Sequence · 2001-01-01

M 7.5 · Observed seismic cluster · 21 km SE of Lukatan, Philippines

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 cluster37
M6+3
Analysis radius420 km
Observation window14 days
Largest secondary eventM 6.8
Quake Pulse · Major sequence

What the sequence shows

After the M 7.5 reference event, Quake Pulse counts 10 M4+ event(s) in the first 24 hours and 25 in the first 7 days. Fourteen-day M4.5+ activity is about 7.8× the average equivalent derived from the previous year. The largest secondary event is M 0.7 below the reference event.

93/100Sequence score
Events in the previous 24 h1
In the first hour1
In the first 24 hours10
In the first 7 days25
Within 14 days36
Peak one-hour count3

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 d121Average 14-day equivalent4.6Activity / baseline ratio7.8×

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 6.8Magnitude gapM 0.7Observed duration12.4 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.

Detailed timeline

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.

Quake Pulse

Main-event impact

Shallow

55/100
Impact and context →

M4.5+ events in cluster

MagnitudeLocationDepthTime
M 7.521 km SE of Lukatan, Philippines33.0 km2001-01-01 06:57:04 UTCView event →
M 4.831 km ESE of Manay, Philippines33.0 km2001-01-01 07:32:43 UTCView event →
M 5.047 km SE of Lukatan, Philippines33.0 km2001-01-01 08:36:53 UTCView event →
M 6.8Mindanao, Philippines33.0 km2001-01-01 08:54:31 UTCView event →
M 4.966 km ESE of Bobon, Philippines33.0 km2001-01-01 09:12:25 UTCView event →
M 5.058 km ESE of Bobon, Philippines33.0 km2001-01-01 09:20:11 UTCView event →
M 5.143 km SE of Tarragona, Philippines33.0 km2001-01-01 09:34:29 UTCView event →
M 5.077 km E of Pondaguitan, Philippines33.0 km2001-01-01 21:28:49 UTCView event →
M 4.688 km ESE of Lukatan, Philippines33.0 km2001-01-01 22:27:25 UTCView event →
M 5.053 km ESE of Jovellar, Philippines33.0 km2001-01-01 22:41:26 UTCView event →
M 4.945 km ESE of Tarragona, Philippines33.0 km2001-01-01 22:59:29 UTCView event →
M 6.451 km SE of Lukatan, Philippines33.0 km2001-01-02 07:30:03 UTCView event →
M 4.7135 km ESE of Pondaguitan, Philippines33.0 km2001-01-02 17:51:34 UTCView event →
M 4.960 km SE of Lukatan, Philippines112.5 km2001-01-03 15:13:07 UTCView event →
M 4.779 km ESE of Manay, Philippines33.0 km2001-01-04 11:01:32 UTCView event →
M 4.8102 km ESE of Pondaguitan, Philippines33.0 km2001-01-04 17:44:35 UTCView event →
M 5.051 km SE of Tarragona, Philippines33.0 km2001-01-04 19:39:24 UTCView event →
M 4.860 km ESE of San Ignacio, Philippines33.0 km2001-01-05 01:42:00 UTCView event →
M 5.545 km ESE of San Ignacio, Philippines83.6 km2001-01-05 22:51:53 UTCView event →
M 4.852 km ESE of San Ignacio, Philippines94.8 km2001-01-05 23:23:56 UTCView event →
M 5.0142 km ESE of Pondaguitan, Philippines82.6 km2001-01-06 04:03:23 UTCView event →
M 5.655 km ESE of Tarragona, Philippines33.0 km2001-01-06 04:45:29 UTCView event →
M 5.7141 km ESE of Pondaguitan, Philippines53.4 km2001-01-06 15:55:31 UTCView event →
M 4.7152 km SE of Pondaguitan, Philippines33.0 km2001-01-07 18:34:43 UTCView event →
M 5.1160 km SE of Pondaguitan, Philippines33.0 km2001-01-08 04:20:48 UTCView event →
M 4.679 km ESE of Lukatan, Philippines33.0 km2001-01-08 05:42:47 UTCView event →
M 5.2169 km ESE of Pondaguitan, Philippines33.0 km2001-01-08 08:42:32 UTCView event →
M 4.8140 km ESE of Pondaguitan, Philippines33.0 km2001-01-09 19:13:54 UTCView event →
M 4.9130 km ESE of Pondaguitan, Philippines33.0 km2001-01-10 00:35:07 UTCView event →
M 4.568 km E of Pondaguitan, Philippines33.0 km2001-01-10 02:33:16 UTCView event →
M 4.6197 km SSE of Sarangani, Philippines33.0 km2001-01-10 14:58:00 UTCView event →
M 4.5145 km ESE of Pondaguitan, Philippines33.0 km2001-01-10 17:56:19 UTCView event →
M 4.6154 km ESE of Pondaguitan, Philippines33.0 km2001-01-11 02:18:22 UTCView event →
M 4.8167 km ESE of Pondaguitan, Philippines33.0 km2001-01-11 06:59:42 UTCView event →
M 4.5202 km SSE of Sarangani, Philippines33.0 km2001-01-11 15:21:35 UTCView event →
M 5.232 km E of Bacong, Philippines64.3 km2001-01-13 08:52:54 UTCView event →
M 4.729 km SSW of Macrohon, Philippines33.0 km2001-01-13 15:44:23 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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