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M7.8 earthquake, Alaska, 2003-11-17

MagnitudeM7.8mwc

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Depth33 km

Time (UTC)2003-11-17 06:43

Rank in 20032 / 154among M6+

Rank since 1900203 / 14,458

Energy vs an M6×501approx.

Rat Islands, Aleutian Islands, Alaska · 51.15, 178.65

M5.5+ within 100 km in the next 30 days

Event	Time (UTC)	Depth	Place
M5.5 2003-11-17	2003-11-17 07:12	33 km	Rat Islands, Aleutian Islands, Alaska
M5.5 2003-11-18	2003-11-18 02:12	33 km	Rat Islands, Aleutian Islands, Alaska
M5.8 2003-11-18	2003-11-18 07:50	33 km	Rat Islands, Aleutian Islands, Alaska
M5.6 2003-12-08	2003-12-08 20:12	33 km	Rat Islands, Aleutian Islands, Alaska

M6.5+ within 300 km (largest first)

1965 M8.7M8.7

1906 M8.3M8.3

2014 M7.9M7.9

2003 M7.8M7.8

1965 M7.6M7.6

1965 M7.4M7.4

1939 M7.2M7.2

2003 M7.1M7.1

1916 M7.0M7.0

1981 M7.0M7.0

2003 M6.9M6.9

1965 M6.8M6.8

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.9 2003-06-23	2003-06-23 12:12	20 km	291 km SE of Attu Station, Alaska
M6.5 2003-06-15	2003-06-15 19:24	20 km	293 km ESE of Attu Station, Alaska
M6.2 2003-03-17	2003-03-17 18:55	33 km	Rat Islands, Aleutian Islands, Alaska
M7.1 2003-03-17	2003-03-17 16:36	33 km	Rat Islands, Aleutian Islands, Alaska
M6.6 2002-11-07	2002-11-07 15:14	33 km	289 km WSW of Adak, Alaska
M6.3 1998-08-20	1998-08-20 15:00	33 km	196 km SE of Attu Station, Alaska
M6.6 1997-12-17	1997-12-17 04:38	20 km	Rat Islands, Aleutian Islands, Alaska
M6.7 1997-03-26	1997-03-26 02:08	33 km	273 km WSW of Adak, Alaska
M6.8 1996-03-22	1996-03-22 03:24	20 km	Rat Islands, Aleutian Islands, Alaska
M6.5 1995-04-23	1995-04-23 02:55	17 km	260 km WSW of Adak, Alaska

Energy ratio uses the rule that one magnitude unit is about 32 times the energy. Magnitudes and locations are USGS values and can differ from national agencies. Older records are less complete and less precise.