QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

Earthquake near Salinas, PR

No earthquake was likely felt in Salinas in the 24 hours to 2:35 am AST (06:35 UTC). The last one was M 2.2, 8 km (5 mi) NW, at 5:05 pm AST on 8 November 2026, estimated intensity II (weak) in town. Every earthquake near Salinas

This page: a magnitude 2.5 earthquake was recorded 2 km (1 mi) south-southwest of Salinas, PR, at 9:55 am AST on 23 December 2021 (13:55 UTC), 4.0 km deep. 1 person has reported feeling it to USGS.

USGS: 2 km SSW of Salinas, Puerto Rico

56 km (35 mi) SSW of San Juan, PR · 34 km (21 mi) E of Ponce, PR

9:55 am AST, Dec 23, 2021 · · 4.0 km deep · released about 170 lb of TNT

Every earthquake near Salinas Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Salinas Municipio 5 kmSanta Isabel Municipio 9 kmCoamo Municipio 17 kmGuayama Municipio 18 kmAibonito Municipio 20 kmJuana Díaz Municipio 20 kmCayey Municipio 23 kmVillalba Municipio 26 kmBarranquitas Municipio 27 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
9:55 am AST on 23 December 2021 ()
Where
2 km (1 mi) south-southwest of Salinas, PR · earthquakes near Salinas
Magnitude
M 2.5 (md)
Depth
4.0 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Salinas Municipio, 5 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1560 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, people at rest would likely notice it out to about 22 km (14 mi) from the epicentre. In Salinas, 2 km away, the estimate is intensity III (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.

Likely felt in: Santa Isabel 10 km, intensity II · Coamo 15 km, intensity II · Río Cañas Abajo 19 km, intensity II · Guayama 21 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 170 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 89,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 63,000× the energy of this one
  3. Around the size people start to feel M 3.0 5.6× the energy of this one
  4. This earthquake M 2.5 about 170 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 5.6 on 2020-01-07 — about 45,000 times the energy of this one.

Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:

  1. 5.1 3 km W of Aguas Buenas, Puerto Rico · 38 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 17.9591, -66.3063. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Salinas Municipio, PR 5 km (3 mi) ENE earthquakes near Salinas Municipio
Santa Isabel Municipio, PR 9 km (5 mi) W earthquakes near Santa Isabel Municipio
Coamo Municipio, PR 17 km (11 mi) NNW earthquakes near Coamo Municipio
Guayama Municipio, PR 18 km (11 mi) E earthquakes near Guayama Municipio
Aibonito Municipio, PR 20 km (12 mi) NNE earthquakes near Aibonito Municipio
Juana Díaz Municipio, PR 20 km (12 mi) WNW earthquakes near Juana Díaz Municipio

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

Aftershocks so far

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

  1. 2.6 5 km SW of Tallaboa, Puerto Rico
  2. 2.5 0 km ENE of Magas Arriba, Puerto Rico
  3. 2.3 0 km S of Magas Arriba, Puerto Rico
  4. 2.8 7 km SSE of Tallaboa, Puerto Rico
  5. 1.6 5 km SSW of Tallaboa, Puerto Rico
  6. 2.5 8 km SSE of Tallaboa, Puerto Rico
  7. 2.0 0 km WSW of Magas Arriba, Puerto Rico
  8. 2.5 Puerto Rico region
  9. 2.5 4 km S of Adjuntas, Puerto Rico
  10. 2.5 4 km S of Magas Arriba, Puerto Rico
  11. 2.2 7 km SE of Indios, 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.