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Sequence · 2025-08-25

M 6.1 · Observed seismic cluster · east of the Kuril Islands

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+1
Analysis radius196 km
Observation window14 days
Largest secondary eventM 4.8
Quake Pulse · Strong sequence

What the sequence shows

After the M 6.1 reference event, Quake Pulse counts 0 M4+ event(s) in the first 24 hours and 10 in the first 7 days. Fourteen-day M4.5+ activity is about 1.3× the average equivalent derived from the previous year. The largest secondary event is M 0.1 below the reference event.

61/100Sequence score
Events in the previous 24 h1
In the first hour0
In the first 24 hours0
In the first 7 days10
Within 14 days14
Peak one-hour count1

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 d280Average 14-day equivalent10.7Activity / baseline ratio1.3×

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 6.0Magnitude gapM 0.1Observed duration9.3 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
east of the Kuril Islands · 196 kmInteractive 3D view of earthquakes within 196 km of east of the Kuril Islands.east of the Kuril Islands
east of the Kuril Islands196 km0 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

PAGER GREEN · Shallow

31/100
Impact and context →

M4.5+ events in cluster

MagnitudeLocationDepthTime
M 6.1east of the Kuril Islands9.0 km2025-08-25 06:48:34 UTCView event →
M 4.8189 km ESE of Ozernovskiy, Russia27.7 km2025-08-26 10:32:13 UTCView event →
M 4.6246 km ESE of Severo-Kuril’sk, Russia10.0 km2025-08-26 14:55:10 UTCView event →
M 6.092 km E of Severo-Kuril’sk, Russia40.0 km2025-08-27 03:49:50 UTCView event →
M 4.7244 km ESE of Severo-Kuril’sk, Russia10.0 km2025-08-29 03:40:43 UTCView event →
M 4.6243 km ESE of Severo-Kuril’sk, Russia10.0 km2025-08-29 04:56:39 UTCView event →
M 4.8211 km E of Severo-Kuril’sk, Russia10.0 km2025-08-29 09:45:17 UTCView event →
M 4.5218 km ESE of Severo-Kuril’sk, Russia10.0 km2025-08-29 20:00:48 UTCView event →
M 5.0119 km SE of Severo-Kuril’sk, Russia24.4 km2025-08-30 16:59:41 UTCView event →
M 4.5164 km ESE of Ozernovskiy, Russia35.0 km2025-08-31 04:18:39 UTCView event →
M 4.7120 km E of Severo-Kuril’sk, Russia28.8 km2025-09-01 01:59:18 UTCView event →
M 4.6248 km SSE of Vilyuchinsk, Russia10.0 km2025-09-01 15:06:11 UTCView event →
M 4.5192 km SE of Severo-Kuril’sk, Russia10.0 km2025-09-02 04:00:48 UTCView event →
M 4.7159 km SE of Severo-Kuril’sk, Russia10.0 km2025-09-02 11:56:34 UTCView event →
M 4.5198 km ESE of Severo-Kuril’sk, Russia10.0 km2025-09-03 13:51:12 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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