The 11th announced underground nuclear weapons test of the year was detonated Thursday beneath the desert at the Nevada Test Site, 80 miles northwest of Las Vegas.

"The test was successful and there was no radiation leakage," said Energy Department spokeswoman Barbara Yoerg.The test, triggered at 7 a.m. was code named Dalhart. Its yield was less than 150 kilotons, according to U.S. Department of Energy officials.

Dalhart was buried 2,100 feet beneath the surface of Yucca Flat at the federal nuclear test ground.

People in several Las Vegas high rise buildings in the downtown area felt swaying motions from the blast.