QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5md

Earthquake near Luis M. Cintron, PR

No earthquake was likely felt in Luis M. Cintron in the 24 hours to 10:43 am AST (14:43 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 3.5 earthquake was recorded 10 km (6 mi) east-northeast of Luis M. Cintron, PR, at 2:06 am AST on 26 October 2023 (06:06 UTC), 114 km deep.

USGS: 9 km ENE of Luis M. Cintron, Puerto Rico

54 km (34 mi) E of San Juan, PR · 46 km (29 mi) E of Carolina, PR

2:06 am AST, Oct 26, 2023 · · 114 km deep · released about 3.2 tons of TNT

Every earthquake near Luis M. Cintron Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fajardo Municipio 7 kmCeiba Municipio 12 kmLuquillo Municipio 17 kmNaguabo Municipio 24 kmCulebra Municipio 26 kmRío Grande Municipio 26 kmVieques Municipio 27 kmHumacao Municipio 33 kmCanóvanas Municipio 35 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
2:06 am AST on 26 October 2023 ()
Where
10 km (6 mi) east-northeast of Luis M. Cintron, PR · earthquakes near Luis M. Cintron
Magnitude
M 3.5 (md)
Depth
114 km below the surface
Felt
no reports yet
Nearest
Fajardo Municipio, 7 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1042 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 Luis M. Cintron, 10 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, Ramos, Luquillo, Daguao, Playa Fortuna.

How big was it?

This earthquake released about 3.2 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 53,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,400× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,700× the energy of this one
  4. This earthquake M 3.5 about 3.2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 6.7× 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

The largest earthquake within 50 km since 2016 was M 4.8 on 2021-10-08 — about 75 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 18.3350, -65.5525. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Fajardo Municipio, PR 7 km (4 mi) NNW earthquakes near Fajardo Municipio
Ceiba Municipio, PR 12 km (7 mi) SW earthquakes near Ceiba Municipio
Luquillo Municipio, PR 17 km (11 mi) WNW earthquakes near Luquillo Municipio
Naguabo Municipio, PR 24 km (15 mi) SW earthquakes near Naguabo Municipio
Culebra Municipio, PR 26 km (16 mi) E earthquakes near Culebra Municipio
Río Grande Municipio, PR 26 km (16 mi) W earthquakes near Río Grande Municipio

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

Aftershocks so far

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

  1. 3.0 11 km SE of Esperanza, Puerto Rico
  2. 2.8 10 km SW of Esperanza, Puerto Rico
  3. 2.2 0 km SSE of Isabel Segunda, Puerto Rico
  4. 2.5 5 km SE of El Negro, Puerto Rico
  5. 3.1 3 km NE of Martorell, Puerto Rico
  6. 3.5 14 km ESE of Esperanza, Puerto Rico
  7. 2.8 1 km ESE of Gurabo, Puerto Rico
  8. 3.0 31 km NE of Vieques, Puerto Rico
  9. 2.5 21 km WSW of Esperanza, Puerto Rico
  10. 3.1 5 km SW of Las Piedras, Puerto Rico
  11. 2.9 20 km NE of Luquillo, Puerto Rico
  12. 3.1 43 km NNE of Luquillo, Puerto Rico
  13. 3.2 37 km NNE of Vieques, Puerto Rico
  14. 2.9 13 km E of El Negro, Puerto Rico
  15. 2.8 10 km NNE of Isabel Segunda, 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.