Earthquake · reviewed by a seismologist
M 2.5ml
5km WSW of Primo Tapia, B.C., MX
Yes. A magnitude 2.5 earthquake was recorded 5km WSW of Primo Tapia, B.C., MX, 69 km (43 mi) SSE of San Diego, CA, at 3:09 am PDT on 6 August 2021 (10:09 UTC), 15 km deep.
69 km (43 mi) SSE of San Diego, CA · 47 km (29 mi) S of Chula Vista, CA
- When
- Magnitude
- M 2.5 (ml)
- Depth
- 15 km below the surface
- Felt
- no reports yet
- Nearest
- San Diego County, 92 km N
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1846 days ago
Earthquake alerts for Imperial Beach, CA
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
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 17 km (11 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 180 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 83,000× the energy of this one
- Magna, Utah 2020 M 5.7 59,000× the energy of this one
- Around the size people start to feel M 3.0 5.2× the energy of this one
- This earthquake M 2.5 about 180 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 32.2107, -116.9678. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Diego County, CA | 92 km (57 mi) | N | earthquakes near San Diego County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
58 earthquakes have been recorded within 50 km since this one.
- 1.6 5km SE of Chula Vista, CA
- 2.4 19km WSW of Primo Tapia, B.C., MX
- 1.7 5km NNE of San Ysidro, CA
- 2.0 14km NNW of El Sauzal, B.C., MX
- 1.7 5km SE of Chula Vista, CA
- 3.6 46km SW of Primo Tapia, B.C., MX
- 1.9 11km W of El Sauzal, B.C., MX
- 2.5 24km WNW of El Sauzal, B.C., MX
- 1.7 10km W of El Sauzal, B.C., MX
- 1.9 9km WNW of El Sauzal, B.C., MX
- 2.3 8km W of El Sauzal, B.C., MX
- 1.8 10km W of El Sauzal, B.C., MX
- 1.9 8km W of El Sauzal, B.C., MX
- 4.3 7km W of El Sauzal, B.C., MX
- 2.5 10km W of El Sauzal, B.C., MX
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
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.