QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

Earthquake near Arroyo, PR

No earthquake was likely felt in Arroyo in the 24 hours to 7:19 am AST (11:19 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 2.7 earthquake was recorded 18 km (11 mi) south-southeast of Arroyo, PR, at 5:10 am AST on 28 October 2022 (09:10 UTC), 6.6 km deep.

USGS: 18 km SSE of Arroyo, Puerto Rico

66 km (41 mi) S of San Juan, PR · 47 km (29 mi) S of Caguas, PR

5:10 am AST, Oct 28, 2022 · · 6.6 km deep · released about 330 lb of TNT

Every earthquake near Arroyo Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Arroyo Municipio 18 kmPatillas Municipio 21 kmGuayama Municipio 23 kmMaunabo Municipio 24 kmYabucoa Municipio 31 kmSalinas Municipio 33 kmCayey Municipio 36 kmSan Lorenzo Municipio 37 kmHumacao Municipio 43 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
5:10 am AST on 28 October 2022 ()
Where
18 km (11 mi) south-southeast of Arroyo, PR · earthquakes near Arroyo
Magnitude
M 2.7 (md)
Depth
6.6 km below the surface
Felt
no reports yet
Nearest
Arroyo Municipio, 18 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1475 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 24 km (15 mi) from the epicentre. In Arroyo, 18 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 22 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 330 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 46,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 33,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.9× the energy of this one
  4. This earthquake M 2.7 about 330 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 730 times the energy of this one.

Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.

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 17.8127, -66.0027. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Arroyo Municipio, PR 18 km (11 mi) NNW earthquakes near Arroyo Municipio
Patillas Municipio, PR 21 km (13 mi) N earthquakes near Patillas Municipio
Guayama Municipio, PR 23 km (14 mi) NW earthquakes near Guayama Municipio
Maunabo Municipio, PR 24 km (15 mi) NNE earthquakes near Maunabo Municipio
Yabucoa Municipio, PR 31 km (19 mi) NNE earthquakes near Yabucoa Municipio
Salinas Municipio, PR 33 km (20 mi) WNW earthquakes near Salinas Municipio

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

Aftershocks so far

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

  1. 2.0 1 km NNW of Punta Santiago, Puerto Rico
  2. 3.4 2 km SE of Aguas Buenas, Puerto Rico
  3. 2.4 2 km NW of Punta Santiago, Puerto Rico
  4. 2.0 4 km NW of Yaurel, Puerto Rico
  5. 2.1 20 km SSE of Arroyo, Puerto Rico
  6. 2.5 0 km N of Vázquez, Puerto Rico
  7. 2.9 2 km NNW of Punta Santiago, Puerto Rico
  8. 2.3 10 km S of Emajagua, Puerto Rico
  9. 3.0 3 km WSW of La Plena, Puerto Rico
  10. 2.6 6 km SSW of Lamboglia, Puerto Rico
  11. 2.5 11 km S of Santa Isabel, Puerto Rico
  12. 2.8 Puerto Rico region
  13. 2.2 Puerto Rico region
  14. 3.1 Puerto Rico region
  15. 2.5 3 km WSW of Central Aguirre, 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.