Seismic events at test sites
green0 events / 7d
32 stored readings in 7 days. Never amber or red in this window.
No shallow M3+ events near Punggye-ri, Lop Nur, Novaya Zemlya, or the Nevada test site in the last 7 days. Fixed thresholds: amber at 1, red at 2. Status green.
Shallow (under 15 km) M3+ events within 60 km of Punggye-ri, Lop Nur, Novaya Zemlya, or the Nevada test site, plus anything USGS types as an explosion near them. USGS often labels a test an earthquake at first, so location matters more than type. Fixed thresholds: amber at 1, red at 2. Source: USGS, observed 2026-10-29 16:00 MDT.
USGS nuclear explosion events
green0 events / 30d
32 stored readings in 7 days. Never amber or red in this window.
No events classified as a nuclear explosion in the last 30 days. Fixed thresholds: amber at 1, red at 1. Status green.
Events USGS has classified as a nuclear explosion anywhere in the last 30 days. Any one is red. Source: USGS, observed 2026-10-29 16:00 MDT.
Gamma dose rate, Salt Lake City
green75 nSv/h
32 stored readings in 7 days. Amber or red in 10, first at 2026-10-29 12:15 MDT.
Salt Lake City gamma dose rate 75 nSv/h at 2026-10-29 13:58 MDT. Level z +1.18 over 48 prior points. 1-step rate z n/a. Status green from the level check (amber 2, red 3, direction higher).
Hourly gamma dose equivalent rate at the EPA RadNet monitor in Salt Lake City, against its own 2-day baseline. Normal background there runs about 50 to 80 nSv/h, and rain or a winter inversion can push it toward 100 for a few hours, so amber needs about 16 nSv/h over the baseline and red about 24. It also needs another lane to alert. EPA posts with a lag of several hours. Source: EPA RadNet, observed 2026-10-29 13:58 MDT.