QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1Md

Earthquake near Luis M. Cintron, PR

No earthquake was likely felt in Luis M. Cintron in the 24 hours to 12:35 am AST (04:35 UTC). The last one was M 4.1, 50 km (31 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 Luis M. Cintron

This page: a magnitude 2.1 earthquake was recorded 12 km (7 mi) east of Luis M. Cintron, PR, at 12:23 am AST on 2 December 2016 (04:23 UTC), 12 km deep.

USGS: 11 km E of Luis M. Cintron, Puerto Rico

58 km (36 mi) ESE of San Juan, PR · 49 km (31 mi) ESE of Carolina, PR

12:23 am AST, Dec 2, 2016 · · 12 km deep · released about 43 lb of TNT

Every earthquake near Luis M. Cintron Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Ceiba Municipio 11 kmFajardo Municipio 12 kmLuquillo Municipio 21 kmVieques Municipio 22 kmCulebra Municipio 23 kmNaguabo Municipio 24 kmRío Grande Municipio 30 kmHumacao Municipio 33 kmCanóvanas Municipio 38 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
12:23 am AST on 2 December 2016 ()
Where
12 km (7 mi) east of Luis M. Cintron, PR · earthquakes near Luis M. Cintron
Magnitude
M 2.1 (Md)
Depth
12 km below the surface
Felt
no reports yet
Nearest
Ceiba Municipio, 11 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3632 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 12 km (7 mi) from the epicentre. In Luis M. Cintron, 12 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: Fajardo, Aguas Claras, Daguao, Isabel Segunda, Ramos, Luquillo.

How big was it?

This earthquake released about 43 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 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× 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 43 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 4.3 on 2016-09-02 — about 2,000 times the energy of this one.

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 18.2996, -65.5282. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Ceiba Municipio, PR 11 km (7 mi) WSW earthquakes near Ceiba Municipio
Fajardo Municipio, PR 12 km (7 mi) NNW earthquakes near Fajardo Municipio
Luquillo Municipio, PR 21 km (13 mi) WNW earthquakes near Luquillo Municipio
Vieques Municipio, PR 22 km (14 mi) SSE earthquakes near Vieques Municipio
Culebra Municipio, PR 23 km (15 mi) E earthquakes near Culebra Municipio
Naguabo Municipio, PR 24 km (15 mi) WSW earthquakes near Naguabo Municipio

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

Aftershocks so far

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

  1. 2.5 28 km SE of El Negro, Puerto Rico
  2. 2.5 8 km SE of Esperanza, Puerto Rico
  3. 1.9 17 km SW of Esperanza, Puerto Rico
  4. 2.1 15 km SW of Esperanza, Puerto Rico
  5. 2.9 25 km ESE of El Negro, Puerto Rico
  6. 2.3 6 km S of Punta Santiago, Puerto Rico
  7. 2.8 30 km SE of El Negro, Puerto Rico
  8. 2.9 27 km SSW of Esperanza, Puerto Rico
  9. 3.0 7 km N of Vieques, Puerto Rico
  10. 2.1 2 km SE of Esperanza, Puerto Rico
  11. 2.8 25 km SW of Esperanza, Puerto Rico
  12. 2.0 24 km SSW of Esperanza, Puerto Rico
  13. 2.0 7 km WSW of Esperanza, Puerto Rico
  14. 2.2 9 km N of Loíza, Puerto Rico
  15. 2.0 2 km E of Culebra, 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.