QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

15 km SE of Punta Santiago, Puerto Rico

· 6.0 km deep · released about 46 lb of TNT

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10 km30 km60 km120 km N Humacao Municipio 17 kmNaguabo Municipio 19 kmCeiba Municipio 20 kmVieques Municipio 22 kmYabucoa Municipio 24 kmLas Piedras Municipio 28 kmMaunabo Municipio 29 kmJuncos Municipio 33 kmLuquillo Municipio 34 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
Magnitude
M 2.1 (md)
Depth
6.0 km below the surface
Felt
no reports yet
Nearest
Humacao Municipio, 17 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2765 days ago

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

How big was it?

This earthquake released about 46 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 330,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 230,000× the energy of this one
  3. Around the size people start to feel M 3.0 21× the energy of this one
  4. This earthquake M 2.1 about 46 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.

Where

Epicentre 18.0726, -65.6350. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Humacao Municipio, PR 17 km (11 mi) ESE of here earthquakes near Humacao Municipio
Naguabo Municipio, PR 19 km (12 mi) SE of here earthquakes near Naguabo Municipio
Ceiba Municipio, PR 20 km (13 mi) S of here earthquakes near Ceiba Municipio
Vieques Municipio, PR 22 km (14 mi) WSW of here earthquakes near Vieques Municipio
Yabucoa Municipio, PR 24 km (15 mi) E of here earthquakes near Yabucoa Municipio
Las Piedras Municipio, PR 28 km (17 mi) ESE of here earthquakes near Las Piedras Municipio

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

Aftershocks so far

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

  1. 1.8 23 km SSE of Esperanza, Puerto Rico
  2. 1.9 10 km SSE of Arroyo, Puerto Rico
  3. 1.9 26 km SE of El Negro, Puerto Rico
  4. 2.2 4 km SSW of Las Piedras, Puerto Rico
  5. 2.0 30 km SE of El Negro, Puerto Rico
  6. 2.6 17 km SE of Esperanza, Puerto Rico
  7. 1.8 10 km S of Emajagua, Puerto Rico
  8. 3.0 12 km S of Esperanza, Puerto Rico
  9. 2.4 Puerto Rico region
  10. 2.5 26 km SSW of Esperanza, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.6 on 2016-12-05 — it released about 5,200 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.