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United States · Washington

M0.4 Earthquake near Mason County, Washington (United States)

UTC time: 2026-09-22 22:19:04 UTC Local time: —

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About this earthquake

On September 22, 2026 at 22:19 UTC, a magnitude M0.4 earthquake occurred near Mason County, Washington (United States). With a focal depth of about 18 km, this was a shallow earthquake, whose shaking is usually felt more strongly at the surface. Events of this size typically go unnoticed.

The event was recorded by USGS. United States: 168 earthquakes were recorded in the past 24 hours, the strongest reaching M3.5.

Details

ID
3ab2344456aedaf8097078cc18190e97d743fa52
Magnitude
M0.4
Depth
18.5 km
UTC time
2026-09-22 22:19:04 UTC
Local time
—
Country
United States
State
Washington
City
Mason County
County
Mason County
Source
usgs
Coordinates
47.46617, -123.01667
Temperature
19.9°C

Depth profile

Depth profile Depth: 18.5 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 18.5 km
Shallow
18.5 km
18.5 km — deeper than the regional average (15.2 km)
Regional average: 15.2 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

  • Rainier
    Distance: 117 km ·Stratovolcano ·Elevation: 4'392 m ·Last eruption: 1450 ·United States
  • St. Helens
    Distance: 155 km ·Stratovolcano ·Elevation: 2'549 m ·Last eruption: 2008 ·United States
  • Glacier Peak
    Distance: 159 km ·Stratovolcano ·Elevation: 3'213 m ·Last eruption: 1700 ·United States
  • Baker
    Distance: 171 km ·Stratovolcano(es) ·Elevation: 3'285 m ·Last eruption: 1880 ·United States
  • Adams
    Distance: 182 km ·Stratovolcano ·Elevation: 3'742 m ·Last eruption: 950 ·United States
  • West Crater
    Distance: 190 km ·Volcanic field ·Elevation: 1'329 m ·Last eruption: -5750 ·United States

Radius · 50 km

Nearby infrastructure

Up to 3 nearest sites per category

Airports

  • Tacoma Narrows AirportUnited States · TIW · KTIW
    39.8 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

Washington

Context for this earthquake

05 Oct 2025 – 05 Oct 2026 · M ≥ 2.0 · 89 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

Open history map
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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