QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

57 km SW of Pole Ojea, Puerto Rico

Yes. A magnitude 2.7 earthquake was recorded 57 km SW of Pole Ojea, Puerto Rico, at 4:30 am AST on 30 July 2018 (08:30 UTC), 4.0 km deep.

· 4.0 km deep · released about 360 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cabo Rojo Municipio 60 kmLajas Municipio 68 kmMayagüez Municipio 71 kmGuánica Municipio 76 kmHormigueros Municipio 77 kmSan Germán Municipio 79 kmSabana Grande Municipio 84 kmGuayanilla Municipio 90 kmYauco Municipio 91 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 2.7 (md)
Depth
4.0 km below the surface
Felt
no reports yet
Nearest
Cabo Rojo Municipio, 60 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3027 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 25 km (16 mi) from the epicentre. 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 360 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 42,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 30,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.6× the energy of this one
  4. This earthquake M 2.7 about 360 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

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

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 17.5530, -67.5068. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Cabo Rojo Municipio, PR 60 km (37 mi) NE earthquakes near Cabo Rojo Municipio
Lajas Municipio, PR 68 km (43 mi) NE earthquakes near Lajas Municipio
Mayagüez Municipio, PR 71 km (44 mi) NW earthquakes near Mayagüez Municipio
Guánica Municipio, PR 76 km (47 mi) NE earthquakes near Guánica Municipio
Hormigueros Municipio, PR 77 km (48 mi) NNE earthquakes near Hormigueros Municipio
San Germán Municipio, PR 79 km (49 mi) NE earthquakes near San Germán Municipio

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

Aftershocks so far

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

  1. 2.3 17 km W of Pole Ojea, Puerto Rico
  2. 2.0 17 km S of Pole Ojea, Puerto Rico
  3. 2.1 15 km S of Pole Ojea, Puerto Rico
  4. 1.9 17 km S of Pole Ojea, Puerto Rico
  5. 2.3 17 km SW of Pole Ojea, Puerto Rico
  6. 2.9 20 km WSW of Pole Ojea, Puerto Rico
  7. 2.8 33 km W of Pole Ojea, Puerto Rico
  8. 2.3 20 km SSE of Pole Ojea, Puerto Rico
  9. 3.1 89 km WSW of Pole Ojea, Puerto Rico
  10. 3.0 73 km SW of Pole Ojea, Puerto Rico
  11. 2.4 22 km W of Pole Ojea, Puerto Rico
  12. 1.6 11 km S of Pole Ojea, 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.