Understanding of the Sumatran subduction zone and its hazards has increased since the 2004 Indian Ocean earthquake and tsunami.

Christmas in 2004, a 9.1 magnitude earthquake triggered tsunami waves that killed some 230,000 people across a dozen countries.

Within hours, the tsunami had claimed nearly 230,000 human lives and displaced millions of people in 12 countries. Thursday marks the 20 th anniversary of the 2004 Indian Ocean tsunami, one of the deadliest natural disasters in modern history. The Boxing ...