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Presentation transcript:

Larsen et al. (2009) EOS 2008 eruption of Okmok

strong tremor OKWE RSAM 7/137/207/278/038/108/17 amplitude (arb. units) Okmok eruption seismicity

VLP tremor during Okmok eruption VLP tremor has been previously reported by De Lauro et al. (2005) at Stromboli

Stations used for tremor analysis

Comparison of Amplitude Spectra

OKSOz-OKFGz inter-station times

Histograms of 10 inter-station times

Tremor located NNW of Cone D Haney (2010) JGR, in press

new coneCone D caldera rim northsouth

Similar phase velocity for Love waves, so a similar inter-station time expected

Horizontal components Not similar to ZZ or RR Sign flip on OKFGt

Radiation pattern for a vertical CLVD Azimuth constrained by Love waves, source depth by Rayleigh waves

Rayleigh radiation: VLP tremor depth

approx. edge of caldera Masterlark, Haney, et al. (2010) JGR Ambient noise tomography of Okmok

Radiation pattern for a vertical CLVD Haney (2010) JGR, in press