Earthquake · reviewed by a seismologist
M 4.2mb
51 km ESE of Mud Bay, Alaska
Yes. A magnitude 4.2 earthquake was recorded 51 km ESE of Mud Bay, Alaska, at 3:48 pm AKDT on 10 October 2022 (23:48 UTC), 2.1 km deep. 84 people have reported feeling it to USGS.
- When
- Magnitude
- M 4.2 (mb)
- Depth
- 2.1 km below the surface
- Felt
- 84 reports · strongest reported intensity IV
- Measured shaking
- intensity IV (ShakeMap)
- Tsunami
- USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
- Nearest
- Haines Borough, 61 km W
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1426 days ago
Earthquake alerts for Haines, AK
Get a notification in this browser when USGS records an earthquake near Haines, AK. No account or email needed.
Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.
At this magnitude and depth, people at rest would likely notice it out to about 113 km (70 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.
How big was it?
This earthquake released about 30 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.2 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 5,600× the energy of this one
- Mineral, Virginia 2011 M 5.8 250× the energy of this one
- Magna, Utah 2020 M 5.7 180× the energy of this one
- This earthquake M 4.2 about 30 tons of TNT
- Around the size people start to feel M 3.0 this one released 63× more
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 (31 mi) since our catalogue begins in 2016. No other earthquake of M4 or more has been recorded this close in that time.
Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:
- 5.0 23 km SSE of Mud Bay, Alaska · 43 km WSW 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 59.0499, -134.5066. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Haines Borough, AK | 61 km (38 mi) | W | earthquakes near Haines Borough |
| Skagway Municipality, AK | 74 km (46 mi) | NW | earthquakes near Skagway Municipality |
| Juneau City and Borough, AK | 78 km (48 mi) | SSE | earthquakes near Juneau City and Borough |
| Hoonah-Angoon Census Area, AK | 107 km (67 mi) | SW | earthquakes near Hoonah-Angoon Census Area |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
30 earthquakes have been recorded within 50 km since this one.
- 2.8 60 km N of Juneau, Alaska
- 3.5 26 km E of Mud Bay, Alaska
- 3.0 45 km SE of Mud Bay, Alaska
- 1.8 45 km SE of Mud Bay, Alaska
- 2.4 56 km N of Juneau, Alaska
- 2.6 56 km N of Juneau, Alaska
- 2.3 58 km N of Juneau, Alaska
- 2.8 58 km N of Juneau, Alaska
- 2.3 34 km E of Skagway, Alaska
- 2.0 70 km ESE of Mud Bay, Alaska
- 2.1 64 km ESE of Mud Bay, Alaska
- 1.8 66 km ESE of Mud Bay, Alaska
- 2.1 51 km N of Juneau, Alaska
- 3.3 48 km ESE of Mud Bay, Alaska
- 1.5 40 km ESE of Mud Bay, Alaska
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
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.