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Re: 7.0 Landers Aftershock

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I'm somewhat outside my area of expertise, but I was given to 
understand that an aftershock is when new motion occurs on the 
rupture surface generated by an earlier earthquake.  That is, if an
earthquake broke line AF from C to D, and a new quake occurred along 
CD, that would be an aftershock.  I assume.  The problem is I'm 
not clear on a "time limit" for said aftershock, or a magnitude limit.
(Can a 6.0 have a 7.5 aftershock?  Logically no, but hey, this is 
Science...)  Also, it is likely that aftershocks will cluster near the 
ends of the rupture surface (I *think* what the guys at that OES meeting
were trying to say).  

I'll take a look around & see if my seismology text [blows dust off]
has anything useful to say on the matter.

More later. 


Charles Hamilton, EIT                   Graduate Student Researcher     
Department of Civil and                 Phone: 949.824.8694
    Environmental Engineering           FAX:   949.824.2117 
University of California, Irvine        Email: chamilto(--nospam--at)