QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

Earthquake near Bayamón, PR

No earthquake was likely felt in Bayamón in the 24 hours to 5:53 pm AST (21:53 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 2.1 earthquake was recorded 23 km (14 mi) south of Bayamón, PR, at 12:02 am AST on 18 April 2018 (04:02 UTC), 73 km deep.

USGS: 2 km NW of Bayamon, Puerto Rico

25 km (15 mi) SSW of San Juan, PR · 10 km (6 mi) WSW of Caguas, PR

12:02 am AST, Apr 18, 2018 · · 73 km deep · released about 47 lb of TNT

Every earthquake near Bayamón Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cidra Municipio 4 kmAguas Buenas Municipio 7 kmCaguas Municipio 8 kmCayey Municipio 10 kmComerío Municipio 10 kmAibonito Municipio 16 kmSan Lorenzo Municipio 17 kmGuaynabo Municipio 17 kmNaranjito Municipio 17 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
12:02 am AST on 18 April 2018 ()
Where
23 km (14 mi) south of Bayamón, PR · earthquakes near Bayamón
Magnitude
M 2.1 (md)
Depth
73 km below the surface
Felt
no reports yet
Nearest
Cidra Municipio, 4 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3130 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth it was probably too small to be felt, even directly above it. In Bayamón, 23 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: Santa Clara, Sumidero, Cidra, Parcelas La Milagrosa, Parcelas Nuevas, Aguas Buenas.

How big was it?

This earthquake released about 47 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 320,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 230,000× the energy of this one
  3. Around the size people start to feel M 3.0 20× the energy of this one
  4. This earthquake M 2.1 about 47 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 2016-12-05 — about 5,100 times the energy of this one.

Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:

  1. 5.1 3 km W of Aguas Buenas, Puerto Rico · 8 km N of this epicentre
  2. 5.0 3 km N of Brenas, Puerto Rico · 41 km NNW 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 18.1926, -66.1273. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Cidra Municipio, PR 4 km (3 mi) WSW earthquakes near Cidra Municipio
Aguas Buenas Municipio, PR 7 km (4 mi) N earthquakes near Aguas Buenas Municipio
Caguas Municipio, PR 8 km (5 mi) ENE earthquakes near Caguas Municipio
Cayey Municipio, PR 10 km (6 mi) SSW earthquakes near Cayey Municipio
Comerío Municipio, PR 10 km (6 mi) WNW earthquakes near Comerío Municipio
Aibonito Municipio, PR 16 km (10 mi) WSW earthquakes near Aibonito 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. 1.8 6 km SSW of Lamboglia, Puerto Rico
  2. 1.9 3 km NNE of Río Cañas Abajo, Puerto Rico
  3. 1.6 2 km W of Potala Pastillo, Puerto Rico
  4. 2.4 8 km SSE of Jauca, Puerto Rico
  5. 1.8 2 km E of Aguilita, Puerto Rico
  6. 2.4 5 km SE of Arroyo, Puerto Rico
  7. 1.7 5 km SSW of Lamboglia, Puerto Rico
  8. 2.2 2 km E of Arroyo, Puerto Rico
  9. 2.2 5 km SSW of Lamboglia, Puerto Rico
  10. 2.1 4 km ESE of Arroyo, Puerto Rico
  11. 1.8 2 km S of Palmas, Puerto Rico
  12. 1.6 4 km SSE of Palmas, Puerto Rico
  13. 2.0 4 km S of Palmas, Puerto Rico
  14. 1.5 5 km SSW of Lamboglia, Puerto Rico
  15. 1.9 1 km NNE of Buena Vista, 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.