Quake Pulse logoQuake Pulse
Sequence · 2012-03-20

M 7.4 · Observed seismic cluster · 6 km E of Santiago Llano Grande, Mexico

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 cluster42
M6+2
Analysis radius404 km
Observation window14 days
Largest secondary eventM 6.0
Quake Pulse

Sequence timeline

Within first 24 hours18
Within first 7 days29
Observed duration13.5 d
Gap from reference eventM 1.4
0 h13.5 d
Quake Pulse

Main-event impact

2,552 Felt reports · Shallow

80/100
Impact and context →

M4.5+ events in cluster

MagnitudeLocationDepthTime
M 7.46 km E of Santiago Llano Grande, Mexico20.0 km2012-03-20 18:02:47 UTCView event →
M 4.911 km WSW of San José del Progreso, Mexico10.0 km2012-03-20 18:14:44 UTCView event →
M 4.94 km SSW of Pinotepa Nacional, Mexico10.0 km2012-03-20 18:16:31 UTCView event →
M 4.611 km NNW of San Miguel Huautla, Mexico10.0 km2012-03-20 18:21:22 UTCView event →
M 5.35 km NNE of Corralero, Mexico10.0 km2012-03-20 18:22:33 UTCView event →
M 5.13 km WSW of Corralero, Mexico10.0 km2012-03-20 18:35:36 UTCView event →
M 5.256 km SSW of Santiago Tepextla, Mexico3.9 km2012-03-20 19:02:38 UTCView event →
M 4.53 km E of Santo Domingo Armenta, Mexico13.4 km2012-03-20 19:07:19 UTCView event →
M 4.719 km SW of Corralero, Mexico10.0 km2012-03-20 19:19:50 UTCView event →
M 4.87 km SSW of Mancuernas, Mexico11.7 km2012-03-20 19:34:08 UTCView event →
M 5.11 km S of San Pedro Atoyac, Mexico24.6 km2012-03-20 20:14:39 UTCView event →
M 4.611 km SW of El Ciruelo, Mexico15.0 km2012-03-20 21:43:40 UTCView event →
M 5.024 km SW of San Nicolás, Mexico10.0 km2012-03-20 22:25:40 UTCView event →
M 4.6102 km SW of Santiago Tepextla, Mexico10.0 km2012-03-21 02:07:37 UTCView event →
M 4.959 km SSW of Santiago Tepextla, Mexico15.0 km2012-03-21 02:25:29 UTCView event →
M 5.02 km SE of Cuajinicuilapa, Mexico15.0 km2012-03-21 02:54:40 UTCView event →
M 4.66 km WSW of Cuajinicuilapa, Mexico15.0 km2012-03-21 04:02:40 UTCView event →
M 5.03 km SE of El Pitahayo, Mexico20.0 km2012-03-21 11:36:14 UTCView event →
M 5.13 km E of Santo Domingo Armenta, Mexico27.7 km2012-03-22 16:46:47 UTCView event →
M 4.87 km WNW of Mancuernas, Mexico10.0 km2012-03-22 20:42:05 UTCView event →
M 4.813 km S of Santiago Tepextla, Mexico9.2 km2012-03-22 22:14:45 UTCView event →
M 4.70 km SSE of Santiago Llano Grande, Mexico24.9 km2012-03-22 23:47:05 UTCView event →
M 4.639 km SSW of Santa María Chico Ometepec, Mexico10.0 km2012-03-23 17:13:56 UTCView event →
M 4.665 km SSW of Copala, Mexico17.5 km2012-03-23 23:37:41 UTCView event →
M 4.69 km W of Corralero, Mexico1.0 km2012-03-23 23:47:44 UTCView event →
M 4.87 km SSW of El Ciruelo, Mexico10.0 km2012-03-24 01:58:35 UTCView event →
M 4.65 km S of Mancuernas, Mexico20.0 km2012-03-25 01:46:26 UTCView event →
M 4.72 km NE of Corralero, Mexico15.3 km2012-03-25 01:55:29 UTCView event →
M 4.7Near the coast of Oaxaca, Mexico10.4 km2012-03-26 10:46:25 UTCView event →
M 4.6Guerrero-Oaxaca border region, Mexico10.1 km2012-03-28 05:39:39 UTCView event →
M 4.58 km ENE of Corralero, Mexico10.0 km2012-03-28 22:33:02 UTCView event →
M 4.87 km E of Vicente Guerrero, Mexico156.0 km2012-03-30 14:38:58 UTCView event →
M 5.35 km NNW of San Nicolás, Mexico20.0 km2012-04-01 22:23:48 UTCView event →
M 6.07 km SSW of Santa María Cortijo, Mexico9.0 km2012-04-02 17:36:42 UTCView event →
M 4.98 km SSW of Montecillos, Mexico10.0 km2012-04-02 17:44:23 UTCView event →
M 4.513 km W of San Nicolás, Mexico10.0 km2012-04-02 18:07:02 UTCView event →
M 4.84 km W of Santiago Tepextla, Mexico1.0 km2012-04-02 18:17:28 UTCView event →
M 4.64 km SSW of Santiago Tepextla, Mexico1.0 km2012-04-02 18:26:27 UTCView event →
M 4.57 km SSW of Santiago Tepextla, Mexico17.0 km2012-04-02 18:39:12 UTCView event →
M 4.61 km N of Santiago Llano Grande, Mexico15.9 km2012-04-02 19:38:10 UTCView event →
M 5.014 km SSW of Montecillos, Mexico10.0 km2012-04-02 23:55:00 UTCView event →
M 4.85 km S of Montecillos, Mexico7.3 km2012-04-03 05:35:17 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 →