Both minor eruptions. And the Tongariro eruption was hydrothermal, not magmatic -- ie. just letting off some steam.
But, whatever. If the other two volcanoes do decide to do their thing, which they show absolutely no signs of doing so at present, then, yes, this would be interesting.
What sort of time-frame should we be looking at for this to happen? Days, weeks, years?
Considering it has been dormant for 115 years I would expect any magmatic eruption to be preceded by a hydrothermal eruption.
Time frame? I personally believe DAYS to weeks (at most) for Tongariro. It will not go back to sleep (dormant) again anytime soon, that is FOR SURE !
It may take months for the other to go off.
See below for more information.
Thank you for the polite feedback, hard to come across here on GLP :)
[link to geonet.org.nz
"It is too early to predict the next series of events, but we expect heightened activity may continue for several weeks. There are likely to be specific signals of future magma movement beneath the volcano and we continue to monitor the situation through the GeoNet volcano-seismic network of instruments.
As with any volcano, an eruption could occur at Tongariro at any time with little or no warning
and there is an elevated level of risk, particularly on the northern slopes and valleys of the mountain."