Sequence · 2026-07-28

M 6.8 · Observed seismic cluster · The 2026 Kumamoto Region, Japan Earthquake

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 cluster19
M6+1
Analysis radius308 km
Observation window14 days
Largest secondary eventM 5.6
Quake Pulse · Major sequence

What the sequence shows

After the M 6.8 reference event, Quake Pulse counts 6 M4+ event(s) in the first 24 hours and 14 in the first 7 days. Fourteen-day M4.5+ activity is about 26.1× the average equivalent derived from the previous year. The largest secondary event is M 1.2 below the reference event.

83/100Sequence score
Events in the previous 24 h0
In the first hour3
In the first 24 hours6
In the first 7 days14
Within 14 days23
Peak one-hour count3

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 d18Average 14-day equivalent0.7Activity / baseline ratio26.1×

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 5.6Magnitude gapM 1.2Observed duration13.6 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.

The 2026 Kumamoto Region, Japan Earthquake · 308 kmInteractive 3D view of earthquakes within 308 km of The 2026 Kumamoto Region, Japan Earthquake.The 2026 Kumamoto Region, Japan EarthquakeM 4.5 · 22 km NW of Yunomae, Japan · 25.0 kmM 5.6 · 15 km SSW of Honmachi, Japan · 31.3 kmM 4.9 · 15 km NNE of Tsunagi, Japan · 32.1 kmM 4.5 · 14 km WSW of Honmachi, Japan · 29.1 kmM 4.6 · 3 km ESE of Uki, Japan · 2.6 kmM 4.8 · 9 km NW of Honmachi, Japan · 17.6 km
The 2026 Kumamoto Region, Japan Earthquake308 km6 Recent earthquakes

Detailed timeline

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

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

95 Felt reports · PAGER RED · Shallow

79/100
Impact and context →

M4.5+ events in cluster

MagnitudeLocationDepthTime
M 6.8The 2026 Kumamoto Region, Japan Earthquake10.0 km2026-07-28 07:27:14 UTCView event →
M 4.522 km NW of Yunomae, Japan10.0 km2026-07-28 07:40:19 UTCView event →
M 5.615 km SSW of Honmachi, Japan10.0 km2026-07-28 08:08:34 UTCView event →
M 4.915 km NNE of Tsunagi, Japan10.0 km2026-07-28 08:18:54 UTCView event →
M 4.514 km WSW of Honmachi, Japan10.0 km2026-07-28 09:10:16 UTCView event →
M 4.63 km ESE of Uki, Japan10.0 km2026-07-28 12:26:18 UTCView event →
M 4.89 km NW of Honmachi, Japan14.4 km2026-07-28 14:01:57 UTCView event →
M 5.316 km N of Tsunagi, Japan10.0 km2026-07-29 13:19:36 UTCView event →
M 4.68 km W of Honmachi, Japan10.0 km2026-07-29 14:02:34 UTCView event →
M 5.03 km NW of Uto, Japan10.0 km2026-07-30 13:47:39 UTCView event →
M 4.98 km W of Matsubase, Japan10.0 km2026-08-01 12:47:23 UTCView event →
M 4.612 km WSW of Honmachi, Japan10.0 km2026-08-01 16:07:21 UTCView event →
M 5.344 km SE of Tsunō, Japan35.0 km2026-08-01 19:10:53 UTCView event →
M 4.614 km SE of Honmachi, Japan10.0 km2026-08-02 10:00:08 UTCView event →
M 4.512 km W of Honmachi, Japan10.0 km2026-08-04 05:06:39 UTCView event →
M 4.862 km ESE of Koseda, Japan28.1 km2026-08-04 19:56:56 UTCView event →
M 4.559 km SE of Koseda, Japan10.0 km2026-08-04 20:01:17 UTCView event →
M 4.151 km ESE of Koseda, Japan40.6 km2026-08-05 20:24:07 UTCView event →
M 4.913 km W of Honmachi, Japan10.0 km2026-08-05 22:59:24 UTCView event →
M 4.67 km WSW of Mifune, Japan10.0 km2026-08-06 10:49:23 UTCView event →
M 4.418 km NNW of Tsunagi, Japan10.0 km2026-08-08 23:02:06 UTCView event →
M 4.211 km SSW of Honmachi, Japan10.0 km2026-08-10 00:48:11 UTCView event →
M 4.116 km E of Amakusa, Japan10.2 km2026-08-10 17:47:16 UTCView event →
M 4.355 km SSE of Kushima, Japan35.0 km2026-08-10 22:59:54 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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