The Core (2003) movie

In the 2003 movie The Core, Earth's core has stopped spinning and within the geomagnetic force to which some forms of life have adapted, not only do mysterious catastrophes begin to occur but at least one geophysicist has figured out what's going on. Even more unbelievably, not only is there a device capable of reaching the Earth's core, an unlikely plan to restart its rotation by exploding nuclear bombs is devised. Since the United States Army had caused the Earth's core to stop rotating, it's totally up to U.S.A. technology and heroes to spin it up again save us all from doomsday.