TOKYO, April 20 (Reuters) - A magnitude 7.7 earthquake struck off the northeastern coast of Japan on Monday, prompting authorities to urge residents to stay away from coastal areas where tsunami waves of up to 3 metres (10 ft) were expected.

Google Trends and social media platforms have been flooded with searches for tsunami and tsunami warning after stunning satellite images showing a massive tsunami forming in the open ocean went viral.

SWOT satellite captured a Pacific-wide tsunami in high-resolution, revealing complex wave patterns that challenge tsunami forecasting models.

The Mediterranean is famous for its calm waters and idyllic coasts. Yet, beneath this peaceful surface, a very real threat looms. This enclosed sea is indeed exposed to tsunamis that can strike