QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0md

63 km N of Hatillo, Puerto Rico

Yes. A magnitude 3.0 earthquake was recorded 63 km N of Hatillo, Puerto Rico, at 10:21 pm AST on 30 April 2021 (02:21 UTC), 33 km deep.

· 33 km deep · released about 860 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Quebradillas Municipio 68 kmIsabela Municipio 68 kmCamuy Municipio 69 kmHatillo Municipio 69 kmBarceloneta Municipio 70 kmArecibo Municipio 71 kmAguadilla Municipio 74 kmManatí Municipio 76 kmVega Baja Municipio 79 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
Magnitude
M 3.0 (md)
Depth
33 km below the surface
Felt
no reports yet
Nearest
Quebradillas Municipio, 68 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2021 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 13 km (8 mi) from the epicentre. 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.

How big was it?

This earthquake released about 860 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 390,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 18,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 12,000× the energy of this one
  4. This earthquake M 3.0 about 860 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 6.0 on 2019-09-24 — about 35,000 times the energy of this one.

Before 2016, the USGS record lists 14 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.7 45 km N of San Antonio, Puerto Rico · 38 km WSW of this epicentre
  2. 6.4 61 km N of Hatillo, Puerto Rico · 2 km SW of this epicentre
  3. 6.0 81 km N of Isabela, Puerto Rico · 23 km NW of this epicentre
  4. 6.0 67 km NNW of San Antonio, Puerto Rico · 48 km W of this epicentre
  5. 5.9 78 km N of Arecibo, Puerto Rico · 20 km NE 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 19.0610, -66.7968. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Quebradillas Municipio, PR 68 km (42 mi) SSW earthquakes near Quebradillas Municipio
Isabela Municipio, PR 68 km (42 mi) SSW earthquakes near Isabela Municipio
Camuy Municipio, PR 69 km (43 mi) S earthquakes near Camuy Municipio
Hatillo Municipio, PR 69 km (43 mi) S earthquakes near Hatillo Municipio
Barceloneta Municipio, PR 70 km (44 mi) SSE earthquakes near Barceloneta Municipio
Arecibo Municipio, PR 71 km (44 mi) S earthquakes near Arecibo 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. 3.4 80 km N of Tierras Nuevas Poniente, Puerto Rico
  2. 3.5 72 km N of Tierras Nuevas Poniente, Puerto Rico
  3. 3.5 74 km N of Tierras Nuevas Poniente, Puerto Rico
  4. 3.0 35 km N of Tierras Nuevas Poniente, Puerto Rico
  5. 3.0 Puerto Rico region
  6. 3.4 97 km N of Isabela, Puerto Rico
  7. 3.4 22 km NNE of Isabela, Puerto Rico
  8. 3.2 67 km N of Tierras Nuevas Poniente, Puerto Rico
  9. 3.4 61 km N of Arecibo, Puerto Rico
  10. 3.1 68 km N of Arecibo, Puerto Rico
  11. 3.4 80 km N of Isabela, Puerto Rico
  12. 3.5 72 km N of Hatillo, Puerto Rico
  13. 3.3 Mona Passage
  14. 3.7 61 km N of Isabela, Puerto Rico
  15. 3.3 98 km N of Isabela, 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.