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Sequence · 2011-10-21

M 7.4 · Observed seismic cluster · Kermadec Islands region

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 cluster25
M6+1
Analysis radius404 km
Observation window14 days
Largest secondary eventM 5.3
Quake Pulse

Sequence timeline

Within first 24 hours8
Within first 7 days22
Observed duration13.3 d
Gap from reference eventM 2.1
0 h13.3 d
Quake Pulse

Main-event impact

7 Felt reports · Shallow

55/100
Impact and context →

M4.5+ events in cluster

MagnitudeLocationDepthTime
M 7.4Kermadec Islands region33.0 km2011-10-21 17:57:16 UTCView event →
M 4.7Kermadec Islands region35.0 km2011-10-21 19:41:23 UTCView event →
M 4.7Kermadec Islands region35.0 km2011-10-21 20:38:51 UTCView event →
M 4.7Kermadec Islands region35.0 km2011-10-21 20:44:17 UTCView event →
M 4.5Kermadec Islands region154.0 km2011-10-22 06:35:00 UTCView event →
M 5.2Kermadec Islands region10.0 km2011-10-22 09:38:47 UTCView event →
M 4.6Kermadec Islands region35.0 km2011-10-22 11:03:34 UTCView event →
M 4.7Kermadec Islands region37.3 km2011-10-22 17:24:08 UTCView event →
M 4.6Kermadec Islands region35.0 km2011-10-22 19:31:47 UTCView event →
M 4.9Kermadec Islands region42.4 km2011-10-23 11:39:02 UTCView event →
M 5.2Kermadec Islands region45.6 km2011-10-24 11:49:59 UTCView event →
M 5.0Kermadec Islands region43.6 km2011-10-25 02:23:32 UTCView event →
M 4.8Kermadec Islands region10.0 km2011-10-25 20:46:27 UTCView event →
M 5.0south of the Fiji Islands49.5 km2011-10-26 00:13:23 UTCView event →
M 4.6south of the Fiji Islands81.7 km2011-10-27 05:04:05 UTCView event →
M 4.9south of the Fiji Islands10.0 km2011-10-27 05:51:19 UTCView event →
M 4.5Kermadec Islands region47.0 km2011-10-27 11:52:13 UTCView event →
M 4.6Kermadec Islands region10.0 km2011-10-27 21:35:37 UTCView event →
M 5.3Kermadec Islands region49.6 km2011-10-28 11:07:01 UTCView event →
M 4.7south of the Fiji Islands35.0 km2011-10-28 11:24:06 UTCView event →
M 4.8Kermadec Islands region35.0 km2011-10-28 11:29:56 UTCView event →
M 4.5Kermadec Islands region35.0 km2011-10-28 11:55:26 UTCView event →
M 4.5Kermadec Islands region46.7 km2011-10-30 09:46:18 UTCView event →
M 4.8Kermadec Islands region10.0 km2011-11-01 12:42:16 UTCView event →
M 4.6Kermadec Islands region34.1 km2011-11-04 00:30:56 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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