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Sequence · 2025-08-04

M 6.2 · Observed seismic cluster · 202 km S of Severo-Kuril’sk, Russia

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 cluster53
M6+1
Analysis radius212 km
Observation window14 days
Largest secondary eventM 5.2
Quake Pulse · Strong sequence

What the sequence shows

After the M 6.2 reference event, Quake Pulse counts 10 M4+ event(s) in the first 24 hours and 40 in the first 7 days. Fourteen-day M4.5+ activity is about 9.0× the average equivalent derived from the previous year. The largest secondary event is M 1.0 below the reference event.

67/100Sequence score
Events in the previous 24 h16
In the first hour1
In the first 24 hours10
In the first 7 days40
Within 14 days72
Peak one-hour count4

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 d209Average 14-day equivalent8.0Activity / baseline ratio9.0×

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 5.2Magnitude gapM 1.0Observed duration13.9 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
202 km S of Severo-Kuril’sk, Russia · 212 kmInteractive 3D view of earthquakes within 212 km of 202 km S of Severo-Kuril’sk, Russia.202 km S of Severo-Kuril’sk, RussiaM 4.9 · 172 km ESE of Severo-Kuril’sk, Russia · 198.8 kmM 5.0 · 123 km SSE of Severo-Kuril’sk, Russia · 89.4 kmM 4.6 · 248 km SSE of Severo-Kuril’sk, Russia · 92.0 kmM 4.9 · 205 km ESE of Severo-Kuril’sk, Russia · 235.4 kmM 4.6 · 183 km ESE of Severo-Kuril’sk, Russia · 215.3 kmM 4.5 · 75 km S of Severo-Kuril’sk, Russia · 130.5 kmM 5.2 · 175 km S of Severo-Kuril’sk, Russia · 27.5 kmM 4.6 · 258 km SSE of Severo-Kuril’sk, Russia · 93.5 kmM 4.7 · 89 km ESE of Severo-Kuril’sk, Russia · 181.6 kmM 4.6 · 96 km SE of Severo-Kuril’sk, Russia · 161.6 km
202 km S of Severo-Kuril’sk, Russia212 km10 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

