I'm Chilean and I live in a "problematic" area. Fortunately it was not that hard. We're kind of prepared (of course, with nature, nobody is actually prepared for something like this) and the Government and the people are already evacuating those areas.
The sad part? A lot of people is evacuating using cars, and streets doesn't gave so much space to handle all that traffic. Internet and Mobile networks are still working and that helped to reach to almost anyone.
ONEMI, which is the emergency organism here, already published the expected hour the waves will arrive to those problematic areas, so some cities have plenty of time to evacuate.