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United States · California

M1.7 Earthquake near Altadena, California (United States)

UTC time: 2026-10-23 00:28:42 UTC Local time: —

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About this earthquake

On October 23, 2026 at 00:28 UTC, a magnitude M1.7 earthquake occurred near Altadena, California (United States). With a focal depth of about 8 km, this was a shallow earthquake, whose shaking is usually felt more strongly at the surface. Events of this size typically go unnoticed.

The data is provided by USGS and cross-checked across seismological networks. United States: 200 earthquakes were recorded in the past 24 hours, the strongest reaching M3.3.

Details

ID
12b07797d125b68c5261e62d4e643d7f492ca739
Magnitude
M1.7
Depth
8.4 km
UTC time
2026-10-23 00:28:42 UTC
Local time
—
Country
United States
State
California
City
Altadena
County
Los Angeles County
Source
usgs
Coordinates
34.20000, -118.06583
Temperature
16.7°C

Depth profile

Depth profile Depth: 8.4 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 8.4 km
Shallow
8.4 km
8.4 km — shallower than the regional average (15.3 km)
Regional average: 15.3 km
Why depth matters

Shallow quakes release energy near the surface — shaking is felt more strongly and damage potential is higher.

Depth classes per USGS

Volcanoes nearby

  • Salton Buttes
    Distance: 253 km ·Lava dome(s) ·Elevation: -40 m ·Last eruption: 210 ·United States
  • Ubehebe Craters
    Distance: 318 km ·Maar(s) ·Elevation: 752 m ·Last eruption: -150 ·United States
  • Mammoth Mountain
    Distance: 391 km ·Lava dome(s) ·Elevation: 3'369 m ·Last eruption: 1260 ·United States
  • Mono-Inyo Craters
    Distance: 410 km ·Lava dome(s) ·Elevation: 2'796 m ·Last eruption: 1380 ·United States
  • Mono Lake Volcanic Field
    Distance: 431 km ·Volcanic field ·Elevation: 2'121 m ·Last eruption: 1790 ·United States
  • Pinacate
    Distance: 499 km ·Volcanic field ·Elevation: 1'183 m ·Mexico

Radius · 50 km

Nearby infrastructure

Up to 3 nearest sites per category

Airports

  • Hollywood Burbank/Bob Hope AirportUnited States · BUR · KBUR
    26.9 kmStraight-line distance
  • Jack Northrop Field Hawthorne Municipal AirportUnited States · HHR · KHHR
    39.6 kmStraight-line distance
  • Los Angeles International AirportUnited States · LAX · KLAX
    42.6 kmStraight-line distance

Source: OurAirports · Dataset date: 2026-10-05

This selection shows geographic proximity, not a hazard zone or confirmed impacts. Distances use recorded site coordinates. Sources & data dates

California

Context for this earthquake

05 Oct 2025 – 05 Oct 2026 · M ≥ 2.0 · 2,447 Catalogue entries

Sufficiently reliable matching data are not currently available for a direct comparison. The area profile shows the available records and their limitations.

Open seismic profile

Historic earthquake map · United States

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Explore recent and long-term earthquake activity in this country. Use filters to narrow down by magnitude, depth, and date range.

Country statistics · United States

Country overview
View earthquake KPIs, strongest and latest events, and averages for this country.

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