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Sequence · 2025-03-30

M 7.0 · Observed seismic cluster · 61 km SSE of Pangai, 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 cluster21
M6+2
Analysis radius340 km
Observation window14 days
Largest secondary eventM 6.2
Quake Pulse · Major sequence

What the sequence shows

After the M 7.0 reference event, Quake Pulse counts 10 M4+ event(s) in the first 24 hours and 20 in the first 7 days. Fourteen-day M4.5+ activity is about 3.0× the average equivalent derived from the previous year. The largest secondary event is M 0.8 below the reference event.

83/100Sequence score
Events in the previous 24 h1
In the first hour1
In the first 24 hours10
In the first 7 days20
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 d190Average 14-day equivalent7.3Activity / baseline ratio3.0×

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 6.2Magnitude gapM 0.8Observed duration12.4 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
61 km SSE of Pangai, Tonga · 340 kmInteractive 3D view of earthquakes within 340 km of 61 km SSE of Pangai, Tonga.61 km SSE of Pangai, TongaM 4.5 · 90 km SE of Pangai, Tonga · 37.7 kmM 4.9 · 68 km SSE of Pangai, Tonga · 14.1 kmM 4.7 · 56 km SE of Pangai, Tonga · 28.5 kmM 6.2 · 72 km SSE of Pangai, Tonga · 10.7 kmM 5.0 · 98 km SE of Pangai, Tonga · 38.8 kmM 5.9 · 53 km SSE of Pangai, Tonga · 8.8 kmM 4.8 · 51 km SSE of Pangai, Tonga · 17.2 kmM 4.6 · 91 km SE of Pangai, Tonga · 34.3 kmM 5.2 · 63 km SE of Pangai, Tonga · 10.6 kmM 4.7 · 100 km SE of Pangai, Tonga · 39.9 km
61 km SSE of Pangai, Tonga340 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

27 Felt reports · PAGER GREEN · Tsunami indicator · Shallow

70/100
Impact and context →

M4.5+ events in cluster

MagnitudeLocationDepthTime
M 7.061 km SSE of Pangai, Tonga29.0 km2025-03-30 12:18:50 UTCView event →
M 4.590 km SE of Pangai, Tonga10.0 km2025-03-30 12:54:46 UTCView event →
M 4.968 km SSE of Pangai, Tonga10.0 km2025-03-30 14:24:47 UTCView event →
M 4.756 km SE of Pangai, Tonga10.0 km2025-03-30 14:58:43 UTCView event →
M 6.272 km SSE of Pangai, Tonga17.0 km2025-03-30 15:04:54 UTCView event →
M 5.098 km SE of Pangai, Tonga10.0 km2025-03-30 15:26:13 UTCView event →
M 5.953 km SSE of Pangai, Tonga27.1 km2025-03-30 15:33:49 UTCView event →
M 4.851 km SSE of Pangai, Tonga10.0 km2025-03-30 16:10:08 UTCView event →
M 4.691 km SE of Pangai, Tonga24.0 km2025-03-30 19:30:25 UTCView event →
M 5.263 km SE of Pangai, Tonga10.0 km2025-03-30 21:51:41 UTCView event →
M 4.7100 km SE of Pangai, Tonga10.0 km2025-03-31 00:23:58 UTCView event →
M 4.9103 km SSE of Pangai, Tonga10.0 km2025-03-31 13:20:43 UTCView event →
M 4.9115 km SE of Pangai, Tonga10.0 km2025-03-31 22:25:56 UTCView event →
M 4.768 km SE of Pangai, Tonga14.0 km2025-04-01 07:37:26 UTCView event →
M 4.990 km SE of Pangai, Tonga10.0 km2025-04-02 00:59:30 UTCView event →
M 4.531 km NE of Fangale’ounga, Tonga10.0 km2025-04-04 12:41:47 UTCView event →
M 4.8115 km SE of ‘Ohonua, Tonga10.0 km2025-04-05 01:57:03 UTCView event →
M 4.5122 km SE of Pangai, Tonga10.0 km2025-04-05 04:19:07 UTCView event →
M 5.192 km ESE of Fangale’ounga, Tonga10.0 km2025-04-05 09:19:55 UTCView event →
M 4.5105 km NNW of Neiafu, Tonga148.9 km2025-04-05 19:49:45 UTCView event →
M 5.0211 km SW of Houma, Tonga216.0 km2025-04-05 21:23:34 UTCView event →
M 4.6296 km WNW of Neiafu, Tonga10.0 km2025-04-06 12:54:04 UTCView event →
M 4.572 km SE of Pangai, Tonga10.0 km2025-04-11 20:59:57 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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