@article{fdi:010066271,
  title = {{E}arthquake relocation using a 3{D} a-priori geological velocity model from the western {A}lps to {C}orsica : implication for seismic hazard},
  author = {{B}ethoux, {N}. and {T}heunissen, {T}. and {B}eslier, {M}. {O}. and {F}ont, {Y}vonne and {T}houvenot, {F}. and {D}essa, {J}. {X}. and {S}imon, {S}. and {C}ourrioux, {G}. and {G}uillen, {A}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he region between the inner zones of the {A}lps and {C}orsica juxtaposes an overthickened crust to an oceanic domain, which makes difficult to ascertain the focal depth of seismic events using routine location codes and average 1{D} velocity models. {T}he aim of this article is to show that, even with a rather lose monitoring network, accurate routine locations can be achieved by using realistic 3{D} modelling and advanced location techniques. {P}revious earthquake tomography studies cover the whole region with spatial resolutions of several tens of kilometres on land, but they fail to resolve the marine domain due to the absence of station coverage and sparse seismicity. {T}o overcome these limitations, we first construct a 3{D} a-priori {P} and {S} velocity model integrating known geophysical and geological information. {S}ignificant progress has been achieved in the 3{D} numerical modelling of complex geological structures by the development of dedicated softwares (e.g. 3{D} {G}eo{M}odeller), capable at once of elaborating a 3{D} structural model from geological and geophysical constraints and, possibly, of refining it by inversion processes ({C}alcagno et al., 2008). {T}hen, we build an arrival-time catalogue of 1500 events recorded from 2000 to 2011. {H}ypocentres are then located in this model using a numerical code based on the maximum intersection method ({F}ont et al., 2004), updated by {T}heunissen et al. (2012), as well as another 3{D} location technique, the {N}on{L}in{L}oc software ({L}omax and {C}urtis, 2001). {T}he reduction of arrival-time residuals and uncertainties (dh, dz) with respect to classical 1{D} locations demonstrates the improved accuracy allowed by our approach and confirms the coherence of the 3{D} geological model built and used in this study. {O}ur results are also compared with previous works that benefitted from the installation of dense temporary networks surrounding the studied epicentre area. {T}he resulting 3{D} location catalogue allows us to improve the regional seismic hazard assessment, more particularly in the south of the {A}rgentera massif and in the {L}igurian basin.},
  keywords = {3-{D} modelling of crustal geometry ; 3-{D} earthquake location ; {A}lps and {L}igurian {S}ea ; {A}ctive tectonics ; {FRANCE} ; {ITALIE} ; {MEDITERRANEE} ; {ALPES} ; {CORSE}},
  booktitle = {},
  journal = {{T}ectonophysics},
  volume = {670},
  numero = {},
  pages = {82--100},
  ISSN = {0040-1951},
  year = {2016},
  DOI = {10.1016/j.tecto.2015.12.016},
  URL = {https://www.documentation.ird.fr/hor/fdi:010066271},
}