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Posted by John Vidale on September 02, 2011 at 09:26:53:

Chris,

People have looked for such correlations with decades of data. M6+ earthquakes are reliably recorded for many decades. Only a small excess of events happens at short lag times, the famous distant triggered events, and M6 earthquakes are very unlikely to trigger 1000s of km away.

And why would the magnitude of the second earthquake matter? Triggered activity follows the usual Gutenberg-Richter distribution.

Some things are just coincidences, and examination of a single instance is very difficult to interpret.

Follow Ups:
     ● Re: err: 4 within 36 hours: Roger?  - heartland chris  17:45:10 - 9/3/2011  (79178)  (1)
        ● New study request - Roger Hunter  20:09:37 - 9/3/2011  (79179)  (1)
           ● Re: New study request; first look - Roger Hunter  21:46:27 - 9/3/2011  (79180)  (2)
              ● 2+ M6s/week expected - heartland chris  07:37:49 - 9/4/2011  (79183)  (1)
                 ● 150 M6+ quakes/year - heartland chris  07:41:25 - 9/4/2011  (79184)  (1)
                    ● Re: 150 M6+ quakes/year: how many are aftershocks? - heartland chris  07:48:37 - 9/4/2011  (79186)  (1)
                       ● Re: 150 M6+ quakes/year: how many are aftershocks? - Roger Hunter  10:23:04 - 9/4/2011  (79187)  (1)
                          ● Re: 150 M6+ quakes/year: how many are aftershocks? - Roger Hunter  11:58:22 - 9/4/2011  (79188)  (1)
                             ● Re: 150 M6+ quakes/year: how many are aftershocks? - heartland chris  19:23:11 - 9/4/2011  (79190)  (1)
                                ● Re: 150 M6+ quakes/year: how many are aftershocks? - Roger Hunter  21:34:33 - 9/4/2011  (79191)  (1)
                                   ● yes, M6+, not M7+ - heartland chris  12:35:12 - 9/5/2011  (79193)  (2)
                                      ● Re: yes, M6+, not M7+ - Roger Hunter  15:37:22 - 9/5/2011  (79200)  (1)
                                         ● Re: yes, M6+, not M7+ - heartland chris  06:15:47 - 9/12/2011  (79221)  (1)
                                            ● Re: yes, M6+, not M7+ - Roger Hunter  15:27:33 - 9/12/2011  (79227)  (0)
                                      ● good example - John Vidale  13:30:36 - 9/5/2011  (79195)  (1)
                                         ● Re: good example - heartland chris  15:07:12 - 9/5/2011  (79198)  (1)
                                            ● also - John Vidale  16:26:34 - 9/5/2011  (79201)  (0)
              ● Earthquake Triggering Effects – September 3, 2011 - EQF  22:35:00 - 9/3/2011  (79181)  (0)