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Sequence · 2026-04-20

M 6.0 · Observed seismic cluster · 100 km E of Miyako, 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 cluster35
M6+1
Analysis radius180 km
Observation window14 days
Largest secondary eventM 5.5
Quake Pulse · Strong sequence

What the sequence shows

After the M 6.0 reference event, Quake Pulse counts 19 M4+ event(s) in the first 24 hours and 31 in the first 7 days. Fourteen-day M4.5+ activity is about 4.9× the average equivalent derived from the previous year. The largest secondary event is M 0.5 below the reference event.

64/100Sequence score
Events in the previous 24 h1
In the first hour10
In the first 24 hours19
In the first 7 days31
Within 14 days34
Peak one-hour count10

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 d180Average 14-day equivalent6.9Activity / baseline ratio4.9×

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 5.5Magnitude gapM 0.5Observed duration10.0 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
100 km E of Miyako, Japan · 180 kmInteractive 3D view of earthquakes within 180 km of 100 km E of Miyako, Japan.100 km E of Miyako, JapanM 5.3 · 135 km E of Miyako, Japan · 35.3 kmM 5.3 · 117 km E of Yamada, Japan · 28.9 kmM 5.4 · 143 km ENE of Miyako, Japan · 44.1 kmM 4.6 · 90 km ENE of Miyako, Japan · 20.1 kmM 4.9 · 114 km ENE of Miyako, Japan · 16.2 kmM 4.6 · 118 km E of Miyako, Japan · 21.9 kmM 4.6 · 124 km E of Miyako, Japan · 24.8 kmM 4.6 · 104 km E of Miyako, Japan · 5.0 kmM 5.4 · 111 km E of Miyako, Japan · 15.5 kmM 5.4 · 100 km E of Yamada, Japan · 35.2 kmM 5.1 · 127 km ENE of Miyako, Japan · 27.8 kmM 5.1 · 133 km E of Yamada, Japan · 45.0 kmM 4.5 · 98 km E of Miyako, Japan · 11.2 kmM 5.1 · 118 km E of Yamada, Japan · 31.2 kmM 4.7 · 119 km ENE of Miyako, Japan · 20.2 kmM 4.5 · 136 km E of Yamada, Japan · 54.4 kmM 4.8 · 110 km ENE of Miyako, Japan · 19.3 kmM 4.7 · 151 km E of Miyako, Japan · 50.5 kmM 5.3 · 142 km ENE of Miyako, Japan · 42.8 km
100 km E of Miyako, Japan180 km19 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

34/100
Impact and context →

M4.5+ events in cluster

MagnitudeLocationDepthTime
M 6.0100 km E of Miyako, Japan35.0 km2026-04-20 07:56:49 UTCView event →
M 5.3135 km E of Miyako, Japan31.6 km2026-04-20 08:01:32 UTCView event →
M 5.3117 km E of Yamada, Japan35.0 km2026-04-20 08:02:53 UTCView event →
M 5.4143 km ENE of Miyako, Japan34.9 km2026-04-20 08:03:05 UTCView event →
M 4.690 km ENE of Miyako, Japan30.3 km2026-04-20 08:08:19 UTCView event →
M 4.9114 km ENE of Miyako, Japan35.0 km2026-04-20 08:08:54 UTCView event →
M 4.6118 km E of Miyako, Japan40.1 km2026-04-20 08:14:48 UTCView event →
M 4.6124 km E of Miyako, Japan15.9 km2026-04-20 08:15:19 UTCView event →
M 4.6104 km E of Miyako, Japan31.5 km2026-04-20 08:30:10 UTCView event →
M 5.4111 km E of Miyako, Japan30.1 km2026-04-20 08:32:48 UTCView event →
M 5.4100 km E of Yamada, Japan35.0 km2026-04-20 08:33:36 UTCView event →
M 5.1127 km ENE of Miyako, Japan35.0 km2026-04-20 09:49:44 UTCView event →
M 5.1133 km E of Yamada, Japan10.0 km2026-04-20 10:44:10 UTCView event →
M 4.598 km E of Miyako, Japan31.6 km2026-04-20 11:28:59 UTCView event →
M 5.1118 km E of Yamada, Japan25.6 km2026-04-20 12:56:47 UTCView event →
M 4.7119 km ENE of Miyako, Japan29.5 km2026-04-20 14:15:28 UTCView event →
M 4.5136 km E of Yamada, Japan10.0 km2026-04-20 16:13:12 UTCView event →
M 4.8110 km ENE of Miyako, Japan25.1 km2026-04-21 02:35:46 UTCView event →
M 4.7151 km E of Miyako, Japan10.0 km2026-04-21 05:19:56 UTCView event →
M 5.3142 km ENE of Miyako, Japan10.0 km2026-04-21 05:29:09 UTCView event →
M 5.5121 km E of Noda, Japan16.0 km2026-04-21 18:44:09 UTCView event →
M 5.3111 km ENE of Miyako, Japan35.0 km2026-04-22 00:01:12 UTCView event →
M 4.554 km E of Noda, Japan35.0 km2026-04-22 12:06:22 UTCView event →
M 5.1103 km ENE of Miyako, Japan35.0 km2026-04-22 12:18:35 UTCView event →
M 4.9102 km E of Miyako, Japan35.0 km2026-04-22 13:35:26 UTCView event →
M 4.6100 km ENE of Miyako, Japan35.0 km2026-04-22 14:26:20 UTCView event →
M 4.516 km E of Noda, Japan59.0 km2026-04-22 17:46:39 UTCView event →
M 4.8120 km E of Miyako, Japan34.4 km2026-04-23 00:07:59 UTCView event →
M 5.085 km E of Noda, Japan35.0 km2026-04-24 05:13:10 UTCView event →
M 4.8105 km ENE of Miyako, Japan33.7 km2026-04-25 20:41:31 UTCView event →
M 4.779 km E of Noda, Japan35.0 km2026-04-26 06:43:53 UTCView event →
M 5.077 km E of Noda, Japan35.0 km2026-04-26 16:57:22 UTCView event →
M 4.879 km E of Noda, Japan35.0 km2026-04-28 07:24:46 UTCView event →
M 4.571 km ENE of Noda, Japan41.5 km2026-04-28 10:14:57 UTCView event →
M 4.595 km ENE of Kuji, Japan44.7 km2026-04-30 08:43:19 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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