Natural Disasters, May 1

1875    Southwest Tornado outbreak

1895    Kansas-Iowa Tornado outbreak

1929    Rye Cove, Virginia Tornado Outbreak, 44 people are killed.

1939    Kopet Dag Earthquake shakes the Iran-Turkmenistan border region with a maximum Mercalli intensity of IX which is violent, killing up to 3,800 and injuring 1,121 people. (It is a 7.2 Mw

Mw is the moment magnitude scale. The w stands for work. Mw = 2/3 log10 (Mo) -10.7 where Mo is the seismic moment in dyne cm.

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