FN Archimer Export Format PT J TI Unusual seismic activity in 2011 and 2013 at the submarine volcano Rocard, Society hot spot (French Polynesia) BT AF TALANDIER, Jacques HYVERNAUD, Olivier MAURY, Rene AS 1:1;2:2;3:3; FF 1:;2:;3:; C1 CEA, DAM, DIF, Lab Detect & Geophys,Dept Anal & Surveillance Env, Arpajon, France. Commissariat Energie Atom & Energies Alternat, Lab Geophys, CEA, DAM,DIF, Papeete, France. Univ Brest, CNRS, UMR 6538, Domaines Ocean,IUEM, Pl Nicolas Copern, Plouzane, France. C2 CEA, FRANCE CEA, FRANCE UBO, FRANCE UM LGO IF 4.253 TC 10 UR https://archimer.ifremer.fr/doc/00639/75083/75614.pdf LA English DT Article AB We analyze two seismic events that occurred on 27 May 2011 and 29 April 2013 at the Rocard submarine volcano which overlies the Society hot spot. The Polynesian Seismic Network recorded for the first time unusual associated short-and long-period signals, with perfectly monochromatic (0.0589 Hz) Rayleigh wave trains of long period and duration. None of the numerous observations of long-period (10-30 s) signals previously associated with volcanic activity in Japan, Italy, Mexico, Indonesia, Antarctica, and the Hawaiian Islands have the characteristics we observed at Rocard. We propose a tentative model for these unusual and rather enigmatic signals, in which the movement of lava excited the resonance of a shallow open conduit under a high hydrostatic pressure of similar to 400 bars. PY 2016 PD MAY SO Geophysical Research Letters SN 0094-8276 PU Amer Geophysical Union VL 43 IS 9 UT 000378339200021 BP 4247 EP 4254 DI 10.1002/2016GL068342 ID 75083 ER EF