Seismicity along the Santorini-Amorgos zone and its relationship with active tectonics and fluid distribution

Andinisari, Ratri; Konstantinou, K. I.; Ranjan, P.

doi:10.1016/j.pepi.2021.106660

Cited by 5 publications

(17 citation statements)

References 52 publications

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“…For Vs velocities we created a 3D grid of identical dimensions as the 3D Vp grid and derived Vs velocities through a fixed Vp/Vs ratio of 1.77, which was estimated from a Wadati-diagram, included in Hensch (2009). This value is in agreement with the regional Vp/Vs values identified by Andinisari et al (2021a).…”

Section: Location Of Hypocentres With Nonlinloc Using a 3d Velocity M...supporting

confidence: 91%

“…11). Previous studies hypothesized a steady replenishment of this melt reservoir with mafic melts ascending from the mantle and infer this processes is linked to the persistent seismic unrest beneath Kolumbo (Andinisari et al, 2021a;Klaver et al, 2016;Konstantinou, 2020). We endorse this hypothesis and add further detail to it in the following paragraphs.…”

Section: Relations Of Earthquake Swarms and Fluidssupporting

confidence: 59%

“…A conceptual model of the Kolumbo magma plumbing system was developed by Konstantinou (2020) that infers a constant replenishment of the crustal magma chamber by melts ascending from the mantle. Andinisari et al (2021a) and Konstantinou (2020) hypothesize that the clustered seismicity at 5-16 km depth beneath Kolumbo reflects this replenishment. All these findings underline that Kolumbo is still in a phase of volcanic activity.…”

Section: Geological Setting Of Kolumbo and Eruption Historymentioning

confidence: 99%

“…Repeated clusters of local earthquakes underneath Kolumbo during the previous decades at depths of 5-20 km were interpreted as seismic unrest, related to the migration of magmatic fluids in and below the crustal magma chamber (Fig. 2; Andinisari et al, 2021a;Bohnhoff et al, 2006;Dimitriadis et al, 2009). The seismic unrest continues until today, and is recorded in the seismicity dataset of the National Observatory of Athens (https://bbnet.gein.noa.gr/HL/databases/database) from which we plot all events occurring in the Santorini-Kolumbo region during the recent two decades (Fig.…”

Section: Geological Setting Of Kolumbo and Eruption Historymentioning

confidence: 99%

“…During the past two decades the crust below Kolumbo has been characterized by persistent seismic unrest (Fig. 2; Andinisari et al, 2021a;Bohnhoff et al, 2006;Dimitriadis et al, 2010;Dimitriadis et al, 2009). The causes of this seismic unrest are still poorly understood and there is an ongoing debate about the potential of future eruptions at Kolumbo.…”

Section: Introductionmentioning

confidence: 99%

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Heralds of a Future Eruption? Swarms of Microseismicity beneath the submarine Kolumbo Volcano indicate Opening of near-vertical Fractures exploited by ascending Melts

Schmid¹,

Petersen²,

Hooft³

et al. 2022

Preprint

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The Kolumbo submarine volcano in the southern Aegean (Greece) is associated with repeated seismic unrest since at least two decades and the causes of this unrest are still hardly understood. We present a ten-month long microseismicity dataset for the period 2006-2007. The majority of earthquakes clusters in a cone-shaped portion of the crust below Kolumbo. The tip of this cone coincides with a low Vp-anomaly at 2-4 km depth, that is interpreted as a crustal melt reservoir. Our dataset includes several earthquake swarms, of which we analyse the four strongest in detail. The swarms occupy near-vertical volumes of the crust and together they form a zone of fracturing elongated in SW-NE direction, parallel to major regional faults. All four swarms show a general upward migration of hypocentres and the cracking front propagates unusually fast, compared to swarms in other volcanic areas. We conclude that the swarm seismicity is most likely triggered by a combination of pore-pressure perturbations and the re-distribution of elastic stresses. Fluid pressure perturbations are induced either by obstructions in the melt conduits in a rheologically strong layer between 6-9 km depth or by dynamic triggering from purely tectonic earthquakes. We conclude that the zone of fractures below Kolumbo is exploited by melts ascending from the mantle and filling the crustal melt reservoir. Together with the recurring seismic unrest, our study suggests that a future eruption is feasible and monitoring of the Kolumbo volcanic system is highly advisable.

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Section: Location Of Hypocentres With Nonlinloc Using a 3d Velocity M...supporting

confidence: 91%

Section: Relations Of Earthquake Swarms and Fluidssupporting

confidence: 59%

Section: Geological Setting Of Kolumbo and Eruption Historymentioning

confidence: 99%

Section: Geological Setting Of Kolumbo and Eruption Historymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Heralds of a Future Eruption? Swarms of Microseismicity beneath the submarine Kolumbo Volcano indicate Opening of near-vertical Fractures exploited by ascending Melts

Schmid¹,

Petersen²,

Hooft³

et al. 2022

Preprint

View full text Add to dashboard Cite

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Moment tensor inversion of microearthquakes along the Santorini-Amorgos zone: Tensile faulting and emerging volcanism in an extensional setting

Andinisari

Konstantinou

Ranjan

2021

Journal of Volcanology and Geothermal Research

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Heralds of Future Volcanism: Swarms of Microseismicity Beneath the Submarine Kolumbo Volcano Indicate Opening of Near‐Vertical Fractures Exploited by Ascending Melts

Schmid

Petersen

Hooft

et al. 2022

Geochem Geophys Geosyst

View full text Add to dashboard Cite

The Kolumbo submarine volcano in the southern Aegean (Greece) is associated with repeated seismic unrest since at least two decades and the causes of this unrest are poorly understood. We present a ten‐month long microseismicity data set for the period 2006–2007. The majority of earthquakes cluster in a cone‐shaped portion of the crust below Kolumbo. The tip of this cone coincides with a low Vp‐anomaly at 2–4 km depth, which is interpreted as a crustal melt reservoir. Our data set includes several earthquake swarms, of which we analyze the four with the highest events numbers in detail. Together the swarms form a zone of fracturing elongated in the SW‐NE direction, parallel to major regional faults. All four swarms show a general upward migration of hypocenters and the cracking front propagates unusually fast, compared to swarms in other volcanic areas. We conclude that the swarm seismicity is most likely triggered by a combination of pore‐pressure perturbations and the re‐distribution of elastic stresses. Fluid pressure perturbations are induced likely by obstructions in the melt conduits in a rheologically strong layer between 6 and 9 km depth. We conclude that the zone of fractures below Kolumbo is exploited by melts ascending from the mantle and filling the crustal melt reservoir. Together with the recurring seismic unrest, our study suggests that a future eruption is probable and monitoring of the Kolumbo volcanic system is highly advisable.

show abstract

Seismicity along the Santorini-Amorgos zone and its relationship with active tectonics and fluid distribution

Cited by 5 publications

References 52 publications

Heralds of a Future Eruption? Swarms of Microseismicity beneath the submarine Kolumbo Volcano indicate Opening of near-vertical Fractures exploited by ascending Melts

Heralds of a Future Eruption? Swarms of Microseismicity beneath the submarine Kolumbo Volcano indicate Opening of near-vertical Fractures exploited by ascending Melts

Moment tensor inversion of microearthquakes along the Santorini-Amorgos zone: Tensile faulting and emerging volcanism in an extensional setting

Heralds of Future Volcanism: Swarms of Microseismicity Beneath the Submarine Kolumbo Volcano Indicate Opening of Near‐Vertical Fractures Exploited by Ascending Melts

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