The most disastrous natural calamities are:– Earthquakes with a magnitude of 10.1 richter scale. And this is the highest magnitude of earthquake ever recorded in past 66.5 million years ago when a massive asteroid hit at the earth's North American continent at Chixculub in Mexico which as a result it wiped out all dinosaurs and created a mass extinction event.
Created a depth of 20kms deep below the average land surface and 150kms wide crater.