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Sequence · 2014-06-23

M 7.9 · Observed seismic cluster · Rat 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 cluster39
M6+5
Analysis radius484 km
Observation window14 days
Largest secondary eventM 6.3
Quake Pulse · Major sequence

What the sequence shows

After the M 7.9 reference event, Quake Pulse counts 30 M4+ event(s) in the first 24 hours and 36 in the first 7 days. Fourteen-day M4.5+ activity is about 8.8× the average equivalent derived from the previous year. The largest secondary event is M 1.6 below the reference event.

93/100Sequence score
Events in the previous 24 h0
In the first hour9
In the first 24 hours30
In the first 7 days36
Within 14 days40
Peak one-hour count9

Local historical context

Descriptive comparison with M4.5+ events observed in the same radius during the 365 days before the sequence.

M4.5+ events / 365 d118Average 14-day equivalent4.5Activity / baseline ratio8.8×

A ratio above 1 means denser M4.5+ activity than the average equivalent derived from the previous 365 days. It is not a risk measure or a forecast.

Reference event

Largest secondary eventM 6.3Magnitude gapM 1.6Observed duration11.3 d

Earlier events are shown as context only. They are not labelled precursors and should not be interpreted as predictive signals.

Evolving sequence map

Shows M4+ cluster events according to elapsed time after the reference event.

1 hour24 hours7 days14 days
Rat Islands, Aleutian Islands, Alaska · 484 kmInteractive 3D view of earthquakes within 484 km of Rat Islands, Aleutian Islands, Alaska.Rat Islands, Aleutian Islands, AlaskaM 5.7 · Rat Islands, Aleutian Islands, Alaska · 18.0 kmM 4.9 · Rat Islands, Aleutian Islands, Alaska · 3.3 kmM 5.0 · Rat Islands, Aleutian Islands, Alaska · 18.1 kmM 4.7 · Rat Islands, Aleutian Islands, Alaska · 18.8 kmM 6.0 · Rat Islands, Aleutian Islands, Alaska · 22.5 kmM 6.0 · Rat Islands, Aleutian Islands, Alaska · 23.1 kmM 5.2 · Rat Islands, Aleutian Islands, Alaska · 21.8 kmM 4.7 · Rat Islands, Aleutian Islands, Alaska · 10.6 kmM 4.7 · Rat Islands, Aleutian Islands, Alaska · 31.7 kmM 5.1 · Rat Islands, Aleutian Islands, Alaska · 27.7 kmM 4.8 · Rat Islands, Aleutian Islands, Alaska · 41.6 kmM 6.0 · Rat Islands, Aleutian Islands, Alaska · 16.1 kmM 4.5 · Rat Islands, Aleutian Islands, Alaska · 18.0 kmM 4.8 · Rat Islands, Aleutian Islands, Alaska · 27.9 kmM 4.5 · Rat Islands, Aleutian Islands, Alaska · 26.1 kmM 4.7 · Rat Islands, Aleutian Islands, Alaska · 18.9 kmM 5.8 · Rat Islands, Aleutian Islands, Alaska · 21.1 kmM 4.7 · Rat Islands, Aleutian Islands, Alaska · 11.2 kmM 6.3 · 248 km ESE of Attu Station, Alaska · 144.9 kmM 4.6 · 237 km ESE of Attu Station, Alaska · 160.5 kmM 4.7 · 239 km ESE of Attu Station, Alaska · 159.5 kmM 4.5 · Rat Islands, Aleutian Islands, Alaska · 26.1 kmM 4.9 · 234 km ESE of Attu Station, Alaska · 159.2 kmM 5.2 · Rat Islands, Aleutian Islands, Alaska · 25.4 kmM 4.9 · Rat Islands, Aleutian Islands, Alaska · 22.2 kmM 5.7 · 231 km ESE of Attu Station, Alaska · 161.8 kmM 4.7 · Rat Islands, Aleutian Islands, Alaska · 32.7 kmM 4.6 · Rat Islands, Aleutian Islands, Alaska · 20.3 kmM 4.9 · 190 km WSW of Adak, Alaska · 176.1 kmM 4.6 · 269 km ESE of Attu Station, Alaska · 124.7 km
Rat Islands, Aleutian Islands, Alaska484 km30 Recent earthquakes

Detailed timeline

Dots represent M4+ events retained by the sequence detector. Dot size depends on magnitude.

0 h24 h7 d14 d

Sequences are descriptive groupings based on spatial and temporal proximity. Quake Pulse does not establish a causal link between every event here and does not provide earthquake forecasts.