1 Felt reports · PAGER GREEN · Shallow

38/100
Impact and context →

M4.5+ events in cluster

MagnitudeLocationDepthTime
M 6.2202 km S of Severo-Kuril’sk, Russia16.0 km2025-08-04 04:20:54 UTCView event →
M 4.9172 km ESE of Severo-Kuril’sk, Russia18.5 km2025-08-04 04:24:58 UTCView event →
M 5.0123 km SSE of Severo-Kuril’sk, Russia38.8 km2025-08-04 06:48:35 UTCView event →
M 4.6248 km SSE of Severo-Kuril’sk, Russia10.0 km2025-08-04 07:05:01 UTCView event →
M 4.9205 km ESE of Severo-Kuril’sk, Russia10.0 km2025-08-04 10:26:22 UTCView event →
M 4.6183 km ESE of Severo-Kuril’sk, Russia10.0 km2025-08-04 11:30:49 UTCView event →
M 4.575 km S of Severo-Kuril’sk, Russia75.4 km2025-08-04 15:57:52 UTCView event →
M 5.2175 km S of Severo-Kuril’sk, Russia10.0 km2025-08-04 16:46:11 UTCView event →
M 4.6258 km SSE of Severo-Kuril’sk, Russia10.0 km2025-08-04 20:29:27 UTCView event →
M 4.789 km ESE of Severo-Kuril’sk, Russia35.0 km2025-08-05 00:11:06 UTCView event →
M 4.696 km SE of Severo-Kuril’sk, Russia35.0 km2025-08-05 02:54:20 UTCView event →
M 4.6216 km ESE of Severo-Kuril’sk, Russia10.0 km2025-08-05 06:53:24 UTCView event →
M 4.5184 km E of Severo-Kuril’sk, Russia10.0 km2025-08-05 07:52:44 UTCView event →
M 4.8148 km E of Severo-Kuril’sk, Russia10.0 km2025-08-05 08:14:11 UTCView event →
M 4.8153 km ESE of Severo-Kuril’sk, Russia34.0 km2025-08-05 12:39:40 UTCView event →
M 4.5206 km SE of Severo-Kuril’sk, Russia10.0 km2025-08-05 19:58:03 UTCView event →
M 4.5179 km SE of Severo-Kuril’sk, Russia10.0 km2025-08-06 02:27:53 UTCView event →
M 5.1207 km ESE of Severo-Kuril’sk, Russia10.0 km2025-08-06 05:01:27 UTCView event →
M 4.592 km S of Severo-Kuril’sk, Russia64.7 km2025-08-06 07:52:02 UTCView event →
M 4.560 km SSW of Severo-Kuril’sk, Russia90.9 km2025-08-06 13:49:14 UTCView event →
M 4.9109 km SE of Severo-Kuril’sk, Russia47.9 km2025-08-06 20:27:20 UTCView event →
M 4.6162 km S of Severo-Kuril’sk, Russia35.0 km2025-08-07 02:53:01 UTCView event →
M 4.5109 km SSW of Severo-Kuril’sk, Russia100.5 km2025-08-07 16:26:37 UTCView event →
M 4.5168 km SSW of Severo-Kuril’sk, Russia64.4 km2025-08-07 17:51:24 UTCView event →
M 5.1193 km E of Severo-Kuril’sk, Russia10.0 km2025-08-07 22:07:40 UTCView event →
M 4.812 km E of Severo-Kuril’sk, Russia103.4 km2025-08-08 01:39:08 UTCView event →
M 4.9111 km ESE of Severo-Kuril’sk, Russia35.0 km2025-08-08 02:20:47 UTCView event →
M 4.9159 km S of Severo-Kuril’sk, Russia36.4 km2025-08-08 02:42:07 UTCView event →
M 4.5222 km ESE of Severo-Kuril’sk, Russia10.0 km2025-08-08 04:51:31 UTCView event →
M 4.6100 km ESE of Severo-Kuril’sk, Russia43.8 km2025-08-08 08:24:28 UTCView event →
M 4.8174 km SSW of Severo-Kuril’sk, Russia64.7 km2025-08-08 08:39:00 UTCView event →
M 4.7195 km ESE of Severo-Kuril’sk, Russia10.0 km2025-08-08 13:10:12 UTCView event →
M 5.096 km SSW of Severo-Kuril’sk, Russia75.4 km2025-08-09 06:52:29 UTCView event →
M 4.6185 km ESE of Severo-Kuril’sk, Russia10.0 km2025-08-09 09:52:26 UTCView event →
M 4.5214 km S of Severo-Kuril’sk, Russia10.5 km2025-08-09 10:04:24 UTCView event →
M 4.5184 km ESE of Severo-Kuril’sk, Russia10.0 km2025-08-09 12:42:46 UTCView event →
