@article{fdi:010086993,
  title = {{S}patio-temporal evolution of aftershock and repeater source properties after the 2016 {P}edernales {E}arthquake ({E}cuador)},
  author = {{C}halumeau, {C}. and {A}gurto-{D}etzel, {H}. and {D}e {B}arros, {L}. and {C}harvis, {P}hilippe and {R}apid {R}esponse {T}eam of the 2016 {P}edernales {E}arthquake,},
  editor = {},
  language = {{ENG}},
  abstract = {{S}ubduction zones are highly heterogeneous regions capable of hosting large earthquakes. {T}o better constrain the processes at depth, we analyze the source properties of 1514 aftershocks of the 16th {A}pril 2016 {M}-w 7.8 {P}edernales earthquake ({E}cuador) using spectral ratios. {W}e are able to retrieve accurate seismic moments, stress drops, and {P} and {S} corner frequencies for 341 aftershocks, including 136 events belonging to families of repeating earthquakes. {W}e find that, for the studied magnitude range ({M}-w 2-4), stress drops appear to increase as a function of seismic moment. {T}hey are also found to depend on their distance to the trench. {T}his is in part explained by the increase in depth, and therefore normal stress, away from the trench. {H}owever, even accounting for the shallow depths of earthquakes, stress drops appear to be anomalously low near the trench, which can be explained by a high pore fluid pressure or by inherent properties of the medium (low coefficient of friction/low rigidity of the medium) in that region. {W}e are also able to examine the temporal evolution of source properties thanks to the presence of repeating earthquakes. {W}e find that the variations of source properties within repeating earthquake families are not uniform, and are highly spatially variable over most of the study area. {T}his is not the case near the trench, however, where stress drops systematically decrease over time. {W}e suggest that this reflects an increase in pore fluid pressure near the trench over the postseismic period.},
  keywords = {stress drop ; spectral ratios ; {P}edernales ; subduction ; repeating ; earthquakes ; postseismic processes ; {EQUATEUR}},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch : {S}olid {E}arth},
  volume = {128},
  numero = {2},
  pages = {e2022{JB}025353 [19 p.]},
  ISSN = {2169-9313},
  year = {2023},
  DOI = {10.1029/2022jb025353},
  URL = {https://www.documentation.ird.fr/hor/fdi:010086993},
}