QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

Earthquake near Juncos, PR

No earthquake was likely felt in Juncos in the 24 hours to 11:26 am AST (15:26 UTC). The last one was M 4.1, 69 km (43 mi) ESE, at 5:44 am AST on 28 October 2026, estimated intensity II (weak) in town; 5 felt reports to USGS. Every earthquake near Juncos

This page: a magnitude 2.7 earthquake was recorded in Juncos, PR, at 12:43 am AST on 27 August 2023 (04:43 UTC), 15 km deep.

USGS: 1 km W of Juncos, Puerto Rico

24 km (15 mi) SE of San Juan, PR · 11 km (7 mi) E of Caguas, PR

12:43 am AST, Aug 27, 2023 · · 15 km deep · released about 340 lb of TNT

Every earthquake near Juncos Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Juncos Municipio 3 kmGurabo Municipio 7 kmLas Piedras Municipio 8 kmSan Lorenzo Municipio 10 kmCaguas Municipio 12 kmCanóvanas Municipio 13 kmTrujillo Alto Municipio 14 kmHumacao Municipio 19 kmCarolina Municipio 19 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
12:43 am AST on 27 August 2023 ()
Where
in Juncos, PR · earthquakes near Juncos
Magnitude
M 2.7 (md)
Depth
15 km below the surface
Felt
no reports yet
Nearest
Juncos Municipio, 3 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1028 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 20 km (12 mi) from the epicentre. 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: Jagual 10 km, intensity II · Caguas 12 km, intensity II · Humacao 14 km, intensity II · Trujillo Alto 16 km, intensity II · Carolina 17 km, intensity II · Río Grande 20 km, intensity II · Sumidero 20 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 340 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 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 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 710 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 · 21 km W 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 18.2267, -65.9362. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Juncos Municipio, PR 3 km (2 mi) E earthquakes near Juncos Municipio
Gurabo Municipio, PR 7 km (4 mi) NW earthquakes near Gurabo Municipio
Las Piedras Municipio, PR 8 km (5 mi) ESE earthquakes near Las Piedras Municipio
San Lorenzo Municipio, PR 10 km (6 mi) SSW earthquakes near San Lorenzo Municipio
Caguas Municipio, PR 12 km (8 mi) W earthquakes near Caguas Municipio
Canóvanas Municipio, PR 13 km (8 mi) NNE earthquakes near Canóvanas Municipio

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

Aftershocks so far

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

  1. 2.0 4 km SE of Salinas, Puerto Rico
  2. 2.1 Puerto Rico region
  3. 3.2 4 km SSE of Salinas, Puerto Rico
  4. 2.4 4 km SSE of Salinas, Puerto Rico
  5. 2.6 Puerto Rico region
  6. 3.0 5 km SSE of Salinas, Puerto Rico
  7. 3.0 4 km SE of Salinas, Puerto Rico
  8. 2.1 4 km S of Salinas, Puerto Rico
  9. 2.6 4 km SSE of Salinas, Puerto Rico
  10. 2.7 3 km S of Salinas, Puerto Rico
  11. 3.0 5 km SSE of Salinas, Puerto Rico
  12. 2.7 3 km SSE of Salinas, Puerto Rico
  13. 2.6 4 km SSE of Salinas, Puerto Rico
  14. 2.7 Puerto Rico region
  15. 2.5 4 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.