QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4md

Earthquake near San Sebastián, PR

No earthquake was likely felt in San Sebastián in the 24 hours to 3:21 pm AST (19:21 UTC). The last one was M 3.4, 50 km (31 mi) N, at 9:00 pm AST on 27 October 2026, estimated intensity II (weak) in town. Every earthquake near San Sebastián

This page: a magnitude 2.4 earthquake was recorded 3 km (2 mi) west-northwest of San Sebastián, PR, at 1:45 am AST on 24 August 2022 (05:45 UTC), 16 km deep.

USGS: 2 km WNW of San Sebastián, Puerto Rico

21 km (13 mi) NE of Mayagüez, PR · 101 km (63 mi) W of San Juan, PR

1:45 am AST, Aug 24, 2022 · · 16 km deep · released about 140 lb of TNT

Every earthquake near San Sebastián Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Sebastián Municipio 5 kmMoca Municipio 8 kmLas Marías Municipio 13 kmAñasco Municipio 14 kmIsabela Municipio 16 kmQuebradillas Municipio 17 kmLares Municipio 17 kmAguada Municipio 18 kmCamuy 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
1:45 am AST on 24 August 2022 ()
Where
3 km (2 mi) west-northwest of San Sebastián, PR · earthquakes near San Sebastián
Magnitude
M 2.4 (md)
Depth
16 km below the surface
Felt
no reports yet
Nearest
San Sebastián Municipio, 5 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1541 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 14 km (9 mi) from the epicentre. In San Sebastián, 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: San Sebastián 3 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 140 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 5.8 110,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 78,000× the energy of this one
  3. Around the size people start to feel M 3.0 6.9× the energy of this one
  4. This earthquake M 2.4 about 140 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 870,000 times the energy of this one.

Before 2016, the USGS record lists 9 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.1 24 km NNW of San Antonio, Puerto Rico · 44 km NNW of this epicentre
  2. 6.4 32 km NW of Aguadilla, Puerto Rico · 49 km NW of this epicentre
  3. 6.3 6 km WNW of Aguadilla, Puerto Rico · 24 km WNW of this epicentre
  4. 6.1 15 km WNW of San Antonio, Puerto Rico · 32 km NW of this epicentre
  5. 6.1 18 km NNW of San Antonio, Puerto Rico · 37 km NNW 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 18.3423, -67.0168. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
San Sebastián Municipio, PR 5 km (3 mi) ESE earthquakes near San Sebastián Municipio
Moca Municipio, PR 8 km (5 mi) WNW earthquakes near Moca Municipio
Las Marías Municipio, PR 13 km (8 mi) SSE earthquakes near Las Marías Municipio
Añasco Municipio, PR 14 km (8 mi) WSW earthquakes near Añasco Municipio
Isabela Municipio, PR 16 km (10 mi) N earthquakes near Isabela Municipio
Quebradillas Municipio, PR 17 km (10 mi) NE earthquakes near Quebradillas Municipio

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

Aftershocks so far

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

  1. 2.1 3 km E of Maria Antonia, Puerto Rico
  2. 2.1 1 km ENE of Palomas, Puerto Rico
  3. 2.5 5 km S of La Parguera, Puerto Rico
  4. 1.9 2 km N of Guayanilla, Puerto Rico
  5. 2.0 6 km S of Guánica, Puerto Rico
  6. 2.0 1 km ESE of Sabana Grande, Puerto Rico
  7. 2.9 21 km NNW of Camuy, Puerto Rico
  8. 2.4 2 km S of Guánica, Puerto Rico
  9. 2.1 2 km SSW of Indios, Puerto Rico
  10. 2.7 3 km W of Fuig, Puerto Rico
  11. 2.2 3 km WSW of Guánica, Puerto Rico
  12. 2.4 1 km NNE of Fuig, Puerto Rico
  13. 2.3 4 km E of La Parguera, Puerto Rico
  14. 2.5 2 km SW of Indios, Puerto Rico
  15. 2.2 0 km WNW of Magas Arriba, 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.