Earthquake supercycles in Central Italy, inferred from 36Cl exposure dating - Archive ouverte HAL Access content directly
Journal Articles Earth and Planetary Science Letters Year : 2011

Earthquake supercycles in Central Italy, inferred from 36Cl exposure dating

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Abstract

We use 36Cl surface exposure dating to determine the slip release pattern over the last ~ 15 kyr for the Velino-Magnola fault, a major active normal fault in Central Italy. We sampled the fault at five well-separated sites along its length, and modeled the 36Cl concentrations measured in the 376 samples. We find that the fault broke in at least 9 large earthquakes that occurred in two 5-6 ka-long supercycles. Each cycle included a 4-5 ka-long phase of relative quiescence, followed by a cluster of at least 3 large earthquakes or earthquake sequences that released most of the accumulated strain in ~ 1 ka. All 9 identified events broke the entire fault and produced maximum surface slips of 2-3 m. Though the Velino-Magnola fault seems presently in a stage of relative quiescence, it may re-enter a phase of paroxysmal seismic activity in a few hundred of years
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Dates and versions

hal-00667280 , version 1 (07-02-2012)

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Aloe Schlagenhauf, I. Manighetti, L Benedetti, Y. Gaudemer, R. Finkel, et al.. Earthquake supercycles in Central Italy, inferred from 36Cl exposure dating. Earth and Planetary Science Letters, 2011, 307 (3-4), pp.487-500. ⟨10.1016/j.epsl.2011.05.022⟩. ⟨hal-00667280⟩
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