QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

Earthquake near Naranjito, PR

No earthquake was likely felt in Naranjito in the 24 hours to 3:38 pm AST (19:38 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 2.1 earthquake was recorded 8 km (5 mi) east of Naranjito, PR, at 2:03 am AST on 6 August 2018 (06:03 UTC), 13 km deep.

USGS: 7 km E of Naranjito, Puerto Rico

8 km (5 mi) S of Bayamón, PR

2:03 am AST, Aug 6, 2018 · · 13 km deep · released about 44 lb of TNT

Every earthquake near Naranjito Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Bayamón Municipio 4 kmGuaynabo Municipio 7 kmAguas Buenas Municipio 8 kmNaranjito Municipio 9 kmToa Alta Municipio 10 kmComerío Municipio 11 kmCataño Municipio 15 kmCidra Municipio 15 kmSan Juan Municipio 16 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
2:03 am AST on 6 August 2018 ()
Where
8 km (5 mi) east of Naranjito, PR · earthquakes near Naranjito
Magnitude
M 2.1 (md)
Depth
13 km below the surface
Felt
no reports yet
Nearest
Bayamón Municipio, 4 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3020 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 11 km (7 mi) from the epicentre. In Naranjito, 8 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: Guaynabo 8 km, intensity II · Bayamón 10 km, intensity II · Sumidero 11 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 44 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 340,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 240,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 44 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

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:

  1. 5.1 3 km W of Aguas Buenas, Puerto Rico · 7 km SSE of this epicentre
  2. 5.0 3 km N of Brenas, Puerto Rico · 28 km NW 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 18.3110, -66.1708. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Bayamón Municipio, PR 4 km (3 mi) N earthquakes near Bayamón Municipio
Guaynabo Municipio, PR 7 km (4 mi) ENE earthquakes near Guaynabo Municipio
Aguas Buenas Municipio, PR 8 km (5 mi) SE earthquakes near Aguas Buenas Municipio
Naranjito Municipio, PR 9 km (6 mi) WSW earthquakes near Naranjito Municipio
Toa Alta Municipio, PR 10 km (6 mi) NW earthquakes near Toa Alta Municipio
Comerío Municipio, PR 11 km (7 mi) SSW earthquakes near Comerío Municipio

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

Aftershocks so far

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

  1. 1.8 5 km SSW of Central Aguirre, Puerto Rico
  2. 2.4 4 km NNE of Guaynabo, Puerto Rico
  3. 1.9 1 km N of Las Ochenta, Puerto Rico
  4. 2.2 5 km ESE of G. L. Garcia, Puerto Rico
  5. 2.7 5 km ESE of San Juan, Puerto Rico
  6. 2.0 0 km NW of Playita Cortada, Puerto Rico
  7. 2.2 1 km ESE of Potala Pastillo, Puerto Rico
  8. 2.1 3 km ESE of Cayey, Puerto Rico
  9. 2.3 17 km NNE of Brenas, Puerto Rico
  10. 2.7 6 km NW of Sabana, Puerto Rico
  11. 2.4 2 km SSE of Cidra, Puerto Rico
  12. 2.5 3 km WSW of Sumidero, Puerto Rico
  13. 1.5 3 km W of Palo Seco, Puerto Rico
  14. 2.5 8 km NNE of Brenas, Puerto Rico
  15. 2.4 18 km NNW of Brenas, 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.