M 4.6202 km SSW of Severo-Kuril’sk, Russia83.5 km2025-08-09 15:52:53 UTCView event →
M 4.5146 km SE of Severo-Kuril’sk, Russia10.0 km2025-08-09 18:30:48 UTCView event →
M 4.5169 km E of Severo-Kuril’sk, Russia50.7 km2025-08-09 20:53:11 UTCView event →
M 4.5200 km SE of Severo-Kuril’sk, Russia10.0 km2025-08-10 03:53:46 UTCView event →
M 4.8194 km ESE of Severo-Kuril’sk, Russia10.0 km2025-08-10 16:58:04 UTCView event →
M 4.973 km E of Severo-Kuril’sk, Russia63.4 km2025-08-11 09:53:42 UTCView event →
M 5.077 km SE of Severo-Kuril’sk, Russia42.7 km2025-08-11 17:25:33 UTCView event →
M 4.5147 km SE of Severo-Kuril’sk, Russia10.0 km2025-08-12 03:34:44 UTCView event →
M 4.688 km SE of Severo-Kuril’sk, Russia38.0 km2025-08-12 04:15:49 UTCView event →
M 4.6194 km ESE of Severo-Kuril’sk, Russia10.0 km2025-08-12 12:57:44 UTCView event →
M 4.5161 km S of Severo-Kuril’sk, Russia41.4 km2025-08-12 16:39:14 UTCView event →
M 4.8175 km E of Severo-Kuril’sk, Russia10.0 km2025-08-12 19:06:53 UTCView event →
M 4.6207 km SSW of Severo-Kuril’sk, Russia102.9 km2025-08-12 19:07:21 UTCView event →
M 5.1219 km ESE of Severo-Kuril’sk, Russia10.4 km2025-08-12 20:24:00 UTCView event →
M 4.6179 km ESE of Severo-Kuril’sk, Russia10.0 km2025-08-12 22:26:04 UTCView event →
M 4.9214 km E of Severo-Kuril’sk, Russia10.0 km2025-08-12 23:52:04 UTCView event →
M 4.6202 km E of Severo-Kuril’sk, Russia10.0 km2025-08-13 12:43:32 UTCView event →
M 4.9221 km E of Severo-Kuril’sk, Russia10.0 km2025-08-13 14:18:04 UTCView event →
M 4.7143 km E of Severo-Kuril’sk, Russia27.7 km2025-08-13 15:35:59 UTCView event →
M 4.5155 km ESE of Severo-Kuril’sk, Russia10.0 km2025-08-13 23:11:56 UTCView event →
M 4.5176 km ESE of Severo-Kuril’sk, Russia19.2 km2025-08-13 23:42:36 UTCView event →
M 5.0105 km SSW of Severo-Kuril’sk, Russia57.4 km2025-08-14 16:46:56 UTCView event →
M 4.5186 km ESE of Severo-Kuril’sk, Russia10.0 km2025-08-14 20:02:15 UTCView event →
M 5.098 km S of Severo-Kuril’sk, Russia64.4 km2025-08-14 21:52:02 UTCView event →
M 4.9119 km E of Severo-Kuril’sk, Russia35.0 km2025-08-14 23:12:39 UTCView event →
M 4.5208 km ESE of Severo-Kuril’sk, Russia10.0 km2025-08-15 18:54:03 UTCView event →
M 4.5175 km S of Severo-Kuril’sk, Russia35.5 km2025-08-15 19:06:43 UTCView event →
M 4.5187 km ESE of Severo-Kuril’sk, Russia27.9 km2025-08-16 05:56:58 UTCView event →
M 4.839 km SE of Severo-Kuril’sk, Russia65.4 km2025-08-16 08:20:42 UTCView event →
M 4.5155 km SSW of Severo-Kuril’sk, Russia75.8 km2025-08-16 13:42:53 UTCView event →
M 4.9171 km S of Severo-Kuril’sk, Russia21.4 km2025-08-16 15:51:11 UTCView event →
M 4.9161 km S of Severo-Kuril’sk, Russia30.7 km2025-08-16 15:51:59 UTCView event →
M 4.6162 km S of Severo-Kuril’sk, Russia31.7 km2025-08-16 15:54:54 UTCView event →
M 4.8168 km S of Severo-Kuril’sk, Russia26.7 km2025-08-16 15:59:21 UTCView event →
M 4.593 km SE of Severo-Kuril’sk, Russia35.0 km2025-08-18 00:51:56 UTCView event →
M 4.988 km S of Severo-Kuril’sk, Russia80.0 km2025-08-18 02:09:33 UTCView event →
M 4.8165 km SSW of Severo-Kuril’sk, Russia75.0 km2025-08-18 02:52:48 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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