526 A devastating earthquake struck Antioch killing 250,000 people
1889 Johnstown Flood, over 2,200 people were killed after an earthen dam failed and sent a 60 foot wall of water over the town of Johnstown, Pennsylvania.
1935 Quetta Earthquake. A 7.7 Mw earthquake destroyed the town of Quetta in modern-day Pakistan killing 40,000 people and maybe as many as 60,000.
1970 Ancash Earthquake, A 7.9 Mw earthquake struck Peru with a maximum Mercalli Intensity of VIII which is Severe and a landslide that buried the town of Yungay, Peru. Between 66,794 and 70,000 people were killed and 50,000 injured. The death toll might have been as high as 100,000.
1985 United States –Canada Tornado outbreak: 41 tornadoes hit Ohio, Pennsylvania, New York and Ontario killing 76 people.
This is a day in history when tornadoes ripped through Ohio, Pennylvania, New York and Ontario in 1985. I lived in Harmonsburg, Pennyslvania at the time and remember these tornados quite well. To me the scene looked like what you would expect from a nuclear war. There was nothing left in many places. Seventy-six people were killed after 41 tornadoes touched down in this outbreak.