reply to post by muzzy
Well you are right there. A 3.1 cannot be a 4.9. I am finding it interesting that the do not seem to be listing anything over 3.6. This is the list in
Icelandic.
Dagsetning Tími Breidd Lengd Dýpi Stærð Gæði Staður
2010-10-24 06:26:28,0 63,414 -23,870 1,1 2,4 90,01 9,0 km SSV af Eldeyjarboða á Rneshr.
2010-10-24 02:54:17,0 63,430 -23,965 1,1 2,5 90,01 10,4 km SV af Eldeyjarboða á Rneshr.
2010-10-24 01:07:05,9 63,355 -24,209 4,1 2,5 90,01 25,1 km SV af Eldeyjarboða á Rneshr.
2010-10-24 00:54:41,7 63,410 -23,838 1,1 2,4 85,82 9,1 km S af Eldeyjarboða á Rneshr.
2010-10-24 00:15:11,4 63,488 -23,951 1,1
3,0 90,01 7,2 km V af Eldeyjarboða á Rneshr.
2010-10-24 00:13:53,1 63,430 -23,876 1,1 2,6 90,01 7,5 km SSV af Eldeyjarboða á Rneshr.
2010-10-24 00:12:37,2 63,412 -23,883 1,5 2,7 59,23 9,5 km SSV af Eldeyjarboða á Rneshr.
2010-10-24 00:11:55,6 63,524 -23,371 5,1 1,9 81,81 17,7 km SSV af Geirfugladrangi á Rneshr.
2010-10-24 00:11:51,2 63,450 -23,884 0,2 2,4 90,01 5,9 km SV af Eldeyjarboða á Rneshr.
2010-10-23 23:44:54,0 63,490 -23,929 1,1 2,1 90,01 6,1 km V af Eldeyjarboða á Rneshr.
2010-10-23 23:39:55,5 63,407 -23,813 0,3 2,2 90,01 9,3 km S af Eldeyjarboða á Rneshr.
2010-10-23 23:22:57,5 63,539 -23,265 4,3 -9,0 40,49 15,5 km S af Geirfugladrangi á Rneshr.
2010-10-23 22:58:46,0 63,620 -23,956 1,1 2,3 77,28 16,2 km NNV af Eldeyjarboða á Rneshr.
2010-10-23 22:58:45,5 63,593 -24,010 1,1 2,3 90,01 15,3 km NV af Eldeyjarboða á Rneshr.
2010-10-23 22:44:54,2 63,377 -23,977 1,1 -9,0 86,49 15,2 km SV af Eldeyjarboða á Rneshr.
2010-10-23 22:28:35,4 63,696 -22,732 1,1 -9,0 90,01 11,6 km S af Reykjanestá
2010-10-23 22:14:59,2 63,457 -23,975 1,1 2,1 59,94 9,2 km VSV af Eldeyjarboða á Rneshr.
2010-10-23 22:09:47,9 63,432 -24,060 12,6
3,1 53,21 14,2 km VSV af Eldeyjarboða á Rneshr.
2010-10-23 22:09:44,3 63,839 -22,331 1,1 2,0 41,47 5,5 km A af Grindavík
2010-10-23 22:09:38,9 63,432 -24,060 12,6
3,1 57,22 14,2 km VSV af Eldeyjarboða á Rneshr.
2010-10-23 22:09:33,3 63,494 -23,689 8,5 2,1 74,22 5,8 km A af Eldeyjarboða á Rneshr.
2010-10-23 22:09:20,7 63,032 -25,128 4,5
3,6 35,10 83,4 km SV af Eldeyjarboða á Rneshr.
2010-10-23 21:58:28,7 63,335 -23,986 1,1 2,6 86,26 19,4 km SSV af Eldeyjarboða á Rneshr.
2010-10-23 21:35:35,1 63,874 -22,393 1,1 0,5 45,50 4,6 km NNA af Grindavík
2010-10-23 21:35:20,6 63,347 -24,035 3,5 2,4 78,18 19,6 km SV af Eldeyjarboða á Rneshr.
2010-10-23 21:34:45,8 63,436 -23,755 4,8 2,3 35,60 6,5 km SSA af Eldeyjarboða á Rneshr.
2010-10-23 21:21:17,0 63,413 -23,872 3,4 -9,0 33,37 9,2 km SSV af Eldeyjarboða á Rneshr.
2010-10-23 21:14:29,3 63,527 -23,460 5,9 1,7 34,08 17,6 km ANA af Eldeyjarboða á Rneshr.
2010-10-23 21:12:23,5 63,455 -23,695 4,2 2,0 64,30 6,7 km SA af Eldeyjarboða á Rneshr.
2010-10-23 21:05:42,1 63,606 -23,444 17,1 2,3 90,02 11,2 km SV af Geirfugladrangi á Rneshr.
2010-10-23 21:03:49,7 63,377 -23,903 4,2 2,7 45,93 13,5 km SSV af Eldeyjarboða á Rneshr.
2010-10-23 20:48:10,0 63,525 -23,617 7,3 2,4 82,20 10,1 km ANA af Eldeyjarboða á Rneshr.
