QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

Earthquake near Magas Arriba, PR

Yes: an earthquake was likely felt in Magas Arriba in the last 24 hours. M 2.1, 9 km (5 mi) WSW of Magas Arriba, at 4:14 pm AST on 11 November 2026 (20:14 UTC); the estimated shaking in Magas Arriba was intensity II (weak). Every earthquake near Magas Arriba

This page: a magnitude 2.3 earthquake was recorded 3 km (2 mi) east of Magas Arriba, PR, at 1:57 pm AST on 8 October 2021 (17:57 UTC), 15 km deep.

USGS: 2 km E of Magas Arriba, Puerto Rico

13 km (8 mi) W of Ponce, PR

1:57 pm AST, Oct 8, 2021 · · 15 km deep · released about 72 lb of TNT

Every earthquake near Magas Arriba Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Peñuelas Municipio 2 kmGuayanilla Municipio 6 kmYauco Municipio 14 kmPonce Municipio 15 kmAdjuntas Municipio 18 kmGuánica Municipio 20 kmSabana Grande Municipio 23 kmMaricao Municipio 26 kmJuana Díaz Municipio 27 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
1:57 pm AST on 8 October 2021 ()
Where
3 km (2 mi) east of Magas Arriba, PR · earthquakes near Magas Arriba
Magnitude
M 2.3 (md)
Depth
15 km below the surface
Felt
no reports yet
Nearest
Peñuelas Municipio, 2 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1860 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 12 km (7 mi) from the epicentre. In Magas Arriba, 3 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: Magas Arriba 3 km, intensity II · Tallaboa 4 km, intensity II · Guayanilla 5 km, intensity II · Tallaboa Alta 6 km, intensity II · Yauco 11 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 72 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 210,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 150,000× the energy of this one
  3. Around the size people start to feel M 3.0 13× the energy of this one
  4. This earthquake M 2.3 about 72 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 1,700,000 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 18.0198, -66.7446. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Peñuelas Municipio, PR 2 km (1 mi) ENE earthquakes near Peñuelas Municipio
Guayanilla Municipio, PR 6 km (4 mi) WSW earthquakes near Guayanilla Municipio
Yauco Municipio, PR 14 km (9 mi) WNW earthquakes near Yauco Municipio
Ponce Municipio, PR 15 km (9 mi) E earthquakes near Ponce Municipio
Adjuntas Municipio, PR 18 km (11 mi) N earthquakes near Adjuntas Municipio
Guánica Municipio, PR 20 km (13 mi) WSW earthquakes near Guánica 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. 2.5 18 km SSE of Maria Antonia, Puerto Rico
  2. 2.6 7 km ESE of La Parguera, Puerto Rico
  3. 2.9 0 km S of Indios, Puerto Rico
  4. 2.6 4 km W of Hormigueros, Puerto Rico
  5. 2.1 7 km S of Guánica, Puerto Rico
  6. 2.6 21 km SSW of Tallaboa, Puerto Rico
  7. 2.2 3 km SW of Tallaboa, Puerto Rico
  8. 2.4 3 km SSE of Indios, Puerto Rico
  9. 2.5 4 km S of Indios, Puerto Rico
  10. 2.7 1 km NNE of Guayanilla, Puerto Rico
  11. 2.1 3 km S of Indios, Puerto Rico
  12. 3.1 4 km S of Indios, Puerto Rico
  13. 2.5 13 km SSE of Maria Antonia, Puerto Rico
  14. 2.5 6 km SSE of Maria Antonia, Puerto Rico
  15. 2.7 1 km NW of Guayanilla, 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.