Sequence · 2023-03-02

M 6.5 · Observed seismic cluster · 83 km WSW of Port-Olry, Vanuatu

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 cluster29
M6+1
Analysis radius260 km
Observation window14 days
Largest secondary eventM 5.7
Quake Pulse · Major sequence

What the sequence shows

After the M 6.5 reference event, Quake Pulse counts 20 M4+ event(s) in the first 24 hours and 24 in the first 7 days. Fourteen-day M4.5+ activity is about 4.8× the average equivalent derived from the previous year. The largest secondary event is M 0.8 below the reference event.

75/100Sequence score
Events in the previous 24 h1
In the first hour10
In the first 24 hours20
In the first 7 days24
Within 14 days28
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 d152Average 14-day equivalent5.8Activity / baseline ratio4.8×

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 0.8Observed duration13.4 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.

Detailed timeline

Dots represent M4+ events retained by the sequence detector. Dot size depends on magnitude.

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

4 Felt reports · PAGER GREEN · Tsunami indicator · Shallow

58/100
Impact and context →

M4.5+ events in cluster

MagnitudeLocationDepthTime
M 6.583 km WSW of Port-Olry, Vanuatu17.0 km2023-03-02 18:04:30 UTCView event →
M 5.753 km W of Port-Olry, Vanuatu10.0 km2023-03-02 18:05:31 UTCView event →
M 5.245 km W of Port-Olry, Vanuatu10.0 km2023-03-02 18:10:32 UTCView event →
M 5.245 km WNW of Port-Olry, Vanuatu10.0 km2023-03-02 18:11:07 UTCView event →
M 4.764 km WSW of Port-Olry, Vanuatu10.0 km2023-03-02 18:14:42 UTCView event →
M 4.7Vanuatu10.0 km2023-03-02 18:17:05 UTCView event →
M 4.864 km WNW of Port-Olry, Vanuatu10.0 km2023-03-02 18:33:37 UTCView event →
M 4.761 km W of Port-Olry, Vanuatu10.0 km2023-03-02 18:40:44 UTCView event →
M 4.650 km WNW of Port-Olry, Vanuatu10.0 km2023-03-02 18:50:08 UTCView event →
M 4.562 km WNW of Port-Olry, Vanuatu10.0 km2023-03-02 18:52:21 UTCView event →
M 4.742 km WNW of Port-Olry, Vanuatu10.0 km2023-03-02 18:54:07 UTCView event →
M 4.8Vanuatu10.0 km2023-03-02 19:05:05 UTCView event →
M 4.959 km WNW of Port-Olry, Vanuatu10.0 km2023-03-02 19:32:27 UTCView event →
M 4.6Vanuatu10.0 km2023-03-02 20:12:53 UTCView event →
M 4.647 km WNW of Port-Olry, Vanuatu10.0 km2023-03-02 20:53:46 UTCView event →
M 5.141 km WNW of Port-Olry, Vanuatu12.9 km2023-03-02 20:55:29 UTCView event →
M 4.637 km WNW of Port-Olry, Vanuatu10.0 km2023-03-02 21:06:57 UTCView event →
M 4.6Vanuatu28.8 km2023-03-02 21:45:20 UTCView event →
M 4.646 km NW of Port-Olry, Vanuatu10.0 km2023-03-02 23:05:11 UTCView event →
M 5.362 km WNW of Port-Olry, Vanuatu10.0 km2023-03-03 00:54:27 UTCView event →
M 4.559 km NW of Port-Olry, Vanuatu10.0 km2023-03-03 08:43:32 UTCView event →
M 4.650 km NNW of Port-Olry, Vanuatu21.0 km2023-03-05 01:46:03 UTCView event →
M 5.011 km SE of Port-Olry, Vanuatu75.4 km2023-03-07 01:14:01 UTCView event →
M 4.555 km WNW of Port-Olry, Vanuatu10.0 km2023-03-08 14:07:14 UTCView event →
M 4.8Vanuatu10.0 km2023-03-08 22:14:34 UTCView event →
M 4.637 km ENE of Port-Olry, Vanuatu120.7 km2023-03-11 17:17:29 UTCView event →
M 4.573 km E of Luganville, Vanuatu128.6 km2023-03-11 21:26:23 UTCView event →
M 4.994 km NW of Sola, Vanuatu183.3 km2023-03-15 00:36:46 UTCView event →
M 4.5112 km SSW of Lakatoro, Vanuatu10.0 km2023-03-16 03:18:27 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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