QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

Earthquake near Bradbury, CA

No earthquake was likely felt in Bradbury in the 24 hours to 2:32 am PST (10:32 UTC). The last one was M 3.8, 78 km (48 mi) WNW, at 8:00 pm PDT on 29 September 2026, estimated intensity II (weak) in town; 199 felt reports to USGS. Every earthquake near Bradbury

This page: a magnitude 1.6 earthquake was recorded 2 km (1 mi) north of Bradbury, CA, at 7:15 pm PDT on 19 October 2016 (02:15 UTC), 2.4 km deep.

USGS: 2km N of Bradbury, CA

7 km (4 mi) NE of Arcadia, CA · 43 km (27 mi) ENE of Los Angeles, CA

7:15 pm PDT, Oct 19, 2016 · · 2.4 km deep · released about 7.3 lb of TNT

Every earthquake near Bradbury Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Los Angeles County 27 kmOrange County 58 kmVentura County 109 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
7:15 pm PDT on 19 October 2016 ()
Where
2 km (1 mi) north of Bradbury, CA · earthquakes near Bradbury
Magnitude
M 1.6 (ml)
Depth
2.4 km below the surface
Felt
no reports yet
Nearest
Los Angeles County, 27 km W
Nearest mapped fault
Sierra Madre 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 3675 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 Bradbury, 2 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: Monrovia 3 km, intensity II · Arcadia 6 km, intensity II · Sierra Madre 7 km, intensity II · Azusa 7 km, intensity II · Baldwin Park 9 km, intensity II · Temple City 10 km, intensity II · Glendora 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 7.3 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 2,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,500,000× the energy of this one
  3. Around the size people start to feel M 3.0 130× the energy of this one
  4. This earthquake M 1.6 about 7.3 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

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

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

  1. 6.6 1971 San Fernando Earthquake, California · 46 km NW of this epicentre
  2. 5.9 The 1987 Whittier Narrows, California Earthquake · 15 km SW of this epicentre
  3. 5.9 1km ENE of Granada Hills, California · 49 km WNW of this epicentre
  4. 5.8 10km SSW of Agua Dulce, CA · 46 km NW of this epicentre
  5. 5.8 10km SSW of Agua Dulce, CA · 46 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 34.1668, -117.9748. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Los Angeles County, CA 27 km (17 mi) W earthquakes near Los Angeles County
Orange County, CA 58 km (36 mi) SSE earthquakes near Orange County
Ventura County, CA 109 km (67 mi) WNW earthquakes near Ventura County

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

Aftershocks so far

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

  1. 2.5 6km NNE of Lytle Creek, CA
  2. 1.9 1km SE of Fontana, CA
  3. 1.6 3km WSW of Compton, CA
  4. 1.6 1km ESE of Hawthorne, CA
  5. 1.9 1km SSE of View Park-Windsor Hills, CA
  6. 1.6 7km WSW of Wrightwood, CA
  7. 1.5 14km N of La Verne, CA
  8. 2.7 1km E of Brea, CA
  9. 1.9 1km ENE of Brea, CA
  10. 2.2 5km ESE of Rancho Cucamonga, CA
  11. 1.9 7km S of Pearblossum, CA
  12. 1.8 6km S of Phelan, CA
  13. 1.8 4km ESE of Marina del Rey, CA
  14. 1.6 4km NNE of Fontana, CA
  15. 1.7 4km NW of Lake View Terrace, 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.