Earthquakes / EVENT RECORD
M 4.5 - 79 km W of San Antonio de los Cobres, Argentina
USGS · Every measurement below belongs to the selected record.
Read the source-series history ↗Around the epicentre
Regional view · markers are locations, not affected areas
Magnitude
M 4.5
Scale: mb
Depth
170.26 km
from location
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 4.5 earthquake in 79 km W of San Antonio de los Cobres, Argentina, at a depth of 170.26 km.
Detailed source data captured 2026-10-20 15:40:15 UTC.
Measurements & confidence
- Event time (UTC)
- 2026-10-19 07:33:35.444 UTC
- Source updated (UTC)
- 2026-10-20 07:26:24.040 UTC
- Location
- -24.263°, -67.100°
- Stations used for location
- 64
- Horizontal error
- 8.83 km
- Depth error
- 7.065 km
- Magnitude error
- 0.074
Errors are the source’s reported uncertainty estimates, not guaranteed bounds. A depth marked “operator assigned” was fixed during analysis.
Shaking & impact
- Instrumental intensity
- Not published
- 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
10-12
0
10-13
2
10-14
0
10-15
0
10-16
1
10-17
1
10-18
0
10-19
0
10-20
0
Query window: 2026-10-12 07:33:35 to 2026-10-20 15:40:15 UTC. This is spatial proximity, not an identified aftershock sequence.
Magnitude
M 4.5
Scale: mb
Depth
170.26 km
from location
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 4.5 earthquake in 79 km W of San Antonio de los Cobres, Argentina, at a depth of 170.26 km.
Detailed source data captured 2026-10-20 15:40:15 UTC.
Measurements & confidence
- Event time (UTC)
- 2026-10-19 07:33:35.444 UTC
- Source updated (UTC)
- 2026-10-20 07:26:24.040 UTC
- Location
- -24.263°, -67.100°
- Stations used for location
- 64
- Horizontal error
- 8.83 km
- Depth error
- 7.065 km
- Magnitude error
- 0.074
Errors are the source’s reported uncertainty estimates, not guaranteed bounds. A depth marked “operator assigned” was fixed during analysis.
Shaking & impact
- Instrumental intensity
- Not published
- 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
10-12
0
10-13
2
10-14
0
10-15
0
10-16
1
10-17
1
10-18
0
10-19
0
10-20
0
Query window: 2026-10-12 07:33:35 to 2026-10-20 15:40:15 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 2026-10-20 07:32:08 UTC
First detailed capture · M4.5 · 170.26 km deep · 4 nearby records
Source updated 2026-10-20 07:26:24 UTC
Captured 2026-10-20 08:47:08 UTC
Updated capture · M4.5 · 170.26 km deep · 4 nearby records
Source updated 2026-10-20 07:26:24 UTC
Captured 2026-10-20 09:47:11 UTC
Updated capture · M4.5 · 170.26 km deep · 4 nearby records
Source updated 2026-10-20 07:26:24 UTC
Captured 2026-10-20 11:02:13 UTC
Updated capture · M4.5 · 170.26 km deep · 4 nearby records
Source updated 2026-10-20 07:26:24 UTC
Captured 2026-10-20 13:19:11 UTC
Updated capture · M4.5 · 170.26 km deep · 4 nearby records
Source updated 2026-10-20 07:26:24 UTC
Captured 2026-10-20 14:34:11 UTC
Updated capture · M4.5 · 170.26 km deep · 4 nearby records
Source updated 2026-10-20 07:26:24 UTC
Captured 2026-10-20 15:40:15 UTC
Updated capture · M4.5 · 170.26 km deep · 4 nearby records
Source updated 2026-10-20 07:26:24 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
20 October 2026 ↗SOURCE ID usgs:us6000u3b9