Microseisms and hum from ocean surface gravity waves

James TRAER; Peter GERSTOFT; Peter D BROMIRSKI; Peter M SHEARER

doi:10.1029/2012JB009550

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Microseisms and hum from ocean surface gravity waves

Journal article

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Microseisms and hum from ocean surface gravity waves

James TRAER, Peter GERSTOFT, Peter D BROMIRSKI and Peter M SHEARER

Journal of geophysical research, Vol.117(B11), B11307

2012

DOI: 10.1029/2012JB009550

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Abstract

Ocean waves incident on coasts generate seismic surface waves in three frequency bands via three pathways: direct pressure on the seafloor (primary microseisms, PM), standing waves from interaction of incident and reflected waves (double-frequency microseisms, DF), and swell-transformed infragravity wave interactions (the Earth's seismic hum). Beamforming of USArray seismic data shows that the source azimuths of the generation regions of hum, PM and DF microseisms vary seasonally, consistent with hemispheric storm patterns. The correlation of beam power with wave height over all azimuths is highest in near-coastal waters. Seismic signals generated by waves from Hurricane Irene and from a storm in the Southern Ocean have good spatial and temporal correlation with nearshore wave height and peak period for all three wave-induced seismic signals, suggesting that ocean waves in shallow water commonly excite hum (via infragravity waves), PM, and DF microseisms concurrently.

Earth, ocean, space

Earth sciences

Exact sciences and technology

Details

Title: Subtitle: Microseisms and hum from ocean surface gravity waves
Creators: James TRAER - Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California, United States
Peter GERSTOFT - Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California, United States
Peter D BROMIRSKI - Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California, United States
Peter M SHEARER - Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California, United States
Resource Type: Journal article
Publication Details: Journal of geophysical research, Vol.117(B11), B11307
DOI: 10.1029/2012JB009550
ISSN: 0148-0227
eISSN: 2156-2202
Publisher: American Geophysical Union; Washington, DC
Language: English
Date published: 2012
Academic Unit: Psychological and Brain Sciences; Iowa Neuroscience Institute
Record Identifier: 9984065465502771

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