@article{fdi:010067646,
  title = {{S}tress-drop variability of shallow earthquakes extracted from a global database of source time functions},
  author = {{C}ourboulex, {F}. and {V}all{\'e}e, {M}artin and {C}ausse, {M}. and {C}hounet, {A}.},
  editor = {},
  language = {{ENG}},
  abstract = {{W}e use the new global database of source time functions ({STF}s) and focal mechanisms proposed by {V}allee (2013) using the automatic {SCARDEC} method ({V}allee et al., 2011) to constrain earthquake rupture duration and variability. {T}his database has the advantage of being very consistent since all the events with moment magnitudes {M}-w > 5.8 that have occurred during the last 20 years were reanalyzed with the same method and the same station configuration. {W}e analyze 1754 shallow earthquakes (depth < 35 km) and use high-quality criteria for the {STF}s, which result in the selection of 660 events. {A}mong these, 313 occurred on the subduction interface ({SUB} events) and 347 outside ({NOT}-{SUB} events). {W}e obtain that for a given magnitude, {STF} duration is log normally distributed and that {STF}s are longer for {SUB} than {NOT}-{SUB} events. {W}e then estimate the stress drop using a proxy for the rupture process duration obtained from the measurement of the maximum amplitude of the {STF}. {T}he resulting stress drop is independent of magnitude and is about 2.5 times smaller for the subduction events compared with the other events. {A}ssuming a constant rupture velocity and source model, the resulting standard deviation of the stress drop is 1.13 for the total dataset (natural log), and about 1 for separate datasets. {T}hese values are significantly lower than the ones generally obtained from corner-frequency analyses with global databases (similar to 1.5 for {A}llmann and {S}hearer, 2009) and are closer to the values inferred from strong-motion measurements (similar to 0.5 as reported by {C}otton et al., 2013). {T}his indicates that the epistemic variability is reduced by the use of {STF} properties, which allows us to better approach the natural variability of the source process, related to stress-drop variability and/or variation in the rupture velocity.},
  keywords = {},
  booktitle = {},
  journal = {{S}eismological {R}esearch {L}etters},
  volume = {84},
  numero = {4},
  pages = {912--918},
  ISSN = {0895-0695},
  year = {2016},
  DOI = {10.1785/0220150283},
  URL = {https://www.documentation.ird.fr/hor/fdi:010067646},
}