The strongest tornado, rated a maximum EF5 on the Fujita Tornado Scale, tracked for nearly an hour and a half along a 38-mile path from Chickasha through south Oklahoma City and the suburbs of Bridge Creek, Newcastle, Moore, Midwest City and Del City.

CNN: Oklahoma City area was hammered by EF5 tornado in 1999

Explaining his decision to hand McCormick the maximum possible sentence, the judge focused on the scale of the fraud and its potentially deadly consequences.

CNN: Maker of fake bomb detector gets 10 years in prison

With the collapse of the Soviet Union, the maximum challenge the United States faced came from regional adversaries on the scale of Iraq and Afghanistan.

CENTERFORSECURITYPOLICY: Center for Security Policy | The Measure of a Superpower: A Two Major Regional Contingency Military for the 21st Century | Page: 2

But the authors of the new study focus on the significantly larger and delayed events in Prague, which they wrote "necessitate reconsideration of the maximum possible size of injection-induced earthquakes, and of the time scale considered diagnostic of induced seismicity".

BBC: Oklahoma earthquake linked to oil extraction wastewater