Sequence · 2013-09-24

M 7.7 · Observed seismic cluster · 113 km NW of Bela, Pakistan

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 cluster20
M6+2
Analysis radius452 km
Observation window14 days
Largest secondary eventM 6.8
Quake Pulse · Major sequence

What the sequence shows

After the M 7.7 reference event, Quake Pulse counts 16 M4+ event(s) in the first 24 hours and 19 in the first 7 days. Fourteen-day M4.5+ activity is about 23.6× the average equivalent derived from the previous year. The largest secondary event is M 0.9 below the reference event.

100/100Sequence score
Events in the previous 24 h0
In the first hour7
In the first 24 hours16
In the first 7 days19
Within 14 days19
Peak one-hour count7

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 d21Average 14-day equivalent0.8Activity / baseline ratio23.6×

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 0.9Observed duration3.8 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

34 Felt reports · PAGER RED · Shallow

89/100
Impact and context →

M4.5+ events in cluster

MagnitudeLocationDepthTime
M 7.7113 km NW of Bela, Pakistan15.0 km2013-09-24 11:29:47 UTCView event →
M 5.8122 km WSW of Khuzdar, Pakistan10.0 km2013-09-24 11:36:27 UTCView event →
M 5.1103 km WNW of Bela, Pakistan10.0 km2013-09-24 11:41:50 UTCView event →
M 4.873 km N of Bela, Pakistan10.0 km2013-09-24 11:42:43 UTCView event →
M 4.6122 km WNW of Bela, Pakistan10.0 km2013-09-24 11:43:54 UTCView event →
M 5.081 km SW of Uthal, Pakistan10.0 km2013-09-24 11:44:26 UTCView event →
M 5.0115 km WNW of Bela, Pakistan10.0 km2013-09-24 11:50:37 UTCView event →
M 4.7106 km WSW of Khuzdar, Pakistan10.0 km2013-09-24 12:07:06 UTCView event →
M 4.9111 km WSW of Khuzdar, Pakistan10.0 km2013-09-24 12:42:10 UTCView event →
M 5.6112 km WSW of Khuzdar, Pakistan14.5 km2013-09-24 13:01:39 UTCView event →
M 5.297 km WSW of Khuzdar, Pakistan21.0 km2013-09-24 14:08:32 UTCView event →
M 4.9128 km NW of Bela, Pakistan18.2 km2013-09-24 15:12:23 UTCView event →
M 4.8127 km NW of Bela, Pakistan10.0 km2013-09-24 15:13:48 UTCView event →
M 5.5130 km NW of Bela, Pakistan10.5 km2013-09-24 17:20:13 UTCView event →
M 4.6106 km WSW of Khuzdar, Pakistan26.6 km2013-09-24 19:54:07 UTCView event →
M 4.8103 km WSW of Khuzdar, Pakistan24.9 km2013-09-24 21:59:03 UTCView event →
M 4.8129 km WSW of Khuzdar, Pakistan22.9 km2013-09-24 22:38:16 UTCView event →
M 4.8104 km NNW of Ormara, Pakistan14.9 km2013-09-27 06:51:01 UTCView event →
M 4.9119 km WSW of Khuzdar, Pakistan15.7 km2013-09-27 18:08:39 UTCView event →
M 6.8129 km WSW of Khuzdar, Pakistan12.0 km2013-09-28 07:34:06 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.

Blog

Latest from the blog

Guides, explainers and practical reading to go beyond the live data.

View all articles →