Analyses of unusual long-period earthquakes with extended coda recorded at Katmai National Park, Alaska, USA
Links
- More information: Publisher Index Page (via DOI)
- Open Access Version: Publisher Index Page
- Download citation as: RIS | Dublin Core
Abstract
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.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Analyses of unusual long-period earthquakes with extended coda recorded at Katmai National Park, Alaska, USA |
| Series title | Geophysical Research Letters |
| DOI | 10.1029/2005GL025581 |
| Volume | 33 |
| Issue | 7 |
| Year Published | 2006 |
| Language | English |
| Publisher | American Geophysical Union |
| Contributing office(s) | Volcano Hazards Program |
| Description | L07306, 4 p. |
| Country | United States |
| State | Alaska |
| Other Geospatial | Katmai National Park |
| Google Analytic Metrics | Metrics page |