How would a Tsunami occur on the west coast of India?

Tsunamis in general are mostly caused by earthquakes, particularly large subduction zone earthquakes. The Makran subduction zone lies just offshore Iran and Pakistan, and has produced significant earthquakes in the past. read more

Technically, the 2004 Indian Ocean earthquake and tsunami also caused a tsunami along the western coast of India, but since the waves were diffracted around the southern tip of the subcontinent, they were significantly weaker than those seen along the eastern coast. read more

3 m (9.8 ft) on the opposite side of the coast of Weh Island facing the tsunami. The tsunami height on the Banda Aceh coast were lower than half of that on the west coast. The tsunami height was reduced by half from 12 m (39.4 ft) at Ulee Lheue to 6 m (19.7 ft) a further 8 km (4.97 miles) to the northeast. read more

So, historical evidence suggests that we have plenty of ways for a major tsunami to hit the West Coast of the US. There are other threats, too. Mauna Loa, on the Big Island on Hawaii, is large shield volcano that is notorious for its eruptive past. read more