QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0md

Earthquake near Bayamón, PR

No earthquake was likely felt in Bayamón in the 24 hours to 12:10 pm AST (16:10 UTC). The last one was M 4.8, 98 km (61 mi) WSW, at 9:19 am AST on 18 September 2026, estimated intensity III (weak) in town; 86 felt reports to USGS. Every earthquake near Bayamón

This page: a magnitude 3.0 earthquake was recorded 4 km (3 mi) south-southwest of Bayamón, PR, at 4:35 pm AST on 29 October 2019 (20:35 UTC), 115 km deep.

USGS: 4 km SSW of Bayamón, Puerto Rico

in Bayamón, PR

4:35 pm AST, Oct 29, 2019 · · 115 km deep · released about 1,000 lb of TNT

Every earthquake near Bayamón Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Bayamón Municipio 2 kmGuaynabo Municipio 6 kmToa Alta Municipio 9 kmCataño Municipio 9 kmToa Baja Municipio 11 kmSan Juan Municipio 12 kmAguas Buenas Municipio 12 kmNaranjito Municipio 12 kmDorado Municipio 16 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
4:35 pm AST on 29 October 2019 ()
Where
4 km (3 mi) south-southwest of Bayamón, PR · earthquakes near Bayamón
Magnitude
M 3.0 (md)
Depth
115 km below the surface
Felt
no reports yet
Nearest
Bayamón Municipio, 2 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2570 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth it was probably too small to be felt, even directly above it. In Bayamón, 4 km away, the estimate is intensity I (not felt). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Earthquakes near other towns within 30 km: Guaynabo, Pájaros, Mucarabones, Candelaria, Sabana Seca, Candelaria Arenas.

How big was it?

This earthquake released about 1,000 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 330,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 15,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 10,000× the energy of this one
  4. This earthquake M 3.0 about 1,000 lb of TNT

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

For this area

The largest earthquake within 50 km since 2016 was M 4.6 on 2019-03-12 — about 230 times the energy of this one.

Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:

  1. 5.8 12 km N of Garrochales, Puerto Rico · 48 km WNW of this epicentre
  2. 5.1 3 km W of Aguas Buenas, Puerto Rico · 12 km SSE of this epicentre
  3. 5.0 3 km N of Brenas, Puerto Rico · 24 km NW of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 18.3628, -66.1638. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Bayamón Municipio, PR 2 km (1 mi) SSW earthquakes near Bayamón Municipio
Guaynabo Municipio, PR 6 km (4 mi) ESE earthquakes near Guaynabo Municipio
Toa Alta Municipio, PR 9 km (5 mi) W earthquakes near Toa Alta Municipio
Cataño Municipio, PR 9 km (6 mi) N earthquakes near Cataño Municipio
Toa Baja Municipio, PR 11 km (7 mi) NNW earthquakes near Toa Baja Municipio
San Juan Municipio, PR 12 km (7 mi) ENE earthquakes near San Juan Municipio

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

40 earthquakes have been recorded within 50 km since this one.

  1. 2.3 2 km SW of Vázquez, Puerto Rico
  2. 2.5 1 km SW of Bairoa, Puerto Rico
  3. 2.0 2 km WSW of Vázquez, Puerto Rico
  4. 3.1 0 km ESE of Río Lajas, Puerto Rico
  5. 2.6 17 km N of Brenas, Puerto Rico
  6. 2.6 4 km SSW of Las Ochenta, Puerto Rico
  7. 3.2 25 km N of Loíza, Puerto Rico
  8. 2.7 12 km NNE of Dorado, Puerto Rico
  9. 2.4 4 km ENE of Jayuya, Puerto Rico
  10. 2.4 1 km WSW of Coco, Puerto Rico
  11. 2.3 3 km NNE of La Plena, Puerto Rico
  12. 3.0 2 km NNW of Sabana, Puerto Rico
  13. 2.7 3 km N of Vega Baja, Puerto Rico
  14. 1.9 1 km W of Parcelas Peñuelas, Puerto Rico
  15. 2.2 2 km NNE of Emajagua, Puerto Rico

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.