M4.5 earthquake 54 km SW of Tambolaka, East Nusa Tenggara, Indonesia
A magnitude 4.5 earthquake struck 54 km SW of Tambolaka, East Nusa Tenggara, Indonesia at 20:17 local time (12:17 UTC) on 5 Oct 2026, at a depth of 35 km, according to USGS and GFZ.
Reported by 2 agencies · revised from M4.4
Data: USGS, GFZ · updated 2026-10-24 19:14 UTC · reviewed
- Magnitude
- 4.5light
body-wave magnitude (mb)
revised from 4.4 - Depth
- 34.6 km
- Status
- Reviewed
- Origin time
- 2026-10-05 12:17:22 UTC
- Local: 5 Oct 2026, 20:17:22 (Asia/Makassar)
- Epicentre
- 9.704° S, 118.838° E
Circles show this event and others within 30 km from 7 days before to 30 days after. Lines: plate boundaries and GEM active faults. Open on the live map
Nearby places
| Place | Distance | Est. shaking |
|---|---|---|
| TambolakaEast Nusa Tenggara, Indonesia · pop. 35,790 | 54 km | IIIWeak |
| DompuWest Nusa Tenggara, Indonesia · pop. 54,987 | 136 km | IIWeak |
| BimaWest Nusa Tenggara, Indonesia · pop. 165,113 | 139 km | IIWeak |
| MataramWest Nusa Tenggara, Indonesia · pop. 441,147 | 324 km | INot felt |
Shaking is an estimate from the intensity prediction equation of Allen, Wald & Worden (2012), not an observation. Local ground and buildings can change it by a level or more. Likely felt out to about 66 km.
Every agency's solution
Agencies locate earthquakes with their own stations and methods, so their numbers differ. We match reports of the same event by time, distance and magnitude and show them side by side. The headline uses USGS, which has been reviewed by an analyst.
How big was it?
Widely felt near the epicentre: rattling windows and objects. Significant damage is unlikely.
It released roughly the energy of 85 t of TNT. Magnitude is logarithmic: each whole step means about 32 times more energy and 10 times larger waves on a seismogram. Depth matters too: at 35 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.
M4.5 releases about 32× the energy of M3.5, and its waves are about 10× taller on a seismogram. Energy: 85 t of TNT vs 2.7 t of TNT.
Each square is the energy of one M3.5. Energy from log₁₀E = 1.5M + 4.8.
Aftershocks and nearby activity
5 later earthquakes within 30 km; the largest was M4.7 16 days ago. 3 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.
Mainshock M4.5
5 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).
| Time after mainshock (hours) | Magnitude | Depth (km) |
|---|---|---|
| 9.35 | 4.5 | 35 |
| 24.38 | 4.4 | 53 |
| 64.82 | 4.7 | 60 |
| 186.42 | 4.6 | 10 |
| 189.52 | 4.5 | 35 |
- 4.740 km SW of Tambolaka, East Nusa Tenggara, Indonesia10-08 05:06
- 4.667 km WSW of Tambolaka, East Nusa Tenggara, Indonesia10-13 06:42
- 4.536 km SW of Tambolaka, East Nusa Tenggara, Indonesia10-05 21:38
- 4.572 km SW of Tambolaka, East Nusa Tenggara, Indonesia10-13 09:48
- 4.451 km SW of Tambolaka, East Nusa Tenggara, Indonesia10-06 12:40
Did you feel it?
Reports from people help show where shaking was strong. They are anonymous and shown here in aggregate.
Reports close 14 days after an earthquake.
Reports on SeismoAtlas
No reports yet.
Event id us6000tznk. First recorded here 5 Oct 2026, 13:32:33 UTC. Solutions: USGS (usgs:us6000tznk); GFZ (geofon:gfz2026tnar). Cite as: SeismoAtlas, “M4.5 earthquake 54 km SW of Tambolaka, East Nusa Tenggara, Indonesia”, https://seismoatlas.com/earthquake/us6000tznk-m4-5-earthquake-54-km-sw-of-tambolaka-east-nusa-tenggara-indonesia, data from USGS, GFZ.
JSON: /api/v1/events/us6000tznk. SeismoAtlas is not an official warning service.