QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3md

Earthquake near Esperanza, PR

No earthquake was likely felt in Esperanza in the 24 hours to 9:59 pm AST (01:59 UTC). The last one was M 2.9, 23 km (14 mi) SE, at 12:08 pm AST on 29 October 2026, estimated intensity II (weak) in town. Every earthquake near Esperanza

This page: a magnitude 3.3 earthquake was recorded 11 km (7 mi) southwest of Esperanza, PR, at 2:23 am AST on 30 March 2021 (06:23 UTC), 2.0 km deep. 1 person has reported feeling it to USGS.

USGS: 11 km SW of Esperanza, Puerto Rico

70 km (43 mi) SE of San Juan, PR · 58 km (36 mi) ESE of Caguas, PR

2:23 am AST, Mar 30, 2021 · · 2.0 km deep · released about 1.1 tons of TNT

Every earthquake near Esperanza Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Vieques Municipio 16 kmCeiba Municipio 27 kmHumacao Municipio 29 kmNaguabo Municipio 30 kmYabucoa Municipio 34 kmMaunabo Municipio 38 kmLas Piedras Municipio 39 kmFajardo Municipio 41 kmCulebra Municipio 42 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
2:23 am AST on 30 March 2021 ()
Where
11 km (7 mi) southwest of Esperanza, PR · earthquakes near Esperanza
Magnitude
M 3.3 (md)
Depth
2.0 km below the surface
Felt
1 report · strongest reported intensity III
Nearest
Vieques Municipio, 16 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1982 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 49 km (30 mi) from the epicentre. In Esperanza, 11 km away, the estimate is intensity III (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 11 km, intensity III · Isabel Segunda 18 km, intensity III · Aguas Claras 28 km, intensity II · Humacao 33 km, intensity II · Fajardo 36 km, intensity II · Emajagua 36 km, intensity II · Culebra 40 km, intensity II · Luquillo 43 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 1.1 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 6.7 150,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 6,700× the energy of this one
  3. Magna, Utah 2020 M 5.7 4,700× the energy of this one
  4. This earthquake M 3.3 about 1.1 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.4× 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 4.6 on 2016-12-05 — about 110 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 18.0208, -65.5411. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Vieques Municipio, PR 16 km (10 mi) NE earthquakes near Vieques Municipio
Ceiba Municipio, PR 27 km (17 mi) NNW earthquakes near Ceiba Municipio
Humacao Municipio, PR 29 km (18 mi) WNW earthquakes near Humacao Municipio
Naguabo Municipio, PR 30 km (18 mi) NW earthquakes near Naguabo Municipio
Yabucoa Municipio, PR 34 km (21 mi) W earthquakes near Yabucoa Municipio
Maunabo Municipio, PR 38 km (23 mi) W earthquakes near Maunabo 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. 2.9 18 km SW of Esperanza, Puerto Rico
  2. 3.1 10 km E of Culebra, Puerto Rico
  3. 2.9 13 km SE of Esperanza, Puerto Rico
  4. 2.8 17 km SSE of Esperanza, Puerto Rico
  5. 2.3 1 km WNW of Esperanza, Puerto Rico
  6. 2.5 22 km SSW of Esperanza, Puerto Rico
  7. 3.1 9 km WSW of Culebra, Puerto Rico
  8. 3.7 15 km SE of Esperanza, Puerto Rico
  9. 2.2 7 km SSE of Lamboglia, Puerto Rico
  10. 3.0 13 km SE of Esperanza, Puerto Rico
  11. 1.8 19 km SW of Esperanza, Puerto Rico
  12. 3.2 18 km SE of Esperanza, Puerto Rico
  13. 3.2 Puerto Rico region
  14. 2.7 8 km SE of Esperanza, Puerto Rico
  15. 2.5 23 km SW 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.