A major underground nuclear weapons test rocked the Nevada desert at dawn today, unleashing a shock that measured 5.1 on the Richter scale.
Motion from the blast was recorded by monitors atop some high-rise hotel-casinos in Las Vegas, 85 miles from ground zero. Telephone operators at the resorts reported receiving no calls from guests inquiring about the blast. Thirteen protesters turned out at the main entrance to the sprawling desert site and 11 were arrested for trespassing. The test, code-named Ingot, was the third conducted at the Nevada Test Site this year. The shot carried a force up to 150 kilotons, the highest allowed under test limitation treaties.