Earthquake Terror Grayson

I read about Jonathan and Abby were left in the woods by themselves.  Their mom had broken her ankle and their dad had to leave them and take her to the hospital.  As they were heading back to the camper, an earthquake hit.  The ground started shaking and they lost their balance.   Tree's were falling down all around them.  Abby lost her walker as she fell to the ground.  They had to climb under the fallen trees for protection.  The earthquakes seemed to last for hours.  When it was over,  they had to walk for a long time to get to their camper.  Once they got to it,  they found it under a huge redwood.  It had crushed the camper.  Everything they needed for survival was destroyed.  What would they do now?