Some Preliminary Results on the Distribution of Aftershock Sequences in Japan-Kuril Islands and Kamchatka

Olasoglou, E.M.; Tsapanos, Theodoros M.; Papadimitriou, Eleftheria; Δρακάτος, Γ.

doi:10.12681/bgsg.11827

geosociety

2017

DOI: 10.12681/bgsg.11827

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Some Preliminary Results on the Distribution of Aftershock Sequences in Japan-Kuril Islands and Kamchatka

E.M. Olasoglou

Theodoros M. Tsapanos

Eleftheria Papadimitriou

et al.

Abstract: A study on the aftershock sequences distributed along the subductions in Japan and Kuril islands, as well as in

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2024

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The 2022–2023 seismic sequence onshore South Evia, central Greece: evidence for activation of a left-lateral strike-slip fault and regional triggering of seismicity

Serpetsidaki,

Ganas

2024

J Seismol

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On 29 November 2022, an earthquake of ML 5.0 (Mw 4.8) occurred onshore South Evia Island (central Greece) preceded by a ML 4.7 (Mw 4.6) event. The pattern of relocated aftershocks indicates the activation of a single, near-vertical fault segment, oriented NW-SE at shallow crustal depths (6–11 km). We suggest that both events ruptured a blind, left-lateral strike-slip fault, about 5 km southeast of village Almyropotamos. We observed that a clear foreshock activity (N=55 events) existed before the two moderate events. The impact of the static stress loading on neighboring fault planes diminishes after a distance of 7 km from the November 2022 epicenters, where the static stress falls below +0.1 bar. We further explore triggering relationships between the 29 November events and the late December 2022 moderate events (ML 4.9) that occurred about 60 km toward NW in the Psachna and Vlahia regions of central Evia. We present evidence of possible delayed dynamic triggering of the late December 2022 central Evia sequence, based on marked changes in seismicity rates and on measured peak ground velocities (PGVs) and peak dynamic strains, both exhibiting local maxima in their map distributions. The causes of the delayed triggering may be related to the well-known geothermal field in central/north Evia and the NW-SE strike of the seismic fault.

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The 2022–2023 seismic sequence onshore South Evia, central Greece: evidence for activation of a left-lateral strike-slip fault and regional triggering of seismicity

Serpetsidaki,

Ganas

2024

J Seismol

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Some Preliminary Results on the Distribution of Aftershock Sequences in Japan-Kuril Islands and Kamchatka

Abstract: A study on the aftershock sequences distributed along the subductions in Japan and Kuril islands, as well as in

Cited by 1 publication

References 28 publications

The 2022–2023 seismic sequence onshore South Evia, central Greece: evidence for activation of a left-lateral strike-slip fault and regional triggering of seismicity

The 2022–2023 seismic sequence onshore South Evia, central Greece: evidence for activation of a left-lateral strike-slip fault and regional triggering of seismicity

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