where do tsunamis commonly occur
1 Where do tsunamis most often occur in the world? 2  Tsunamis occur most often in the Pacific Ocean and Indonesia because the Pacific Rim bordering the Ocean has a large number of active submarine earthquake zones. Tsunamis occur most often in the Pacific Ocean and Indonesia because the Pacific Rim bordering the Ocean has a large number of active submarine earthquake zones. 2  However, tsunamis have also occurred recently in the Mediterranean Sea region and are expected in the Caribbean Sea as well.