QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5md

91 km NNW of San Antonio, Puerto Rico

Yes. A magnitude 3.5 earthquake was recorded 91 km NNW of San Antonio, Puerto Rico, at 7:00 am AST on 12 March 2022 (11:00 UTC), 25 km deep.

· 25 km deep · released about 2.3 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Aguadilla Municipio 92 kmIsabela Municipio 97 kmAguada Municipio 101 kmQuebradillas Municipio 103 kmRincón Municipio 104 kmMoca Municipio 105 kmCamuy Municipio 108 kmAñasco Municipio 112 kmHatillo Municipio 113 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 3.5 (md)
Depth
25 km below the surface
Felt
no reports yet
Nearest
Aguadilla Municipio, 92 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1705 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 55 km (34 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 2.3 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 75,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 3,300× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,400× the energy of this one
  4. This earthquake M 3.5 about 2.3 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4.7× 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 6.0 on 2019-09-24 — about 6,700 times the energy of this one.

Before 2016, the USGS record lists 10 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.8 94 km NE of Punta Cana, Dominican Republic · 32 km WSW of this epicentre
  2. 6.0 93 km NNW of San Antonio, Puerto Rico · 17 km ENE of this epicentre
  3. 6.0 67 km NNW of San Antonio, Puerto Rico · 27 km SE of this epicentre
  4. 5.7 88 km N of San Antonio, Puerto Rico · 20 km E of this epicentre
  5. 5.5 55 km NNW of San Antonio, Puerto Rico · 36 km SSE 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 19.2560, -67.4366. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Aguadilla Municipio, PR 92 km (57 mi) SSE earthquakes near Aguadilla Municipio
Isabela Municipio, PR 97 km (60 mi) SSE earthquakes near Isabela Municipio
Aguada Municipio, PR 101 km (63 mi) SSE earthquakes near Aguada Municipio
Quebradillas Municipio, PR 103 km (64 mi) SSE earthquakes near Quebradillas Municipio
Rincón Municipio, PR 104 km (65 mi) S earthquakes near Rincón Municipio
Moca Municipio, PR 105 km (65 mi) SSE earthquakes near Moca Municipio

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

Aftershocks so far

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

  1. 3.4 97 km NW of San Antonio, Puerto Rico
  2. 2.8 42 km NNW of San Antonio, Puerto Rico
  3. 2.8 Mona Passage
  4. 3.4 70 km N of Isabela, Puerto Rico
  5. 3.8 92 km NNW of San Antonio, Puerto Rico
  6. 3.8 91 km NE of Punta Cana, Dominican Republic
  7. 3.7 94 km N of San Antonio, Puerto Rico
  8. 3.8 117 km NNW of San Antonio, Puerto Rico
  9. 3.2 48 km N of San Antonio, Puerto Rico
  10. 2.9 44 km NNW of San Antonio, Puerto Rico
  11. 3.4 77 km NW of San Antonio, Puerto Rico
  12. 3.2 101 km NW of San Antonio, Puerto Rico
  13. 3.4 67 km NNW of San Antonio, Puerto Rico
  14. 3.5 68 km NNW of San Antonio, Puerto Rico
  15. 3.6 75 km NW of Aguadilla, 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.