Sequence · 2019-10-31

M 6.5 · Observed seismic cluster · 2 km ENE of Bulatukan, 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 cluster14
M6+1
Analysis radius260 km
Observation window14 days
Largest secondary eventM 5.1
Quake Pulse · Strong sequence

What the sequence shows

After the M 6.5 reference event, Quake Pulse counts 9 M4+ event(s) in the first 24 hours and 12 in the first 7 days. Fourteen-day M4.5+ activity is about 2.1× the average equivalent derived from the previous year. The largest secondary event is M 1.4 below the reference event.

68/100Sequence score
Events in the previous 24 h4
In the first hour3
In the first 24 hours9
In the first 7 days12
Within 14 days14
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 d176Average 14-day equivalent6.8Activity / baseline ratio2.1×

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 5.1Magnitude gapM 1.4Observed duration8.8 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.

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

122 Felt reports · PAGER GREEN · Tsunami indicator · Shallow

65/100
Impact and context →

M4.5+ events in cluster

MagnitudeLocationDepthTime
M 6.52 km ENE of Bulatukan, Philippines10.0 km2019-10-31 01:11:19 UTCView event →
M 5.13 km S of Bulatukan, Philippines10.0 km2019-10-31 01:20:58 UTCView event →
M 4.77 km WNW of Dolo, Philippines10.0 km2019-10-31 01:27:33 UTCView event →
M 4.56 km WSW of Magsaysay, Philippines10.0 km2019-10-31 01:38:29 UTCView event →
M 4.610 km SW of Bulatukan, Philippines10.0 km2019-10-31 05:34:22 UTCView event →
M 4.810 km SW of Magsaysay, Philippines10.0 km2019-10-31 08:56:40 UTCView event →
M 4.54 km NW of Bato, Philippines10.0 km2019-10-31 10:41:16 UTCView event →
M 4.540 km S of Pondaguitan, Philippines149.9 km2019-10-31 11:56:06 UTCView event →
M 4.98 km W of Magsaysay, Philippines14.1 km2019-10-31 17:35:30 UTCView event →
M 4.61 km W of Dolo, Philippines10.0 km2019-10-31 23:18:21 UTCView event →
M 4.913 km W of Magsaysay, Philippines10.0 km2019-11-01 06:07:56 UTCView event →
M 4.812 km W of Dolo, Philippines15.2 km2019-11-01 18:38:36 UTCView event →
M 4.7117 km ESE of Pondaguitan, Philippines47.5 km2019-11-03 14:42:20 UTCView event →
M 5.179 km SSE of Pondaguitan, Philippines90.0 km2019-11-07 22:41:28 UTCView event →
M 5.1216 km SE of Pondaguitan, Philippines59.5 km2019-11-08 19:57:21 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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