2010-10-23 20:48:08,4 63,471 -23,780 4,6 2,5 88,55 2,5 km SSA af Eldeyjarboða á Rneshr.
2010-10-23 20:38:32,1 63,639 -23,220 10,6 2,8 87,79 5,5 km SA af Geirfugladrangi á Rneshr.
2010-10-23 20:32:19,4 63,347 -23,951 2,0 2,9 67,96 17,5 km SSV af Eldeyjarboða á Rneshr.
2010-10-23 20:29:42,8 63,513 -23,567 1,1 2,8 48,17 12,1 km ANA af Eldeyjarboða á Rneshr.
2010-10-23 20:20:20,5 63,364 -24,216 2,5 -9,0 90,01 24,7 km SV af Eldeyjarboða á Rneshr.
2010-10-23 20:17:38,7 63,643 -23,235 1,1 1,9 63,69 4,7 km SSA af Geirfugladrangi á Rneshr.
2010-10-23 20:17:32,2 63,408 -23,951 1,1 2,7 90,01 11,6 km SV af Eldeyjarboða á Rneshr.
2010-10-23 20:12:54,0 63,390 -24,081 6,3 2,7 90,02 17,6 km SV af Eldeyjarboða á Rneshr.
2010-10-23 19:38:34,4 63,368 -23,920 1,1 2,5 90,01 14,7 km SSV af Eldeyjarboða á Rneshr.
2010-10-23 12:05:40,4 63,413 -23,763 1,1 2,4 55,79 8,8 km SSA af Eldeyjarboða á Rneshr.
2010-10-23 12:04:29,8 63,593 -23,328 1,1 -9,0 90,01 9,7 km SSV af Geirfugladrangi á Rneshr.
2010-10-22 19:50:40,2 63,395 -23,594 1,1 2,1 67,49 14,9 km SA af Eldeyjarboða á Rneshr.
Iceland has some undetermined quakes around the same time but, as an example, the quake listed by USGS and it's lapdog EMSC as 20:38 approx on the
23rd does not exist as far as Iceland is concerned and is listed as a 2.8 some 40 Km away. This may be the source of confusion. If the USGS thinks the
earthquake is in a difference place then they will get a different value for the magnitude.
The event listed as a 3 in the English version at 21:58 on the 23rd is the same event as the on listed by USGS as a 4.8, and in the Icelandic lists it
is a 2.6!!
Bearing in mind that TA said there was some sort of problem with the global seismo network I am wondering if this is the reason for the discrepancies?
I am not sure where USGS gets it's information, but certainly not from BORG
The start of the phase data for the 21:58 is thgus:
sta phase arrival res dist azm amp per mag amp per mag sta
SUMG ePn 22:01:34.58 -0.8 10.8 337 g:6.0-2 1.0 3.8 SUMG
CLL eP 22:04:04.55 0.6 22.9 104 b:8.9+1 1.8 5.0 CLL
BFO eP 22:04:05.91 -0.6 23.2 115 b:4.8+1 1.5 4.8 BFO
STU eP 22:04:06.69 0.1 23.2 113 b:2.4+2 2.5 5.3 STU
SENIN eP 22:04:17.02 -0.8 24.3 119 b:9.8+1 2.0 5.1 SENI
KHC eP 22:04:19.85 -1.8 24.8 107 KHC
TUE P 22:04:23.02 -1.5 25.1 116 g:8.2-3 .80 3.6 b:8.2+0 .80 4.5 TUE
MTE eP 22:04:23.96 1.8 24.8 149 b:3.2+1 1.2 4.9 MTE
BNI P 22:04:25.64 0.3 25.2 121 g:1.8-2 1.3 3.8 b:2.8+1 1.5 4.7 BNI
GEC2 eP 22:04:26.05 1.8 25.1 107 GEC2
PSZ eP 22:04:54.33 -0.6 28.5 102 b:1.6+1 1.3 4.7 PSZ
KEST eP 22:05:47.10 1.0 34.3 127 KEST
Now SUMG I know is on Greenland, my point being that the first listed station is NOT BORG on the island but further away therefore I consider the
remaining data even less accurate.
In my humble opinion the USGS have got these figures wrong, and the EMSC has just copied them.
Update - A comparison
EQ ID Network Src Date/Time UTC Latitude Longitude Magnitude Mag Type Depth(Km)
iceland 2010-10-23T22:09:20.700Z 63.0320 25.1280 3.6 ML 4.5
2010ctcb us 2010-10-23T21:58:59.000Z 63.1566 -24.1127 4.8 Mb 10
194907 emsc 2010-10-23T21:58:58.700Z 63.3100 -23.9500 4.6 mb 10
iceland 2010-10-23T21:58:58.700Z 63.3350 -23.9860 2.6 ML 1.1
194892 emsc 2010-10-23T20:38:29.400Z 63.5900 -23.5900 4.6 mb 10
2010ctbz us 2010-10-23T20:38:29.000Z 63.4025 -23.7386 4.9 Mb 8.7
iceland 23-10-2010T20:38:32.1Z 63.6390 -23.2200 2.8 ML 10.6
edit on 24/10/2010 by PuterMan because: Removed some of the unrelated quakes in
the list and added the comparison