I did a search on [link to www.emsc-csem.org] for depth over 600 and mag over 6 and got this list...
2012-08-14 02:59:40.0 49.84 N 145.06 E 611 7.7 SEA OF OKHOTSK
2011-10-27 00:15:25.0 17.87 S 179.55 W 619 6.0 FIJI REGION
2011-09-15 19:31:02.0 21.59 S 179.41 W 630 7.3 FIJI REGION
2011-09-02 13:47:12.0 28.28 S 63.15 W 602 6.5 SANTIAGO DEL ESTERO, ARGENTINA
2011-07-22 06:56:40.0 20.27 S 178.54 W 602 6.0 FIJI REGION
2010-08-16 19:35:49.8 20.76 S 178.76 W 611 6.2 FIJI REGION
2010-07-29 07:31:57.1 6.58 N 123.35 E 616 6.5 MORO GULF, MINDANAO, PHILIPPINES
2010-07-23 23:15:10.1 6.83 N 123.27 E 639 7.4 MORO GULF, MINDANAO, PHILIPPINES
2010-07-23 22:08:11.3 6.72 N 123.49 E 600 7.3 MORO GULF, MINDANAO, PHILIPPINES
2009-12-10 02:30:51.4 53.51 N 152.67 E 643 6.1 SEA OF OKHOTSK
2009-10-04 10:58:01.0 6.74 N 123.51 E 628 6.5 MORO GULF, MINDANAO, PHILIPPINES
2009-08-28 01:51:19.9 7.17 S 123.42 E 633 6.8 BANDA SEA
2008-07-05 02:12:04.3 53.94 N 152.90 E 632 7.7 SEA OF OKHOTSK
2008-02-01 12:10:06.4 21.40 S 179.35 W 600 6.1 FIJI REGION
2007-07-21 13:27:01.6 7.94 S 71.21 W 621 6.0 AMAZONAS, BRAZIL
2007-05-06 22:01:09.5 19.25 S 179.39 W 703 6.1 FIJI REGION
2007-05-06 21:11:53.7 19.25 S 179.35 W 692 6.4 FIJI REGION
2006-02-24 14:15:45.8 17.87 S 179.72 W 640 6.0 FIJI REGION
2006-02-02 12:48:44.1 17.44 S 178.42 W 600 6.7 FIJI REGION

On 7/5/2008 there was a 7.7 in SEA OF OKHOTSK at nearly the same depth...just found it kind of interesting I guess.