On 10 June 1886 Mount Tarawera erupted, killing over 100 people. Ash darkened the sky, and earthquakes were felt over a wide area.
More on Tarawera can be found here.
The Pink and White Terraces, destroyed in the eruption, were a major tourist attraction of the day. Recently it's emerged that the Pink Terrace may still exist, deep under Lake Rotomahana. Just this morning I heard on the radio that the White Terrace, too, may have been found.
In my book Mud and Gold, Frank doesn't realise that it's the distant eruption causing the earthquakes giving Lizzie and him a broken night. Something rather closer to home is claiming his attention: