Earthquake · reviewed by a seismologist
M 1.9ml
Earthquake near Anza, CA
No earthquake was likely felt in Anza in the 24 hours to 4:15 am PST (12:15 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 1.9 earthquake was recorded 3 km (2 mi) southwest of Anza, CA, at 3:29 pm PDT on 31 July 2016 (22:29 UTC), 4.2 km deep.
USGS: 3km SW of Anza, CA
90 km (56 mi) NNE of San Diego, CA · 35 km (22 mi) SE of Hemet, CA
- When
- 3:29 pm PDT on 31 July 2016 ()
- Where
- 3 km (2 mi) southwest of Anza, CA · earthquakes near Anza
- Magnitude
- M 1.9 (ml)
- Depth
- 4.2 km below the surface
- Felt
- no reports yet
- Nearest
- San Diego County, 57 km S
- Nearest mapped fault
- San Jacinto fault, 7 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 3755 days ago
Earthquake alerts for Anza, CA
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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 14 km (9 mi) from the epicentre. In Anza, 3 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: Anza 3 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 22 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 680,000× the energy of this one
- Magna, Utah 2020 M 5.7 480,000× the energy of this one
- Around the size people start to feel M 3.0 43× the energy of this one
- This earthquake M 1.9 about 22 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 83,000 times the energy of this one.
Before 2016, the USGS record lists 11 earthquakes of M5 or more within 50 km; the five largest:
- 6.7 The 1918 San Jacinto, California Earthquake · 36 km NW of this epicentre
- 6.0 16km WSW of Oasis, CA · 44 km ESE of this epicentre
- 5.5 1km ENE of Borrego Springs, CA · 44 km SE of this epicentre
- 5.4 20km NNW of Borrego Springs, CA · 25 km ESE of this epicentre
- 5.3 6km SSE of Hemet, CA · 29 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 33.5337, -116.6992. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Diego County, CA | 57 km (36 mi) | S | earthquakes near San Diego County |
| Riverside County, CA | 68 km (42 mi) | ENE | earthquakes near Riverside County |
| Orange County, CA | 101 km (63 mi) | W | earthquakes near Orange County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
55 earthquakes have been recorded within 50 km since this one.
- 2.5 7km SE of Valle Vista, CA
- 1.8 3km ENE of Banning, CA
- 2.2 5km NW of Cabazon, CA
- 1.7 3km WSW of Borrego Springs, CA
- 1.7 7km S of Idyllwild, CA
- 1.7 8km NW of Aguanga, CA
- 1.8 3km SSW of Palomar Observatory, CA
- 1.8 3km WSW of Borrego Springs, CA
- 2.0 11km ENE of Aguanga, CA
- 2.2 17km NE of Borrego Springs, CA
- 2.5 11km N of Borrego Springs, CA
- 1.9 9km NW of San Jacinto, CA
- 1.8 8km E of Borrego Springs, CA
- 2.3 10km NNW of Aguanga, CA
- 1.6 12km N of Borrego Springs, 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.