End of N.Z. far-field aftershock sequence?
Posted by Lowell on August 29, 2001 at 10:37:27:

Hi All,
I received the following message today:

The X-class flare combined with the Me 7.2 off the east coast of New Zealand on
21 August have produced an extensive and well-recognizable far-field aftershock
sequence. Normally we give a 10-day period of aftershock triggering following
a large mainshock as we did in this case. However, the flare appears to have
brought about additional triggering which has further caused earthquakes to
occur earlier than they otherwise would have. So, we are expecting the
far-field sequence to end shortly, officially the end is now set at midnight tonight (UT)
(i.e. 00:00 UT August 30,2001) instead of the end of day on August 31 as originally
posted.
The strong sequence of mid-ocean ridge events which began after the flare,
however is expected to continue for at least two more days. Mid-ocean ridge
events have thus far occurred South of Africa, in the south and north Mid-Atlantic
Ridges, in the region near Svalbard, in the Gulf of Aden, the East Africa Rift valley,
the Arctic ocean, South of Panama, east of Australia, the East Pacific Rise
and in the South Indian Ocean. All these events have occurred in the 4 days since
the flare. This is a considerable increase in mid-ocean ridge seismicity over background
levels, but is typical of increased oceanic activity following major solar flares.


Follow Ups:
     ● Re: End of N.Z. far-field aftershock sequence? - Lowell  10:40:35 - 8/29/2001  (9183)  (1)
        ● Re: End of N.Z. far-field aftershock sequence? - Don In Hollister  11:50:38 - 8/29/2001  (9186)  (1)
           ● Re: End of N.Z. far-field aftershock sequence? - Lowell  12:52:28 - 8/29/2001  (9189)  (0)