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Sequence · 2007-01-21

M 7.5 · Observed seismic cluster · 126 km WNW of Ternate, Indonesia

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 cluster137
M6+2
Analysis radius420 km
Observation window14 days
Largest secondary eventM 6.2
Quake Pulse · Major sequence

What the sequence shows

After the M 7.5 reference event, Quake Pulse counts 74 M4+ event(s) in the first 24 hours and 115 in the first 7 days. Fourteen-day M4.5+ activity is about 15.2× the average equivalent derived from the previous year. The largest secondary event is M 1.3 below the reference event.

92/100Sequence score
Events in the previous 24 h0
In the first hour10
In the first 24 hours74
In the first 7 days115
Within 14 days137
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 d235Average 14-day equivalent9.0Activity / baseline ratio15.2×

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 6.2Magnitude gapM 1.3Observed duration13.8 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
126 km WNW of Ternate, Indonesia · 420 kmInteractive 3D view of earthquakes within 420 km of 126 km WNW of Ternate, Indonesia.126 km WNW of Ternate, IndonesiaM 5.4 · 114 km ESE of Tondano, Indonesia · 43.4 kmM 5.3 · 130 km WNW of Ternate, Indonesia · 8.5 kmM 5.6 · 115 km ESE of Tondano, Indonesia · 45.5 kmM 5.2 · 132 km ESE of Laikit, Laikit II (Dimembe), Indonesia · 20.0 kmM 4.9 · 134 km ESE of Laikit, Laikit II (Dimembe), Indonesia · 18.5 kmM 5.2 · 131 km ESE of Tondano, Indonesia · 25.5 kmM 4.8 · 118 km ESE of Laikit, Laikit II (Dimembe), Indonesia · 34.5 kmM 4.9 · 117 km ESE of Laikit, Laikit II (Dimembe), Indonesia · 37.9 kmM 5.1 · 139 km ESE of Tondano, Indonesia · 22.0 kmM 4.5 · 87 km W of Ternate, Indonesia · 40.0 kmM 5.5 · 124 km ESE of Laikit, Laikit II (Dimembe), Indonesia · 28.7 kmM 4.7 · 120 km WNW of Ternate, Indonesia · 7.7 kmM 4.9 · 130 km ESE of Laikit, Laikit II (Dimembe), Indonesia · 22.5 kmM 5.0 · 141 km W of Ternate, Indonesia · 27.5 kmM 4.8 · 137 km ESE of Laikit, Laikit II (Dimembe), Indonesia · 16.9 kmM 5.1 · 126 km ESE of Tondano, Indonesia · 31.6 kmM 4.7 · 128 km ESE of Tondano, Indonesia · 28.9 kmM 5.0 · 110 km WNW of Ternate, Indonesia · 19.2 kmM 5.1 · 132 km W of Ternate, Indonesia · 14.4 kmM 5.4 · 114 km WNW of Ternate, Indonesia · 14.3 kmM 4.9 · 134 km ESE of Laikit, Laikit II (Dimembe), Indonesia · 19.2 kmM 5.1 · 132 km WNW of Ternate, Indonesia · 22.4 kmM 4.9 · 129 km ESE of Laikit, Laikit II (Dimembe), Indonesia · 25.4 kmM 4.5 · 128 km ESE of Tondano, Indonesia · 31.8 kmM 5.4 · 128 km ESE of Tondano, Indonesia · 36.3 kmM 5.0 · 117 km ESE of Laikit, Laikit II (Dimembe), Indonesia · 36.0 kmM 5.5 · 121 km ESE of Tondano, Indonesia · 34.9 kmM 5.3 · 118 km ESE of Tondano, Indonesia · 39.7 kmM 5.1 · 130 km ESE of Tondano, Indonesia · 27.1 kmM 5.1 · 138 km WNW of Ternate, Indonesia · 12.4 kmM 4.6 · 104 km WNW of Ternate, Indonesia · 25.0 kmM 4.7 · 132 km ESE of Laikit, Laikit II (Dimembe), Indonesia · 21.4 kmM 4.8 · 130 km ESE of Tondano, Indonesia · 32.9 kmM 4.8 · 122 km ESE of Tondano, Indonesia · 33.5 kmM 6.2 · 119 km WNW of Ternate, Indonesia · 7.0 kmM 4.9 · 117 km WNW of Ternate, Indonesia · 10.2 kmM 5.2 · 112 km WNW of Ternate, Indonesia · 13.8 kmM 4.8 · 129 km WNW of Ternate, Indonesia · 4.0 kmM 4.5 · 109 km WNW of Ternate, Indonesia · 19.1 kmM 4.9 · 123 km W of Ternate, Indonesia · 8.7 kmM 4.6 · 114 km WNW of Ternate, Indonesia · 12.7 kmM 4.7 · 121 km ESE of Laikit, Laikit II (Dimembe), Indonesia · 32.4 kmM 4.7 · 113 km ESE of Tondano, Indonesia · 42.3 kmM 4.8 · 109 km W of Ternate, Indonesia · 20.5 kmM 5.5 · 108 km ESE of Tondano, Indonesia · 48.2 kmM 5.2 · 121 km WNW of Ternate, Indonesia · 6.8 kmM 4.6 · 109 km WNW of Ternate, Indonesia · 22.8 kmM 5.0 · 63 km NNW of Ternate, Indonesia · 107.2 kmM 5.0 · 122 km WNW of Ternate, Indonesia · 7.4 kmM 5.3 · 110 km ESE of Laikit, Laikit II (Dimembe), Indonesia · 44.8 kmM 4.5 · 120 km WNW of Ternate, Indonesia · 14.4 kmM 5.0 · 122 km ESE of Tondano, Indonesia · 34.6 kmM 4.5 · 110 km WNW of Ternate, Indonesia · 26.5 kmM 5.1 · 124 km W of Ternate, Indonesia · 8.9 kmM 4.6 · 95 km ESE of Tondano, Indonesia · 69.9 kmM 4.9 · 138 km ESE of Tondano, Indonesia · 22.0 kmM 4.7 · 118 km ESE of Tondano, Indonesia · 39.2 kmM 4.9 · 129 km ESE of Tondano, Indonesia · 30.6 kmM 5.5 · 127 km WNW of Ternate, Indonesia · 4.9 kmM 4.7 · 125 km WNW of Ternate, Indonesia · 1.7 kmM 5.4 · 137 km ESE of Tondano, Indonesia · 25.1 kmM 4.5 · 87 km WNW of Ternate, Indonesia · 47.1 kmM 5.0 · 134 km ESE of Tondano, Indonesia · 27.3 kmM 5.2 · 126 km W of Ternate, Indonesia · 9.8 kmM 4.6 · 130 km WNW of Ternate, Indonesia · 3.7 kmM 4.6 · 138 km WNW of Ternate, Indonesia · 23.2 kmM 4.7 · 111 km WNW of Ternate, Indonesia · 37.8 kmM 4.9 · 112 km WNW of Ternate, Indonesia · 31.8 kmM 4.9 · 129 km ESE of Laikit, Laikit II (Dimembe), Indonesia · 24.9 kmM 4.5 · 124 km ESE of Tondano, Indonesia · 35.9 kmM 4.6 · 112 km WNW of Ternate, Indonesia · 14.7 kmM 4.7 · 110 km WNW of Ternate, Indonesia · 16.5 kmM 4.7 · 134 km ESE of Tondano, Indonesia · 27.3 kmM 4.8 · 137 km WNW of Ternate, Indonesia · 11.4 km
126 km WNW of Ternate, Indonesia420 km74 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

13 Felt reports · Shallow

59/100
Impact and context →

M4.5+ events in cluster

MagnitudeLocationDepthTime
M 7.5126 km WNW of Ternate, Indonesia22.0 km2007-01-21 11:27:45 UTCView event →
M 5.4114 km ESE of Tondano, Indonesia10.0 km2007-01-21 11:45:59 UTCView event →
M 5.3130 km WNW of Ternate, Indonesia10.0 km2007-01-21 11:47:33 UTCView event →
M 5.6115 km ESE of Tondano, Indonesia10.0 km2007-01-21 11:54:11 UTCView event →
