@article{fdi:010077833,
  title = {{S}trong site effect revealed by a new broadband seismometer on the continental shelf offshore {N}ice airport ({S}outheastern {F}rance)},
  author = {{C}ourboulex, {F}. and {M}ercerat, {E}. {D}. and {D}eschamps, {A}. and {M}igeon, {S}. and {B}aques, {M}. and {L}arroque, {C}. and {R}ivet, {D}. and {H}ello, {Y}ann},
  editor = {},
  language = {{ENG}},
  abstract = {{A} broadband seismological station ({PRIMA}) installed offshore {N}ice airport (southeastern {F}rance) reveals a strong amplification effect of seismic waves. {PRIMA} station was in operation for 2 years (9/2016 to 10/2018) on the outer shelf at a water depth of 18 m. {S}ituated at the mouth of the {V}ar {R}iver, this zone is unstable and prone to landslides. {A} catastrophic landslide and tsunami already occurred in 1979, causing 10 casualties. {G}iven the level of seismicity of the area, it is important to infer the impact of an earthquake on this zone. {W}e analyze the recordings of earthquakes and seismic noise at the {PRIMA} station by comparing them to nearby inland stations. {W}e find that the seismic waves are strongly amplified at {PRIMA} at some specific frequencies (with an amplification factor greater than 10 at 0.9 {H}z). {U}sing geological and geophysical data, we show that the main amplification frequency peak (at 0.9 {H}z) is due to the velocity contrast between the {P}liocene sedimentary layer and fine-grained sediments dated from the {H}olocene, at about 100 m depth. {T}his velocity contrast is also present along the {V}ar valley, but the level of amplification detected on {PRIMA} station is larger. {U}sing numerical simulations of seismic waves in a 2{D} model that accounts for the pinch-out geometry related to the termination of the {H}olocene sedimentary layer, we can partially explain this amplification. {T}his offshore site effect could have a crucial impact on the triggering of a submarine landslide by an earthquake in this region. {M}ore generally, this effect should be taken into account for the modeling of landslides and induced tsunamis triggered by seismic waves.},
  keywords = {{E}arthquakes ; site effects ; landslides ; offshore seismometer ; seismic ; hazard ; {FRANCE} ; {MEDITERRANEE} ; {ALPES} ; {NICE}},
  booktitle = {},
  journal = {{P}ure and {A}pplied {G}eophysics},
  volume = {177},
  numero = {},
  pages = {3205–3224},
  ISSN = {0033-4553},
  year = {2020},
  DOI = {10.1007/s00024-019-02408-9},
  URL = {https://www.documentation.ird.fr/hor/fdi:010077833},
}