Earthquake · reviewed by a seismologist
M 2.8ml
17km S of Progreso, B.C., MX
Yes. A magnitude 2.8 earthquake was recorded 17km S of Progreso, B.C., MX, at 5:02 pm PDT on 21 April 2017 (00:02 UTC), less than 1 km deep. 3 people have reported feeling it to USGS.
- When
- Magnitude
- M 2.8 (ml)
- Depth
- -0.0 km below the surface
- Felt
- 3 reports · strongest reported intensity II
- Nearest
- Imperial County, 71 km NNE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3467 days ago
Earthquake alerts for Calexico, 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 26 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.
Earthquakes near other towns within 30 km: Calexico.
How big was it?
This earthquake released about 400 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 38,000× the energy of this one
- Magna, Utah 2020 M 5.7 27,000× the energy of this one
- Around the size people start to feel M 3.0 2.4× the energy of this one
- This earthquake M 2.8 about 400 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 32.4255, -115.5513. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Imperial County, CA | 71 km (44 mi) | NNE | earthquakes near Imperial County |
| San Diego County, CA | 132 km (82 mi) | WNW | earthquakes near San Diego County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
57 earthquakes have been recorded within 50 km since this one.
- 1.7 7km W of Progreso, B.C., MX
- 1.8 21km SSW of Puebla, B.C., MX
- 2.1 14km ESE of Puebla, B.C., MX
- 1.8 14km ESE of Puebla, B.C., MX
- 3.3 10km NW of Delta, B.C., MX
- 1.6 6km ENE of Imperial, CA
- 1.8 7km SW of Holtville, CA
- 1.7 8km SW of Holtville, CA
- 1.7 7km SW of Holtville, CA
- 1.7 8km SW of Holtville, CA
- 2.2 17km W of Delta, B.C., MX
- 2.0 8km SSW of Progreso, B.C., MX
- 1.9 4km WSW of Progreso, B.C., MX
- 2.2 7km WNW of Alberto Oviedo Mota, B.C., MX
- 2.1 2km ESE of Delta, 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.