@article{fdi:010073045,
  title = {{G}lobal catalog of earthquake rupture velocities shows anticorrelation between stress drop and rupture velocity},
  author = {{C}hounet, {A}. and {V}all{\'e}e, {M}artin and {C}ausse, {M}. and {C}ourboulex, {F}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A}pplication of the {SCARDEC} method provides the apparent source time functions together with seismic moment, depth, and focal mechanism, for most of the recent earthquakes with magnitude larger than 5.6-6. {U}sing this large dataset, we have developed a method to systematically invert for the rupture direction and average rupture velocity {V}-r, when unilateral rupture propagation dominates. {T}he approach is applied to all the shallow (z < 120 km) earthquakes of the catalog over the 1992-2015 time period. {A}fter a careful validation process, rupture properties for a catalog of 96 earthquakes are obtained. {T}he subsequent analysis of this catalog provides several insights about the seismic rupture process. {W}e first report that up-dip ruptures are more abundant than down-dip ruptures for shallow subduction interface earthquakes, which can be understood as a consequence of the material contrast between the slab and the overriding crust. {R}upture velocities, which are searched without any a-priori up to the maximal {P} wave velocity (6000-8000 m/s), are found between 1200 m/s and 4500 m/s. {T}his observation indicates that no earthquakes propagate over long distances with rupture velocity approaching the {P} wave velocity. {A}mong the 23 ruptures faster than 3100 m/s, we observe both documented supershear ruptures (e.g. the 2001 {K}unlun earthquake), and undocumented ruptures that very likely include a supershear phase. {W}e also find that the correlation of {V}-r with the source duration scaled to the seismic moment ({T}-6) is very weak. {T}his directly implies that both {T}-6 and {V}-r are anticorrelated with the stress drop {A}ct. {T}his result has implications for the assessment of the peak ground acceleration ({PGA}) variability. {A}s shown by {C}ausse and {S}ong (2015), an anticorrelation between {D}elta sigma and {V}-r significantly reduces the predicted {PGA} variability, and brings it closer to the observed variability.},
  keywords = {{R}upture velocity ; {R}upture propagation ; {S}ource time functions ; {G}lobal earthquakes seismology ; {S}tress drop variability ; {P}eak {G}round ; {A}cceleration variability ; {MONDE}},
  booktitle = {},
  journal = {{T}ectonophysics},
  volume = {733},
  numero = {{SI}},
  pages = {148--158},
  ISSN = {0040-1951},
  year = {2018},
  DOI = {10.1016/j.tecto.2017.11.005},
  URL = {https://www.documentation.ird.fr/hor/fdi:010073045},
}