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Sequence · 2009-10-13

M 6.5 · Observed seismic cluster · 127 km E of Nikolski, 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 cluster10
M6+2
Analysis radius260 km
Observation window14 days
Largest secondary eventM 6.4
Quake Pulse

Sequence timeline

Within first 24 hours7
Within first 7 days10
Observed duration3.0 d
Gap from reference eventM 0.1
0 h3.0 d
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Main-event impact

Shallow

38/100
Impact and context →

M4.5+ events in cluster

MagnitudeLocationDepthTime
M 6.5127 km E of Nikolski, Alaska24.0 km2009-10-13 05:37:23 UTCView event →
M 4.7136 km ESE of Nikolski, Alaska9.5 km2009-10-13 05:56:24 UTCView event →
M 5.3116 km ESE of Nikolski, Alaska39.1 km2009-10-13 07:41:12 UTCView event →
M 5.0117 km ESE of Nikolski, Alaska38.0 km2009-10-13 07:46:25 UTCView event →
M 4.7122 km E of Nikolski, Alaska38.3 km2009-10-13 08:26:00 UTCView event →
M 4.5134 km ESE of Nikolski, Alaska27.8 km2009-10-13 09:54:29 UTCView event →
M 6.4123 km ESE of Nikolski, Alaska14.0 km2009-10-13 20:21:53 UTCView event →
M 5.5114 km S of Unalaska, Alaska20.0 km2009-10-15 00:13:33 UTCView event →
M 4.9127 km S of Unalaska, Alaska10.0 km2009-10-15 03:35:25 UTCView event →
M 4.7123 km E of Nikolski, Alaska34.9 km2009-10-16 05:00:50 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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