Earthquake · reviewed by a seismologist
M 2.8ml
Earthquake near Anza, CA
No earthquake was likely felt in Anza in the 24 hours to 3:36 am PST (11:36 UTC). The last one was M 2.6, 17 km (10 mi) S, at 10:44 pm PST on 5 November 2026, estimated intensity II (weak) in town; 7 felt reports to USGS. Every earthquake near Anza
This page: a magnitude 2.8 earthquake was recorded 9 km (6 mi) west-southwest of Anza, CA, at 11:40 am PDT on 29 July 2018 (18:40 UTC), 3.6 km deep. 8 people have reported feeling it to USGS.
USGS: 9km WSW of Anza, CA
85 km (53 mi) NNE of San Diego, CA · 33 km (21 mi) SE of Hemet, CA
- When
- 11:40 am PDT on 29 July 2018 ()
- Where
- 9 km (6 mi) west-southwest of Anza, CA · earthquakes near Anza
- Magnitude
- M 2.8 (ml)
- Depth
- 3.6 km below the surface
- Felt
- 8 reports · strongest reported intensity II
- Nearest
- San Diego County, 54 km S
- Nearest mapped fault
- San Jacinto fault, 12 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 2956 days ago
Earthquake alerts for Anza, CA
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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 small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 27 km (17 mi) from the epicentre. In Anza, 9 km away, the estimate is intensity III (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: Anza 9 km, intensity III · Aguanga 13 km, intensity III · Idyllwild 25 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 460 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 33,000× the energy of this one
- Magna, Utah 2020 M 5.7 23,000× the energy of this one
- Around the size people start to feel M 3.0 2.1× the energy of this one
- This earthquake M 2.8 about 460 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 4,000 times the energy of this one.
Before 2016, the USGS record lists 10 earthquakes of M5 or more within 50 km; the five largest:
- 6.7 The 1918 San Jacinto, California Earthquake · 34 km NW of this epicentre
- 6.0 16km WSW of Oasis, CA · 49 km ESE of this epicentre
- 5.5 1km ENE of Borrego Springs, CA · 46 km SE of this epicentre
- 5.4 20km NNW of Borrego Springs, CA · 28 km ESE of this epicentre
- 5.3 6km SSE of Hemet, CA · 27 km NW 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 33.5130, -116.7568. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Diego County, CA | 54 km (34 mi) | S | earthquakes near San Diego County |
| Riverside County, CA | 74 km (46 mi) | ENE | earthquakes near Riverside County |
| Orange County, CA | 96 km (60 mi) | W | earthquakes near Orange County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
54 earthquakes have been recorded within 50 km since this one.
- 1.5 8km NE of Aguanga, CA
- 2.9 7km NE of Aguanga, CA
- 1.6 8km ENE of Aguanga, CA
- 1.6 8km ENE of Aguanga, CA
- 2.2 7km ENE of Aguanga, CA
- 2.3 8km NE of Aguanga, CA
- 1.7 8km ENE of Aguanga, CA
- 1.7 8km ENE of Aguanga, CA
- 1.9 8km ENE of Aguanga, CA
- 2.9 7km NE of Aguanga, CA
- 2.1 8km NE of Aguanga, CA
- 1.6 9km ENE of Aguanga, CA
- 1.9 8km NE of Aguanga, CA
- 2.0 8km NE of Aguanga, CA
- 1.7 8km NE of Aguanga, 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.