QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

Earthquake near Arroyo, PR

No earthquake was likely felt in Arroyo in the 24 hours to 11:28 am AST (15:28 UTC). The last one was M 3.3, 39 km (24 mi) WSW, at 8:40 am AST on 1 November 2026, estimated intensity II (weak) in town. Every earthquake near Arroyo

This page: a magnitude 2.5 earthquake was recorded 7 km (5 mi) south-southwest of Arroyo, PR, at 2:14 pm AST on 12 August 2019 (18:14 UTC), 13 km deep.

USGS: 7 km SSW of Arroyo, Puerto Rico

55 km (34 mi) S of San Juan, PR · 37 km (23 mi) S of Caguas, PR

2:14 pm AST, Aug 12, 2019 · · 13 km deep · released about 180 lb of TNT

Every earthquake near Arroyo Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Guayama Municipio 8 kmArroyo Municipio 9 kmPatillas Municipio 16 kmSalinas Municipio 19 kmCayey Municipio 23 kmMaunabo Municipio 24 kmSan Lorenzo Municipio 30 kmYabucoa Municipio 30 kmCidra Municipio 30 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
2:14 pm AST on 12 August 2019 ()
Where
7 km (5 mi) south-southwest of Arroyo, PR · earthquakes near Arroyo
Magnitude
M 2.5 (md)
Depth
13 km below the surface
Felt
no reports yet
Nearest
Guayama Municipio, 8 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2570 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 18 km (11 mi) from the epicentre. In Arroyo, 7 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: Guayama 9 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 180 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 86,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 61,000× the energy of this one
  3. Around the size people start to feel M 3.0 5.4× the energy of this one
  4. This earthquake M 2.5 about 180 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 1,400 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 N 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 17.9078, -66.0973. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Guayama Municipio, PR 8 km (5 mi) NNW earthquakes near Guayama Municipio
Arroyo Municipio, PR 9 km (6 mi) NE earthquakes near Arroyo Municipio
Patillas Municipio, PR 16 km (10 mi) NE earthquakes near Patillas Municipio
Salinas Municipio, PR 19 km (12 mi) WNW earthquakes near Salinas Municipio
Cayey Municipio, PR 23 km (14 mi) NNW earthquakes near Cayey Municipio
Maunabo Municipio, PR 24 km (15 mi) ENE earthquakes near Maunabo Municipio

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

Aftershocks so far

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

  1. 1.6 10 km SSW of Potala Pastillo, Puerto Rico
  2. 1.8 28 km SE of Emajagua, Puerto Rico
  3. 1.8 27 km SE of Emajagua, Puerto Rico
  4. 1.6 2 km NNW of Jagual, Puerto Rico
  5. 1.8 28 km SW of Esperanza, Puerto Rico
  6. 1.6 1 km NNE of Parcelas Nuevas, Puerto Rico
  7. 1.9 26 km ESE of El Negro, Puerto Rico
  8. 1.7 25 km SE of Emajagua, Puerto Rico
  9. 1.7 26 km SE of Emajagua, Puerto Rico
  10. 1.6 18 km SE of El Negro, Puerto Rico
  11. 1.6 23 km SE of Emajagua, Puerto Rico
  12. 2.5 24 km SE of Emajagua, Puerto Rico
  13. 1.8 33 km SSE of Emajagua, Puerto Rico
  14. 1.6 25 km ESE of El Negro, Puerto Rico
  15. 1.6 21 km SE of El Negro, 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.