QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

Earthquake near Humacao, PR

No earthquake was likely felt in Humacao in the 24 hours to 4:35 pm AST (20:35 UTC). The last one was M 4.1, 56 km (35 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 Humacao

This page: a magnitude 2.5 earthquake was recorded 47 km (29 mi) south-southeast of Humacao, PR, at 9:07 pm AST on 22 November 2020 (01:07 UTC), 8.0 km deep.

USGS: 34 km SSE of Emajagua, Puerto Rico

83 km (51 mi) SSE of San Juan, PR

9:07 pm AST, Nov 22, 2020 · · 8.0 km deep · released about 180 lb of TNT

Every earthquake near Humacao Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Maunabo Municipio 35 kmYabucoa Municipio 39 kmPatillas Municipio 41 kmArroyo Municipio 43 kmHumacao Municipio 45 kmGuayama Municipio 52 kmVieques Municipio 53 kmLas Piedras Municipio 53 kmNaguabo Municipio 53 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
9:07 pm AST on 22 November 2020 ()
Where
47 km (29 mi) south-southeast of Humacao, PR · earthquakes near Humacao
Magnitude
M 2.5 (md)
Depth
8.0 km below the surface
Felt
no reports yet
Nearest
Maunabo Municipio, 35 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2180 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 21 km (13 mi) from the epicentre. In Humacao, 47 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.

How big was it?

This earthquake released about 180 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 86,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 61,000× the energy of this one
  3. Around the size people start to feel M 3.0 5.4× the energy of this one
  4. This earthquake M 2.5 about 180 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 4.6 on 2016-12-05 — about 1,400 times the energy of this one.

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

  1. 5.3 68 km SSE of Emajagua, Puerto Rico · 38 km S 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 17.7375, -65.7158. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Maunabo Municipio, PR 35 km (22 mi) NNW earthquakes near Maunabo Municipio
Yabucoa Municipio, PR 39 km (24 mi) NNW earthquakes near Yabucoa Municipio
Patillas Municipio, PR 41 km (25 mi) NW earthquakes near Patillas Municipio
Arroyo Municipio, PR 43 km (27 mi) NW earthquakes near Arroyo Municipio
Humacao Municipio, PR 45 km (28 mi) N earthquakes near Humacao Municipio
Guayama Municipio, PR 52 km (32 mi) WNW earthquakes near Guayama Municipio

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

Aftershocks so far

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

  1. 3.5 72 km SSE of Emajagua, Puerto Rico
  2. 2.7 23 km ESE of El Negro, Puerto Rico
  3. 2.8 11 km S of Emajagua, Puerto Rico
  4. 3.2 27 km S of Esperanza, Puerto Rico
  5. 3.0 29 km SE of Emajagua, Puerto Rico
  6. 3.0 3 km SSE of Lamboglia, Puerto Rico
  7. 3.0 19 km S of Esperanza, Puerto Rico
  8. 3.4 23 km SSE of Esperanza, Puerto Rico
  9. 3.0 11 km W of Esperanza, Puerto Rico
  10. 2.8 6 km N of Martorell, Puerto Rico
  11. 3.0 54 km SE of Emajagua, Puerto Rico
  12. 1.6 8 km SSW of Arroyo, Puerto Rico
  13. 1.8 8 km S of Palo Seco, Puerto Rico
  14. 3.2 30 km SE of Emajagua, Puerto Rico
  15. 2.3 3 km SE of Jobos, 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.