideal case-study for our clustering analysis toolbox. Our results support the activation of several faults and provide insight into the geometry of faults or fault segments. We identify two large thrust faulting clusters in the vicinity of the mainshock and multiple strike-slip clusters to the east, west and south of these clusters. Despite its location within the largest thrust cluster, the mainshock does not show a high waveform similarity to any of the clusters. This is consistent with the results of other studies suggesting a complex failure mechanism for the mainshock. We propose the existence of conjugated strike-slip faults in the south of the study area. Our waveform similarity based clustering toolbox is able to reveal distinct event clusters which cannot be discriminated based on locations and/or timing only. Additionally, the clustering results allows distinction between fault and auxiliary planes of focal mechanisms and to associate them to known active faults.

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Slow Slip Triggers the 2018 M_w 6.9 Zakynthos Earthquake Within the Weakly Locked Hellenic Subduction System, Greece

Saltogianni

Mouslopoulou

Dielforder

et al. 2021

Geochem Geophys Geosyst

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Earthquake-swarms, slow-slip and fault-interactions at the western-end of the Hellenic Subduction System precede the Mw 6.9 Zakynthos Earthquake, Greece

Cited by 6 publications

References 0 publications

Does Deep Tectonic Tremor Occur in the Central‐Eastern Mediterranean Basin?

Does Deep Tectonic Tremor Occur in the Central‐Eastern Mediterranean Basin?

Clusty, the waveform-based network similarity clustering toolbox: concept and application to image complex faulting offshore Zakynthos (Greece)

Slow Slip Triggers the 2018 M_w 6.9 Zakynthos Earthquake Within the Weakly Locked Hellenic Subduction System, Greece

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Earthquake-swarms, slow-slip and fault-interactions at the western-end of the Hellenic Subduction System precede the Mw 6.9 Zakynthos Earthquake, Greece

Cited by 6 publications

References 0 publications

Does Deep Tectonic Tremor Occur in the Central‐Eastern Mediterranean Basin?

Does Deep Tectonic Tremor Occur in the Central‐Eastern Mediterranean Basin?

Clusty, the waveform-based network similarity clustering toolbox: concept and application to image complex faulting offshore Zakynthos (Greece)

Slow Slip Triggers the 2018 Mw 6.9 Zakynthos Earthquake Within the Weakly Locked Hellenic Subduction System, Greece

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Slow Slip Triggers the 2018 M_w 6.9 Zakynthos Earthquake Within the Weakly Locked Hellenic Subduction System, Greece