QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

Earthquake near Punta Santiago, PR

No earthquake was likely felt in Punta Santiago in the 24 hours to 10:13 am AST (14:13 UTC). The last one was M 4.1, 49 km (31 mi) ESE, at 5:44 am AST on 28 October 2026, estimated intensity II (weak) in town; 5 felt reports to USGS. Every earthquake near Punta Santiago

This page: a magnitude 2.3 earthquake was recorded 6 km (4 mi) south of Punta Santiago, PR, at 5:22 am AST on 3 September 2023 (09:22 UTC), 20 km deep.

USGS: 6 km S of Punta Santiago, Puerto Rico

47 km (29 mi) SE of San Juan, PR · 34 km (21 mi) ESE of Caguas, PR

5:22 am AST, Sep 3, 2023 · · 20 km deep · released about 77 lb of TNT

Every earthquake near Punta Santiago Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Humacao Municipio 5 kmNaguabo Municipio 11 kmYabucoa Municipio 13 kmLas Piedras Municipio 16 kmMaunabo Municipio 20 kmCeiba Municipio 21 kmJuncos Municipio 21 kmSan Lorenzo Municipio 25 kmPatillas Municipio 28 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
5:22 am AST on 3 September 2023 ()
Where
6 km (4 mi) south of Punta Santiago, PR · earthquakes near Punta Santiago
Magnitude
M 2.3 (md)
Depth
20 km below the surface
Felt
no reports yet
Nearest
Humacao Municipio, 5 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1165 days ago

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

At this magnitude and depth it was probably too small to be felt, even directly above it. In Punta Santiago, 6 km away, the estimate is intensity II (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.

Earthquakes near other towns within 30 km: Bajandas, Candelero Arriba, Humacao, Comunas, Antón Ruiz, Naguabo.

How big was it?

This earthquake released about 77 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 140,000× the energy of this one
  3. Around the size people start to feel M 3.0 12× the energy of this one
  4. This earthquake M 2.3 about 77 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 4.8 on 2021-10-08 — about 6,200 times the energy of this one.

Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:

  1. 5.1 3 km W of Aguas Buenas, Puerto Rico · 44 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 18.1090, -65.7460. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Humacao Municipio, PR 5 km (3 mi) NW earthquakes near Humacao Municipio
Naguabo Municipio, PR 11 km (7 mi) N earthquakes near Naguabo Municipio
Yabucoa Municipio, PR 13 km (8 mi) WSW earthquakes near Yabucoa Municipio
Las Piedras Municipio, PR 16 km (10 mi) WNW earthquakes near Las Piedras Municipio
Maunabo Municipio, PR 20 km (12 mi) SW earthquakes near Maunabo Municipio
Ceiba Municipio, PR 21 km (13 mi) NE earthquakes near Ceiba Municipio

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

Aftershocks so far

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

  1. 2.5 10 km S of Emajagua, Puerto Rico
  2. 3.2 36 km SE of Emajagua, Puerto Rico
  3. 2.5 2 km SSE of Caguas, Puerto Rico
  4. 2.0 Puerto Rico region
  5. 2.8 1 km SSW of Cidra, Puerto Rico
  6. 3.3 4 km ENE of Guaynabo, Puerto Rico
  7. 2.6 Puerto Rico region
  8. 3.1 10 km S of Lamboglia, Puerto Rico
  9. 3.3 25 km SE of El Negro, Puerto Rico
  10. 2.5 Puerto Rico region
  11. 2.5 16 km SE of El Negro, 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.