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Sequence · 2026-03-24

M 7.5 · Observed seismic cluster · 158 km W of Neiafu, 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 cluster27
M6+1
Analysis radius420 km
Observation window14 days
Largest secondary eventM 5.6
Quake Pulse · Major sequence

What the sequence shows

After the M 7.5 reference event, Quake Pulse counts 8 M4+ event(s) in the first 24 hours and 21 in the first 7 days. Fourteen-day M4.5+ activity is about 2.4× the average equivalent derived from the previous year. The largest secondary event is M 1.8 below the reference event.

81/100Sequence score
Events in the previous 24 h5
In the first hour3
In the first 24 hours8
In the first 7 days21
Within 14 days31
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 d339Average 14-day equivalent13.0Activity / baseline ratio2.4×

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 5.7Magnitude gapM 1.8Observed duration12.3 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
158 km W of Neiafu, Tonga · 420 kmInteractive 3D view of earthquakes within 420 km of 158 km W of Neiafu, Tonga.158 km W of Neiafu, TongaM 5.0 · 135 km WNW of Neiafu, Tonga · 33.5 kmM 5.0 · 138 km WNW of Neiafu, Tonga · 50.7 kmM 5.1 · 152 km W of Neiafu, Tonga · 12.0 kmM 4.6 · 147 km WNW of Neiafu, Tonga · 39.9 kmM 4.6 · 163 km W of Neiafu, Tonga · 5.8 kmM 4.6 · 249 km E of Levuka, Fiji · 317.7 kmM 4.6 · 179 km W of Neiafu, Tonga · 22.9 kmM 5.0 · 158 km W of Neiafu, Tonga · 8.0 km
158 km W of Neiafu, Tonga420 km8 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

19 Felt reports · PAGER GREEN · Intermediate

58/100
Impact and context →

M4.5+ events in cluster

MagnitudeLocationDepthTime
M 7.5158 km W of Neiafu, Tonga234.0 km2026-03-24 04:37:51 UTCView event →
M 5.0135 km WNW of Neiafu, Tonga213.3 km2026-03-24 04:51:06 UTCView event →
M 5.0138 km WNW of Neiafu, Tonga222.9 km2026-03-24 05:18:32 UTCView event →
M 5.1152 km W of Neiafu, Tonga208.7 km2026-03-24 05:22:23 UTCView event →
M 4.6147 km WNW of Neiafu, Tonga235.8 km2026-03-24 05:51:22 UTCView event →
M 4.6163 km W of Neiafu, Tonga190.7 km2026-03-24 06:45:57 UTCView event →
M 4.6249 km E of Levuka, Fiji575.9 km2026-03-24 14:04:13 UTCView event →
M 4.6179 km W of Neiafu, Tonga272.1 km2026-03-24 21:57:36 UTCView event →
M 5.0158 km W of Neiafu, Tonga211.8 km2026-03-25 02:24:40 UTCView event →
M 4.6166 km W of Neiafu, Tonga223.7 km2026-03-25 07:35:08 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 4.5168 km W of Neiafu, Tonga192.8 km2026-03-30 14:34:20 UTCView event →
M 4.5291 km WNW of Houma, Tonga520.5 km2026-03-31 09:32:55 UTCView event →
M 4.7289 km WNW of Houma, Tonga547.7 km2026-03-31 17:09:02 UTCView event →
M 5.7Fiji region596.5 km2026-04-01 06:08:27 UTCView event →
M 4.5114 km E of Hihifo, Tonga10.0 km2026-04-01 07:04:44 UTCView event →
M 4.9Fiji region590.6 km2026-04-01 23:44:35 UTCView event →
M 4.6247 km WNW of Houma, Tonga543.8 km2026-04-01 23:49:37 UTCView event →
M 4.5227 km ENE of Neiafu, Tonga10.0 km2026-04-02 12:07:23 UTCView event →
M 4.9111 km S of Hihifo, Tonga65.5 km2026-04-03 02:50:02 UTCView event →
M 4.684 km WSW of Neiafu, Tonga79.3 km2026-04-04 08:33:48 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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