QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

Earthquake near Naranjito, PR

No earthquake was likely felt in Naranjito in the 24 hours to 8:31 am AST (12:31 UTC). The last one was M 4.8, 84 km (52 mi) WSW, at 9:19 am AST on 18 September 2026, estimated intensity III (weak) in town; 86 felt reports to USGS. Every earthquake near Naranjito

This page: a magnitude 1.8 earthquake was recorded 4 km (2 mi) southwest of Naranjito, PR, at 9:13 am AST on 18 August 2022 (13:13 UTC), 17 km deep.

USGS: 3 km SW of Naranjito, Puerto Rico

26 km (16 mi) WSW of San Juan, PR · 16 km (10 mi) SW of Bayamón, PR

9:13 am AST, Aug 18, 2022 · · 17 km deep · released about 16 lb of TNT

Every earthquake near Naranjito Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Naranjito Municipio 2 kmCorozal Municipio 6 kmComerío Municipio 8 kmToa Alta Municipio 10 kmBarranquitas Municipio 10 kmBayamón Municipio 13 kmAguas Buenas Municipio 15 kmMorovis Municipio 16 kmCidra Municipio 17 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
9:13 am AST on 18 August 2022 ()
Where
4 km (2 mi) southwest of Naranjito, PR · earthquakes near Naranjito
Magnitude
M 1.8 (md)
Depth
17 km below the surface
Felt
no reports yet
Nearest
Naranjito Municipio, 2 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1546 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 Naranjito, 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: H. Rivera Colon, Corozal, Comerío, Galateo, Barranquitas, Pájaros.

How big was it?

This earthquake released about 16 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 970,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 680,000× the energy of this one
  3. Around the size people start to feel M 3.0 61× the energy of this one
  4. This earthquake M 1.8 about 16 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 4.6 on 2019-03-12 — about 15,000 times the energy of this one.

Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:

  1. 5.8 12 km N of Garrochales, Puerto Rico · 44 km NW of this epicentre
  2. 5.1 3 km W of Aguas Buenas, Puerto Rico · 15 km E of this epicentre
  3. 5.0 3 km N of Brenas, Puerto Rico · 26 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 18.2807, -66.2712. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Naranjito Municipio, PR 2 km (1 mi) ENE earthquakes near Naranjito Municipio
Corozal Municipio, PR 6 km (4 mi) WNW earthquakes near Corozal Municipio
Comerío Municipio, PR 8 km (5 mi) SE earthquakes near Comerío Municipio
Toa Alta Municipio, PR 10 km (6 mi) NNE earthquakes near Toa Alta Municipio
Barranquitas Municipio, PR 10 km (6 mi) SSW earthquakes near Barranquitas Municipio
Bayamón Municipio, PR 13 km (8 mi) NE earthquakes near Bayamón Municipio

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

Aftershocks so far

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

  1. 2.3 2 km SE of Lamboglia, Puerto Rico
  2. 2.3 3 km ESE of Salinas, Puerto Rico
  3. 3.0 6 km SSW of Potala Pastillo, Puerto Rico
  4. 1.9 2 km SSE of Lamboglia, Puerto Rico
  5. 2.4 Puerto Rico region
  6. 3.6 1 km NNW of San José, Puerto Rico
  7. 2.2 5 km SSW of Potala Pastillo, Puerto Rico
  8. 3.0 3 km ESE of Cayey, Puerto Rico
  9. 3.0 3 km E of Cayey, Puerto Rico
  10. 1.8 2 km SW of G. L. Garcia, Puerto Rico
  11. 2.1 3 km ENE of Mariano Colón, Puerto Rico
  12. 2.3 5 km SSW of Potala Pastillo, Puerto Rico
  13. 2.5 6 km NNW of Los Llanos, Puerto Rico
  14. 2.7 4 km SE of Morovis, Puerto Rico
  15. 2.1 10 km SSW of Jayuya, 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.