QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

Earthquake near Los Llanos, PR

No earthquake was likely felt in Los Llanos in the 24 hours to 1:02 am AST (05:02 UTC). The last one was M 2.2, 7 km (4 mi) ESE, at 5:05 pm AST on 8 November 2026, estimated intensity II (weak) in town. Every earthquake near Los Llanos

This page: a magnitude 2.5 earthquake was recorded 6 km (4 mi) northwest of Los Llanos, PR, at 5:18 pm AST on 25 March 2021 (21:18 UTC), 54 km deep.

USGS: 5 km NW of Los Llanos, Puerto Rico

53 km (33 mi) SW of San Juan, PR · 22 km (14 mi) ENE of Ponce, PR

5:18 pm AST, Mar 25, 2021 · · 54 km deep · released about 190 lb of TNT

Every earthquake near Los Llanos Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Villalba Municipio 5 kmCoamo Municipio 9 kmJuana Díaz Municipio 12 kmOrocovis Municipio 14 kmSanta Isabel Municipio 17 kmBarranquitas Municipio 18 kmAibonito Municipio 19 kmJayuya Municipio 20 kmPonce Municipio 20 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
5:18 pm AST on 25 March 2021 ()
Where
6 km (4 mi) northwest of Los Llanos, PR · earthquakes near Los Llanos
Magnitude
M 2.5 (md)
Depth
54 km below the surface
Felt
no reports yet
Nearest
Villalba Municipio, 5 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2057 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 Los Llanos, 6 km away, the estimate is intensity II (weak). 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: Villalba, Guayabal, Río Cañas Abajo, Juana Díaz, Coamo, Las Ollas.

How big was it?

This earthquake released about 190 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 78,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 55,000× the energy of this one
  3. Around the size people start to feel M 3.0 4.9× the energy of this one
  4. This earthquake M 2.5 about 190 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 6.4 on 2020-01-07 — about 620,000 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 · 37 km ENE of this epicentre
  2. 5.0 3 km N of Brenas, Puerto Rico · 46 km NNE 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 18.0950, -66.4438. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Villalba Municipio, PR 5 km (3 mi) NW earthquakes near Villalba Municipio
Coamo Municipio, PR 9 km (6 mi) E earthquakes near Coamo Municipio
Juana Díaz Municipio, PR 12 km (7 mi) SSW earthquakes near Juana Díaz Municipio
Orocovis Municipio, PR 14 km (9 mi) N earthquakes near Orocovis Municipio
Santa Isabel Municipio, PR 17 km (10 mi) SSE earthquakes near Santa Isabel Municipio
Barranquitas Municipio, PR 18 km (11 mi) NE earthquakes near Barranquitas 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. 2.4 2 km WNW of Palomas, Puerto Rico
  2. 2.1 7 km SE of Maria Antonia, Puerto Rico
  3. 2.4 4 km SE of Maria Antonia, Puerto Rico
  4. 2.4 2 km ESE of Magas Arriba, Puerto Rico
  5. 2.3 5 km S of Indios, Puerto Rico
  6. 2.4 8 km S of Indios, Puerto Rico
  7. 2.0 8 km S of Indios, Puerto Rico
  8. 2.5 6 km SE of Maria Antonia, Puerto Rico
  9. 2.4 4 km SSE of Indios, Puerto Rico
  10. 2.3 3 km SE of Jobos, Puerto Rico
  11. 2.6 3 km SW of Indios, Puerto Rico
  12. 2.5 4 km NNW of Guayanilla, Puerto Rico
  13. 1.7 2 km WNW of Indios, Puerto Rico
  14. 3.1 11 km SSE of Maria Antonia, Puerto Rico
  15. 2.1 5 km SE of Maria Antonia, 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.