Earthquake · reviewed by a seismologist
M 1.7ml
Earthquake near Aguanga, CA
No earthquake was likely felt in Aguanga in the 24 hours to 9:29 am PST (17:29 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 1.7 earthquake was recorded 8 km (5 mi) northeast of Aguanga, CA, at 8:37 pm PST on 21 December 2019 (04:37 UTC), 8.2 km deep.
USGS: 8km NE of Aguanga, CA
80 km (50 mi) NNE of San Diego, CA · 31 km (19 mi) E of Temecula, CA
- When
- 8:37 pm PST on 21 December 2019 ()
- Where
- 8 km (5 mi) northeast of Aguanga, CA · earthquakes near Aguanga
- Magnitude
- M 1.7 (ml)
- Depth
- 8.2 km below the surface
- Felt
- no reports yet
- Nearest
- San Diego County, 51 km S
- Nearest mapped fault
- Elsinore fault, 14 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 2516 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, people at rest would likely notice it out to about 9 km (6 mi) from the epicentre. In Aguanga, 8 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.
Likely felt in: Aguanga 8 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
- Magna, Utah 2020 M 5.7 970,000× the energy of this one
- Around the size people start to feel M 3.0 86× the energy of this one
- This earthquake M 1.7 about 11 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 170,000 times the energy of this one.
Before 2016, the USGS record lists 9 earthquakes of M5 or more within 50 km; the five largest:
- 6.7 The 1918 San Jacinto, California Earthquake · 35 km NNW of this epicentre
- 5.5 1km ENE of Borrego Springs, CA · 47 km ESE of this epicentre
- 5.4 20km NNW of Borrego Springs, CA · 31 km ESE of this epicentre
- 5.3 6km SSE of Hemet, CA · 28 km NNW of this epicentre
- 5.3 18km ESE of Anza, CA · 28 km E 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 33.4807, -116.7975. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Diego County, CA | 51 km (32 mi) | S | earthquakes near San Diego County |
| Riverside County, CA | 79 km (49 mi) | ENE | earthquakes near Riverside County |
| Orange County, CA | 93 km (58 mi) | WNW | earthquakes near Orange County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
56 earthquakes have been recorded within 50 km since this one.
- 2.0 3 km ESE of Lake Henshaw, CA
- 2.4 13km WNW of Anza, CA
- 1.6 13km W of Anza, CA
- 2.0 13km WNW of Anza, CA
- 1.7 13km WNW of Anza, CA
- 3.6 14km W of Anza, CA
- 1.6 8km N of Borrego Springs, CA
- 2.1 3km SSW of Palomar Observatory, CA
- 1.7 15km SE of Anza, CA
- 2.1 8 km NE of Aguanga, CA
- 1.7 8km NE of Aguanga, CA
- 1.6 6 km NW of Anza, CA
- 1.5 10 km NE of Aguanga, CA
- 1.5 19km ESE of Anza, CA
- 1.6 5km N of Murrieta, 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.