QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

Earthquake near Campo Rico, PR

No earthquake was likely felt in Campo Rico in the 24 hours to 6:10 pm AST (22:10 UTC). The last one was M 4.1, 73 km (45 mi) SE, at 5:44 am AST on 28 October 2026, estimated intensity II (weak) in town; 5 felt reports to USGS. Every earthquake near Campo Rico

This page: a magnitude 1.9 earthquake was recorded 4 km (2 mi) west of Campo Rico, PR, at 11:10 am AST on 20 December 2018 (15:10 UTC), 4.0 km deep.

USGS: 3 km W of Campo Rico, Puerto Rico

16 km (10 mi) ESE of San Juan, PR · 10 km (6 mi) SSE of Carolina, PR

11:10 am AST, Dec 20, 2018 · · 4.0 km deep · released about 21 lb of TNT

Every earthquake near Campo Rico Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Canóvanas Municipio 5 kmTrujillo Alto Municipio 8 kmCarolina Municipio 8 kmGurabo Municipio 9 kmLoíza Municipio 12 kmJuncos Municipio 12 kmRío Grande Municipio 15 kmSan Juan Municipio 17 kmLas Piedras Municipio 18 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
11:10 am AST on 20 December 2018 ()
Where
4 km (2 mi) west of Campo Rico, PR · earthquakes near Campo Rico
Magnitude
M 1.9 (md)
Depth
4.0 km below the surface
Felt
no reports yet
Nearest
Canóvanas Municipio, 5 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2883 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 Campo Rico, 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.

Likely felt in: Carolina 6 km, intensity II · Trujillo Alto 8 km, intensity II · Río Grande 12 km, intensity II · Loíza 12 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 500,000× the energy of this one
  3. Around the size people start to feel M 3.0 45× the energy of this one
  4. This earthquake M 1.9 about 21 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 2016-12-05 — about 11,000 times the energy of this one.

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 · 23 km WSW of this epicentre
  2. 5.0 3 km N of Brenas, Puerto Rico · 47 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 18.3340, -65.9321. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Canóvanas Municipio, PR 5 km (3 mi) E earthquakes near Canóvanas Municipio
Trujillo Alto Municipio, PR 8 km (5 mi) W earthquakes near Trujillo Alto Municipio
Carolina Municipio, PR 8 km (5 mi) NNW earthquakes near Carolina Municipio
Gurabo Municipio, PR 9 km (5 mi) SW earthquakes near Gurabo Municipio
Loíza Municipio, PR 12 km (8 mi) N earthquakes near Loíza Municipio
Juncos Municipio, PR 12 km (8 mi) SSE earthquakes near Juncos Municipio

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

Aftershocks so far

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

  1. 1.6 5 km SE of Arroyo, Puerto Rico
  2. 2.3 4 km NW of Palomas, Puerto Rico
  3. 2.3 Puerto Rico region
  4. 1.8 11 km S of Emajagua, Puerto Rico
  5. 2.5 31 km NNE of San Juan, Puerto Rico
  6. 1.8 9 km SSW of Emajagua, Puerto Rico
  7. 1.9 3 km ENE of Bairoa, Puerto Rico
  8. 2.2 1 km NW of Sumidero, Puerto Rico
  9. 2.7 2 km SW of H. Rivera Colon, Puerto Rico
  10. 2.0 20 km NE of San Juan, Puerto Rico
  11. 2.6 3 km N of Cidra, Puerto Rico
  12. 2.6 23 km NNE of Luquillo, Puerto Rico
  13. 2.5 6 km ESE of San Juan, Puerto Rico
  14. 2.1 0 km SW of Toa Alta, Puerto Rico
  15. 2.6 24 km N of San Juan, 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.