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An earthquake
post-volcanic phenoma are the things which happen before an eruption.
The are a smalls earthquake..
An earthquake happened 17 years before the eruption.
Earthquakes
what precautionary mesures beforeand after
no there were not
The only updates available before a volcanic eruption are those issued by local meteorologists and geologists. They can issue updates based on observed changes in the volcano.
Preferably, to a safe distance from the volcano.
They didn't prepare. The Lake Toba eruption was 74,000 years ago, before the development of civilization. The people around at the time were hunter-gatherers. They didn't know what a volcano was or how to prepare for an eruption.
increase in both frequency and intensity
magma falls from underground to form an opening in the volcano