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Sequence · 2026-03-22

M 6.3 · Observed seismic cluster · 140 km ENE of Hihifo, Tonga

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 cluster23
M6+1
Analysis radius228 km
Observation window14 days
Largest secondary eventM 5.9
Quake Pulse · Strong sequence

What the sequence shows

After the M 6.3 reference event, Quake Pulse counts 6 M4+ event(s) in the first 24 hours and 18 in the first 7 days. Fourteen-day M4.5+ activity is about 6.9× the average equivalent derived from the previous year. The largest secondary event is M 0.4 below the reference event.

72/100Sequence score
Events in the previous 24 h4
In the first hour2
In the first 24 hours6
In the first 7 days18
Within 14 days22
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 d83Average 14-day equivalent3.2Activity / baseline ratio6.9×

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 5.9Magnitude gapM 0.4Observed duration13.8 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
140 km ENE of Hihifo, Tonga · 228 kmInteractive 3D view of earthquakes within 228 km of 140 km ENE of Hihifo, Tonga.140 km ENE of Hihifo, TongaM 5.6 · 135 km NE of Hihifo, Tonga · 62.2 kmM 4.8 · 136 km NE of Hihifo, Tonga · 54.3 kmM 5.9 · 110 km ENE of Hihifo, Tonga · 37.2 kmM 5.7 · 106 km ENE of Hihifo, Tonga · 35.0 kmM 5.0 · 125 km NE of Hihifo, Tonga · 20.4 kmM 4.6 · 112 km NE of Hihifo, Tonga · 37.2 km
140 km ENE of Hihifo, Tonga228 km6 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

40/100
Impact and context →

M4.5+ events in cluster

MagnitudeLocationDepthTime
M 6.3140 km ENE of Hihifo, Tonga12.0 km2026-03-22 15:30:36 UTCView event →
M 5.6135 km NE of Hihifo, Tonga10.0 km2026-03-22 16:00:18 UTCView event →
M 4.8136 km NE of Hihifo, Tonga10.0 km2026-03-22 16:23:11 UTCView event →
M 5.9110 km ENE of Hihifo, Tonga13.0 km2026-03-22 22:26:14 UTCView event →
M 5.7106 km ENE of Hihifo, Tonga10.0 km2026-03-23 06:02:46 UTCView event →
M 5.0125 km NE of Hihifo, Tonga10.0 km2026-03-23 08:44:28 UTCView event →
M 4.6112 km NE of Hihifo, Tonga10.0 km2026-03-23 11:58:49 UTCView event →
M 4.678 km ENE of Hihifo, Tonga10.0 km2026-03-23 23:07:03 UTCView event →
M 4.990 km E of Hihifo, Tonga10.0 km2026-03-24 00:30:04 UTCView event →
M 5.686 km WNW of Hihifo, Tonga204.0 km2026-03-25 10:11:01 UTCView event →
M 5.099 km WNW of Hihifo, Tonga208.2 km2026-03-25 10:12:18 UTCView event →
M 4.991 km WNW of Hihifo, Tonga184.3 km2026-03-25 10:17:28 UTCView event →
M 5.2115 km E of Hihifo, Tonga10.0 km2026-03-27 23:35:10 UTCView event →
M 4.682 km E of Hihifo, Tonga10.0 km2026-03-28 00:15:46 UTCView event →
M 4.573 km E of Hihifo, Tonga10.0 km2026-03-28 01:15:31 UTCView event →
M 4.568 km ENE of Hihifo, Tonga10.0 km2026-03-28 02:18:49 UTCView event →
M 4.882 km NE of Hihifo, Tonga10.0 km2026-03-28 10:16:55 UTCView event →
M 4.6116 km NE of Hihifo, Tonga10.0 km2026-03-28 23:30:06 UTCView event →
M 4.6103 km NE of Hihifo, Tonga10.0 km2026-03-29 06:31:06 UTCView event →
M 5.264 km SSE of Hihifo, Tonga44.7 km2026-03-29 23:45:13 UTCView event →
M 4.5114 km E of Hihifo, Tonga10.0 km2026-04-01 07:04:44 UTCView event →
M 4.9111 km S of Hihifo, Tonga65.5 km2026-04-03 02:50:02 UTCView event →
M 4.580 km ESE of Hihifo, Tonga35.0 km2026-04-05 11:35:54 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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