Earthquake supercycles in Central Italy, inferred from (36)Cl exposure dating | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

Twitter

Aller au compte twitter

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

Type de publication:

Journal Article

Source:

Earth and Planetary Science Letters, Volume 307, Ticket 3-4, p.487-500 (2011)

ISBN:

0012-821X

Numéro d'accès:

WOS:000293258300026

URL:

http://www.sciencedirect.com/science/article/pii/S0012821X11003050

Mots-clés:

UMR 7154 ; Tectonique et Mécanique de la Lithosphère ; past earthquakes;earthquake clustering; 36Cl cosmogenic exposure dating; normal fault; azio–Abruzzo (Central Italy)

Résumé:

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.

Notes:

Times Cited: 0