QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4ml

Earthquake near Anza, CA

No earthquake was likely felt in Anza in the 24 hours to 10:36 am PST (18:36 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 2.4 earthquake was recorded 13 km (8 mi) west of Anza, CA, at 4:15 am PST on 22 January 2020 (12:15 UTC), 5.3 km deep. 10 people have reported feeling it to USGS.

USGS: 13km W of Anza, CA

89 km (56 mi) NNE of San Diego, CA · 24 km (15 mi) SE of Hemet, CA

4:15 am PST, Jan 22, 2020 · · 5.3 km deep · released about 130 lb of TNT

Every earthquake near Anza Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Diego County 61 kmRiverside County 77 kmOrange County 90 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
4:15 am PST on 22 January 2020 ()
Where
13 km (8 mi) west of Anza, CA · earthquakes near Anza
Magnitude
M 2.4 (ml)
Depth
5.3 km below the surface
Felt
10 reports · strongest reported intensity III
Nearest
San Diego County, 61 km S
Nearest mapped fault
San Jacinto fault, 10 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 2414 days ago

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 21 km (13 mi) from the epicentre. In Anza, 13 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 13 km, intensity II · Aguanga 15 km, intensity II · Idyllwild 21 km, intensity II · Valle Vista 21 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 130 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 110,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 80,000× the energy of this one
  3. Around the size people start to feel M 3.0 7.2× the energy of this one
  4. This earthquake M 2.4 about 130 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 14,000 times the energy of this one.

Before 2016, the USGS record lists 11 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.7 The 1918 San Jacinto, California Earthquake · 25 km NW of this epicentre
  2. 5.4 20km NNW of Borrego Springs, CA · 36 km ESE of this epicentre
  3. 5.3 6km SSE of Hemet, CA · 18 km NW of this epicentre
  4. 5.3 18km ESE of Anza, CA · 31 km ESE of this epicentre
  5. 5.2 12km WSW of Morongo Valley, CA · 49 km NNE 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 33.5738, -116.8160. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
San Diego County, CA 61 km (38 mi) S earthquakes near San Diego County
Riverside County, CA 77 km (48 mi) ENE earthquakes near Riverside County
Orange County, CA 90 km (56 mi) W earthquakes near Orange County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

49 earthquakes have been recorded within 50 km since this one.

  1. 2.5 16km SE of Anza, CA
  2. 1.6 8km SE of Valle Vista, CA
  3. 2.1 13 km WNW of Anza, CA
  4. 1.5 4 km SE of Lake Henshaw, CA
  5. 2.4 3 km SE of Lake Henshaw, CA
  6. 1.6 3 km SE of Lake Henshaw, CA
  7. 1.6 3km SE of Lake Henshaw, CA
  8. 2.1 7km E of Cabazon, CA
  9. 1.5 2km SSE of Garnet, CA
  10. 1.6 3 km SE of Lake Henshaw, CA
  11. 1.8 16km ESE of Anza, CA
  12. 1.7 18 km ESE of Anza, CA
  13. 1.5 18 km ESE of Anza, CA
  14. 1.9 8km NE of Aguanga, CA
  15. 1.6 23km ESE 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

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.