Question

If $a,b,c$ are positive integers less than $13$ such that\begin{align*}

Answer 1

Earthquakes can cause all of the above.

trigger other earthquakes - when there is a large magnitude earthquake it
lead to shake the earth's surface. Thus it can create more earthquakes on the same place or neighboring places.

cause billions of dollars - when there is a large disturbance it can destroy big buildings, homes, etc. Which is basically a billion dollar loss.

cause tsunami - If there is a disturbance in the earth's surface near sea's, etc there is chance of tsunami.