M 5.2132 km ESE of Laikit, Laikit II (Dimembe), Indonesia10.0 km2007-01-21 12:02:08 UTCView event →
M 4.9134 km ESE of Laikit, Laikit II (Dimembe), Indonesia10.0 km2007-01-21 12:08:24 UTCView event →
M 5.2131 km ESE of Tondano, Indonesia10.0 km2007-01-21 12:10:45 UTCView event →
M 4.8118 km ESE of Laikit, Laikit II (Dimembe), Indonesia10.0 km2007-01-21 12:16:02 UTCView event →
M 4.9117 km ESE of Laikit, Laikit II (Dimembe), Indonesia10.0 km2007-01-21 12:17:19 UTCView event →
M 5.1139 km ESE of Tondano, Indonesia10.0 km2007-01-21 12:18:07 UTCView event →
M 4.587 km W of Ternate, Indonesia10.0 km2007-01-21 12:21:11 UTCView event →
M 5.5124 km ESE of Laikit, Laikit II (Dimembe), Indonesia10.0 km2007-01-21 12:32:35 UTCView event →
M 4.7120 km WNW of Ternate, Indonesia10.0 km2007-01-21 12:50:12 UTCView event →
M 4.9130 km ESE of Laikit, Laikit II (Dimembe), Indonesia10.0 km2007-01-21 12:56:05 UTCView event →
M 5.0141 km W of Ternate, Indonesia10.0 km2007-01-21 13:08:32 UTCView event →
M 4.8137 km ESE of Laikit, Laikit II (Dimembe), Indonesia10.0 km2007-01-21 13:12:26 UTCView event →
M 5.1126 km ESE of Tondano, Indonesia10.0 km2007-01-21 13:15:07 UTCView event →
M 4.7128 km ESE of Tondano, Indonesia10.0 km2007-01-21 13:18:10 UTCView event →
M 5.0110 km WNW of Ternate, Indonesia10.0 km2007-01-21 13:21:56 UTCView event →
M 5.1132 km W of Ternate, Indonesia10.0 km2007-01-21 13:43:52 UTCView event →
M 5.4114 km WNW of Ternate, Indonesia10.0 km2007-01-21 13:55:16 UTCView event →
M 4.9134 km ESE of Laikit, Laikit II (Dimembe), Indonesia10.0 km2007-01-21 14:10:34 UTCView event →
M 5.1132 km WNW of Ternate, Indonesia10.0 km2007-01-21 14:11:40 UTCView event →
M 4.9129 km ESE of Laikit, Laikit II (Dimembe), Indonesia10.0 km2007-01-21 14:14:07 UTCView event →
M 4.5128 km ESE of Tondano, Indonesia10.0 km2007-01-21 14:22:40 UTCView event →
M 5.4128 km ESE of Tondano, Indonesia10.0 km2007-01-21 14:27:49 UTCView event →
M 5.0117 km ESE of Laikit, Laikit II (Dimembe), Indonesia10.0 km2007-01-21 14:35:54 UTCView event →
M 5.5121 km ESE of Tondano, Indonesia10.0 km2007-01-21 14:39:18 UTCView event →
M 5.3118 km ESE of Tondano, Indonesia10.0 km2007-01-21 15:04:11 UTCView event →
M 5.1130 km ESE of Tondano, Indonesia10.0 km2007-01-21 15:12:36 UTCView event →
M 5.1138 km WNW of Ternate, Indonesia10.0 km2007-01-21 15:29:17 UTCView event →
M 4.6104 km WNW of Ternate, Indonesia10.0 km2007-01-21 15:33:19 UTCView event →
M 4.7132 km ESE of Laikit, Laikit II (Dimembe), Indonesia10.0 km2007-01-21 16:23:22 UTCView event →
M 4.8130 km ESE of Tondano, Indonesia10.0 km2007-01-21 16:32:55 UTCView event →
M 4.8122 km ESE of Tondano, Indonesia10.0 km2007-01-21 16:59:25 UTCView event →
M 6.2119 km WNW of Ternate, Indonesia23.0 km2007-01-21 17:32:55 UTCView event →
