QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3md

Earthquake near Isabel Segunda, PR

No earthquake was likely felt in Isabel Segunda in the 24 hours to 4:25 pm AST (20:25 UTC). The last one was M 2.9, 26 km (16 mi) SSE, at 12:08 pm AST on 29 October 2026, estimated intensity II (weak) in town. Every earthquake near Isabel Segunda

This page: a magnitude 3.3 earthquake was recorded 35 km (22 mi) southeast of Isabel Segunda, PR, at 1:21 am AST on 15 June 2024 (05:21 UTC), 5.1 km deep.

USGS: 34 km ESE of Esperanza, Puerto Rico

1:21 am AST, Jun 15, 2024 · · 5.1 km deep · released about 1.5 tons of TNT

Every earthquake near Isabel Segunda Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Vieques Municipio 32 kmCulebra Municipio 43 kmCeiba Municipio 57 kmFajardo Municipio 64 kmNaguabo Municipio 65 kmHumacao Municipio 67 kmLuquillo Municipio 72 kmYabucoa Municipio 72 kmMaunabo Municipio 76 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
1:21 am AST on 15 June 2024 ()
Where
35 km (22 mi) southeast of Isabel Segunda, PR · earthquakes near Isabel Segunda
Magnitude
M 3.3 (md)
Depth
5.1 km below the surface
Felt
no reports yet
Nearest
Vieques Municipio, 32 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 880 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, people at rest would likely notice it out to about 53 km (33 mi) from the epicentre. In Isabel Segunda, 35 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: Esperanza 34 km, intensity II · Isabel Segunda 35 km, intensity II · Culebra 41 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 1.5 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 110,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 5,100× the energy of this one
  3. Magna, Utah 2020 M 5.7 3,600× the energy of this one
  4. This earthquake M 3.3 about 1.5 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 3.1× 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 160 times the energy of this one.

Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:

  1. 5.0 29 km S of Cruz Bay, U.S. Virgin Islands · 47 km ENE 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 17.9553, -65.1833. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Vieques Municipio, PR 32 km (20 mi) NW earthquakes near Vieques Municipio
Culebra Municipio, PR 43 km (27 mi) NNW earthquakes near Culebra Municipio
Ceiba Municipio, PR 57 km (35 mi) NW earthquakes near Ceiba Municipio
Fajardo Municipio, PR 64 km (40 mi) NW earthquakes near Fajardo Municipio
Naguabo Municipio, PR 65 km (40 mi) WNW earthquakes near Naguabo Municipio
Humacao Municipio, PR 67 km (42 mi) WNW earthquakes near Humacao Municipio

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

Aftershocks so far

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

  1. 2.1 18 km WSW of Esperanza, Puerto Rico
  2. 3.3 16 km WSW of Esperanza, Puerto Rico
  3. 2.7 24 km S of Esperanza, Puerto Rico
  4. 2.6 11 km SE of Esperanza, Puerto Rico
  5. 2.7 8 km ESE of Esperanza, Puerto Rico
  6. 2.8 4 km SE of Esperanza, Puerto Rico
  7. 2.6 24 km SSW of Esperanza, Puerto Rico
  8. 2.7 27 km S of Charlotte Amalie, U.S. Virgin Islands
  9. 3.3 31 km SSE of Esperanza, Puerto Rico
  10. 3.4 22 km SSW of Cruz Bay, U.S. Virgin Islands
  11. 3.2 32 km SE of Esperanza, Puerto Rico
  12. 3.1 23 km SE of Culebra, Puerto Rico
  13. 3.1 18 km S of Cruz Bay, U.S. Virgin Islands
  14. 2.5 2 km SE of Esperanza, Puerto Rico
  15. 2.6 37 km S of Esperanza, 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.