QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

Earthquake near San Isidro, PR

No earthquake was likely felt in San Isidro in the 24 hours to 6:04 am AST (10:04 UTC). The last one was M 4.1, 75 km (47 mi) SE, at 5:44 am AST on 28 October 2026, estimated intensity II (weak) in town; 5 felt reports to USGS. Every earthquake near San Isidro

This page: a magnitude 2.8 earthquake was recorded in San Isidro, PR, at 9:11 pm AST on 6 March 2023 (01:11 UTC), 31 km deep.

USGS: 1 km W of San Isidro, Puerto Rico

17 km (11 mi) E of San Juan, PR · 9 km (5 mi) ESE of Carolina, PR

9:11 pm AST, Mar 6, 2023 · · 31 km deep · released about 550 lb of TNT

Every earthquake near San Isidro Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Canóvanas Municipio 7 kmCarolina Municipio 7 kmLoíza Municipio 7 kmRío Grande Municipio 11 kmTrujillo Alto Municipio 13 kmGurabo Municipio 16 kmSan Juan Municipio 18 kmJuncos Municipio 19 kmLuquillo Municipio 20 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
9:11 pm AST on 6 March 2023 ()
Where
in San Isidro, PR · earthquakes near San Isidro
Magnitude
M 2.8 (md)
Depth
31 km below the surface
Felt
no reports yet
Nearest
Canóvanas Municipio, 7 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1345 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 it was probably too small to be felt, even directly above it. 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.

Earthquakes near other towns within 30 km: Canovanas, Santa Barbara, Loíza, La Dolores, Campo Rico, Suárez.

How big was it?

This earthquake released about 550 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 28,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 19,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.7× the energy of this one
  4. This earthquake M 2.8 about 550 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 4.1 on 2019-05-02 — about 78 times the energy of this one.

Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:

  1. 5.1 3 km W of Aguas Buenas, Puerto Rico · 29 km WSW of this epicentre
  2. 5.0 3 km N of Brenas, Puerto Rico · 48 km WNW 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 18.3932, -65.8983. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Canóvanas Municipio, PR 7 km (4 mi) S earthquakes near Canóvanas Municipio
Carolina Municipio, PR 7 km (5 mi) W earthquakes near Carolina Municipio
Loíza Municipio, PR 7 km (5 mi) NW earthquakes near Loíza Municipio
Río Grande Municipio, PR 11 km (7 mi) E earthquakes near Río Grande Municipio
Trujillo Alto Municipio, PR 13 km (8 mi) WSW earthquakes near Trujillo Alto Municipio
Gurabo Municipio, PR 16 km (10 mi) SSW earthquakes near Gurabo Municipio

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

Aftershocks so far

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

  1. 3.1 37 km N of Suárez, Puerto Rico
  2. 3.0 1 km ENE of Bayamon, Puerto Rico
  3. 3.2 1 km NE of Bajandas, Puerto Rico
  4. 3.1 4 km WNW of Santa Clara, Puerto Rico
  5. 2.0 1 km NE of La Plena, Puerto Rico
  6. 3.0 3 km NE of La Plena, Puerto Rico
  7. 3.1 42 km N of Loíza, Puerto Rico
  8. 3.1 2 km SW of Santa Clara, Puerto Rico
  9. 2.4 Puerto Rico region
  10. 3.0 13 km N of Loíza, Puerto Rico
  11. 2.5 9 km SE of El Negro, Puerto Rico
  12. 2.8 4 km SE of G. L. Garcia, Puerto Rico
  13. 2.9 0 km NNW of Cataño, Puerto Rico
  14. 3.1 2 km SE of Cayey, Puerto Rico
  15. 3.4 1 km W of Punta Santiago, 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.