M 4.9117 km WNW of Ternate, Indonesia10.0 km2007-01-21 17:36:13 UTCView event →
M 5.2112 km WNW of Ternate, Indonesia10.0 km2007-01-21 17:37:11 UTCView event →
M 4.8129 km WNW of Ternate, Indonesia10.0 km2007-01-21 17:46:50 UTCView event →
M 4.5109 km WNW of Ternate, Indonesia10.0 km2007-01-21 18:03:34 UTCView event →
M 4.9123 km W of Ternate, Indonesia10.0 km2007-01-21 18:03:42 UTCView event →
M 4.6114 km WNW of Ternate, Indonesia10.0 km2007-01-21 18:27:42 UTCView event →
M 4.7121 km ESE of Laikit, Laikit II (Dimembe), Indonesia10.0 km2007-01-21 18:34:08 UTCView event →
M 4.7113 km ESE of Tondano, Indonesia10.0 km2007-01-21 18:42:12 UTCView event →
M 4.8109 km W of Ternate, Indonesia10.0 km2007-01-21 19:00:17 UTCView event →
M 5.5108 km ESE of Tondano, Indonesia10.0 km2007-01-21 19:50:50 UTCView event →
M 5.2121 km WNW of Ternate, Indonesia10.0 km2007-01-21 19:59:50 UTCView event →
M 4.6109 km WNW of Ternate, Indonesia10.0 km2007-01-21 20:26:42 UTCView event →
M 5.063 km NNW of Ternate, Indonesia10.0 km2007-01-21 20:27:20 UTCView event →
M 5.0122 km WNW of Ternate, Indonesia10.0 km2007-01-21 20:52:39 UTCView event →
M 5.3110 km ESE of Laikit, Laikit II (Dimembe), Indonesia10.0 km2007-01-21 21:03:01 UTCView event →
M 4.5120 km WNW of Ternate, Indonesia10.0 km2007-01-21 21:07:38 UTCView event →
M 5.0122 km ESE of Tondano, Indonesia10.0 km2007-01-21 21:21:42 UTCView event →
M 4.5110 km WNW of Ternate, Indonesia10.0 km2007-01-21 21:53:54 UTCView event →
M 5.1124 km W of Ternate, Indonesia10.0 km2007-01-21 22:21:15 UTCView event →
M 4.695 km ESE of Tondano, Indonesia10.0 km2007-01-21 22:35:13 UTCView event →
M 4.9138 km ESE of Tondano, Indonesia10.0 km2007-01-21 22:44:10 UTCView event →
M 4.7118 km ESE of Tondano, Indonesia10.0 km2007-01-21 22:46:38 UTCView event →
M 4.9129 km ESE of Tondano, Indonesia10.0 km2007-01-21 23:13:15 UTCView event →
M 5.5127 km WNW of Ternate, Indonesia10.0 km2007-01-21 23:45:09 UTCView event →
M 4.7125 km WNW of Ternate, Indonesia10.0 km2007-01-21 23:54:29 UTCView event →
M 5.4137 km ESE of Tondano, Indonesia10.0 km2007-01-22 00:22:51 UTCView event →
M 4.587 km WNW of Ternate, Indonesia10.0 km2007-01-22 00:32:40 UTCView event →
M 5.0134 km ESE of Tondano, Indonesia10.0 km2007-01-22 00:33:19 UTCView event →
M 5.2126 km W of Ternate, Indonesia10.0 km2007-01-22 01:06:40 UTCView event →
M 4.6130 km WNW of Ternate, Indonesia10.0 km2007-01-22 01:28:39 UTCView event →
M 4.6138 km WNW of Ternate, Indonesia10.0 km2007-01-22 02:04:25 UTCView event →
M 4.7111 km WNW of Ternate, Indonesia10.0 km2007-01-22 02:53:11 UTCView event →
M 4.9112 km WNW of Ternate, Indonesia10.0 km2007-01-22 03:25:47 UTCView event →
M 4.9129 km ESE of Laikit, Laikit II (Dimembe), Indonesia10.0 km2007-01-22 05:19:15 UTCView event →
M 4.5124 km ESE of Tondano, Indonesia10.0 km2007-01-22 06:10:19 UTCView event →
