QuakeIndex

Earthquake · reviewed by a seismologist

M 3.6ml

Earthquake near Sabana Grande, PR

Yes: an earthquake was likely felt in Sabana Grande in the last 24 hours. M 2.4, 16 km (10 mi) SSE of Sabana Grande, at 3:43 pm AST on 11 November 2026 (19:43 UTC); the estimated shaking in Sabana Grande was intensity II (weak). Every earthquake near Sabana Grande

This page: a magnitude 3.6 earthquake was recorded 4 km (2 mi) north-northeast of Sabana Grande, PR, at 11:13 pm AST on 13 June 2023 (03:13 UTC), 20 km deep. 11 people have reported feeling it to USGS.

USGS: 3 km NNE of Sabana Grande, Puerto Rico

37 km (23 mi) WNW of Ponce, PR · 22 km (14 mi) ESE of Mayagüez, PR

11:13 pm AST, Jun 13, 2023 · · 20 km deep · released about 3.8 tons of TNT

Every earthquake near Sabana Grande Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sabana Grande Municipio 3 kmMaricao Municipio 7 kmSan Germán Municipio 9 kmYauco Municipio 10 kmLas Marías Municipio 13 kmLajas Municipio 18 kmHormigueros Municipio 18 kmGuánica Municipio 18 kmGuayanilla Municipio 20 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
11:13 pm AST on 13 June 2023 ()
Where
4 km (2 mi) north-northeast of Sabana Grande, PR · earthquakes near Sabana Grande
Magnitude
M 3.6 (ml)
Depth
20 km below the surface
Felt
11 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
Nearest
Sabana Grande Municipio, 3 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1179 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 66 km (41 mi) from the epicentre. In Sabana Grande, 4 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: San Germán 10 km, intensity III · Yauco 14 km, intensity III · Guayanilla 20 km, intensity III · Lares 22 km, intensity III · Magas Arriba 22 km, intensity III · Mayagüez 22 km, intensity III · Adjuntas 25 km, intensity II · Puerto Real 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 3.8 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.6 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 45,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,400× the energy of this one
  4. This earthquake M 3.6 about 3.8 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 7.9× 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 16,000 times the energy of this one.

Before 2016, the USGS record lists 4 earthquakes of M5 or more within 50 km:

  1. 6.3 6 km WNW of Aguadilla, Puerto Rico · 46 km NW of this epicentre
  2. 5.8 4 km E of Moca, Puerto Rico · 34 km NNW of this epicentre
  3. 5.2 19 km SW of Stella, Puerto Rico · 45 km W of this epicentre
  4. 5.1 21 km SW of Stella, Puerto Rico · 45 km W 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 18.1121, -66.9516. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Sabana Grande Municipio, PR 3 km (2 mi) S earthquakes near Sabana Grande Municipio
Maricao Municipio, PR 7 km (4 mi) NNE earthquakes near Maricao Municipio
San Germán Municipio, PR 9 km (6 mi) W earthquakes near San Germán Municipio
Yauco Municipio, PR 10 km (6 mi) ESE earthquakes near Yauco Municipio
Las Marías Municipio, PR 13 km (8 mi) NNW earthquakes near Las Marías Municipio
Lajas Municipio, PR 18 km (11 mi) SSW earthquakes near Lajas Municipio

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

Aftershocks so far

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

  1. 2.5 4 km SW of Guánica, Puerto Rico
  2. 2.6 Puerto Rico region
  3. 3.2 3 km S of La Parguera, Puerto Rico
  4. 2.2 13 km SW of Gu?nica, Puerto Rico
  5. 2.2 7 km ESE of La Parguera, Puerto Rico
  6. 2.6 3 km SE of Maria Antonia, Puerto Rico
  7. 2.4 2 km SW of Indios, Puerto Rico
  8. 2.2 Puerto Rico region
  9. 2.2 3 km SSW of Indios, Puerto Rico
  10. 3.2 1 km NE of Hatillo, Puerto Rico
  11. 2.2 7 km SE of La Parguera, Puerto Rico
  12. 2.5 1 km SSW of Palomas, Puerto Rico
  13. 2.6 2 km N of Palomas, Puerto Rico
  14. 2.2 4 km SSW of Indios, Puerto Rico
  15. 2.3 5 km SW of Guánica, 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.