Mount MantapAftershocks here never actually stopped.
Residents of North Hamgyong province live above ground whose stress state may have permanently changed.
Six blasts between 2006 and 2017 should have triggered fading tremors, but geologists instead found seismic activity persisting for years.
Seismic monitoring is how outside observers verify tests North Korea does not show them.
How each outlet framed it
- Phys.org
- documents unexpected sustained seismic activity years after 2017 test, contradicting post-detonation models
Sources: Phys.org