Quake Pulse logoQuake Pulse
Sequence · 2001-01-13

M 7.7 · Observed seismic cluster · 28 km SSW of Puerto El Triunfo, El Salvador

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 cluster31
M6+1
Analysis radius452 km
Observation window14 days
Largest secondary eventM 5.9
Quake Pulse · Major sequence

What the sequence shows

After the M 7.7 reference event, Quake Pulse counts 4 M4+ event(s) in the first 24 hours and 25 in the first 7 days. Fourteen-day M4.5+ activity is about 9.1× the average equivalent derived from the previous year. The largest secondary event is M 1.7 below the reference event.

88/100Sequence score
Events in the previous 24 h0
In the first hour0
In the first 24 hours4
In the first 7 days25
Within 14 days31
Peak one-hour count2

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 d89Average 14-day equivalent3.4Activity / baseline ratio9.1×

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 6.0Magnitude gapM 1.7Observed duration13.1 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
28 km SSW of Puerto El Triunfo, El Salvador · 452 kmInteractive 3D view of earthquakes within 452 km of 28 km SSW of Puerto El Triunfo, El Salvador.28 km SSW of Puerto El Triunfo, El SalvadorM 4.7 · 82 km SSW of Puerto El Triunfo, El Salvador · 54.7 kmM 4.6 · 37 km S of Zacatecoluca, El Salvador · 30.4 kmM 4.6 · 30 km S of Puerto El Triunfo, El Salvador · 8.1 kmM 4.5 · 5 km SW of Guazapa, El Salvador · 106.8 km
28 km SSW of Puerto El Triunfo, El Salvador452 km4 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

Shallow

57/100
Impact and context →

M4.5+ events in cluster

MagnitudeLocationDepthTime
M 7.728 km SSW of Puerto El Triunfo, El Salvador60.0 km2001-01-13 17:33:32 UTCView event →
M 4.782 km SSW of Puerto El Triunfo, El Salvador33.0 km2001-01-13 22:55:30 UTCView event →
M 4.637 km S of Zacatecoluca, El Salvador63.3 km2001-01-14 02:53:36 UTCView event →
M 4.630 km S of Puerto El Triunfo, El Salvador45.7 km2001-01-14 11:09:18 UTCView event →
M 4.55 km SW of Guazapa, El Salvador33.0 km2001-01-14 15:41:30 UTCView event →
M 5.718 km SSW of Puerto El Triunfo, El Salvador48.8 km2001-01-14 22:41:28 UTCView event →
M 5.243 km S of Puerto El Triunfo, El Salvador42.6 km2001-01-14 22:47:53 UTCView event →
M 5.339 km SW of Puerto El Triunfo, El Salvador68.1 km2001-01-15 00:22:56 UTCView event →
M 4.763 km SW of Puerto El Triunfo, El Salvador66.3 km2001-01-15 00:50:13 UTCView event →
M 5.627 km WSW of Jiquilisco, El Salvador67.7 km2001-01-15 05:09:11 UTCView event →
M 5.823 km S of Puerto El Triunfo, El Salvador74.6 km2001-01-15 12:20:10 UTCView event →
M 4.74 km ENE of Lolotique, El Salvador33.0 km2001-01-15 15:31:22 UTCView event →
M 4.613 km SW of Puerto El Triunfo, El Salvador57.5 km2001-01-16 03:17:41 UTCView event →
M 4.7off the coast of Central America51.0 km2001-01-16 04:38:47 UTCView event →
M 5.729 km S of Puerto El Triunfo, El Salvador44.0 km2001-01-16 08:22:09 UTCView event →
M 5.736 km SSW of Puerto El Triunfo, El Salvador62.6 km2001-01-16 10:58:17 UTCView event →
M 4.839 km SW of Jiquilisco, El Salvador67.9 km2001-01-16 11:24:33 UTCView event →
M 4.549 km SSW of Puerto El Triunfo, El Salvador67.3 km2001-01-16 17:26:39 UTCView event →
M 4.822 km WSW of Tiquisate, Guatemala52.6 km2001-01-16 18:47:57 UTCView event →
M 4.868 km W of Sardinal, Costa Rica33.0 km2001-01-16 22:07:36 UTCView event →
M 5.450 km SW of Jiquilisco, El Salvador44.5 km2001-01-17 01:40:15 UTCView event →
M 4.655 km S of El Rosario, El Salvador45.7 km2001-01-17 21:05:39 UTCView event →
M 6.06 km NNE of Hidalgo, Mexico93.2 km2001-01-19 01:12:52 UTCView event →
M 4.6128 km SSW of Puerto El Triunfo, El Salvador81.1 km2001-01-19 21:18:51 UTCView event →
M 4.5186 km S of La Libertad, El Salvador137.6 km2001-01-20 06:20:19 UTCView event →
M 4.5128 km SW of Jiquilillo, Nicaragua33.0 km2001-01-20 16:25:40 UTCView event →
M 5.913 km NW of Puerto San José, Guatemala64.4 km2001-01-23 05:23:32 UTCView event →
M 4.539 km S of El Rosario, El Salvador53.6 km2001-01-24 01:34:29 UTCView event →
M 5.654 km SW of Puerto El Triunfo, El Salvador33.0 km2001-01-25 10:28:51 UTCView event →
M 4.77 km ESE of Conchagua, El Salvador33.0 km2001-01-25 13:27:27 UTCView event →
M 4.72 km W of Malacatán, Guatemala117.5 km2001-01-26 01:50:42 UTCView event →
M 4.545 km S of La Libertad, El Salvador65.0 km2001-01-26 20:58:32 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 →