QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9md

Earthquake near Emajagua, PR

No earthquake was likely felt in Emajagua in the 24 hours to 1:02 pm AST (17:02 UTC). The last one was M 2.2, 7 km (5 mi) ESE, at 2:59 pm AST on 4 November 2026, estimated intensity II (weak) in town. Every earthquake near Emajagua

This page: a magnitude 2.9 earthquake was recorded 23 km (14 mi) southeast of Emajagua, PR, at 5:08 am AST on 10 October 2020 (09:08 UTC), 4.0 km deep. 2 people have reported feeling it to USGS.

USGS: 23 km SE of Emajagua, Puerto Rico

70 km (43 mi) SSE of San Juan, PR · 53 km (33 mi) SE of Caguas, PR

5:08 am AST, Oct 10, 2020 · · 4.0 km deep · released about 750 lb of TNT

Every earthquake near Emajagua Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Maunabo Municipio 24 kmYabucoa Municipio 26 kmHumacao Municipio 30 kmPatillas Municipio 33 kmNaguabo Municipio 37 kmArroyo Municipio 37 kmLas Piedras Municipio 38 kmVieques Municipio 39 kmSan Lorenzo Municipio 41 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
5:08 am AST on 10 October 2020 ()
Where
23 km (14 mi) southeast of Emajagua, PR · earthquakes near Emajagua
Magnitude
M 2.9 (md)
Depth
4.0 km below the surface
Felt
2 reports · strongest reported intensity II
Nearest
Maunabo Municipio, 24 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1556 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 33 km (21 mi) from the epicentre. In Emajagua, 23 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.

Likely felt in: Emajagua 23 km, intensity II · Humacao 33 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 750 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 20,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 14,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.3× the energy of this one
  4. This earthquake M 2.9 about 750 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 320 times the energy of this one.

Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.

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 17.8828, -65.7005. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Maunabo Municipio, PR 24 km (15 mi) WNW earthquakes near Maunabo Municipio
Yabucoa Municipio, PR 26 km (16 mi) NW earthquakes near Yabucoa Municipio
Humacao Municipio, PR 30 km (18 mi) NNW earthquakes near Humacao Municipio
Patillas Municipio, PR 33 km (20 mi) WNW earthquakes near Patillas Municipio
Naguabo Municipio, PR 37 km (23 mi) N earthquakes near Naguabo Municipio
Arroyo Municipio, PR 37 km (23 mi) WNW earthquakes near Arroyo Municipio

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

Aftershocks so far

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

  1. 2.3 3 km NNE of Olimpo, Puerto Rico
  2. 2.8 6 km N of Martorell, Puerto Rico
  3. 3.0 54 km SE of Emajagua, Puerto Rico
  4. 1.6 8 km SSW of Arroyo, Puerto Rico
  5. 1.8 8 km S of Palo Seco, Puerto Rico
  6. 3.2 30 km SE of Emajagua, Puerto Rico
  7. 2.0 4 km SSE of G. L. Garcia, Puerto Rico
  8. 2.3 3 km SE of Jobos, Puerto Rico
  9. 3.3 11 km SW of Esperanza, Puerto Rico
  10. 3.7 9 km SW of Esperanza, Puerto Rico
  11. 2.8 14 km SSE of Lamboglia, Puerto Rico
  12. 2.4 23 km SE of Emajagua, Puerto Rico
  13. 2.7 22 km SE of El Negro, Puerto Rico
  14. 3.4 26 km S of Esperanza, Puerto Rico
  15. 2.5 24 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.