M 4.6112 km WNW of Ternate, Indonesia10.0 km2007-01-22 07:04:58 UTCView event →
M 4.7110 km WNW of Ternate, Indonesia10.0 km2007-01-22 08:04:25 UTCView event →
M 4.7134 km ESE of Tondano, Indonesia10.0 km2007-01-22 08:27:47 UTCView event →
M 4.8137 km WNW of Ternate, Indonesia10.0 km2007-01-22 08:42:06 UTCView event →
M 5.0129 km ESE of Tondano, Indonesia10.0 km2007-01-22 12:35:21 UTCView event →
M 4.7129 km ESE of Tondano, Indonesia10.0 km2007-01-22 15:35:06 UTCView event →
M 5.3134 km WSW of Ternate, Indonesia10.0 km2007-01-22 16:44:50 UTCView event →
M 5.2119 km WNW of Ternate, Indonesia10.0 km2007-01-22 18:14:44 UTCView event →
M 4.5115 km ESE of Tondano, Indonesia10.0 km2007-01-22 20:28:38 UTCView event →
M 4.7132 km WNW of Ternate, Indonesia10.0 km2007-01-22 22:17:53 UTCView event →
M 4.7129 km WSW of Ternate, Indonesia10.0 km2007-01-23 11:33:09 UTCView event →
M 5.5124 km ESE of Laikit, Laikit II (Dimembe), Indonesia10.0 km2007-01-23 11:44:41 UTCView event →
M 4.8140 km WNW of Ternate, Indonesia10.0 km2007-01-23 12:02:58 UTCView event →
M 4.5132 km E of Laikit, Laikit II (Dimembe), Indonesia10.0 km2007-01-23 17:30:02 UTCView event →
M 5.0144 km NW of Amahai, Indonesia35.0 km2007-01-24 01:53:30 UTCView event →
M 4.5136 km ESE of Laikit, Laikit II (Dimembe), Indonesia10.0 km2007-01-24 06:59:05 UTCView event →
M 5.6121 km ESE of Tondano, Indonesia10.0 km2007-01-24 08:40:27 UTCView event →
M 5.4132 km ESE of Laikit, Laikit II (Dimembe), Indonesia19.8 km2007-01-24 09:34:31 UTCView event →
M 4.6118 km WNW of Ternate, Indonesia10.0 km2007-01-24 10:57:23 UTCView event →
M 5.0122 km WNW of Ternate, Indonesia10.0 km2007-01-24 11:27:45 UTCView event →
M 5.0132 km ESE of Laikit, Laikit II (Dimembe), Indonesia10.0 km2007-01-25 00:36:00 UTCView event →
M 4.6142 km WNW of Ternate, Indonesia10.0 km2007-01-25 22:36:45 UTCView event →
M 4.5136 km SE of Tondano, Indonesia10.0 km2007-01-25 23:53:07 UTCView event →
M 4.6118 km WNW of Ternate, Indonesia10.0 km2007-01-26 07:23:35 UTCView event →
M 4.7103 km WNW of Ternate, Indonesia10.0 km2007-01-26 08:25:06 UTCView event →
M 4.699 km WNW of Ternate, Indonesia10.0 km2007-01-26 09:30:06 UTCView event →
M 5.3134 km ESE of Laikit, Laikit II (Dimembe), Indonesia10.0 km2007-01-26 11:44:29 UTCView event →
M 4.799 km WNW of Ternate, Indonesia10.0 km2007-01-26 12:15:50 UTCView event →
M 4.6163 km WSW of Ternate, Indonesia10.0 km2007-01-26 16:20:07 UTCView event →
M 4.8117 km WSW of Ternate, Indonesia10.0 km2007-01-26 16:20:17 UTCView event →
M 5.0110 km WNW of Ternate, Indonesia10.0 km2007-01-27 01:19:24 UTCView event →
M 4.890 km NW of Ternate, Indonesia10.0 km2007-01-27 01:27:22 UTCView event →
M 4.894 km NW of Ternate, Indonesia10.0 km2007-01-27 01:53:12 UTCView event →
M 4.6112 km WNW of Ternate, Indonesia10.0 km2007-01-27 05:39:16 UTCView event →
