QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

Earthquake near Maria Antonia, PR

Yes: an earthquake was likely felt in Maria Antonia in the last 24 hours. M 2.1, 5 km (3 mi) ENE of Maria Antonia, at 4:14 pm AST on 11 November 2026 (20:14 UTC); the estimated shaking in Maria Antonia was intensity II (weak). Every earthquake near Maria Antonia

This page: a magnitude 2.8 earthquake was recorded 7 km (5 mi) southeast of Maria Antonia, PR, at 1:04 am AST on 12 October 2021 (05:04 UTC), 11 km deep.

USGS: 7 km SE of Maria Antonia, Puerto Rico

24 km (15 mi) WSW of Ponce, PR

1:04 am AST, Oct 12, 2021 · · 11 km deep · released about 490 lb of TNT

Every earthquake near Maria Antonia Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Guánica Municipio 9 kmGuayanilla Municipio 10 kmPeñuelas Municipio 16 kmYauco Municipio 17 kmSabana Grande Municipio 21 kmLajas Municipio 22 kmPonce Municipio 26 kmSan Germán Municipio 29 kmMaricao Municipio 29 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
1:04 am AST on 12 October 2021 ()
Where
7 km (5 mi) southeast of Maria Antonia, PR · earthquakes near Maria Antonia
Magnitude
M 2.8 (md)
Depth
11 km below the surface
Felt
no reports yet
Nearest
Guánica Municipio, 9 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1857 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 25 km (16 mi) from the epicentre. In Maria Antonia, 7 km away, the estimate is intensity III (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: Guayanilla 11 km, intensity II · Yauco 12 km, intensity II · Magas Arriba 12 km, intensity II · Tallaboa 15 km, intensity II · Tallaboa Alta 20 km, intensity II · Ponce 25 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 490 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 31,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 22,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.9× the energy of this one
  4. This earthquake M 2.8 about 490 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 6.4 on 2020-01-07 — about 240,000 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 17.9293, -66.8411. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Guánica Municipio, PR 9 km (6 mi) WNW earthquakes near Guánica Municipio
Guayanilla Municipio, PR 10 km (6 mi) NNE earthquakes near Guayanilla Municipio
Peñuelas Municipio, PR 16 km (10 mi) NE earthquakes near Peñuelas Municipio
Yauco Municipio, PR 17 km (11 mi) N earthquakes near Yauco Municipio
Sabana Grande Municipio, PR 21 km (13 mi) NNW earthquakes near Sabana Grande Municipio
Lajas Municipio, PR 22 km (14 mi) WNW earthquakes near Lajas Municipio

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

Aftershocks so far

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

  1. 3.3 4 km SE of La Parguera, Puerto Rico
  2. 3.4 4 km ESE of La Parguera, Puerto Rico
  3. 2.8 4 km SE of La Parguera, Puerto Rico
  4. 2.7 1 km W of Guánica, Puerto Rico
  5. 3.5 1 km W of Guánica, Puerto Rico
  6. 2.8 3 km WSW of Indios, Puerto Rico
  7. 3.1 1 km WSW of Fuig, Puerto Rico
  8. 2.3 2 km SSE of Maricao, Puerto Rico
  9. 3.1 6 km WSW of La Parguera, Puerto Rico
  10. 3.3 6 km WSW of La Parguera, Puerto Rico
  11. 3.0 3 km SW of Indios, Puerto Rico
  12. 2.3 Puerto Rico region
  13. 2.8 5 km SW of Fuig, Puerto Rico
  14. 2.5 18 km SSE of Maria Antonia, Puerto Rico
  15. 2.6 7 km ESE of La Parguera, 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.