Explore clusters of M4.5+ events observed around significant earthquakes. These clusters are descriptive and are not presented as earthquake predictions.
After the M 6.6 reference event, Quake Pulse counts 3 M4+ event(s) in the first 24 hours and 6 in the first 7 days. Fourteen-day M4.5+ activity is about 1.1× the average equivalent derived from the previous year. The largest secondary event is M 0.9 below the reference event.
Descriptive comparison with M4.5+ events observed in the same radius during the 365 days before the sequence.
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.
Earlier events are shown as context only. They are not labelled precursors and should not be interpreted as predictive signals.
Shows M4+ cluster events according to elapsed time after the reference event.
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.
2 Felt reports · Tsunami indicator · Very deep
| Magnitude | Location | Depth | Time | |
|---|---|---|---|---|
| M 6.6 | Fiji region | 591.0 km | 2019-09-01 15:54:20 UTC | View event → |
| M 5.0 | 219 km WNW of Pangai, Tonga | 6.4 km | 2019-09-01 16:10:38 UTC | View event → |
| M 5.0 | 183 km WNW of Pangai, Tonga | 10.0 km | 2019-09-01 16:15:41 UTC | View event → |
| M 4.6 | Fiji region | 600.1 km | 2019-09-01 17:18:26 UTC | View event → |
| M 5.7 | 227 km WNW of Pangai, Tonga | 10.0 km | 2019-09-04 09:48:22 UTC | View event → |
| M 5.0 | Fiji region | 10.0 km | 2019-09-04 11:30:01 UTC | View event → |
| M 4.7 | Fiji region | 592.7 km | 2019-09-04 19:27:41 UTC | View event → |
| M 4.6 | Fiji region | 590.7 km | 2019-09-08 22:39:53 UTC | View event → |
| M 4.5 | Fiji region | 549.0 km | 2019-09-11 23:30:01 UTC | View event → |
| M 4.5 | 171 km WSW of Haveluloto, Tonga | 152.0 km | 2019-09-12 07:27:25 UTC | View event → |
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.
Guides, explainers and practical reading to go beyond the live data.
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Early-warning systems detect an earthquake after it starts and try to send an alert before the strongest shaking arrives. The difference between warning and prediction matters.
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