Earthquake · reviewed by a seismologist
M 1.8ml
8km WNW of Lake Henshaw, CA
- When
- Magnitude
- M 1.8 (ml)
- Depth
- 14 km below the surface
- Felt
- 1 report · strongest reported intensity II
- Nearest
- San Diego County, 28 km SSE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2085 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.
How big was it?
This earthquake released about 13 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
- Magna, Utah 2020 M 5.7 810,000× the energy of this one
- Around the size people start to feel M 3.0 72× the energy of this one
- This earthquake M 1.8 about 13 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 33.2662, -116.8412. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| San Diego County, CA | 28 km (17 mi) | NNW of here | earthquakes near San Diego County |
| Riverside County, CA | 93 km (58 mi) | WSW of here | earthquakes near Riverside County |
| Orange County, CA | 98 km (61 mi) | ESE of here | earthquakes near Orange County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
52 earthquakes have been recorded within 50 km since this one.
- 1.5 16km ESE of Anza, CA
- 1.8 16km ESE of Anza, CA
- 2.2 17km ESE of Julian, CA
- 1.8 14km WNW of Anza, CA
- 1.9 10km SE of Warner Springs, CA
- 1.6 3km SE of Lake Henshaw, CA
- 2.0 4km SE of Lake Henshaw, CA
- 3.1 16km ESE of Julian, CA
- 2.0 8km NE of Aguanga, CA
- 2.5 13km WNW of Anza, CA
- 1.8 8km NE of Aguanga, CA
- 1.9 7km SSW of Idyllwild, CA
- 2.2 9km NE of Aguanga, CA
- 2.0 19km ESE of Julian, CA
- 1.6 9km SW of Idyllwild, 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.
For this area
The largest earthquake within 50 km in our catalogue was M 5.2 on 2016-06-10 — it released about 140,000 times the energy of this one.
From the QuakeIndex catalogue, built from the USGS FDSN event service.
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.