Earthquake · reviewed by a seismologist
M 2.4ml
31km E of Primo Tapia, B.C., MX
Yes. A magnitude 2.4 earthquake was recorded 31km E of Primo Tapia, B.C., MX, 83 km (52 mi) SE of San Diego, CA, at 9:57 pm PDT on 24 September 2018 (04:57 UTC), 12 km deep.
83 km (52 mi) SE of San Diego, CA
- When
- Magnitude
- M 2.4 (ml)
- Depth
- 12 km below the surface
- Felt
- no reports yet
- Nearest
- San Diego County, 90 km N
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2942 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, people at rest would likely notice it out to about 18 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 140 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 110,000× the energy of this one
- Magna, Utah 2020 M 5.7 78,000× the energy of this one
- Around the size people start to feel M 3.0 6.9× the energy of this one
- This earthquake M 2.4 about 140 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
The largest earthquake within 50 km in our catalogue was M 4.2 on 2018-07-25 — about 420 times the energy of this one.
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 32.2253, -116.5883. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Diego County, CA | 90 km (56 mi) | N | earthquakes near San Diego County |
| Imperial County, CA | 147 km (91 mi) | NE | earthquakes near Imperial County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
36 earthquakes have been recorded within 50 km since this one.
- 2.1 44km ENE of Ensenada, B.C., MX
- 1.8 27 km S of Tecate, B.C., MX
- 2.2 21km NE of Ensenada, B.C., MX
- 1.6 16km WSW of Tecate, B.C., MX
- 2.4 7km ENE of El Sauzal, B.C., MX
- 1.7 42km ENE of Ensenada, B.C., MX
- 2.7 24km ESE of Primo Tapia, B.C., MX
- 1.9 36km E of Ensenada, B.C., MX
- 1.6 21km NE of Primo Tapia, B.C., MX
- 1.6 36km NE of Ensenada, B.C., MX
- 1.7 37km E of Ensenada, B.C., MX
- 2.3 36km NE of Ensenada, B.C., MX
- 1.8 36km NE of Ensenada, B.C., MX
- 2.1 42km ENE of Ensenada, B.C., MX
- 2.2 38km 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.