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Sequence · 2015-10-20

M 7.1 · Observed seismic cluster · 31 km NE 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 cluster9
M6+1
Analysis radius356 km
Observation window14 days
Largest secondary eventM 4.8
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Sequence timeline

Within first 24 hours6
Within first 7 days7
Observed duration12.1 d
Gap from reference eventM 2.3
0 h12.1 d
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Main-event impact

8 Felt reports · PAGER GREEN · Tsunami indicator · Intermediate

67/100
Impact and context →

M4.5+ events in cluster

MagnitudeLocationDepthTime
M 7.131 km NE of Port-Olry, Vanuatu135.0 km2015-10-20 21:52:02 UTCView event →
M 4.661 km ENE of Port-Olry, Vanuatu126.2 km2015-10-20 22:25:40 UTCView event →
M 4.735 km ENE of Port-Olry, Vanuatu121.4 km2015-10-20 22:31:09 UTCView event →
M 4.640 km ENE of Port-Olry, Vanuatu126.6 km2015-10-21 04:22:27 UTCView event →
M 4.648 km NE of Port-Olry, Vanuatu140.4 km2015-10-21 07:56:09 UTCView event →
M 4.834 km NE of Port-Olry, Vanuatu134.8 km2015-10-21 21:26:35 UTCView event →
M 4.589 km NW of Sola, Vanuatu188.0 km2015-10-23 22:28:27 UTCView event →
M 4.872 km NE of Norsup, Vanuatu120.7 km2015-10-30 21:43:40 UTCView event →
M 4.5188 km NNW of Sola, Vanuatu214.0 km2015-11-02 00:57:33 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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