QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2md

Earthquake near Humacao, PR

No earthquake was likely felt in Humacao in the 24 hours to 3:32 pm AST (19:32 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 2.2 earthquake was recorded 38 km (24 mi) southeast of Humacao, PR, at 9:31 pm AST on 10 July 2017 (01:31 UTC), 13 km deep.

USGS: Puerto Rico region

76 km (47 mi) SE of San Juan, PR

9:31 pm AST, Jul 10, 2017 · · 13 km deep · released about 56 lb of TNT

Every earthquake near Humacao Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Maunabo Municipio 33 kmYabucoa Municipio 33 kmHumacao Municipio 35 kmVieques Municipio 35 kmNaguabo Municipio 40 kmPatillas Municipio 41 kmCeiba Municipio 43 kmLas Piedras Municipio 44 kmArroyo Municipio 46 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
9:31 pm AST on 10 July 2017 ()
Where
38 km (24 mi) southeast of Humacao, PR · earthquakes near Humacao
Magnitude
M 2.2 (md)
Depth
13 km below the surface
Felt
no reports yet
Nearest
Maunabo Municipio, 33 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3411 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 13 km (8 mi) from the epicentre. In Humacao, 38 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 56 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 270,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 190,000× the energy of this one
  3. Around the size people start to feel M 3.0 17× the energy of this one
  4. This earthquake M 2.2 about 56 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 in our catalogue was M 4.6 on 2016-12-05 — about 4,300 times the energy of this one.

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 17.8638, -65.6241. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Maunabo Municipio, PR 33 km (20 mi) WNW earthquakes near Maunabo Municipio
Yabucoa Municipio, PR 33 km (21 mi) NW earthquakes near Yabucoa Municipio
Humacao Municipio, PR 35 km (22 mi) NNW earthquakes near Humacao Municipio
Vieques Municipio, PR 35 km (22 mi) NE earthquakes near Vieques Municipio
Naguabo Municipio, PR 40 km (25 mi) NNW earthquakes near Naguabo Municipio
Patillas Municipio, PR 41 km (26 mi) WNW earthquakes near Patillas Municipio

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

Aftershocks so far

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

  1. 2.8 18 km SSE of Arroyo, Puerto Rico
  2. 1.6 20 km S of Arroyo, Puerto Rico
  3. 2.5 21 km SE of Esperanza, Puerto Rico
  4. 2.6 9 km SSE of Aguas Claras, Puerto Rico
  5. 3.1 12 km SE of Punta Santiago, Puerto Rico
  6. 2.7 2 km NW of Candelero Arriba, Puerto Rico
  7. 2.6 16 km SSE of Punta Santiago, Puerto Rico
  8. 3.1 2 km ENE of Candelero Arriba, Puerto Rico
  9. 2.3 3 km NNW of Patillas, Puerto Rico
  10. 3.0 26 km SSW of Esperanza, Puerto Rico
  11. 2.6 2 km NNW of El Negro, Puerto Rico
  12. 2.8 1 km NNE of Yabucoa, Puerto Rico
  13. 3.2 4 km WNW of Aguas Claras, Puerto Rico
  14. 2.9 33 km SE of Emajagua, Puerto Rico
  15. 2.0 17 km SE of Emajagua, 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.