QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

Earthquake near Salinas, PR

No earthquake was likely felt in Salinas in the 24 hours to 4:21 pm AST (20:21 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 1.9 earthquake was recorded 4 km (2 mi) south-southeast of Salinas, PR, at 9:12 am AST on 21 December 2023 (13:12 UTC), 15 km deep.

USGS: 3 km SSE of Salinas, Puerto Rico

56 km (35 mi) SSW of San Juan, PR · 36 km (23 mi) E of Ponce, PR

9:12 am AST, Dec 21, 2023 · · 15 km deep · released about 21 lb of TNT

Every earthquake near Salinas Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Salinas Municipio 4 kmSanta Isabel Municipio 11 kmGuayama Municipio 16 kmCoamo Municipio 19 kmAibonito Municipio 21 kmJuana Díaz Municipio 23 kmCayey Municipio 23 kmArroyo Municipio 26 kmBarranquitas Municipio 29 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
9:12 am AST on 21 December 2023 ()
Where
4 km (2 mi) south-southeast of Salinas, PR · earthquakes near Salinas
Magnitude
M 1.9 (md)
Depth
15 km below the surface
Felt
no reports yet
Nearest
Salinas Municipio, 4 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1056 days ago

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

At this magnitude and depth, people at rest would likely notice it out to about 1 km (1 mi) from the epicentre. In Salinas, 4 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: Las Ochenta, Central Aguirre, Coquí, Coco, Parcelas Peñuelas, Jauca.

How big was it?

This earthquake released about 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 730,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 520,000× the energy of this one
  3. Around the size people start to feel M 3.0 46× the energy of this one
  4. This earthquake M 1.9 about 21 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 370,000 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 · 39 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 17.9438, -66.2843. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Salinas Municipio, PR 4 km (2 mi) NE earthquakes near Salinas Municipio
Santa Isabel Municipio, PR 11 km (7 mi) W earthquakes near Santa Isabel Municipio
Guayama Municipio, PR 16 km (10 mi) ENE earthquakes near Guayama Municipio
Coamo Municipio, PR 19 km (12 mi) NNW earthquakes near Coamo Municipio
Aibonito Municipio, PR 21 km (13 mi) N earthquakes near Aibonito Municipio
Juana Díaz Municipio, PR 23 km (14 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

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

  1. 2.6 3 km SSE of Salinas, Puerto Rico
  2. 1.8 2 km E of Cayey, Puerto Rico
  3. 2.7 2 km NW of Tallaboa, Puerto Rico
  4. 2.1 2 km NNE of Tallaboa, Puerto Rico
  5. 3.3 13 km SE of Lamboglia, Puerto Rico
  6. 2.2 7 km SSE of Salinas, Puerto Rico
  7. 2.6 3 km SSW of Peñuelas, Puerto Rico
  8. 1.5 5 km SE of Cayey, Puerto Rico
  9. 2.5 6 km SSW of Ponce, Puerto Rico
  10. 2.8 4 km WSW of Central Aguirre, Puerto Rico
  11. 2.1 4 km NW of Orocovis, Puerto Rico
  12. 2.6 4 km NW of Orocovis, Puerto Rico
  13. 2.3 7 km SSW of Ponce, Puerto Rico
  14. 3.0 1 km SSE of Corozal, Puerto Rico
  15. 2.2 5 km SSE of Salinas, 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.