QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

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 3.1 earthquake was recorded 3 km (2 mi) east of Magas Arriba, PR, at 6:58 am AST on 13 April 2021 (10:58 UTC), 13 km deep. 1 person has reported feeling it to USGS.

USGS: 2 km E of Magas Arriba, Puerto Rico

13 km (8 mi) W of Ponce, PR

6:58 am AST, Apr 13, 2021 · · 13 km deep · released about 1,200 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 kmPonce Municipio 14 kmYauco Municipio 15 kmAdjuntas Municipio 19 kmGuánica Municipio 21 kmSabana Grande Municipio 23 kmJuana Díaz Municipio 27 kmMaricao 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
6:58 am AST on 13 April 2021 ()
Where
3 km (2 mi) east of Magas Arriba, PR · earthquakes near Magas Arriba
Magnitude
M 3.1 (md)
Depth
13 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Peñuelas Municipio, 2 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1556 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 38 km (24 mi) from the epicentre. In Magas Arriba, 3 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: Magas Arriba 3 km, intensity III · Tallaboa 4 km, intensity III · Guayanilla 5 km, intensity III · Tallaboa Alta 6 km, intensity III · Yauco 12 km, intensity III · Ponce 12 km, intensity III · Adjuntas 16 km, intensity II · Jayuya 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 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 6.7 290,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 13,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 9,100× 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 1.2× 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 6.4 on 2020-01-07 — about 100,000 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 18.0160, -66.7413. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Peñuelas Municipio, PR 2 km (1 mi) NE earthquakes near Peñuelas Municipio
Guayanilla Municipio, PR 6 km (4 mi) W earthquakes near Guayanilla Municipio
Ponce Municipio, PR 14 km (9 mi) E earthquakes near Ponce Municipio
Yauco Municipio, PR 15 km (9 mi) WNW earthquakes near Yauco Municipio
Adjuntas Municipio, PR 19 km (11 mi) N earthquakes near Adjuntas Municipio
Guánica Municipio, PR 21 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

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

  1. 3.1 5 km SSE of La Parguera, Puerto Rico
  2. 2.4 7 km WSW of Fuig, Puerto Rico
  3. 3.7 4 km ESE of La Parguera, Puerto Rico
  4. 2.2 2 km SW of Indios, Puerto Rico
  5. 3.1 4 km SE of Maria Antonia, Puerto Rico
  6. 2.4 5 km ESE of La Parguera, Puerto Rico
  7. 2.6 15 km SSE of Guánica, Puerto Rico
  8. 2.7 3 km SW of Guánica, Puerto Rico
  9. 2.8 6 km SSW of Indios, Puerto Rico
  10. 2.2 1 km SSW of Guayanilla, Puerto Rico
  11. 2.4 2 km S of Guánica, Puerto Rico
  12. 2.4 5 km SSE of Maria Antonia, Puerto Rico
  13. 2.8 1 km ESE of Guayanilla, Puerto Rico
  14. 3.1 5 km ESE of La Parguera, Puerto Rico
  15. 2.8 5 km SE 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.