The country’s geophysics institute said between three and five explosions per hour were sending ash and lava spewing from the 16,480-foot mountain, located about 90 miles south of the capital of Quito.
Eruptions last week prompted the evacuation of hundreds of nearby residents.
Officials say they've recorded at least 135 explosions, including 15 longer events related to the movement of magma.
Tungurahua began its current eruptive phase in 1999.
Photo: Ecuadorian Geophysics Institute