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Larsen et al. (2009) EOS
2008 eruption of Okmok
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Lu et al. (2005) JGR
Okmok deformation from InSAR
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strongtremor
OKWE RSAM
7/13 7/20 7/27 8/03 8/10 8/17
ampl
itude
(arb
. un
its)
Okmok eruption seismicity
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VLP tremor during Okmok eruption
VLP tremor has been previously reported by De Lauro et al. (2005) at Stromboli
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Stations used for tremor analysis
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Comparison of Amplitude Spectra
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OKSOz-OKFGz inter-station times
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Histograms of 10 inter-station times
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Tremor located NNW of Cone D
Haney (2010) JGR, in press
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new cone Cone D caldera rim
north south
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Similar phase velocity for Love waves, so a similar inter-station time expected
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Horizontal components
Not similar to ZZ or RR
Sign flip on OKFGt
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Radiation pattern for a vertical CLVD
Azimuth constrained by Love waves, source depth by Rayleigh waves
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Rayleigh radiation: VLP tremor depth
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approx. edge of caldera
Masterlark, Haney, et al. (2010) JGR
Ambient noise tomography of Okmok
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Radiation pattern for a vertical CLVD
Haney (2010) JGR, in press
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Precursory seismicity at Okmok
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(the slope is 3/2)
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( )