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Deep volcanic earthquakes were only recorded three times between Nov. 16 and on Sunday, while the deformation equipment or tiltmeter on the peak showed a horizontal pattern on the radial axis and a slight inflation on the tangential axis.

The tiltmeter and GPS data showed no change in the run-up to or during the eruption.

Next year, scientists will install a tiltmeter and other sensors in an existing borehole near the subduction zone.

A bottom-pressure tiltmeter will measure gradual changes that could indicate that the volcano is inflating, and a cutting-edge mass spectrometer will sniff the water for hints of magma rising from below.

Slight changes in the slope of the volcano’s flanks, as measured by a device called a tiltmeter, would suggest that gases were continuing to build up below as they bubbled out of the magma, causing the surface to bulge, or were dissipating.