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Halpaap, Felix; Rondenay, Stéphane; Perrin, Alexander; Goes, Saskia; Ottemöller, Lars; Austrheim, Håkon; Shaw, Robert; Eeken, Thomas (2018): Western Hellenic Subduction Zone: deep earthquake activity 2000 - 2017, plate interface geometry and thermal model. PANGAEA,, Supplement to: Halpaap, F et al. (2019): Earthquakes track subduction fluids from slab source to mantle wedge sink. Science Advances, 5,

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Subducting rocks release fluids as they plunge into Earth's mantle, and occasionally rupture to produce intraslab earthquakes. It is debated, however, whether fluids and earthquakes are directly related. By combining seismic observations and geodynamic models from western Greece, and comparing across other subduction zones, we find that earthquakes effectively track the flow of fluids from their slab source at >80 km depth to their sink at shallow (<40 km) depth. Between source and sink, the fluids flow updip under a sealed interface, facilitating intraslab earthquakes. In some locations, the seal breaks and fluids escape through vents into the mantle wedge, thereby reducing the fluid supply and seismicity updip in the slab. The vents themselves may represent nucleation sites for larger damaging earthquakes.
Median Latitude: 37.963601 * Median Longitude: 22.571175 * South-bound Latitude: 35.953090 * West-bound Longitude: 19.593240 * North-bound Latitude: 40.605010 * East-bound Longitude: 25.398580
Date/Time Start: 2000-03-09T00:00:00 * Date/Time End: 2018-01-19T21:24:07
Hellenic_Volcanic_Arc * Latitude: 37.633330 * Longitude: 23.366670 * Date/Time Start: 2000-03-09T00:00:00 * Date/Time End: 2018-01-19T00:00:00
Here we provide observations of deep earthquakes in the Western Hellenic Subduction Zone, a model of the top of the slab and a corresponding two-dimensional model of the subduction zone's thermal structure. Seismic observations include hypocenter locations with arrival time picks of 2172 events based on several temporary and permanent deployments, and focal mechanisms for 85 of these events. The complete earthquake dataset including picks is available in the Nordic and QuakeML formats, while the hypocenter and focal mechanisms solutions are also listed in tables. The models of slab top and thermal structure are available in netCDF format.
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