QuakeIndex

quarry blast · reviewed by a seismologist

M 1.6ml

1km WSW of Tijuana, B.C., MX

12 km (7 mi) S of Chula Vista, CA · 34 km (21 mi) SSE of San Diego, CA

· -0.2 km deep · released about 6.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Diego County 61 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 1.6 (ml)
Depth
-0.2 km below the surface
Felt
no reports yet
Nearest
San Diego County, 61 km NNE
Nearest mapped fault
Newport-Inglewood-Rose Canyon fault, 11 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3454 days ago

A magnitude 1.6 earthquake was recorded 1km WSW of Tijuana, B.C., MX at 20:57 UTC on 2017-04-18. This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

Earthquakes near other towns within 30 km: Imperial Beach, Chula Vista, Bonita, National City, La Presa, Coronado.

USGS catalogues this as quarry blast, not an earthquake.

How big was it?

This earthquake released about 6.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,600,000× the energy of this one
  3. Around the size people start to feel M 3.0 140× the energy of this one
  4. This earthquake M 1.6 about 6.6 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 32.5235, -117.0333. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
San Diego County, CA 61 km (38 mi) NNE earthquakes near San Diego County

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

Aftershocks so far

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

  1. 1.6 25km ENE of Primo Tapia, B.C., MX
  2. 1.7 6km N of Lakeside, CA
  3. 1.6 6km SE of Bostonia, CA
  4. 1.7 7km NNW of Lakeside, CA
  5. 1.5 5km NE of Rancho San Diego, CA
  6. 1.9 29km SW of La Jolla, CA
  7. 1.7 6km NNW of Lakeside, CA
  8. 1.6 5km NE of Rancho San Diego, CA
  9. 1.6 14km WSW of Coronado, CA
  10. 1.8 6km N of La Jolla, CA
  11. 2.3 6km NNW of La Jolla, CA
  12. 1.6 6km NNW of Lakeside, CA
  13. 1.6 16km SW of La Jolla, CA
  14. 1.8 34km WSW of Coronado, CA
  15. 3.5 35km WSW of Coronado, CA

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.