John, the rings come from Lowell
Posted by Roger Hunter on May 23, 2003 at 15:04:36:

and are distances where various travel paths and phases converge and reinforce one another.

Roger

Follow Ups:
     ● but what's the logic? - John Vidale  15:28:57 - 5/23/2003  (18780)  (2)
        ● Re: but what's the logic? - Canie  17:30:57 - 5/23/2003  (18785)  (0)
        ● Re: but what's the logic? - Roger Hunter  17:29:53 - 5/23/2003  (18784)  (1)
           ● I'd expect a different pattern - John Vidale  17:51:33 - 5/23/2003  (18786)  (2)
              ● Re: I'd expect a different pattern - Canie  21:52:51 - 5/23/2003  (18788)  (1)
                 ● Denali distribution of strong motions - John Vidale  22:50:14 - 5/23/2003  (18789)  (0)
              ● Re: I'd expect a different pattern - Roger Hunter  18:40:47 - 5/23/2003  (18787)  (0)