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Sequence · 2016-07-29

M 7.7 · Observed seismic cluster · Pagan region, Northern Mariana Islands

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 cluster28
M6+1
Analysis radius452 km
Observation window14 days
Largest secondary eventM 5.6
Quake Pulse · Major sequence

What the sequence shows

After the M 7.7 reference event, Quake Pulse counts 13 M4+ event(s) in the first 24 hours and 22 in the first 7 days. Fourteen-day M4.5+ activity is about 6.5× the average equivalent derived from the previous year. The largest secondary event is M 2.1 below the reference event.

92/100Sequence score
Events in the previous 24 h0
In the first hour6
In the first 24 hours13
In the first 7 days22
Within 14 days27
Peak one-hour count6

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 d109Average 14-day equivalent4.2Activity / baseline ratio6.5×

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 5.6Magnitude gapM 2.1Observed 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.

1 hour24 hours7 days14 days
Pagan region, Northern Mariana Islands · 452 kmInteractive 3D view of earthquakes within 452 km of Pagan region, Northern Mariana Islands.Pagan region, Northern Mariana IslandsM 5.6 · Pagan region, Northern Mariana Islands · 23.8 kmM 5.3 · Pagan region, Northern Mariana Islands · 48.0 kmM 4.8 · Pagan region, Northern Mariana Islands · 31.4 kmM 4.7 · Pagan region, Northern Mariana Islands · 16.2 kmM 4.7 · Pagan region, Northern Mariana Islands · 74.8 kmM 4.7 · Pagan region, Northern Mariana Islands · 25.2 kmM 4.9 · Pagan region, Northern Mariana Islands · 17.5 kmM 4.5 · Pagan region, Northern Mariana Islands · 14.8 kmM 4.5 · Pagan region, Northern Mariana Islands · 15.2 kmM 4.5 · Pagan region, Northern Mariana Islands · 29.3 kmM 4.5 · Pagan region, Northern Mariana Islands · 15.7 kmM 4.6 · Pagan region, Northern Mariana Islands · 19.3 kmM 4.5 · Pagan region, Northern Mariana Islands · 26.8 km
Pagan region, Northern Mariana Islands452 km13 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

129 Felt reports · PAGER GREEN · Tsunami indicator · Intermediate

73/100
Impact and context →

M4.5+ events in cluster

MagnitudeLocationDepthTime
M 7.7Pagan region, Northern Mariana Islands196.0 km2016-07-29 21:18:24 UTCView event →
M 5.6Pagan region, Northern Mariana Islands187.8 km2016-07-29 21:26:59 UTCView event →
M 5.3Pagan region, Northern Mariana Islands206.3 km2016-07-29 21:28:50 UTCView event →
M 4.8Pagan region, Northern Mariana Islands197.6 km2016-07-29 21:39:19 UTCView event →
M 4.7Pagan region, Northern Mariana Islands194.3 km2016-07-29 21:45:23 UTCView event →
M 4.7Pagan region, Northern Mariana Islands207.5 km2016-07-29 21:47:22 UTCView event →
M 4.7Pagan region, Northern Mariana Islands196.7 km2016-07-29 22:05:46 UTCView event →
M 4.9Pagan region, Northern Mariana Islands204.0 km2016-07-29 22:18:29 UTCView event →
M 4.5Pagan region, Northern Mariana Islands193.4 km2016-07-29 22:27:23 UTCView event →
M 4.5Pagan region, Northern Mariana Islands187.4 km2016-07-29 23:42:43 UTCView event →
M 4.5Pagan region, Northern Mariana Islands204.1 km2016-07-30 09:38:41 UTCView event →
M 4.5Pagan region, Northern Mariana Islands166.1 km2016-07-30 12:25:28 UTCView event →
M 4.6Pagan region, Northern Mariana Islands179.0 km2016-07-30 13:22:21 UTCView event →
M 4.5Pagan region, Northern Mariana Islands181.4 km2016-07-30 18:18:51 UTCView event →
M 4.9Pagan region, Northern Mariana Islands208.4 km2016-07-30 22:28:19 UTCView event →
M 4.5Pagan region, Northern Mariana Islands195.0 km2016-07-31 05:35:21 UTCView event →
M 4.5Pagan region, Northern Mariana Islands187.3 km2016-07-31 15:25:38 UTCView event →
M 4.6Pagan region, Northern Mariana Islands207.2 km2016-07-31 23:57:05 UTCView event →
M 4.6272 km NE of Saipan, Northern Mariana Islands52.7 km2016-08-01 02:36:22 UTCView event →
M 4.5Pagan region, Northern Mariana Islands212.0 km2016-08-02 18:40:04 UTCView event →
M 4.5Pagan region, Northern Mariana Islands217.8 km2016-08-03 11:37:16 UTCView event →
M 4.5Pagan region, Northern Mariana Islands193.5 km2016-08-03 16:29:01 UTCView event →
M 4.5Pagan region, Northern Mariana Islands191.3 km2016-08-04 12:16:13 UTCView event →
M 5.1Pagan region, Northern Mariana Islands196.4 km2016-08-08 18:11:04 UTCView event →
M 4.5Pagan region, Northern Mariana Islands192.2 km2016-08-09 00:36:01 UTCView event →
M 4.8Pagan region, Northern Mariana Islands129.0 km2016-08-09 15:34:05 UTCView event →
M 4.8Pagan region, Northern Mariana Islands205.5 km2016-08-10 14:58:21 UTCView event →
M 4.6Pagan region, Northern Mariana Islands57.8 km2016-08-12 06:19:18 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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