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Cumulative long and mid-term slip rates on the Helike and Aigion faults

Contribution to these estimates derives from different approaches:

- Translation of the footwall uplift rates to fault slip rates by using dislocation models by applying fault parameters based on WP8 fault mapping. A code based on standard (elastic half-space) dislocation theory (Ward and Valensise, 1989) was used because it provided the most conservative results always representing the maximum slip rates for the modelled fault.

The long-term slip rate (over the past 2-300kyr) for each fault segment, obtained assuming a regional uplift rate of 0.2mm/yr was:
-- East Eliki Fault 7-9mm/yr.
-- West Eliki Fault 9-11mm/yr.
-- Aigion Fault 9-11mm/yr.

- Translation the vertical slip rate, measured on the trench walls, to slip rate on the fault plane, assuming an average fault dip of 50°, consistent for all the faults. The obtained mid-term slip rates (over the past 2-3000yr) for the two fault segments (where data is available) are:
-- East Eliki Fault 1.7-6.0mm/yr.
-- Aigion Fault 1.2-6.4mm/yr.

- Translation of the vertical separation rates obtained from correlative deposits dated at about 30kyr across the Aigion fault (from the 200m deep well cored in Aigion harbour and an outcrop on the Aigion footwall) to slip on a 50°-dipping fault by simple trigonometric rules. This suggests a ca. 5.2-5.5mm/yr slip rate for the Aigion fault.

Related information

Reported by

Istituto Nazionale di Geofisica
Via Vigna Murata 605
00143 Rome
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