Earthquake · reviewed by a seismologist
M 1.8ml
Earthquake near Aguanga, CA
No earthquake was likely felt in Aguanga in the 24 hours to 11:04 pm PST (07:04 UTC). The last one was M 2.6, 20 km (12 mi) ESE, at 10:44 pm PST on 5 November 2026, estimated intensity II (weak) in town; 7 felt reports to USGS. Every earthquake near Aguanga
This page: a magnitude 1.8 earthquake was recorded 14 km (9 mi) south-southwest of Aguanga, CA, at 7:10 pm PDT on 27 April 2017 (02:10 UTC), 17 km deep.
USGS: 13 km SSW of Aguanga, California
61 km (38 mi) NNE of San Diego, CA · 27 km (17 mi) NE of Escondido, CA
- When
- 7:10 pm PDT on 27 April 2017 ()
- Where
- 14 km (9 mi) south-southwest of Aguanga, CA · earthquakes near Aguanga
- Magnitude
- M 1.8 (ml)
- Depth
- 17 km below the surface
- Felt
- no reports yet
- Nearest
- San Diego County, 35 km SSE
- Nearest mapped fault
- Elsinore fault, 2 km from its surface trace — near is not the same as on
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3467 days ago
Earthquake alerts for Aguanga, CA
Get a notification in this browser when USGS records an earthquake near Aguanga, 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. In Aguanga, 14 km away, the estimate is intensity II (weak). 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: Valley Center, Hidden Meadows, Rainbow, Escondido, Temecula.
How big was it?
This earthquake released about 17 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 5.8 900,000× the energy of this one
- Magna, Utah 2020 M 5.7 640,000× the energy of this one
- Around the size people start to feel M 3.0 57× the energy of this one
- This earthquake M 1.8 about 17 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 since 2016 was M 5.2 on 2016-06-10 — about 110,000 times the energy of this one.
Before 2016, the USGS record lists 7 earthquakes of M5 or more within 50 km; the five largest:
- 6.7 The 1918 San Jacinto, California Earthquake · 49 km N of this epicentre
- 5.4 20km NNW of Borrego Springs, CA · 41 km ENE of this epicentre
- 5.3 6km SSE of Hemet, CA · 43 km N of this epicentre
- 5.3 18km ESE of Anza, CA · 41 km ENE of this epicentre
- 5.2 10km ESE of Anza, CA · 39 km NE of this epicentre
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 33.3227, -116.8997. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Diego County, CA | 35 km (22 mi) | SSE | earthquakes near San Diego County |
| Orange County, CA | 90 km (56 mi) | WNW | earthquakes near Orange County |
| Riverside County, CA | 95 km (59 mi) | ENE | earthquakes near Riverside 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.
- 2.2 20km ESE of Anza, CA
- 1.8 18km ESE of Anza, CA
- 1.8 10km ENE of Pala, CA
- 1.6 10km NNW of Anza, CA
- 1.9 10km NNW of Anza, CA
- 1.6 8km ESE of Valle Vista, CA
- 2.2 8km N of Lake Henshaw, CA
- 2.1 10km NNW of Anza, CA
- 2.7 10km NNW of Anza, CA
- 1.9 10km NNW of Anza, CA
- 2.3 8km NE of Aguanga, CA
- 1.6 8km NE of Aguanga, CA
- 2.0 8km NE of Aguanga, CA
- 1.7 10km NNW of Anza, CA
- 1.5 10km NNW of Anza, 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.
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.