Abstract
The records of strong earthquakes (December 26, 2004, Sumatra; February 27, 2010, Chile; and March 11, 2011, Tohoku) from broadband IRIS seismic stations are analyzed. Several days after the events, oscillations of 128–130 minutes in period start and last for about a month. The period of oscillations exceeds that of the Earth’s spheroidal eigen oscillation with the lowest frequency (53.9 min) by a factor of about two. Oscillations are of opposite polarity at stations located near the epicenters and at the symmetric point in the other hemisphere of the Earth. They manifest as trains of fluctuations migrating westward at 2.5° per hour. The amplitude of oscillations is up to few μGal.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
