Analyses of unusual long-period earthquakes with extended coda recorded at Katmai National Park, Alaska, USA

Details Analyses of unusual long-period earthquakes with extended coda recorded at Katmai National Park, Alaska, USA Analyses of unusual long-period earthquakes with extended coda recorded at Katmai National Park, Alaska, USA

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3307306d&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 7, CiteID L07306

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1

Seismology: Volcano Seismology (8419), Volcanology: Volcano Monitoring (7280), Volcanology: Hydrothermal Systems (0450, 1034, 3017, 3616, 4832, 8135)

Scientific paper

A swarm of six long-period (LP) events with slowly decaying coda wave amplitudes and durations up to 120 s, was recorded by seismic stations located in the proximity of Mt. Griggs, a fumarolically active volcano in the Katmai National Park, Alaska, during December 8-21, 2004. Spectral analyses reveal the quasi-monochromatic character of the waveforms, dominated by a 2.5 Hz mode frequently accompanied by a weaker high-frequency onset (6.0-9.0 Hz). Particle motion azimuths and inclination angles show a dominant WNW-ESE direction of polarization for all the signals, and suggest that seismic energy is radiated by a stable source at shallow depth. Damping coefficients between 0.0014 and 0.0063 are estimated by fitting an exponential decay model to the signal's coda; corresponding quality factors range from 78 to 351. The source of the waveforms is modelled as a resonant cavity filled with a fluid/gas mixture.

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