Earthquake activity: Bristol-area historical earthquake activity is significantly above Wisconsin state average. On, a category F4 tornado 20.0 miles away from the town center killed 6 people and injured 75 people. wind speeds 207-260 mph) tornado 15.3 miles away from the Bristol town center injured 20 people and caused between $500,000 and $5,000,000 in damages. 2019: 13 buildings, average cost: $235,400īristol-area historical tornado activity is near Wisconsin state average.Single-family new house construction building permits: