@article{PAR00006495,
  title = {{S}ource mechanism of long-period events recorded by a high-density seismic network during the 2008 eruption on {M}ount {E}tna},
  author = {{D}e {B}arros, {L}. and {L}okmer, {I}. and {B}ean, {C}. {J}. and {O}'{B}rien, {G}. {S}. and {S}accorotti, {G}. and {M}{\'e}taxian, {J}ean-{P}hilippe and {Z}uccarello, {L}. and {P}atane, {D}.},
  editor = {},
  language = {{ENG}},
  abstract = {{O}ne hundred twenty-nine long-period ({LP}) events, divided into two families of similar events, were recorded by the 50 stations deployed on {M}ount {E}tna in the second half of {J}une 2008. {D}uring this period lava was flowing from a lateral fracture after a summit {S}trombolian eruption. {I}n order to understand the mechanisms of these events, we perform moment tensor inversions. {I}nversions are initially kept unconstrained to estimate the most likely mechanism. {N}umerical tests show that unconstrained inversion leads to reliable moment tensor solutions because of the close proximity of numerous stations to the source positions. {H}owever, single forces cannot be accurately determined as they are very sensitive to uncertainties in the velocity model. {C}onstrained inversions for a crack, a pipe or an explosion then allow us to accurately determine the structural orientations of the source mechanisms. {B}oth numerical tests and {LP} event inversions emphasise the importance of using stations located as close as possible to the source. {I}nversions for both families show mechanisms with a strong volumetric component. {T}hese events are most likely generated by cracks striking {SW}-{NE} for both families and dipping 70 degrees {SE} (family 1) and 50 {NW} (family 2). {F}or family 1 events, the crack geometry is nearly orthogonal to the dikelike structure along which events are located, while for family 2 the location gave two pipelike bodies that belong to the same plane as the crack mechanism. {T}he orientations of the cracks are consistent with local tectonics, which shows a {SW}-{NE} weakness direction. {T}he {LP} events appear to be a response to the lava fountain occurring on 10 {M}ay 2008 as opposed to the flank lava flow.},
  keywords = {},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch.{S}olid {E}arth},
  volume = {116},
  numero = {},
  pages = {{B}01304},
  ISSN = {0148-0227},
  year = {2011},
  DOI = {10.1029/2010jb007629},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00006495},
}