@article{PAR00018344,
  title = {{W}avefield characteristics and spatial incoherency : a comparative study from {A}rgostoli {R}ock- and soil-site dense seismic arrays},
  author = {{I}mtiaz, {A}. and {P}erron, {V}. and {H}ollender, {F}. and {B}ard, {P}. {Y}. and {C}ornou, {C}{\'e}cile and {S}vay, {A}. and {T}heodoulidis, {N}.},
  editor = {},
  language = {{ENG}},
  abstract = {{R}ecordings from two dense arrays deployed at {A}rgostoli, {C}ephalonia {I}sland, {G}reece, are analyzed with three objectives: (1) exploring to what extent the diffracted surface waves influence the seismic wavefield at a rock site, (2) investigating the loss of coherency of ground motions, and (3) comparing the results for two nearby sites with different soil conditions. {T}he two dense arrays under consideration consist of 21 velocimeters encompassing a central station in four concentric circles with diameters 10-180 m at the soft-soil site and 20-360 m at the rock site. {T}he datasets include 40 or more events with relatively homogeneous distributions in epicentral distances (10-200 km), magnitudes (2-5), and back azimuths. {T}he wavefields are analyzed using the {MUSIQUE} algorithm: back azimuth and slowness of dominant incoming waves are extracted, and {L}ove and {R}ayleigh waves are identified. {A}verage lagged coherency estimates are provided for interstation distances 10-20, 20-30, 30-40, and 80-90 m. {C}oherency is observed to be generally larger on the rock site compared with the soft-soil site, especially at frequencies below 5 {H}z. {A}t the soil site, lower coherency is observed for pairs along the valley-perpendicular direction while no such directional dependence is observed at the rock. {A}lthough about 40%-60% of the seismogram energy at the soft-soil site could be associated with diffracted surface waves ({L}ove and {R}ayleigh) propagating along the valley-perpendicular direction, only about 20% of energy at the rock site could be characterized as diffracted surface waves. {C}omparison with the widely quoted parametric models reveals little correlation with the observed decay of coherency at both sites. {T}hese significant differences between rock and soft-soil array results indicate that the spatial incoherency is largely site dependent and is likely to be closely related to the formation of locally generated wavefield.},
  keywords = {{GRECE} ; {CEPHALONIE}},
  booktitle = {},
  journal = {{B}ulletin of the {S}eismological {S}ociety of {A}merica},
  volume = {108},
  numero = {5{A}},
  pages = {2839--2853},
  ISSN = {0037-1106},
  year = {2018},
  DOI = {10.1785/0120180025},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00018344},
}