QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4md

Earthquake near Salinas, PR

No earthquake was likely felt in Salinas in the 24 hours to 12:10 pm AST (16:10 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 2.4 earthquake was recorded 4 km (2 mi) south of Salinas, PR, at 12:24 pm AST on 28 August 2017 (16:24 UTC), 9.0 km deep.

USGS: 3 km S of Salinas, Puerto Rico

57 km (36 mi) SSW of San Juan, PR · 34 km (21 mi) E of Ponce, PR

12:24 pm AST, Aug 28, 2017 · · 9.0 km deep · released about 110 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 kmGuayama Municipio 18 kmCoamo Municipio 19 kmJuana Díaz Municipio 21 kmAibonito Municipio 21 kmCayey Municipio 24 kmVillalba Municipio 27 kmArroyo Municipio 28 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
12:24 pm AST on 28 August 2017 ()
Where
4 km (2 mi) south of Salinas, PR · earthquakes near Salinas
Magnitude
M 2.4 (md)
Depth
9.0 km below the surface
Felt
no reports yet
Nearest
Salinas Municipio, 5 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3362 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 19 km (12 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.

Likely felt in: Santa Isabel 11 km, intensity II · Coamo 16 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 110 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 140,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 99,000× the energy of this one
  3. Around the size people start to feel M 3.0 8.8× the energy of this one
  4. This earthquake M 2.4 about 110 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 2,200 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 17.9440, -66.3045. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Salinas Municipio, PR 5 km (3 mi) NE earthquakes near Salinas Municipio
Santa Isabel Municipio, PR 9 km (5 mi) W earthquakes near Santa Isabel Municipio
Guayama Municipio, PR 18 km (11 mi) E earthquakes near Guayama Municipio
Coamo Municipio, PR 19 km (12 mi) NNW earthquakes near Coamo Municipio
Juana Díaz Municipio, PR 21 km (13 mi) WNW earthquakes near Juana Díaz Municipio
Aibonito Municipio, PR 21 km (13 mi) NNE earthquakes near Aibonito Municipio

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

Aftershocks so far

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

  1. 2.8 18 km SSE of Arroyo, Puerto Rico
  2. 1.6 20 km S of Arroyo, Puerto Rico
  3. 2.1 3 km SW of Potala Pastillo, Puerto Rico
  4. 1.9 1 km SSW of Guayabal, Puerto Rico
  5. 1.8 5 km NNE of Villalba, Puerto Rico
  6. 2.0 5 km SE of Ponce, Puerto Rico
  7. 2.4 5 km SW of Orocovis, Puerto Rico
  8. 2.2 19 km SSE of Tallaboa, Puerto Rico
  9. 2.3 2 km NNW of Potala Pastillo, Puerto Rico
  10. 3.0 4 km SSE of Cayey, Puerto Rico
  11. 1.9 3 km NNW of Potala Pastillo, Puerto Rico
  12. 1.6 1 km E of Capitanejo, Puerto Rico
  13. 2.7 11 km S of Jauca, Puerto Rico
  14. 2.4 1 km SSW of Potala Pastillo, Puerto Rico
  15. 2.2 6 km SSE of Jauca, 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.