The Greek Root Word "Seismos" G:4578 is describing turmoil and not Earthquakes. In Matthew 28:2 it describes an Angel of the Lord descending from heaven and because of his descent through the air to the ground he caused a great earthquake. Well, I for one know that you cannot have an earthquake in the air, but I do know that if we saw an angel descending through the air to the ground that there would be great turmoil among the people on the ground if the Angel descending came to step onto the ground near you.
Earthquakes are not a sign of the coming of the end of the Ages, but great turmoil among the people of the earth are a sign of the coming Great Judgement of all of mankind at the end of the seventh age.
Why are earthquakes increasing at the present time? Because the bulk temperature of the earth is increasing and that increase in the bulk temperature of the earth is increasing the strain of the stresses in the earth's crust/mantle and the releasing of this strain and stress we experience as the earth's crust vibrating violently.
Who is in control of the increase of the bulk temperature oof the earth? Why God is in control and this increase in the bulk temperature of the earth and earthquakes and dynamic changes in our weather patterns are signs that there is something wrong with the global relationship of people everywhere with God.
God in His conversation with Solomon spoke of this and also told Solomon that if the people who are called by His Name will humble themselves and confess their sins that He will hear from heaven and heal the land.
Sadly, many people believe that we mere earthlings, if we do "a", "b" and "c", can overturn what God is allowing to happen because we have turned away from God.
The signs are there that we, the people of God, have turned away from God and need to globally repent of our sins that is impacting our world today.
Shalom.