People often pray in time of need or suffering. Prayers should be a daily happening giving thanks, asking for help, praying for those who are ill or facing death.
God knows our problems before we ask, but the power of prayer is awesome. Never underestimate the energy created when we are quiet at prayer. "Ask and thou thalt receive" is an often overlooked Bible phrase. Believe that your prayer is heard and know that perhaps this is not the proper time or place to be answered.
With the dreadful earthquakes, and other upheavels in the world remember to ask for understanding and pray for those in the midst of these disasters.