I doubt prayers could really do anything regarding an earthquake. everyone could pray in advance for every country and such events would still happen.
The magnitude is exponentially many times higher that the quake that hit PaP / Haiti, yet the fact that Chile has a better infrastructure has limited the loss of life to very few casualties compared to Haiti.
When I was in Haiti in sept 2008 shortly after the 4 hurricanes many people there pray a lot and were hoping for a miracle. about a year later they get a terrible quake. fighting poverty, corruption, explotation is a lot more efficient than prayers.
I raised money for a pregnant single woman so she could get a C section in a hospital rather than in someone's backyard or unsafe clinic.
all of you...Please stay safe, where ever you are. Listen to the warnings and do what you have to .
You are all in my thoughts and prayers
Well at least here waves aren't predicted to be exceptionally high - but I think the warning was due to 'better safe than sorry' - I don't know how bad Hawaii may get hit.