Distinguishing high surf from volcanic long-period earthquakes
Article first published online: 20 FEB 2014
©2014. American Geophysical Union. All Rights Reserved.
Geophysical Research Letters
Volume 41, Issue 4, pages 1171–1178, 28 February 2014
How to Cite
2014), Distinguishing high surf from volcanic long-period earthquakes, Geophys. Res. Lett., 41, 1171–1178, doi:10.1002/2013GL058954., , , and (
- Issue published online: 19 MAR 2014
- Article first published online: 20 FEB 2014
- Accepted manuscript online: 4 FEB 2014 07:58AM EST
- Manuscript Accepted: 29 JAN 2014
- Manuscript Revised: 24 JAN 2014
- Manuscript Received: 4 DEC 2013
- Long-period seismicity;
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.