QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

81 km NNE of Suárez, Puerto Rico

Yes. A magnitude 2.1 earthquake was recorded 81 km NNE of Suárez, Puerto Rico, 92 km (57 mi) NNE of San Juan, PR, at 12:20 am AST on 24 September 2019 (04:20 UTC), 11 km deep. 1 person has reported feeling it to USGS.

92 km (57 mi) NNE of San Juan, PR

· 11 km deep · released about 51 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Loíza Municipio 82 kmFajardo Municipio 85 kmRío Grande Municipio 86 kmLuquillo Municipio 86 kmCarolina Municipio 88 kmSan Juan Municipio 90 kmCataño Municipio 92 kmCanóvanas Municipio 93 kmToa Baja Municipio 94 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 2.1 (md)
Depth
11 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Loíza Municipio, 82 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2605 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 14 km (9 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 51 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 210,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 51 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 4.5 on 2018-03-06 — about 3,300 times the energy of this one.

Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:

  1. 5.1 122 km NNE of Vieques, Puerto Rico · 48 km NE of this epicentre
  2. 5.1 92 km N of Suárez, Puerto Rico · 14 km NNW of this epicentre
  3. 5.0 73 km NNE of Vieques, Puerto Rico · 24 km SE 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 19.1426, -65.6763. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Loíza Municipio, PR 82 km (51 mi) SSW earthquakes near Loíza Municipio
Fajardo Municipio, PR 85 km (53 mi) S earthquakes near Fajardo Municipio
Río Grande Municipio, PR 86 km (54 mi) S earthquakes near Río Grande Municipio
Luquillo Municipio, PR 86 km (54 mi) S earthquakes near Luquillo Municipio
Carolina Municipio, PR 88 km (55 mi) SSW earthquakes near Carolina Municipio
San Juan Municipio, PR 90 km (56 mi) SSW earthquakes near San Juan Municipio

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

Aftershocks so far

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

  1. 3.1 58 km N of Loíza, Puerto Rico
  2. 2.7 43 km N of Loíza, Puerto Rico
  3. 2.9 65 km N of Suárez, Puerto Rico
  4. 2.9 69 km N of Suárez, Puerto Rico
  5. 3.0 67 km N of Suárez, Puerto Rico
  6. 2.8 63 km N of Suárez, Puerto Rico
  7. 2.9 58 km N of Loíza, Puerto Rico
  8. 2.9 67 km N of Suárez, Puerto Rico
  9. 2.7 62 km N of Suárez, Puerto Rico
  10. 3.0 62 km N of Culebra, Puerto Rico
  11. 3.1 106 km NNW of Charlotte Amalie, U.S. Virgin Islands
  12. 2.6 64 km N of Suárez, Puerto Rico
  13. 2.6 54 km N of Suárez, Puerto Rico
  14. 2.0 65 km N of Suárez, Puerto Rico
  15. 3.1 70 km N of Suárez, 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.