2.1

M2.1 Earthquake 10 km WNW of Longbranch, Washington — September 21, 2023

2023-09-21 23:42:02 UTC (2023-09-21) · approx. 3:42 PM UTC-8 local

MagnitudeM2.1(ml)
Time23:42 UTC≈ 3:42 PM UTC-8
Depth48.8 kmshallow crustal
Coordinates47.235°, -122.890°
Felt byNo felt reports
Status✓ Reviewed by USGS
Map showing earthquake epicenter at 47.23°, -122.89°

Earthquake Details

Magnitude
2.1 ml
Depth
48.8 km
shallow crustal
Location
47.2350°N
-122.8898°E

Technical Information

Event ID
uw61961396
Event Type
earthquake
Status
✓ Reviewed
Significance
69
Stations Used
76
Azimuthal Gap
29.0°
Min Station Distance
0.077°
RMS Residual
0.15 sec
Last Updated
2025-11-16 01:34:46 UTC

Nearby Earthquakes (Last 7 Days)

2.9
18 km ENE of Okanagan Falls, Canada
5 days ago · 10.0 km deep

Actions

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Location

Washington
View all Washington earthquakes

Understanding This Data

Magnitude 2.1 earthquakes are typically only recorded by instruments.

Learn more about magnitude →

Authoritative source: USGS event page (event ID: uw61961396). All scientific values on this page are sourced verbatim from the USGS feed.

Cite this page: EarthquakeTracker.org. (2023, September 21, 2023). M2.1 Earthquake 10 km WNW of Longbranch, Washington — September 21, 2023. Retrieved November 16, 2025 from https://www.earthquaketracker.org/earthquakes/event/uw61961396/