High-Q Overtone Modes of the Earth | RDL Research Database

Abstract

Overtone modes of free oscillation of the Earth have been observed with two instruments at two separate locations after the Colombian earthquake of July 31, 1970. Certain overtones persisted with a signal-to-noise ratio as high as 20 db for 50 hr after the origin time. Some spheroidal radial overtones (modes of type nS0) were found to have Q's near 1000, about three times the typical Q of a fundamental mode (0Sl). Multiplet centre frequencies and Q's were measured for several overtones, with good agreement between the two stations.

Keywords

OvertoneMultipletOscillation (cell signaling)PhysicsMode (computer interface)Normal modeNoise (video)Computational physicsEarth (classical element)Atomic physicsGeologySpectral lineAcousticsChemistryQuantum mechanicsAstronomyVibration

Affiliated Institutions

University of California, San Diego US

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Publication Info

Year: 1971
Type: article
Volume: 23
Issue: 4
Pages: 399-410
Citations: 34
Access: Closed

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APA Style

                            
                                
                                    Jay Dratler, 
                                
                                    William E. Farrell, 
                                
                                    Barry Block
                                
                                et al.
                            
                            (1971). 
                            High-Q Overtone Modes of the Earth. 
                            Geophysical Journal International
                            , 23
                            (4)
                            , 399-410.
                            https://doi.org/10.1111/j.1365-246x.1971.tb01832.x
                        

Identifiers

DOI: 10.1111/j.1365-246x.1971.tb01832.x