| − | The point along a [[fault]] where an [[earthquake]] begins.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>
| + | A '''focus''' is a point along a [[fault]] where an [[earthquake]] begins.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref> |