Because Jesus says that Earthquakes are one of the indicators of the Beginning of Sorrows for the World.
These earthquakes happen prior to the start of the Great Tribulation (which is listed as beginning in Matthew 24:21, Mark 13:19, and Luke 21:23).
There was an earthquake when Jesus was crucified (Matthew 27:54), plus the Bible records that there was a great earthquake that removed the stone from His tomb (Matthew 28:2) and another one that freed Paul and Silas from prison (Acts 16:26).
What should we be doing? Luke 21:34; Mark 13:33
Examining ourselves to see if we are in the faith. The Church will be in a state of Apostasy. Like Israel they were pretending to obey God but their hearts were far from him. Many who think they are saved will not be saved because they were deceived by false teachers or complacent with family traditions. Being told their whole lives what good Christians they were but in their hearts they were lying. God knows your heart and He reads it to see what you are.
If you are not saved and have been pretending then it does not hurt to go to the Lord now where ever you are and ask to be forgiven and Read the Word of God for yourself.
Read the Word and make sure what you Believe is your convictions not your parents convictions.
Many who look good on the outside will not go to be with their family.
Make sure you are saved no Grandchildren in heaven!
Matthew 3:9 And think not to say within yourselves, We have Abraham to our father: for I say unto you, that God is able of these stones to raise up children unto Abraham.
Matthew 7:22 Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works?
You must be born again!
How ? Ask!
I hope you meet the Savior and make him your personal Savior !