QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

Earthquake near Suárez, PR

No earthquake was likely felt in Suárez in the 24 hours to 12:58 pm AST (16:58 UTC). The last one was M 4.1, 76 km (47 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 Suárez

This page: a magnitude 3.1 earthquake was recorded 25 km (16 mi) north of Suárez, PR, at 8:16 pm AST on 3 March 2018 (00:16 UTC), 66 km deep.

USGS: 24 km N of Suárez, Puerto Rico

36 km (22 mi) NE of San Juan, PR · 31 km (19 mi) NNE of Carolina, PR

8:16 pm AST, Mar 3, 2018 · · 66 km deep · released about 1,200 lb of TNT

Every earthquake near Suárez Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Loíza Municipio 25 kmRío Grande Municipio 31 kmCarolina Municipio 32 kmLuquillo Municipio 35 kmSan Juan Municipio 35 kmCanóvanas Municipio 36 kmTrujillo Alto Municipio 39 kmCataño Municipio 40 kmFajardo Municipio 40 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
8:16 pm AST on 3 March 2018 ()
Where
25 km (16 mi) north of Suárez, PR · earthquakes near Suárez
Magnitude
M 3.1 (md)
Depth
66 km below the surface
Felt
no reports yet
Nearest
Loíza Municipio, 25 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3091 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth it was probably too small to be felt, even directly above it. In Suárez, 25 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: Loíza, Vieques, San Isidro.

How big was it?

This earthquake released about 1,200 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 280,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 12,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 8,800× the energy of this one
  4. This earthquake M 3.1 about 1,200 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.3× more

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 since 1900 lists no earthquake of M5 or more within 50 km.

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 18.6548, -65.8443. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Loíza Municipio, PR 25 km (16 mi) SSW earthquakes near Loíza Municipio
Río Grande Municipio, PR 31 km (19 mi) S earthquakes near Río Grande Municipio
Carolina Municipio, PR 32 km (20 mi) SSW earthquakes near Carolina Municipio
Luquillo Municipio, PR 35 km (22 mi) SSE earthquakes near Luquillo Municipio
San Juan Municipio, PR 35 km (22 mi) SW earthquakes near San Juan Municipio
Canóvanas Municipio, PR 36 km (23 mi) S earthquakes near Canóvanas Municipio

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

Aftershocks so far

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

  1. 2.5 4 km NNE of Guaynabo, Puerto Rico
  2. 2.1 44 km NNE of Luquillo, Puerto Rico
  3. 2.3 2 km SSW of Bayamón, Puerto Rico
  4. 2.5 0 km ENE of San Juan, Puerto Rico
  5. 2.2 5 km NNW of Levittown, Puerto Rico
  6. 1.9 9 km N of Levittown, Puerto Rico
  7. 2.4 39 km N of San Juan, Puerto Rico
  8. 3.1 1 km SSW of Santa Barbara, Puerto Rico
  9. 3.2 26 km NW of Culebra, Puerto Rico
  10. 2.4 44 km N of San Juan, Puerto Rico
  11. 2.5 27 km N of Brenas, Puerto Rico
  12. 2.7 22 km NNW of San Juan, Puerto Rico
  13. 2.8 15 km NNE of Suárez, Puerto Rico
  14. 2.5 1 km WNW of Campanilla, Puerto Rico
  15. 3.0 20 km N of Loíza, 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.