Quake Pulse

Main-event impact

5 Felt reports · PAGER GREEN · Tsunami indicator · Intermediate

70/100
Impact and context →

M4.5+ events in cluster

MagnitudeLocationDepthTime
M 7.9Rat Islands, Aleutian Islands, Alaska109.0 km2014-06-23 20:53:09 UTCView event →
M 5.7Rat Islands, Aleutian Islands, Alaska105.9 km2014-06-23 21:00:01 UTCView event →
M 4.9Rat Islands, Aleutian Islands, Alaska95.9 km2014-06-23 21:05:26 UTCView event →
M 5.0Rat Islands, Aleutian Islands, Alaska116.7 km2014-06-23 21:05:55 UTCView event →
M 4.7Rat Islands, Aleutian Islands, Alaska103.3 km2014-06-23 21:07:13 UTCView event →
M 6.0Rat Islands, Aleutian Islands, Alaska102.9 km2014-06-23 21:11:40 UTCView event →
M 6.0Rat Islands, Aleutian Islands, Alaska101.9 km2014-06-23 21:30:46 UTCView event →
M 5.2Rat Islands, Aleutian Islands, Alaska112.0 km2014-06-23 21:32:22 UTCView event →
M 4.7Rat Islands, Aleutian Islands, Alaska107.7 km2014-06-23 21:37:07 UTCView event →
M 4.7Rat Islands, Aleutian Islands, Alaska124.4 km2014-06-23 21:42:58 UTCView event →
M 5.1Rat Islands, Aleutian Islands, Alaska121.0 km2014-06-23 22:03:28 UTCView event →
M 4.8Rat Islands, Aleutian Islands, Alaska126.1 km2014-06-23 22:18:38 UTCView event →
M 6.0Rat Islands, Aleutian Islands, Alaska106.6 km2014-06-23 22:29:51 UTCView event →
M 4.5Rat Islands, Aleutian Islands, Alaska101.2 km2014-06-23 22:39:41 UTCView event →
M 4.8Rat Islands, Aleutian Islands, Alaska119.7 km2014-06-23 22:47:53 UTCView event →
M 4.5Rat Islands, Aleutian Islands, Alaska100.4 km2014-06-23 23:33:53 UTCView event →
M 4.7Rat Islands, Aleutian Islands, Alaska112.7 km2014-06-23 23:39:32 UTCView event →
M 5.8Rat Islands, Aleutian Islands, Alaska100.3 km2014-06-24 00:52:28 UTCView event →
M 4.7Rat Islands, Aleutian Islands, Alaska100.2 km2014-06-24 01:20:12 UTCView event →
M 6.3248 km ESE of Attu Station, Alaska4.0 km2014-06-24 03:15:35 UTCView event →
M 4.6237 km ESE of Attu Station, Alaska9.0 km2014-06-24 03:19:29 UTCView event →
M 4.7239 km ESE of Attu Station, Alaska6.4 km2014-06-24 03:24:41 UTCView event →
M 4.5Rat Islands, Aleutian Islands, Alaska123.4 km2014-06-24 04:33:06 UTCView event →
M 4.9234 km ESE of Attu Station, Alaska16.8 km2014-06-24 04:39:08 UTCView event →
M 5.2Rat Islands, Aleutian Islands, Alaska121.4 km2014-06-24 06:20:22 UTCView event →
M 4.9Rat Islands, Aleutian Islands, Alaska115.9 km2014-06-24 06:55:30 UTCView event →
M 5.7231 km ESE of Attu Station, Alaska11.0 km2014-06-24 08:12:31 UTCView event →
M 4.7Rat Islands, Aleutian Islands, Alaska118.6 km2014-06-24 09:08:58 UTCView event →
M 4.6Rat Islands, Aleutian Islands, Alaska112.7 km2014-06-24 15:15:04 UTCView event →
M 4.9190 km WSW of Adak, Alaska20.0 km2014-06-24 15:40:42 UTCView event →
M 4.6269 km ESE of Attu Station, Alaska5.0 km2014-06-24 16:35:02 UTCView event →
M 5.2Rat Islands, Aleutian Islands, Alaska122.3 km2014-06-25 00:03:03 UTCView event →
M 4.5179 km ESE of Attu Station, Alaska27.5 km2014-06-26 08:09:32 UTCView event →
M 5.0133 km WSW of Adak, Alaska50.9 km2014-06-26 09:03:03 UTCView event →
M 4.5Rat Islands, Aleutian Islands, Alaska118.6 km2014-06-27 14:24:49 UTCView event →
M 4.6Rat Islands, Aleutian Islands, Alaska118.7 km2014-06-28 16:24:36 UTCView event →
M 4.8Rat Islands, Aleutian Islands, Alaska88.3 km2014-06-29 08:54:45 UTCView event →
M 5.2Rat Islands, Aleutian Islands, Alaska115.2 km2014-07-03 04:43:42 UTCView event →
M 5.7Rat Islands, Aleutian Islands, Alaska116.1 km2014-07-03 19:06:48 UTCView event →
M 4.5Rat Islands, Aleutian Islands, Alaska110.8 km2014-07-04 13:57:40 UTCView event →
M 4.9Rat Islands, Aleutian Islands, Alaska96.2 km2014-07-05 04:13:04 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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