COLORADO SPRINGS, Colo. — Four families in Yoder are building a sand bunker and stockpiling ammunition and weapons.

A Black Forest resident has erected a geodesic dome on her 5-acre spread to grow vegetables, keeps horses for emergency transportation, in case she can't get gasoline for her car, and plans to acquire chickens and goats as food sources.

A husband and wife who have a cabin on 100 acres of secluded land in Park County have weaned their property from the electric grid, acquired a three-year food supply and taken other measures to become self-sufficient.

While there's little threat of the earthquake and tsumani that rocked Japan last month in landlocked Colorado, other epic crises on the home front are possible: A flood or fire. A terrorist attack. A nuclear weapons launch. World War III. Or an apocalyptic-type scenario.

An increasing number of people say they are getting ready.