Nocquet J. M. auteur aut IRD Jarrin P. auteur aut IRD Vallée M. auteur aut IRD Mothes P. A. auteur aut IRD Grandin R. auteur aut IRD Rolandone Frédérique auteur aut IRD Delouis B. auteur aut IRD Yepes H. auteur aut IRD Font Yvonne auteur aut IRD Fuentes D. auteur aut IRD Régnier Marc auteur aut IRD Laurendeau A. auteur aut IRD Cisneros D. auteur aut IRD Hernandez S. auteur aut IRD Sladen A. auteur aut IRD Singaucho J. C. auteur aut IRD Mora H. auteur aut IRD Gomez J. auteur aut IRD Montes L. auteur aut IRD Charvis Philippe auteur aut IRD text journalArticle eng text/pdf born digital access Large earthquakes are usually assumed to release all of the strain accumulated since the previous event, implying a reduced seismic hazard after them. However, long records of seismic history at several subduction zones suggest supercycle behaviour, where centuries-long accumulated strain is released through clustered large earthquakes, resulting in an extended period of enhanced seismic hazard. Here we combine historical seismology results, present-day geodesy data, and dense local observations of the recent M-w 7.8 2016 Pedernales earthquake to reconstruct the strain budget at the Ecuador subduction zone since the great 1906 earthquake. We show that the Pedernales earthquake involved the successive rupture of two patches on the plate interface that were locked prior to the earthquake and most probably overlaps the area already ruptured in 1942 by a similar earthquake. However, we find that coseismic slip in 2016 exceeds the deficit accumulated since 1942. The seismic moment of every large earthquake during the twentieth century further exceeds the moment deficit accumulated since 1906. These results, together with the seismic quiescence before 1906 highlighted by historical records and marine palaeoseismology, argue for an earthquake supercycle at the Ecuador-Colombia margin. This behaviour, which has led to an enhanced seismic hazard for 110 years, is possibly still going on and may apply to other subduction zones that recently experienced a great earthquake. specialized EQUATEUR COLOMBIE 066 10 2 145-149 +3 p. 2017 1752-0894 https://www.documentation.ird.fr/hor/fdi:010069282 10.1038/ngeo2864 1752-0894 [F B010069282] https://www.documentation.ird.fr/hor/fdi:010069282 https://www.documentation.ird.fr/intranet/publi/2017/03/010069282.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2017-04-04 2023-07-11 fdi:010069282 fre