Prayers for all those killed and their surviving families.
For me, that should be the focus of prayer -- getting souls to heaven. We should pray for charity, but also hope, and that people have faith.
My point is that those that die might be lost forever. I pray that souls end up in the book of LIFE. A person trapped in rubble and lay dying has a chance to ask God for forgiveness. If they die, they may go to heaven, and may not have much time in the Catholic concept of "Purgatory". The Bible refers to the Book of Life.
BUT I DO NOT WANT PEOPLE TO SUFFER.
The children of Fatima (Portugal) suffered greatly (Francisco and Jacinto) before they died, but went to heaven.
They were happy to face death because for them DEATH it was a way to enter HEAVEN immediately after death.
Remember the story of the man lowered on a mat to Jesus in the Gospel.
In the Gospel, the man lowered on the stretcher, Jesus forgave the man his sins. He did not immediately cure him.
When people questioned if Jesus could "forgive sins", Jesus told the man to pick up his mat, and "walk".
The point being that getting to heaven is the most important thing. We will all die, and hopefully in a state of grace.
When something like this happens, people have a chance "to convert".
Additionally, Christian organizations will render aid (a chance to spread the Christian message).
Mother Teresa of Calcutta (and her sisters) converted many not by promoting the gospel, but showing charity, and "living the Gospel."