The map shows quakes of M1.5 and up from the last 90 days, the 8 biggest on record, and always the very latest quake — even if it was smaller than M1.5. The list below can include smaller ones the map leaves out. Tap any dot for details.
In the last 30 days, 0 earthquakes of M1.5 or bigger were recorded within 100 km of Arco. The biggest quake on record near Arco — records go back to 1980 — was the M6.9 of Oct 28, 1983, 14:06 UTC: The 1983 Borah Peak Earthquake, Idaho.
Latest earthquakes near Arco
| Mag | Location | Local time | Depth | Distance |
|---|---|---|---|---|
| M1.7 | 25 km SSE of Challis, Idaho | Aug 26, 2026, 05:11 PM | 9 km | 96 km NW |
| M2.2 | 27 km ENE of Bellevue, Idaho | Apr 23, 2026, 02:43 AM | 8 km | 53 km W |
| M2.4 | 26 km ENE of Bellevue, Idaho | Apr 22, 2026, 11:40 PM | 5 km | 54 km W |
| M2.4 | 29 km S of Clayton, Idaho | Apr 13, 2026, 04:16 AM | 5 km | 93 km WNW |
| M1.7 | 32 km S of Lima, Montana | Apr 02, 2026, 04:39 AM | 3 km | 95 km NE |
| M3.2 | 25 km E of Clayton, Idaho | Jun 08, 2025, 11:25 AM | 8 km | 97 km NW |
| M4.3 | 24 km E of Clayton, Idaho | Jun 08, 2025, 11:05 AM | 7 km | 95 km NW |
| M3.3 | 54 km NE of Mackay, Idaho | Apr 26, 2025, 11:12 AM | 10 km | 66 km NNE |
| M3.1 | 32 km S of Lima, Montana | Dec 04, 2021, 06:35 PM | 10 km | 95 km NE |
| M3.1 | 36 km SW of Lima, Montana | Jan 31, 2016, 01:00 PM | 5 km | 90 km NNE |
Earthquakes per year near Arco (M3.0 and up, within 100 km)
M3.0–3.9 M4.0+
Each bar is one year; taller means more quakes (M3.0 and up). The dark red part is the bigger ones (M4.0+), counted inside the number above each bar — not added on top. These may be felt, depending on how far away and how deep they are. 2026 is not a full year yet — it only counts up to today. Source: USGS Earthquake Catalog.
What the last year looked like near Arco
Every quake of M1.5 or bigger within 100 km over the last year — 5 in total. A quake of exactly M2.0 counts in the M2.0–3.0 group.
The 8 biggest earthquakes on record near Arco (M4.0 and up, since 1980)
| Mag | Location | Date (UTC) | Distance |
|---|---|---|---|
| M6.9 | The 1983 Borah Peak Earthquake, Idaho | Oct 28, 1983, 14:06 UTC | 65 km |
| M5.5 | 22 km E of Clayton, Idaho | Oct 29, 1983, 23:39 UTC | 97 km |
| M5.4 | 23 km E of Clayton, Idaho | Oct 29, 1983, 23:29 UTC | 92 km |
| M5.4 | 29 km NW of Mackay, Idaho | Oct 28, 1983, 19:51 UTC | 69 km |
| M4.4 | 25 km E of Clayton, Idaho | Dec 27, 1983, 12:21 UTC | 96 km |
| M4.3 | 24 km E of Clayton, Idaho | Jun 08, 2025, 17:05 UTC | 95 km |
| M4.3 | 36 km ESE of Clayton, Idaho | Nov 06, 1983, 21:04 UTC | 78 km |
| M4.3 | 21 km E of Clayton, Idaho | Nov 03, 1983, 01:50 UTC | 99 km |
Nearby places
Bellevue, ID (80 km) · Hailey, ID (83 km) · Moreland, ID (83 km)
USGS data fetched Nov 03, 2026, 21:45 UTC · page built Nov 03, 2026, 21:45 UTC. How to read this page: recent-window counts cover M1.5+ events within 100 km; the 10-year layer is based on M3.0+ and the history layer on M4.0+ since 1980. Recording completeness varies by era and region — small quakes from early decades are under-recorded, so “no record” does not prove “never happened”. Depths are relative to sea level and can be slightly negative for shallow events in elevated terrain. Method: data & methodology.