Volcanic Generation animation
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Tsunamis can be generated in volcanic settings both during an eruption and in periods of inactivity. Hot fast moving bodies of gas and rock (known as pyroclastic flows) can travel over the ocean, pushing the water outwards and creating a tsunami. Volcanic slopes are unstable and prone to landslide activity. Volcanic landslides both above and below the ocean's surface can displace the water column and generate a tsunami.
The 1883 Krakatau eruption in Indonesia caused tens of thousands of deaths, including 77 about 800 kilometres away from the eruption. The effect of the tsunami was reported up to 10 kilometres inland and one large ship was raised 10m above sea level and carried 3 kilometres inland.