Earthquake · reviewed by a seismologist
M 1.9ml
31km E of Primo Tapia, B.C., MX
Yes. A magnitude 1.9 earthquake was recorded 31km E of Primo Tapia, B.C., MX, 84 km (52 mi) SE of San Diego, CA, at 11:50 am PDT on 4 April 2018 (18:50 UTC), 17 km deep.
84 km (52 mi) SE of San Diego, CA
- When
- Magnitude
- M 1.9 (ml)
- Depth
- 17 km below the surface
- Felt
- no reports yet
- Nearest
- San Diego County, 91 km N
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3031 days ago
Earthquake alerts for Campo, CA
Get a notification in this browser when USGS records an earthquake near Campo, CA. No account or email needed.
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 minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth it was probably too small to be felt, even directly above it. 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 19 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 810,000× the energy of this one
- Magna, Utah 2020 M 5.7 580,000× the energy of this one
- Around the size people start to feel M 3.0 51× the energy of this one
- This earthquake M 1.9 about 19 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 32.2165, -116.5917. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Diego County, CA | 91 km (57 mi) | N | earthquakes near San Diego County |
| Imperial County, CA | 148 km (92 mi) | NE | earthquakes near Imperial County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
43 earthquakes have been recorded within 50 km since this one.
- 2.5 32km NE of Ensenada, B.C., MX
- 1.7 27km ESE of Primo Tapia, B.C., MX
- 1.5 27km ESE of Primo Tapia, B.C., MX
- 2.0 47km ENE of Ensenada, B.C., MX
- 1.8 34km ENE of Ensenada, B.C., MX
- 2.1 43km SSE of Campo, CA
- 2.0 23km NE of Primo Tapia, B.C., MX
- 3.0 34km NE of Ensenada, B.C., MX
- 1.6 41km SSE of Tecate, B.C., MX
- 1.9 21km S of Primo Tapia, B.C., MX
- 2.6 38km SSE of Tecate, B.C., MX
- 2.2 32km E of Primo Tapia, B.C., MX
- 1.6 25km ENE of Primo Tapia, B.C., MX
- 2.1 34km ENE of Ensenada, B.C., MX
- 2.1 32km NE of Ensenada, 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.