the lake fluctuated in size, depth, and temperature over time.

The lava lake activity is ongoing. as of 2020, the lake is mostly confined within a broad, steep-sided cinder cone (roughly 60 ft high by 600 ft wide) on the crater floor.

1977 eruption

Between 1894 and 1977 the crater contained an active lava lake. On 10 January 1977, the crater walls fractured, and the lava lake drained in less than an hour. The lava flowed down the flanks of the volcano at speeds of up to 60 km/h

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