Earthquakes / EVENT RECORD
M 4.8 - 127 km S of False Pass, Alaska
USGS · Every measurement below belongs to the selected record.
Around the epicentre
Regional view · markers are locations, not affected areas
Magnitude
M 4.8
Scale: mb
Depth
35 km
operator assigned
Reported by people
Not published
Number of felt reports
USGS review
reviewed
Review does not imply final measurements
What the record tells us
USGS reports a magnitude 4.8 earthquake in 127 km S of False Pass, Alaska, at a depth of 35 km.
Detailed source data captured 2026-10-01 16:59:05 UTC.
Measurements & confidence
- Event time (UTC)
- 2026-10-01 14:46:19.877 UTC
- Source updated (UTC)
- 2026-10-01 15:50:33.786 UTC
- Location
- 53.723°, -163.724°
- Stations used for location
- 68
- Horizontal error
- 5.87 km
- Depth error
- 1.931 km
- Magnitude error
- 0.058
Errors are the source’s reported uncertainty estimates, not guaranteed bounds. A depth marked “operator assigned” was fixed during analysis.
Shaking & impact
- Instrumental intensity
- 2.745 MMI
- Felt-report intensity
- Not published
- PAGER impact alert
- Not published
No published assessment does not mean no shaking or no impact. A magnitude value alone cannot establish damage or a tsunami warning.
Nearby seismic activity
Within 500 km · M2.5+ · seven days before the event through the latest query, up to seven days after
09-24
0
09-25
1
09-26
2
09-27
1
09-28
6
09-29
1
09-30
0
10-01
0
Query window: 2026-09-24 14:46:19 to 2026-10-01 16:59:05 UTC. This is spatial proximity, not an identified aftershock sequence.
Magnitude
M 4.8
Scale: mb
Depth
35 km
operator assigned
Reported by people
Not published
Number of felt reports
USGS review
reviewed
Review does not imply final measurements
What the record tells us
USGS reports a magnitude 4.8 earthquake in 127 km S of False Pass, Alaska, at a depth of 35 km.
Detailed source data captured 2026-10-01 16:59:05 UTC.
Measurements & confidence
- Event time (UTC)
- 2026-10-01 14:46:19.877 UTC
- Source updated (UTC)
- 2026-10-01 15:50:33.786 UTC
- Location
- 53.723°, -163.724°
- Stations used for location
- 68
- Horizontal error
- 5.87 km
- Depth error
- 1.931 km
- Magnitude error
- 0.058
Errors are the source’s reported uncertainty estimates, not guaranteed bounds. A depth marked “operator assigned” was fixed during analysis.
Shaking & impact
- Instrumental intensity
- 2.745 MMI
- Felt-report intensity
- Not published
- PAGER impact alert
- Not published
No published assessment does not mean no shaking or no impact. A magnitude value alone cannot establish damage or a tsunami warning.
Nearby seismic activity
Within 500 km · M2.5+ · seven days before the event through the latest query, up to seven days after
09-24
0
09-25
1
09-26
2
09-27
1
09-28
6
09-29
1
09-30
0
10-01
0
Query window: 2026-09-24 14:46:19 to 2026-10-01 16:59:05 UTC. This is spatial proximity, not an identified aftershock sequence.
The record as it develops
This timeline begins when our journal started capturing details. It is not a complete USGS revision history.
Captured 2026-10-01 15:14:06 UTC
First detailed capture · M4.8 · 35 km deep · 11 nearby records
Source updated 2026-10-01 15:09:04 UTC
Captured 2026-10-01 15:59:03 UTC
Updated capture · M4.8 · 35 km deep · 11 nearby records
Source updated 2026-10-01 15:50:33 UTC
Captured 2026-10-01 16:59:05 UTC
Updated capture · M4.8 · 35 km deep · 11 nearby records
Source updated 2026-10-01 15:50:33 UTC
Magnitude is not shaking
Magnitude describes the earthquake’s size. The shaking experienced at a place depends on distance, depth, local ground conditions and the rupture.
Depth needs context
A reported depth describes the location of the earthquake underground. Some solutions use an assigned depth; uncertainty and review status matter.
Nearby does not mean aftershock
Our regional search finds events by distance and time. Establishing an aftershock sequence requires seismological assessment.
This is a source-linked archive. Source measurements and assessments can change. An archived bulletin is not evidence that a warning is currently active.
In the daily journal
1 October 2026 ↗SOURCE ID usgs:us6000tyuf