QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0md

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 3.0 earthquake was recorded in Maria Antonia, PR, at 6:41 am AST on 16 August 2021 (10:41 UTC), 10 km deep.

USGS: 1 km SSE of Maria Antonia, Puerto Rico

28 km (17 mi) W of Ponce, PR

6:41 am AST, Aug 16, 2021 · · 10 km deep · released about 860 lb of TNT

Every earthquake near Maria Antonia Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Guánica Municipio 4 kmGuayanilla Municipio 10 kmYauco Municipio 14 kmSabana Grande Municipio 15 kmLajas Municipio 16 kmPeñuelas Municipio 18 kmSan Germán Municipio 23 kmMaricao Municipio 24 kmAdjuntas Municipio 28 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
6:41 am AST on 16 August 2021 ()
Where
in Maria Antonia, PR · earthquakes near Maria Antonia
Magnitude
M 3.0 (md)
Depth
10 km below the surface
Felt
no reports yet
Nearest
Guánica Municipio, 4 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1681 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 34 km (21 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: Yauco 9 km, intensity III · Guayanilla 12 km, intensity III · Magas Arriba 14 km, intensity III · Tallaboa 18 km, intensity II · San Germán 21 km, intensity II · Tallaboa Alta 22 km, intensity II · Adjuntas 28 km, intensity II · Ponce 28 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 860 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 390,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 18,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 12,000× the energy of this one
  4. This earthquake M 3.0 about 860 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 140,000 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 17.9651, -66.8858. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Guánica Municipio, PR 4 km (3 mi) WSW earthquakes near Guánica Municipio
Guayanilla Municipio, PR 10 km (6 mi) ENE earthquakes near Guayanilla Municipio
Yauco Municipio, PR 14 km (9 mi) NNE earthquakes near Yauco Municipio
Sabana Grande Municipio, PR 15 km (9 mi) NNW earthquakes near Sabana Grande Municipio
Lajas Municipio, PR 16 km (10 mi) W earthquakes near Lajas Municipio
Peñuelas Municipio, PR 18 km (11 mi) ENE earthquakes near Peñuelas 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. 2.7 3 km SSE of Maria Antonia, Puerto Rico
  2. 2.4 7 km SSE of Maria Antonia, Puerto Rico
  3. 2.5 0 km NW of Guánica, Puerto Rico
  4. 2.9 4 km SE of La Parguera, Puerto Rico
  5. 2.0 6 km SW of La Parguera, Puerto Rico
  6. 2.8 0 km E of Magas Arriba, Puerto Rico
  7. 3.1 4 km S of Maria Antonia, Puerto Rico
  8. 2.7 2 km S of Guánica, Puerto Rico
  9. 2.9 10 km S of Pole Ojea, Puerto Rico
  10. 3.4 3 km SSE of Maria Antonia, Puerto Rico
  11. 2.5 5 km SE of Maria Antonia, Puerto Rico
  12. 3.2 6 km WSW of La Parguera, Puerto Rico
  13. 3.1 4 km SE of La Parguera, Puerto Rico
  14. 3.6 12 km S of Guánica, Puerto Rico
  15. 2.3 4 km SW of Indios, 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.