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TitreInterferometric seismic imaging around the active Lalor mine in the Flin Flon greenstone belt, Canada
AuteurRoots, E; Calvert, A J; Craven, J A
SourceTectonophysics vol. 718, 2017 p. 92-104, https://doi.org/10.1016/j.tecto.2017.04.024
Année2017
Séries alt.Ressources naturelles Canada, Contribution externe 20170027
ÉditeurElsevier
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1016/j.tecto.2017.04.024
Mediapapier; en ligne; numérique
Formatspdf
ProvinceManitoba; Saskatchewan
SNRC63K
Lat/Long OENS-102.0000 -100.0000 55.0000 54.0000
Sujetsinterpretations sismiques; levés sismiques; levés sismiques, sol; gîtes volcanogènes; gîtes sulfureux; levés de reflexion sismiques; Ceinture de Flin Flon Greenstone ; géophysique; tectonique
Illustrationslocation maps; seismic reflection profiles; seismic images; seismic cross-sections
ProgrammeCoordination de IGC-4, Initiative géoscientifique ciblée (IGC-4)
Résumé(disponible en anglais seulement)
Seismic interferometry, which recovers the impulse response of the Earth by cross-correlation of ambient noise recorded at sets of two receivers, has found several applications, including the generation of virtual shot gathers for use in seismic reflection processing. To evaluate the effectiveness of this passive recording technique in mineral exploration in a hard-rock environment, 336 receivers recorded 300 hours of ambient noise over the volcanogenic massive sulphide deposit of the recently discovered Lalor mine in the Canadian Flin Flon greenstone belt. A novel time-domain beamforming algorithm was developed to search for individual source locations, demonstrating that the vast majority of noise originated from the mine and ventilation shafts of the Lalor mine. The results of the beamforming were utilized in conjunction with F-K filtering to remove undesirable, mostly monochromatic surface wave noise originating from nearby sources. Virtual shot gathers were generated along three receiver lines, each of which was processed as a separate 2-D reflection line. Two of the resulting unmigrated reflection profiles are compared against coincident DMO-stacked data from a larger, coincident 3-D dynamite seismic survey that was also acquired over the Lalor mine in 2013. Using knowledge of the local geology derived from numerous boreholes, coherent events recovered in the passive reflection profiles are inferred to be either spurious arrivals or real reflections, some of which can be interpreted in terms of geological contacts, indicating the future potential of passive recording surveys in this hard rock setting.
Résumé(Résumé en langage clair et simple, non publié)
Développement d'un nouveau système de détection d'événement et d'une séquence de traitement spécialisée, à utiliser pour l'exploration sismique passive.
GEOSCAN ID300559