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Article #8829Re: Types of earthquake waves
From: Richard Stead
Date: Fri, 11 Feb 1994 07:14
Date: Fri, 11 Feb 1994 07:14
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2055 bytes
In article <2j6b51$fo@elroy.jpl.nasa.gov> stephen@crank.jpl.nasa.gov (Stephen Watson) writes: >In article <1994Feb5.194031.7607@texhrc.uucp>, gpcsjs@sjstat.NoSubdomain.NoDomain (Stanley J. Sramek) writes: >|> Sheriff describes Rayleigh waves in these words: > >And the natural follow-on question: what are Love waves? (That is the right name, Nobody else seems to have answered this yet... Yes, Love waves are the other type of surface wave. Specifically, they are a special type of SH wave trapped in a crustal waveguide. SH waves are that component of S waves that produce motion only parallel to the surface - the motion is side to side. They are trapped by the increase in velocity with depth and the fact that they cannot convert to P waves or Rayleigh waves like the SV component of S can. The most readily observed Love waves are the 20-second oceanic Love waves. This is because the ocean crust is such an excellent waveguide at that frequency. These trains can last for several minutes. Different structures allow different frequencies to be trapped, but they remain trapped only as far as the structure persists with the same thickness. -- Richard Stead Arlington, VA stead@seismo.css.gov
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 111c3f,7ca4767b95098142 X-Google-Attributes: gid111c3f,public X-Google-Thread: 10b271,7ca4767b95098142 X-Google-Attributes: gid10b271,public X-Google-ArrivalTime: 1994-02-10 23:14:17 PST Path: arc1-ca.pugleaf.net!gmd.de!xlink.net!howland.reston.ans.net!paladin.american.edu!europa.eng.gtefsd.com!library.ucla.edu!agate!overload.lbl.gov!lll-winken.llnl.gov!seismo!stead From: stead@seismo.CSS.GOV (Richard Stead) Newsgroups: sci.physics,ca.earthquakes Subject: Re: Types of earthquake waves Date: 11 Feb 1994 07:14:17 GMT Organization: Center for Seismic Studies, Arlington, VA Lines: 26 Message-ID: <2jfb89$iod@seismo.CSS.GOV> References: <CKrFIt.D0J@unocal.com> <1994Feb5.194031.7607@texhrc.uucp> <2j6b51$fo@elroy.jpl.nasa.gov> NNTP-Posting-Host: skadi.css.gov