Distinguishing high surf from volcanic long-period earthquakes
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Abstract
Repeating long-period (LP) earthquakes are observed at active volcanoes worldwide and are typically attributed to unsteady pressure fluctuations associated with fluid migration through the volcanic plumbing system. Nonvolcanic sources of LP signals include ice movement and glacial outburst floods, and the waveform characteristics and frequency content of these events often make them difficult to distinguish from volcanic LP events. We analyze seismic and infrasound data from an LP swarm recorded at Pagan volcano on 12–14 October 2013 and compare the results to ocean wave data from a nearby buoy. We demonstrate that although the events show strong similarity to volcanic LP signals, the events are not volcanic but due to intense surf generated by a passing typhoon. Seismo-acoustic methods allow for rapid distinction of volcanic LP signals from those generated by large surf and other sources, a critical task for volcano monitoring.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Distinguishing high surf from volcanic long-period earthquakes |
| Series title | Geophysical Research Letters |
| DOI | 10.1002/2013GL058954 |
| Volume | 41 |
| Issue | 4 |
| Year Published | 2014 |
| Language | English |
| Publisher | American Geophysical Union |
| Contributing office(s) | Volcano Hazards Program, Volcano Science Center |
| Description | 8 p. |
| First page | 1171 |
| Last page | 1178 |
| Country | Northern Mariana Islands |
| Other Geospatial | Pagan Volcano |
| Google Analytic Metrics | Metrics page |