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Sequence · 2026-03-26

M 6.5 · Observed seismic cluster · 123 km E of Yamada, Japan

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 cluster12
M6+1
Analysis radius260 km
Observation window14 days
Largest secondary eventM 5.1
Quake Pulse · Strong sequence

What the sequence shows

After the M 6.5 reference event, Quake Pulse counts 7 M4+ event(s) in the first 24 hours and 10 in the first 7 days. Fourteen-day M4.5+ activity is about 1.5× the average equivalent derived from the previous year. The largest secondary event is M 1.4 below the reference event.

61/100Sequence score
Events in the previous 24 h2
In the first hour3
In the first 24 hours7
In the first 7 days10
Within 14 days12
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 d209Average 14-day equivalent8.0Activity / baseline ratio1.5×

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 5.1Magnitude gapM 1.4Observed duration12.1 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
123 km E of Yamada, Japan · 260 kmInteractive 3D view of earthquakes within 260 km of 123 km E of Yamada, Japan.123 km E of Yamada, JapanM 4.6 · 132 km E of Yamada, Japan · 9.7 kmM 4.6 · 115 km E of Yamada, Japan · 15.8 kmM 4.6 · 122 km E of Yamada, Japan · 6.2 kmM 4.6 · 121 km E of Yamada, Japan · 7.5 kmM 4.8 · 119 km E of Yamada, Japan · 15.4 kmM 4.5 · 110 km E of Miyako, Japan · 26.6 kmM 4.9 · 118 km E of Yamada, Japan · 5.0 km
123 km E of Yamada, Japan260 km7 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

8 Felt reports · PAGER GREEN · Shallow

46/100
Impact and context →

M4.5+ events in cluster

MagnitudeLocationDepthTime
M 6.5123 km E of Yamada, Japan16.0 km2026-03-26 14:18:51 UTCView event →
M 4.6132 km E of Yamada, Japan10.0 km2026-03-26 14:28:37 UTCView event →
M 4.6115 km E of Yamada, Japan10.0 km2026-03-26 14:37:05 UTCView event →
M 4.6122 km E of Yamada, Japan10.0 km2026-03-26 14:47:05 UTCView event →
M 4.6121 km E of Yamada, Japan10.0 km2026-03-26 15:59:44 UTCView event →
M 4.8119 km E of Yamada, Japan10.0 km2026-03-26 16:20:32 UTCView event →
M 4.5110 km E of Miyako, Japan10.0 km2026-03-26 16:55:41 UTCView event →
M 4.9118 km E of Yamada, Japan10.0 km2026-03-26 19:56:31 UTCView event →
M 4.8107 km E of Yamada, Japan10.0 km2026-03-27 15:24:32 UTCView event →
M 4.594 km ENE of Noda, Japan35.0 km2026-03-30 07:46:57 UTCView event →
M 5.135 km SSE of Onagawa Chō, Japan48.8 km2026-04-02 00:52:50 UTCView event →
M 4.627 km E of Onagawa Chō, Japan81.7 km2026-04-04 10:36:47 UTCView event →
M 4.693 km SE of Hiroo, Japan46.3 km2026-04-07 16:36:21 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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