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For Cathryn - "Normal" |
Cathryn, the word "normal," as Chris is using it, is a seismological term which means vertical slip on a fault. Specifically, it means slip in an extensional environment, where two blocks move apart and consequently one slips down relative to the other. A better term to have used here, where we don't know much about the fault that produced the quake, is "dip-slip," meaning vertical slip in general (slip in the direction of the dip of the fault plane), as opposed to strike-slip (meaning horizontal slip along the strike of the fault). He did accurately convey that the predominant motion was horizontal rather than vertical. The opposite of "normal" is "reverse" - also dip slip, but where the stress regime is compressional. As to what's "normal" for Hawaii, I dunno, but I suspect a hot-spot volcanic area tends to be somewhat extensional. Mike Williams Follow Ups: ● Re: For Cathryn - "Normal" - Cathryn 21:02:24 - 10/15/2006 (41698) (1) ● Re: For Cathryn - "Normal" - heartland chris 06:46:40 - 10/16/2006 (41707) (1) ● Second Quake-Harvard MT Solution - Glen 10:44:47 - 10/16/2006 (41709) (2) ● Re: Second Quake-Harvard MT Solution - Glen 14:43:11 - 10/16/2006 (41712) (1) ● 1868 quakes 4 days apart - chris in suburbia 06:31:03 - 10/17/2006 (41721) (1) ● Hawaii flash flood - heartland chris 09:46:24 - 10/17/2006 (41723) (1) ● Re: Hawaii flash flood - Canie 11:43:30 - 10/17/2006 (41724) (0) ● Re: Second Quake-Harvard MT Solution - heartland chris 13:04:03 - 10/16/2006 (41710) (0) |
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