Shallow Mexican seabed traps tsunamis so they strike land repeatedly
Tsunamis can keep pummelling the same patch of coast for days at a time if conditions are right. The finding means the initial big wave may not be the only source of danger, and authorities might need to rethink their evacuation responses following a tsunami alert.
On 8 September 2017 a deadly magnitude-8.2 earthquake struck Mexico – the first of two major tremors in the area that month. The quake caused a tsunami in the Pacific Ocean. It reached a maximum height of three metres when it hit the …