QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

Earthquake near Guayama, PR

No earthquake was likely felt in Guayama in the 24 hours to 6:40 am AST (10:40 UTC). The last one was M 3.3, 35 km (22 mi) WSW, at 8:40 am AST on 1 November 2026, estimated intensity II (weak) in town. Every earthquake near Guayama

This page: a magnitude 3.1 earthquake was recorded 39 km (24 mi) south-southeast of Guayama, PR, at 3:01 am AST on 10 December 2022 (07:01 UTC), 30 km deep. 1 person has reported feeling it to USGS.

USGS: 34 km S of Lamboglia, Puerto Rico

82 km (51 mi) S of San Juan, PR

3:01 am AST, Dec 10, 2022 · · 30 km deep · released about 1,200 lb of TNT

Every earthquake near Guayama Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Arroyo Municipio 35 kmPatillas Municipio 37 kmMaunabo Municipio 37 kmGuayama Municipio 39 kmYabucoa Municipio 44 kmSalinas Municipio 47 kmCayey Municipio 52 kmSan Lorenzo Municipio 53 kmHumacao Municipio 55 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
3:01 am AST on 10 December 2022 ()
Where
39 km (24 mi) south-southeast of Guayama, PR · earthquakes near Guayama
Magnitude
M 3.1 (md)
Depth
30 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Arroyo Municipio, 35 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1432 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 27 km (17 mi) from the epicentre. In Guayama, 39 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.

How big was it?

This earthquake released about 1,200 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 280,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 12,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 8,800× the energy of this one
  4. This earthquake M 3.1 about 1,200 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.3× more

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 200 times the energy of this one.

Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:

  1. 5.3 68 km SSE of Emajagua, Puerto Rico · 39 km SE 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 17.6703, -65.9548. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Arroyo Municipio, PR 35 km (22 mi) NNW earthquakes near Arroyo Municipio
Patillas Municipio, PR 37 km (23 mi) N earthquakes near Patillas Municipio
Maunabo Municipio, PR 37 km (23 mi) N earthquakes near Maunabo Municipio
Guayama Municipio, PR 39 km (24 mi) NNW earthquakes near Guayama Municipio
Yabucoa Municipio, PR 44 km (28 mi) NNE earthquakes near Yabucoa Municipio
Salinas Municipio, PR 47 km (29 mi) NW earthquakes near Salinas Municipio

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

Aftershocks so far

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

  1. 2.4 23 km SSE of Arroyo, Puerto Rico
  2. 2.2 12 km SSE of Arroyo, Puerto Rico
  3. 2.8 24 km ESE of El Negro, Puerto Rico
  4. 2.0 1 km NE of La Plena, Puerto Rico
  5. 3.0 3 km NE of La Plena, Puerto Rico
  6. 2.4 3 km ESE of Salinas, Puerto Rico
  7. 2.5 9 km SE of El Negro, Puerto Rico
  8. 2.5 13 km S of Jobos, Puerto Rico
  9. 2.8 4 km SE of G. L. Garcia, Puerto Rico
  10. 2.3 1 km SW of Salinas, Puerto Rico
  11. 2.6 5 km SE of G. L. Garcia, Puerto Rico
  12. 2.5 19 km SSW of Central Aguirre, Puerto Rico
  13. 2.9 5 km S of Jagual, Puerto Rico
  14. 2.0 4 km NW of Yaurel, Puerto Rico
  15. 2.1 20 km SSE of Arroyo, 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.