QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

Earthquake near Yorba Linda, CA

No earthquake was likely felt in Yorba Linda in the 24 hours to 1:36 am PST (09:36 UTC). The last one was M 1.8, 5 km (3 mi) ESE, at 9:16 pm PST on 3 November 2026, estimated intensity II (weak) in town. Every earthquake near Yorba Linda

This page: a magnitude 1.7 earthquake was recorded 4 km (2 mi) north of Yorba Linda, CA, at 6:29 pm PDT on 1 October 2019 (01:29 UTC), 15 km deep.

USGS: 4km N of Yorba Linda, CA

6 km (3 mi) NW of Yorba Linda, CA · 56 km (35 mi) E of Los Angeles, CA

6:29 pm PDT, Oct 1, 2019 · · 15 km deep · released about 9.6 lb of TNT

Every earthquake near Yorba Linda Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 28 kmLos Angeles County 51 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
6:29 pm PDT on 1 October 2019 ()
Where
4 km (2 mi) north of Yorba Linda, CA · earthquakes near Yorba Linda
Magnitude
M 1.7 (ml)
Depth
15 km below the surface
Felt
no reports yet
Nearest
Orange County, 28 km S
Nearest mapped fault
Elsinore fault, 1 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 2598 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. In Yorba Linda, 4 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.

Earthquakes near other towns within 30 km: Placentia, Brea, Chino Hills, Rowland Heights, Los Serranos, Fullerton.

How big was it?

This earthquake released about 9.6 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 1,600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
  3. Around the size people start to feel M 3.0 99× the energy of this one
  4. This earthquake M 1.7 about 9.6 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 4.4 on 2018-08-29 — about 12,000 times the energy of this one.

Before 2016, the USGS record lists 17 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.4 The 1933 Long Beach, California Earthquake · 37 km SSW of this epicentre
  2. 6.0 The 1910 Lake Elsinore, California Earthquake · 46 km ESE of this epicentre
  3. 5.9 The 1987 Whittier Narrows, California Earthquake · 29 km WNW of this epicentre
  4. 5.8 The 1991 Sierra Madre, California Earthquake · 42 km NNW of this epicentre
  5. 5.5 The 1990 Upland, California Earthquake · 27 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 33.9232, -117.8155. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Orange County, CA 28 km (17 mi) S earthquakes near Orange County
Los Angeles County, CA 51 km (32 mi) NW earthquakes near Los Angeles County
San Diego County, CA 139 km (86 mi) SE earthquakes near San Diego County

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

Aftershocks so far

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

  1. 1.6 1km SE of Compton, CA
  2. 1.9 2km NNE of Maywood, CA
  3. 2.9 3km ENE of Brea, CA
  4. 3.2 11km ENE of North Tustin, CA
  5. 2.1 3km NE of Brea, CA
  6. 1.5 4km ENE of Brea, CA
  7. 1.6 3km NNW of Bloomington, CA
  8. 3.2 2km ENE of Brea, CA
  9. 1.7 7km NE of Rancho Cucamonga, CA
  10. 2.4 3km E of Upland, CA
  11. 1.5 5 km SE of Home Gardens, CA
  12. 1.8 2km SSW of Devore, CA
  13. 1.9 6km WSW of Norco, CA
  14. 2.6 3km ENE of Brea, CA
  15. 2.2 5km SE of Lytle Creek, 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.