QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7ml

Earthquake near Monterey Park, CA

No earthquake was likely felt in Monterey Park in the 24 hours to 4:26 am PST (12:26 UTC). The last one was M 3.2, 31 km (19 mi) S, at 12:44 am PDT on 9 October 2026, estimated intensity II (weak) in town; 1,090 felt reports to USGS. Every earthquake near Monterey Park

This page: a magnitude 2.7 earthquake was recorded in Monterey Park, CA, at 8:35 am PDT on 11 October 2023 (15:35 UTC), 10 km deep. 237 people have reported feeling it to USGS.

USGS: 2 km ENE of Monterey Park, CA

29 km (18 mi) ENE of Los Angeles, CA · in Alhambra, CA

8:35 am PDT, Oct 11, 2023 · · 10 km deep · released about 350 lb of TNT

Every earthquake near Monterey Park Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Los Angeles County 20 kmOrange County 53 kmVentura County 100 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
8:35 am PDT on 11 October 2023 ()
Where
in Monterey Park, CA · earthquakes near Monterey Park
Magnitude
M 2.7 (ml)
Depth
10 km below the surface
Felt
237 reports · strongest reported intensity IV
Nearest
Los Angeles County, 20 km NW
Nearest mapped fault
Raymond 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 925 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 23 km (14 mi) from the epicentre. 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: Monterey Park in town, intensity III · San Gabriel 3 km, intensity III · Rosemead 3 km, intensity III · Alhambra 3 km, intensity III · South El Monte 6 km, intensity III · Temple City 6 km, intensity III · South Pasadena 6 km, intensity III · Montebello 7 km, intensity III. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 350 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 43,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 31,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.7× the energy of this one
  4. This earthquake M 2.7 about 350 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 2020-09-19 — about 560 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 Northridge, California, earthquake · 43 km WNW of this epicentre
  2. 6.6 1971 San Fernando Earthquake, California · 45 km NNW of this epicentre
  3. 5.9 The 1987 Whittier Narrows, California Earthquake · 3 km ESE of this epicentre
  4. 5.9 1km ENE of Granada Hills, California · 42 km WNW of this epicentre
  5. 5.8 10km SSW of Agua Dulce, CA · 45 km NNW 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 34.0720, -118.1052. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Los Angeles County, CA 20 km (12 mi) NW earthquakes near Los Angeles County
Orange County, CA 53 km (33 mi) SE earthquakes near Orange County
Ventura County, CA 100 km (62 mi) WNW earthquakes near Ventura 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. 1.6 13 km SSE of Las Flores, CA
  2. 1.6 3 km ENE of View Park-Windsor Hills, CA
  3. 1.9 4 km ESE of Placentia, CA
  4. 1.6 2 km NE of Yorba Linda, CA
  5. 2.0 3 km SE of Ontario, CA
  6. 1.5 9 km N of Rancho Cucamonga, CA
  7. 1.9 10 km ENE of Villa Park, CA
  8. 1.9 2 km ENE of El Segundo, CA
  9. 2.2 2 km N of Huntington Park, CA
  10. 2.5 3 km N of Huntington Park, CA
  11. 2.0 3 km SE of Marina del Rey, CA
  12. 3.6 3 km ESE of Ontario, CA
  13. 1.7 4 km NW of Sylmar, CA
  14. 1.8 2 km ENE of Carson, CA
  15. 1.6 2 km NW of Tarzana, 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.