M 5.5106 km WNW of Ternate, Indonesia10.0 km2007-01-27 07:00:37 UTCView event →
M 4.8131 km WNW of Ternate, Indonesia10.0 km2007-01-27 10:18:47 UTCView event →
M 5.6138 km E of Laikit, Laikit II (Dimembe), Indonesia10.0 km2007-01-27 10:21:46 UTCView event →
M 4.7138 km WNW of Ternate, Indonesia10.0 km2007-01-27 10:23:30 UTCView event →
M 4.571 km SSE of Tondano, Indonesia10.0 km2007-01-27 10:28:38 UTCView event →
M 4.6136 km WNW of Ternate, Indonesia10.0 km2007-01-27 10:40:56 UTCView event →
M 5.0139 km WNW of Ternate, Indonesia10.0 km2007-01-27 11:04:16 UTCView event →
M 4.6133 km E of Laikit, Laikit II (Dimembe), Indonesia10.0 km2007-01-27 12:25:12 UTCView event →
M 4.6141 km E of Laikit, Laikit II (Dimembe), Indonesia10.0 km2007-01-27 20:47:27 UTCView event →
M 4.7Molucca Sea10.0 km2007-01-27 22:57:59 UTCView event →
M 5.6108 km WNW of Ternate, Indonesia10.0 km2007-01-28 05:06:56 UTCView event →
M 5.8121 km WNW of Ternate, Indonesia10.0 km2007-01-28 12:09:05 UTCView event →
M 4.597 km WNW of Ternate, Indonesia10.0 km2007-01-28 21:15:04 UTCView event →
M 4.9126 km WNW of Ternate, Indonesia10.0 km2007-01-29 03:50:35 UTCView event →
M 4.759 km NE of Sofifi, Indonesia10.0 km2007-01-29 07:54:42 UTCView event →
M 4.5126 km ESE of Laikit, Laikit II (Dimembe), Indonesia10.0 km2007-01-29 08:52:30 UTCView event →
M 4.7107 km W of Ternate, Indonesia10.0 km2007-01-29 13:54:54 UTCView event →
M 5.4132 km E of Laikit, Laikit II (Dimembe), Indonesia18.0 km2007-01-30 01:48:33 UTCView event →
M 4.9138 km WSW of Ternate, Indonesia10.0 km2007-01-30 07:46:28 UTCView event →
M 4.7127 km WNW of Ternate, Indonesia10.0 km2007-01-30 08:10:09 UTCView event →
M 4.8149 km WNW of Tobelo, Indonesia10.0 km2007-01-30 09:37:17 UTCView event →
M 4.5106 km WNW of Ternate, Indonesia10.0 km2007-01-30 16:39:58 UTCView event →
M 4.8165 km SSE of Tondano, Indonesia10.0 km2007-01-30 19:45:20 UTCView event →
M 4.5121 km ESE of Tondano, Indonesia11.2 km2007-01-31 05:44:37 UTCView event →
M 4.9167 km SSE of Sarangani, Philippines35.0 km2007-01-31 08:19:28 UTCView event →
M 4.5102 km NW of Ternate, Indonesia10.0 km2007-01-31 12:29:48 UTCView event →
M 4.661 km W of Ternate, Indonesia10.0 km2007-01-31 14:08:35 UTCView event →
M 4.571 km NE of Luwuk, Indonesia68.5 km2007-02-01 08:20:10 UTCView event →
M 5.4124 km WNW of Ternate, Indonesia10.0 km2007-02-01 10:43:26 UTCView event →
M 4.9126 km ESE of Tondano, Indonesia10.0 km2007-02-01 12:45:27 UTCView event →
M 4.6166 km SSE of Tondano, Indonesia10.0 km2007-02-03 21:56:55 UTCView event →
M 5.2144 km S of Sofifi, Indonesia30.0 km2007-02-04 01:19:23 UTCView event →
M 4.7134 km ESE of Laikit, Laikit II (Dimembe), Indonesia10.0 km2007-02-04 06:11:30 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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