The map shows quakes of M1.5 and up from the last 90 days, the 2 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 Sleepy Hollow. The biggest quake on record near Sleepy Hollow — records go back to 1980 — was the M5.0 of May 29, 1984, 20:18 UTC: 37 km W of Gillette, Wyoming.
Latest earthquakes near Sleepy Hollow
| Mag | Location | Local time | Depth | Distance |
|---|---|---|---|---|
| M3.0 | 43 km WSW of Gillette, Wyoming | Sep 26, 2016, 11:39 PM | 14 km | 47 km W |
| M4.9 | 41 km W of Gillette, Wyoming | Sep 07, 1984, 06:59 PM | 20 km | 47 km W |
| M5.0 | 37 km W of Gillette, Wyoming | May 29, 1984, 02:18 PM | 18 km | 43 km W |
Earthquakes per year near Sleepy Hollow (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.
The 2 biggest earthquakes on record near Sleepy Hollow (M4.0 and up, since 1980)
| Mag | Location | Date (UTC) | Distance |
|---|---|---|---|
| M5.0 | 37 km W of Gillette, Wyoming | May 29, 1984, 20:18 UTC | 43 km |
| M4.9 | 41 km W of Gillette, Wyoming | Sep 08, 1984, 00:59 UTC | 47 km |
Nearby places
Antelope Valley-Crestview, WY (4 km) · Gillette, WY (9 km) · Moorcroft, WY (38 km)
USGS data fetched Nov 03, 2026, 17:10 UTC · page built Nov 03, 2026, 17:11 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.