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Tsunami warning systems are in place around Indonesia, but they are tailored to earthquake tsunamis

Just over a week ago, the Indonesian volcano Anak Krakatau blew its top, losing about two-thirds of its height.

Most of this 150m cubic metres of rock is thought to have slid into the sea in one go, generating a tsunami that killed more than 400 people. Tsunami warning systems are in place around Indonesia, but they are tailored to earthquake tsunamis, triggering only if an earthquake and large wave are detected.

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