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

Schmid, F.; Petersen, G.; Hooft, E.; Paulatto, M.; Chrapkiewicz, K.; Hensch, M.; Dahm, T.

doi:10.1029/2022GC010420

Item

ITEM ACTIONSEXPORT

Add to Basket

Local TagsRelease HistoryDetailsSummary

Released

Journal Article

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

Authors

Schmid, F.
External Organizations;

/persons/resource/gesap

Petersen, G.
2.1 Physics of Earthquakes and Volcanoes, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Hooft, E.
External Organizations;

Paulatto, M.
External Organizations;

Chrapkiewicz, K.
External Organizations;

Hensch, M.
External Organizations;

/persons/resource/dahm

Dahm, T.
2.1 Physics of Earthquakes and Volcanoes, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

External Ressource

No external resources are shared

Fulltext (public)

5013471.pdf
(Publisher version), 5MB

Supplementary Material (public)

There is no public supplementary material available

Citation

Schmid, F., Petersen, G., Hooft, E., Paulatto, M., Chrapkiewicz, K., Hensch, M., Dahm, T. (2022): Heralds of Future Volcanism: Swarms of Microseismicity Beneath the Submarine Kolumbo Volcano Indicate Opening of Near‐Vertical Fractures Exploited by Ascending Melts. - Geochemistry Geophysics Geosystems (G3), 23, 7, e2022GC010420.
https://doi.org/10.1029/2022GC010420

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5013471

Abstract

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.