QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

Earthquake near Fontana, CA

No earthquake was likely felt in Fontana in the 24 hours to 6:54 pm PST (02:54 UTC). The last one was M 1.6, 5 km (3 mi) W, at 6:17 am PDT on 26 October 2026, estimated intensity II (weak) in town. Every earthquake near Fontana

This page: a magnitude 1.6 earthquake was recorded 11 km (7 mi) southwest of Fontana, CA, at 9:37 am PDT on 15 April 2019 (16:37 UTC), 2.9 km deep. 1 person has reported feeling it to USGS.

USGS: 4km NNW of Mira Loma, CA

7 km (4 mi) WNW of Jurupa Valley, CA · 81 km (50 mi) E of Los Angeles, CA

9:37 am PDT, Apr 15, 2019 · · 2.9 km deep · released about 8.1 lb of TNT

Every earthquake near Fontana Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 46 kmLos Angeles County 70 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
9:37 am PDT on 15 April 2019 ()
Where
11 km (7 mi) southwest of Fontana, CA · earthquakes near Fontana
Magnitude
M 1.6 (ml)
Depth
2.9 km below the surface
Felt
1 report · strongest reported intensity IV
Nearest
Orange County, 46 km SSW
Nearest mapped fault
Red Hill-Etiwanda Avenue fault, 11 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 2759 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 11 km (7 mi) from the epicentre. In Fontana, 11 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: Pedley 8 km, intensity II · Eastvale 8 km, intensity II · Rancho Cucamonga 10 km, intensity II · Norco 11 km, intensity II · Fontana 11 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 8.1 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,300,000× the energy of this one
  3. Around the size people start to feel M 3.0 120× the energy of this one
  4. This earthquake M 1.6 about 8.1 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 14,000 times the energy of this one.

Before 2016, the USGS record lists 10 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.2 3 km SE of San Bernardino, California · 26 km ENE of this epicentre
  2. 6.0 The 1910 Lake Elsinore, California Earthquake · 39 km SSE of this epicentre
  3. 5.5 The 1990 Upland, California Earthquake · 20 km NW of this epicentre
  4. 5.4 5km S of Chino Hills, CA · 23 km WSW of this epicentre
  5. 5.3 Near San Bernardino, California · 44 km ENE 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 34.0302, -117.5308. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Orange County, CA 46 km (28 mi) SSW earthquakes near Orange County
Los Angeles County, CA 70 km (43 mi) WNW earthquakes near Los Angeles County
San Diego County, CA 132 km (82 mi) SSE earthquakes near San Diego County

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

Aftershocks so far

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

  1. 1.7 5km NNW of Glen Avon, CA
  2. 1.6 5km NNW of Glen Avon, CA
  3. 1.6 5km NNW of Glen Avon, CA
  4. 2.0 5km NNW of Glen Avon, CA
  5. 1.7 4km NNW of Glen Avon, CA
  6. 1.9 5km NNW of Glen Avon, CA
  7. 1.9 4km NNW of Glen Avon, CA
  8. 1.8 4km NW of Glen Avon, CA
  9. 2.5 4km NNW of Glen Avon, CA
  10. 2.7 4km NNW of Glen Avon, CA
  11. 2.0 4km NNW of Glen Avon, CA
  12. 1.6 2km ESE of Home Gardens, CA
  13. 2.5 4km NNW of Glen Avon, CA
  14. 1.6 4km NW of Glen Avon, CA
  15. 1.6 4km NNW of Glen Avon, 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.