@article{fdi:010071390,
  title = {{C}omparison of observed ground-motion attenuation for the 16 {A}pril 2016 {M}-w 7.8 {E}cuador megathrust earthquake and its two largest aftershocks with existing ground-motion prediction equations},
  author = {{B}eauval, {C}{\'e}line and {M}arini{\`e}re, {J}udith and {L}aurendeau, {A}. and {S}ingaucho, {J}. {C}. and {V}iracucha, {C}. and {V}all{\'e}e, {M}artin and {M}aufroy, {E}. and {M}ercerat, {D}. and {Y}epes, {H}. and {R}uiz, {M}. and {A}lvarado, {A}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A} megathrust subduction earthquake ({M}-w 7.8) struck the coast of {E}cuador on 16 {A}pril 2016 at 23:58 {UTC}. {T}his earthquake is one of the best-recorded megathrust events to date. {B}esides the mainshock, two large aftershocks have been recorded on 18 {M}ay 2016 at 7:57 ({M}-w 6.7) and 16:46 ({M}-w 6.9). {T}hese data make a significant contribution for understanding the attenuation of ground motions in {E}cuador. {P}eak ground accelerations and spectral accelerations are compared with four ground-motion prediction equations ({GMPE}s) developed for interface earthquakes, the global {A}brahamson et al. (2016) model, the {J}apanese equations by {Z}hao, {Z}hang, et al. (2006) and {G}hofrani and {A}tkinson (2014), and one {C}hilean equation ({M}ontalva et al., 2017). {T}he four tested {GMPE}s are providing rather close predictions for the mainshock at distances up to 200 km. {H}owever, our results show that high-frequency attenuation is greater for back-arc sites, thus {Z}hao, {Z}hang, et al. (2006) and {M}ontalva et al. (2017), who are not taking into account this difference, are not considered further. {R}esidual analyses show that {G}hofrani and {A}tkinson (2014) and {A}brahamson et al. (2016) are well predicting the attenuation of ground motions for the mainshock. {C}omparisons of aftershock observations with the predictions from {A}brahamson et al. (2016) indicate that the {GMPE} provide reasonable fit to the attenuation rates observed. {T}he event terms of the {M}-w 6.7 and 6.9 events are positive but within the expected scatter from worldwide similar earthquakes. {T}he intraevent standard deviations are higher than the intraevent variability of the model, which is partly related to the poorly constrained {V}-{S}30 proxies. {T}he {P}edernales earthquake produced a large sequence of aftershocks, with at least nine events with magnitude higher or equal to 6.0. {I}mportant cities are located at short distances (20-30 km), and magnitudes down to 6.0 must be included in seismic-hazard studies. {T}he next step will be to constitute a strong-motion interface database and test the {GMPE}s with more quantitative methods.},
  keywords = {{EQUATEUR}},
  booktitle = {},
  journal = {{S}eismological {R}esearch {L}etters},
  volume = {88},
  numero = {2},
  pages = {287--299},
  ISSN = {0895-0695},
  year = {2017},
  DOI = {10.1785/0220160150},
  URL = {https://www.documentation.ird.fr/hor/fdi:010071390},
}