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The first, a M7.7 off Queen Charlotte Island appears to have been a reverse thrust event with oblique motion of the Explorer Plate against the region where subduction thrust style of tectonics merges into the area of pure strike slip between the Pacific plate and North American plate. This region is shown in the figure below along with a slightly more recent M6.1 event on the southern margin of the Explorer Plate. These two events suggest that stress was relieved on the north end of the JDFP subduction zone. The recent earthquakes may reflect a northward focus of stress after the major tremor episode of 2012 which started under Vancouver Island.
There might not be a relationship between the two earthquakes and the intense cyclical tremor event of 2012, but this is the sort of relationship that needs to be explored to understand any warning trends for the next megaquake.
M6.1 - 269km ESE of Ozernovskiy, Russia 2013-03-24 04:18:34 UTC
50.718°N 160.155°E depth=9.7km (6.0mi)
269km (167mi) ESE of Ozernovskiy, Russia
274km (170mi) SSE of Vilyuchinsk, Russia
278km (173mi) SSE of Petropavlovsk-Kamchatskiy, Russia
300km (186mi) SSE of Yelizovo, Russia
2341km (1455mi) NE of Tokyo, Japan
M6.0 - 162km NW of Ceva-i-Ra, Fiji 2013-03-24 08:13:44 UTC
20.777°S 173.407°E depth=10.0km (6.2mi)
162km (101mi) NW of Ceva-i-Ra, Fiji
534km (332mi) SW of Nadi, Fiji
603km (375mi) WSW of Suva, Fiji
631km (392mi) ESE of Port-Vila, Vanuatu
639km (397mi) E of We, New Caledonia
sta phase arrival res dist azm amp per mag amp per mag sta
MARNCePn 08:15:00.51 -0.2 5.1 261 MARN
MSVF ePn 08:15:00.59 -3.7 5.3 56 MSVF
PINNCePn 08:15:10.58 -0.6 5.8 251 PINN
DZM ePn 08:15:22.52 0.5 6.6 258 DZM
OUZ ePn 08:17:09.66 1.3 14.4 179 OUZ
NIUE ePn 08:17:26.56 -0.3 15.8 87 NIUE
LHI ePn 08:17:37.97 -1.1 16.7 227 LHI
HNR ePn 08:17:44.50 -0.5 17.2 309 HNR