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End of N.Z. far-field aftershock sequence?
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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)
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