Earthquakes / EVENT RECORD
M 5.9 - 39 km WSW of Tambolaka, Indonesia
USGS · Every measurement below belongs to the selected record.
Around the epicentre
Regional view · markers are locations, not affected areas
Magnitude
M 5.9
Scale: mww
Depth
45.951 km
from location
Reported by people
4
Number of felt reports
USGS review
reviewed
Review does not imply final measurements
What the record tells us
USGS reports a magnitude 5.9 earthquake in 39 km WSW of Tambolaka, Indonesia, at a depth of 45.951 km.
Detailed source data captured 2026-10-04 01:14:05 UTC.
Measurements & confidence
- Event time (UTC)
- 2026-10-03 22:55:55.358 UTC
- Source updated (UTC)
- 2026-10-04 01:01:38.915 UTC
- Location
- -9.567°, 118.908°
- Stations used for location
- 82
- Horizontal error
- 9.53 km
- Depth error
- 6.808 km
- Magnitude error
- 0.062
Errors are the source’s reported uncertainty estimates, not guaranteed bounds. A depth marked “operator assigned” was fixed during analysis.
Shaking & impact
- Instrumental intensity
- 5.147 MMI
- Felt-report intensity
- 4.5 CDI
- PAGER impact alert
- green
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
09-26
0
09-27
0
09-28
0
09-29
0
09-30
0
10-01
2
10-02
1
10-03
0
10-04
0
Query window: 2026-09-26 22:55:55 to 2026-10-04 01:14:05 UTC. This is spatial proximity, not an identified aftershock sequence.
Magnitude
M 5.9
Scale: mww
Depth
45.951 km
from location
Reported by people
4
Number of felt reports
USGS review
reviewed
Review does not imply final measurements
What the record tells us
USGS reports a magnitude 5.9 earthquake in 39 km WSW of Tambolaka, Indonesia, at a depth of 45.951 km.
Detailed source data captured 2026-10-04 01:14:05 UTC.
Measurements & confidence
- Event time (UTC)
- 2026-10-03 22:55:55.358 UTC
- Source updated (UTC)
- 2026-10-04 01:01:38.915 UTC
- Location
- -9.567°, 118.908°
- Stations used for location
- 82
- Horizontal error
- 9.53 km
- Depth error
- 6.808 km
- Magnitude error
- 0.062
Errors are the source’s reported uncertainty estimates, not guaranteed bounds. A depth marked “operator assigned” was fixed during analysis.
Shaking & impact
- Instrumental intensity
- 5.147 MMI
- Felt-report intensity
- 4.5 CDI
- PAGER impact alert
- green
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
09-26
0
09-27
0
09-28
0
09-29
0
09-30
0
10-01
2
10-02
1
10-03
0
10-04
0
Query window: 2026-09-26 22:55:55 to 2026-10-04 01:14:05 UTC. This is spatial proximity, not an identified aftershock sequence.
Magnitude
M 5.9
Scale: mww
Depth
45.951 km
from location
Reported by people
4
Number of felt reports
USGS review
reviewed
Review does not imply final measurements
What the record tells us
USGS reports a magnitude 5.9 earthquake in 39 km WSW of Tambolaka, Indonesia, at a depth of 45.951 km.
Detailed source data captured 2026-10-04 01:14:05 UTC.
Measurements & confidence
- Event time (UTC)
- 2026-10-03 22:55:55.358 UTC
- Source updated (UTC)
- 2026-10-04 01:01:38.915 UTC
- Location
- -9.567°, 118.908°
- Stations used for location
- 82
- Horizontal error
- 9.53 km
- Depth error
- 6.808 km
- Magnitude error
- 0.062
Errors are the source’s reported uncertainty estimates, not guaranteed bounds. A depth marked “operator assigned” was fixed during analysis.
Shaking & impact
- Instrumental intensity
- 5.147 MMI
- Felt-report intensity
- 4.5 CDI
- PAGER impact alert
- green
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
09-26
0
09-27
0
09-28
0
09-29
0
09-30
0
10-01
2
10-02
1
10-03
0
10-04
0
Query window: 2026-09-26 22:55:55 to 2026-10-04 01:14:05 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 2026-10-03 23:29:04 UTC
First detailed capture · M5.9 · 45.951 km deep · 3 nearby records
Source updated 2026-10-03 23:25:56 UTC
Captured 2026-10-03 23:44:04 UTC
Updated capture · M5.9 · 45.951 km deep · 3 nearby records
Source updated 2026-10-03 23:40:39 UTC
Captured 2026-10-03 23:59:03 UTC
Updated capture · M5.9 · 45.951 km deep · 3 nearby records
Source updated 2026-10-03 23:44:11 UTC
Captured 2026-10-04 00:59:03 UTC
Updated capture · M5.9 · 45.951 km deep · 3 nearby records
Source updated 2026-10-03 23:44:11 UTC
Captured 2026-10-04 01:14:05 UTC
Updated capture · M5.9 · 45.951 km deep · 3 nearby records
Source updated 2026-10-04 01:01:38 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
4 October 2026 ↗3 October 2026 ↗SOURCE ID usgs:us6000tzer