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Sequence · 2015-07-27

M 6.9 · Observed seismic cluster · Fox Islands, Aleutian Islands, 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 cluster30
M6+1
Analysis radius324 km
Observation window14 days
Largest secondary eventM 5.9
Quake Pulse

Sequence timeline

Within first 24 hours21
Within first 7 days28
Observed duration13.6 d
Gap from reference eventM 1.0
0 h13.6 d
Quake Pulse

Main-event impact

3 Felt reports · PAGER GREEN · Tsunami indicator · Shallow

64/100
Impact and context →

M4.5+ events in cluster

MagnitudeLocationDepthTime
M 6.9Fox Islands, Aleutian Islands, Alaska29.0 km2015-07-27 04:49:46 UTCView event →
M 5.951 km WSW of Nikolski, Alaska31.9 km2015-07-27 04:51:22 UTCView event →
M 5.297 km SSW of Nikolski, Alaska14.0 km2015-07-27 04:53:32 UTCView event →
M 5.789 km SSW of Nikolski, Alaska27.8 km2015-07-27 04:55:46 UTCView event →
M 4.797 km SSW of Nikolski, Alaska6.0 km2015-07-27 05:02:24 UTCView event →
M 4.660 km SSW of Nikolski, Alaska45.6 km2015-07-27 05:12:18 UTCView event →
M 4.771 km SSW of Nikolski, Alaska36.3 km2015-07-27 05:17:15 UTCView event →
M 4.789 km SSW of Nikolski, Alaska30.4 km2015-07-27 05:27:59 UTCView event →
M 5.487 km SSW of Nikolski, Alaska21.9 km2015-07-27 06:05:32 UTCView event →
M 5.178 km SSW of Nikolski, Alaska32.5 km2015-07-27 06:13:33 UTCView event →
M 5.0Fox Islands, Aleutian Islands, Alaska23.9 km2015-07-27 06:19:32 UTCView event →
M 4.995 km SSW of Nikolski, Alaska14.2 km2015-07-27 06:45:14 UTCView event →
M 4.773 km SSW of Nikolski, Alaska35.0 km2015-07-27 07:21:31 UTCView event →
M 5.982 km SSW of Nikolski, Alaska35.0 km2015-07-27 07:40:31 UTCView event →
M 5.566 km SSW of Nikolski, Alaska35.0 km2015-07-27 07:40:50 UTCView event →
M 5.677 km SW of Nikolski, Alaska35.0 km2015-07-27 07:41:04 UTCView event →
M 5.782 km SSW of Nikolski, Alaska39.6 km2015-07-27 07:43:31 UTCView event →
M 5.082 km SSW of Nikolski, Alaska39.9 km2015-07-27 08:27:52 UTCView event →
M 4.791 km SSW of Nikolski, Alaska20.1 km2015-07-27 10:45:08 UTCView event →
M 4.688 km SSW of Nikolski, Alaska11.7 km2015-07-27 10:54:26 UTCView event →
M 4.684 km SSW of Nikolski, Alaska39.1 km2015-07-27 20:14:22 UTCView event →
M 5.391 km SSW of Nikolski, Alaska20.0 km2015-07-28 21:21:35 UTCView event →
M 4.967 km SSW of Nikolski, Alaska41.8 km2015-07-29 07:41:08 UTCView event →
M 5.2104 km SSW of Nikolski, Alaska29.0 km2015-07-29 16:05:02 UTCView event →
M 5.0121 km SSW of Nikolski, Alaska17.3 km2015-07-31 05:12:35 UTCView event →
M 4.870 km SW of Nikolski, Alaska51.9 km2015-07-31 19:17:18 UTCView event →
M 5.167 km WSW of Nikolski, Alaska37.3 km2015-07-31 19:17:38 UTCView event →
M 4.7Fox Islands, Aleutian Islands, Alaska16.6 km2015-08-01 22:06:09 UTCView event →
M 5.075 km SW of Nikolski, Alaska41.0 km2015-08-08 19:09:34 UTCView event →
M 5.176 km S of Nikolski, Alaska22.2 km2015-08-09 18:20:46 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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