Explore clusters of M4.5+ events observed around significant earthquakes. These clusters are descriptive and are not presented as earthquake predictions.
After the M 7.1 reference event, Quake Pulse counts 13 M4+ event(s) in the first 24 hours and 17 in the first 7 days. Fourteen-day M4.5+ activity is about 36.0× the average equivalent derived from the previous year. The largest secondary event is M 1.3 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.
2,342 Felt reports · PAGER ORANGE · Tsunami indicator · Shallow
| Magnitude | Location | Depth | Time | |
|---|---|---|---|---|
| M 7.1 | 1 km SE of Point MacKenzie, Alaska | 46.7 km | 2018-11-30 17:29:29 UTC | View event → |
| M 4.5 | 4 km NNW of Point MacKenzie, Alaska | 47.0 km | 2018-11-30 17:32:27 UTC | View event → |
| M 4.6 | 5 km SSE of Big Lake, Alaska | 37.2 km | 2018-11-30 17:32:36 UTC | View event → |
| M 5.8 | 7 km NNW of Anchorage, Alaska | 40.8 km | 2018-11-30 17:35:37 UTC | View event → |
| M 4.9 | 7 km N of Anchorage, Alaska | 45.8 km | 2018-11-30 17:36:37 UTC | View event → |
| M 4.5 | 1 km N of Big Lake, Alaska | 43.3 km | 2018-11-30 17:42:59 UTC | View event → |
| M 5.2 | 6 km S of Big Lake, Alaska | 40.2 km | 2018-11-30 18:00:06 UTC | View event → |
| M 4.8 | 1 km NW of Point MacKenzie, Alaska | 39.8 km | 2018-11-30 19:26:29 UTC | View event → |
| M 5.0 | Southern Alaska | 37.7 km | 2018-11-30 20:26:55 UTC | View event → |
| M 4.5 | 7 km WNW of Point MacKenzie, Alaska | 37.4 km | 2018-11-30 20:27:59 UTC | View event → |
| M 4.6 | 1 km N of Point MacKenzie, Alaska | 44.8 km | 2018-12-01 05:31:54 UTC | View event → |
| M 5.0 | 4 km SSE of Big Lake, Alaska | 51.3 km | 2018-12-01 07:07:37 UTC | View event → |
| M 5.1 | 0 km SW of Point MacKenzie, Alaska | 42.9 km | 2018-12-01 07:57:22 UTC | View event → |
| M 4.5 | 6 km SSE of Big Lake, Alaska | 34.4 km | 2018-12-01 12:44:53 UTC | View event → |
| M 4.5 | 5 km SE of Point MacKenzie, Alaska | 51.7 km | 2018-12-02 04:52:15 UTC | View event → |
| M 4.5 | 6 km NW of Point MacKenzie, Alaska | 38.3 km | 2018-12-04 16:02:29 UTC | View event → |
| M 4.5 | 5 km SW of Point MacKenzie, Alaska | 41.8 km | 2018-12-05 12:48:44 UTC | View event → |
| M 4.8 | 2 km SSE of Point MacKenzie, Alaska | 43.2 km | 2018-12-06 21:45:11 UTC | View event → |
| M 4.7 | 7 km SW of Knik, Alaska | 41.2 km | 2018-12-09 19:00:32 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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