QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4md

Earthquake near San Germán, PR

No earthquake was likely felt in San Germán in the 24 hours to 11:24 am AST (15:24 UTC). The last one was M 2.1, 12 km (7 mi) SW, at 11:57 pm AST on 8 November 2026, estimated intensity II (weak) in town. Every earthquake near San Germán

This page: a magnitude 2.4 earthquake was recorded 4 km (3 mi) east of San Germán, PR, at 11:33 am AST on 18 June 2023 (15:33 UTC), 23 km deep.

USGS: 4 km E of San Germán, Puerto Rico

41 km (26 mi) WNW of Ponce, PR · 20 km (13 mi) SE of Mayagüez, PR

11:33 am AST, Jun 18, 2023 · · 23 km deep · released about 110 lb of TNT

Every earthquake near San Germán Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Germán Municipio 5 kmSabana Grande Municipio 6 kmLajas Municipio 11 kmMaricao Municipio 13 kmHormigueros Municipio 14 kmYauco Municipio 16 kmGuánica Municipio 16 kmLas Marías Municipio 17 kmCabo Rojo 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
11:33 am AST on 18 June 2023 ()
Where
4 km (3 mi) east of San Germán, PR · earthquakes near San Germán
Magnitude
M 2.4 (md)
Depth
23 km below the surface
Felt
no reports yet
Nearest
San Germán Municipio, 5 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1242 days ago

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

At this magnitude and depth it was probably too small to be felt, even directly above it. In San Germán, 4 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.

Earthquakes near other towns within 30 km: Sabana Grande, Lajas, Liborio Negron Torres, Sabana Eneas, Palmarejo, Monte Grande.

How big was it?

This earthquake released about 110 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 130,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 95,000× the energy of this one
  3. Around the size people start to feel M 3.0 8.5× the energy of this one
  4. This earthquake M 2.4 about 110 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 1,100,000 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 NNW of this epicentre
  2. 5.8 4 km E of Moca, Puerto Rico · 37 km N of this epicentre
  3. 5.2 19 km SW of Stella, Puerto Rico · 41 km WNW of this epicentre
  4. 5.1 21 km SW of Stella, Puerto Rico · 40 km WNW 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 18.0742, -67.0052. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
San Germán Municipio, PR 5 km (3 mi) NW earthquakes near San Germán Municipio
Sabana Grande Municipio, PR 6 km (4 mi) E earthquakes near Sabana Grande Municipio
Lajas Municipio, PR 11 km (7 mi) SSW earthquakes near Lajas Municipio
Maricao Municipio, PR 13 km (8 mi) NNE earthquakes near Maricao Municipio
Hormigueros Municipio, PR 14 km (8 mi) WNW earthquakes near Hormigueros Municipio
Yauco Municipio, PR 16 km (10 mi) E earthquakes near Yauco 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 7 km SSE of Maria Antonia, Puerto Rico
  2. 2.3 7 km WSW of Fuig, Puerto Rico
  3. 2.2 3 km SW of Indios, Puerto Rico
  4. 2.0 5 km SSE of Maricao, Puerto Rico
  5. 2.5 3 km WSW of La Parguera, Puerto Rico
  6. 3.4 3 km WSW of La Parguera, Puerto Rico
  7. 1.8 5 km S of Indios, Puerto Rico
  8. 1.6 6 km WSW of Fuig, Puerto Rico
  9. 2.2 2 km NE of Magas Arriba, Puerto Rico
  10. 2.0 2 km WNW of Yauco, Puerto Rico
  11. 2.8 3 km WSW of La Parguera, Puerto Rico
  12. 2.2 4 km ENE of Maricao, Puerto Rico
  13. 2.5 3 km NE of San Germán, Puerto Rico
  14. 3.4 1 km N of Indios, Puerto Rico
  15. 2.0 Puerto Rico region

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.