Long dormant volcanoes can erupt rapidly and explosively,
[phys.org]

The open access paper is:

Cserép, B., Szemerédi, M., Harangi, S., Erdmann, S., Bachmann,
O., Dunkl, I., Seghedi, I., Mészáros, K., Kovács, Z., Virág, A.
and Ntaflos, T., 2023. Constraints on the pre-eruptive magma
storage conditions and magma evolution of the 56–30 ka
explosive volcanism of Ciomadul (East Carpathians, Romania).
Contributions to Mineralogy and Petrology, 178(12), p.96.

Yours,

Paul H.

"The past is never dead. It's not even past."
William Faulkner, Act 1, Scene III, Requiem for a Nun (1951)