What is the basic driving force for the plate movement of the earthquake of 1989?

What process in the Earth and early atmosphere allowed land-dwelling species to evolve? Who is the new weather girl at KPIX Channel 5? What horizon contains the most living things in soil? How do you make 50 mM potassium phosphate buffer pH 7.4? What are the strongest magnets other than super conducting magnets? In the molecule chlorine makes five covalent bonds Therefore five of its seven valence electrons need to be unpaired How many degenerate orbitals are needed to contain seven electrons with five o? What is the theoretical number of moles of hydrogen gas should be produced when 0.068 mol of sodium metal reacts? What is -65 degrees Fahrenheit in Celsius? How will Earth's crust change over time? How does mining salt affect the Earth's surface? Which way does water move when it gets to the water table? Why collect hydrogen gas in a test tube rather than glass jar? How many oxygen atoms does phosphate ion have? Is it true that Georg Brandt discovered cobalt? What is the third most abundant gas in earth's atmosphere? What is one result of uneven heating of earth? How are oxygen and nutrients passed to cells? Which layer of the earth is the place where convection occurs? Is technology hurting the earth? If hydrochloric acid is added to sodium hydroxide the temperature increases but there is no visible change did a chemical or physical change occur?

What is the basic driving force for the plate movement of the earthquake of 1989?