QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

Earthquake near San Jacinto, CA

No earthquake was likely felt in San Jacinto in the 24 hours to 8:18 am PST (16:18 UTC). The last one was M 2.2, 3 km (2 mi) N, at 8:52 pm PDT on 14 October 2026, estimated intensity II (weak) in town; 3 felt reports to USGS. Every earthquake near San Jacinto

This page: a magnitude 1.7 earthquake was recorded in San Jacinto, CA, at 12:04 pm PDT on 19 July 2020 (19:04 UTC), 15 km deep.

USGS: 0km ESE of San Jacinto, CA

in San Jacinto, CA · 137 km (85 mi) E of Los Angeles, CA

12:04 pm PDT, Jul 19, 2020 · · 15 km deep · released about 11 lb of TNT

Every earthquake near San Jacinto Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 77 kmSan Diego County 86 kmRiverside County 88 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
12:04 pm PDT on 19 July 2020 ()
Where
in San Jacinto, CA · earthquakes near San Jacinto
Magnitude
M 1.7 (ml)
Depth
15 km below the surface
Felt
no reports yet
Nearest
Orange County, 77 km W
Nearest mapped fault
San Jacinto fault, 6 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 2306 days ago

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. 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: Hemet, East Hemet, Valle Vista, Green Acres, Winchester, Homeland.

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.

  1. Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 89× the energy of this one
  4. 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 4.5 on 2018-05-08 — about 15,000 times the energy of this one.

Before 2016, the USGS record lists 19 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.7 The 1918 San Jacinto, California Earthquake · 3 km SW of this epicentre
  2. 6.3 The 1992 Big Bear, California Earthquake · 48 km NNE of this epicentre
  3. 6.2 3 km SE of San Bernardino, California · 44 km NW of this epicentre
  4. 6.0 The 1910 Lake Elsinore, California Earthquake · 42 km WSW of this epicentre
  5. 6.0 The 1986 North Palm Springs, California Earthquake · 40 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 33.7823, -116.9545. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Orange County, CA 77 km (48 mi) W earthquakes near Orange County
San Diego County, CA 86 km (53 mi) S earthquakes near San Diego County
Riverside County, CA 88 km (55 mi) E earthquakes near Riverside County
San Bernardino County, CA 139 km (86 mi) NNE earthquakes near San Bernardino County

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

Aftershocks so far

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

  1. 1.6 7km NE of Aguanga, CA
  2. 2.4 16km WNW of Anza, CA
  3. 1.7 4km ENE of Calimesa, CA
  4. 2.1 18km SSE of Big Bear Lake, CA
  5. 1.5 8km NE of Aguanga, CA
  6. 1.9 8km ENE of Aguanga, CA
  7. 1.9 18km SSE of Big Bear Lake, CA
  8. 1.5 18km SSE of Big Bear Lake, CA
  9. 3.1 18km SSE of Big Bear Lake, CA
  10. 1.5 5km SSW of Redlands, CA
  11. 1.5 5km NNE of Moreno Valley, CA
  12. 1.7 2km NNE of Beaumont, CA
  13. 1.7 5km SSE of Home Gardens, CA
  14. 1.9 2km SW of Garnet, CA
  15. 1.8 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

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