Options
Propagation of microseisms from the deep ocean to land
Date Issued
2014-09-22
Date Available
2015-03-22T04:00:22Z
Abstract
Ocean-generated microseisms are faint Earth vibrations that result from pressure fluctuations at the sea floor generated by the interaction between ocean surface gravity waves, and are continuously recorded as low frequency seismic noise. Here we investigate microseism propagation away from deep-ocean source regions using the spectral element method for an oceanic model that contains realistic northeast Atlantic Ocean irregular-layered structure composed of water, sediment, and upper crust. It also includes structural heterogeneities and continental slope and shelf bathymetry. Numerical simulations of coupled acoustic and elastic wave propagation in both simplified models and the full realistic model show that most microseism energy is confined to sediment and water column waveguides. We also show that a significant portion of microseism energy is reflected back to the deep ocean by the continental slope, while only a small fraction of deep-ocean-generated microseism energy reaches land. We conclude that terrestrially observed microseisms are largely generated in shallow water on continental shelves.
Sponsorship
Science Foundation Ireland
Other Sponsorship
European Union Marie Curie Programme
Type of Material
Journal Article
Publisher
AIP Publishing
Journal
Geophysical Research Letters
Volume
41
Issue
18
Start Page
6374
End Page
6379
Copyright (Published Version)
2014 American Geophysical Union
Language
English
Status of Item
Peer reviewed
This item is made available under a Creative Commons License
File(s)
Owning collection
Scopus© citations
27
Acquisition Date
Apr 17, 2024
Apr 17, 2024
Views
1456
Last Week
1
1
Last Month
3
3
Acquisition Date
Apr 17, 2024
Apr 17, 2024
Downloads
405
Last Week
3
3
Last Month
9
9
Acquisition Date
Apr 17, 2024
Apr 17, 2024