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Sequence · 2013-09-04

M 6.5 · Observed seismic cluster · 81 km SSW of Atka, Alaska

Explore clusters of M4.5+ events observed around significant earthquakes. These clusters are descriptive and are not presented as earthquake predictions.

M4.5+ events in cluster34
M6+3
Analysis radius260 km
Observation window14 days
Largest secondary eventM 6.1
Quake Pulse

Sequence timeline

Within first 24 hours12
Within first 7 days26
Observed duration11.9 d
Gap from reference eventM 0.4
0 h11.9 d
Quake Pulse

Main-event impact

PAGER GREEN · Tsunami indicator · Shallow

54/100
Impact and context →

M4.5+ events in cluster

MagnitudeLocationDepthTime
M 6.581 km SSW of Atka, Alaska20.0 km2013-09-04 02:32:30 UTCView event →
M 4.767 km SW of Atka, Alaska8.9 km2013-09-04 02:35:50 UTCView event →
M 4.699 km SSW of Atka, Alaska25.3 km2013-09-04 03:06:20 UTCView event →
M 5.890 km SSW of Atka, Alaska26.6 km2013-09-04 04:16:30 UTCView event →
M 5.294 km SSW of Atka, Alaska11.4 km2013-09-04 05:15:52 UTCView event →
M 5.780 km SSW of Atka, Alaska21.0 km2013-09-04 06:16:49 UTCView event →
M 6.082 km SSW of Atka, Alaska17.0 km2013-09-04 06:27:03 UTCView event →
M 5.286 km SSW of Atka, Alaska30.9 km2013-09-04 06:54:15 UTCView event →
M 4.789 km SSW of Atka, Alaska25.7 km2013-09-04 08:16:54 UTCView event →
M 4.7104 km SSW of Atka, Alaska28.5 km2013-09-04 09:16:29 UTCView event →
M 4.894 km SSW of Atka, Alaska30.1 km2013-09-04 18:57:24 UTCView event →
M 4.791 km SSW of Atka, Alaska25.6 km2013-09-04 23:54:03 UTCView event →
M 5.685 km SSW of Atka, Alaska20.0 km2013-09-05 05:43:39 UTCView event →
M 4.5100 km SSW of Atka, Alaska22.8 km2013-09-05 06:38:56 UTCView event →
M 4.9105 km SSW of Atka, Alaska26.5 km2013-09-05 07:44:05 UTCView event →
M 5.095 km S of Atka, Alaska25.3 km2013-09-05 09:34:22 UTCView event →
M 4.6104 km S of Atka, Alaska3.0 km2013-09-05 09:49:15 UTCView event →
M 5.185 km SSW of Atka, Alaska25.2 km2013-09-05 10:09:26 UTCView event →
M 4.789 km SSW of Atka, Alaska25.5 km2013-09-05 10:57:15 UTCView event →
M 4.698 km SSW of Atka, Alaska7.1 km2013-09-05 11:22:57 UTCView event →
M 4.697 km S of Atka, Alaska20.3 km2013-09-06 01:27:48 UTCView event →
M 4.798 km SSW of Atka, Alaska23.9 km2013-09-06 08:39:22 UTCView event →
M 4.8109 km S of Atka, Alaska17.2 km2013-09-07 13:12:18 UTCView event →
M 4.8102 km S of Atka, Alaska26.7 km2013-09-07 15:51:40 UTCView event →
M 4.888 km SSW of Atka, Alaska24.1 km2013-09-08 11:20:44 UTCView event →
M 4.9103 km ESE of Adak, Alaska10.0 km2013-09-09 13:20:12 UTCView event →
M 5.1209 km SW of Nikolski, Alaska40.5 km2013-09-12 15:25:23 UTCView event →
M 5.287 km SSW of Atka, Alaska19.1 km2013-09-14 00:27:13 UTCView event →
M 5.989 km SSW of Atka, Alaska20.0 km2013-09-14 15:42:46 UTCView event →
M 4.7Andreanof Islands, Aleutian Islands, Alaska25.6 km2013-09-14 15:45:05 UTCView event →
M 5.489 km SSW of Atka, Alaska24.8 km2013-09-14 17:09:03 UTCView event →
M 6.177 km SSW of Atka, Alaska24.0 km2013-09-15 16:21:37 UTCView event →
M 4.879 km SSW of Atka, Alaska25.1 km2013-09-15 17:22:13 UTCView event →
M 4.697 km SW of Atka, Alaska27.2 km2013-09-16 00:16:36 UTCView event →

Interpretation

Explore clusters of M4.5+ events observed around significant earthquakes. These clusters are descriptive and are not presented as earthquake predictions. Historical small-earthquake detection varies through time. Long-term comparisons are most robust at higher magnitude thresholds.

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