Cal State East Bay’s Warren Hall Imploded – VIDEO
The old 13-story administration building was imploded at around 9 a.m. because it was the most seismically vulnerable building in the California State University system. Separately, scientists with the U.S. Geological Survey were also on hand for a quake study.
The Bay Area demolition was done with a bang, several actually – and took about 10 seconds followed by applause and cheers from the crowd.
A huge cloud of dust lingered on the campus for several minutes.
The implosion was proceeded by a warning horn 10 minutes before, 2 minutes before and one minute before the blast.
The building, which housed administrative officers and classrooms for four decades, was too tall to be taken down by crane, so the demotion team used 430 pounds of high explosives to blow up one side of the building. Gravity did the rest, experts said.
While most were interested in the explosion, scientists at the USGS were watching what happened underground after the building hit the ground.
Scientists seized the occasion to install nearly 600 seismic sensors within a 1.5-mile radius around the building to help them map fault lines and get a clearer look at the shaking caused by seismic events. The implosion was expected to create an effect similar to a 2.0-magnitude quake.
“We are trying to measure ground motion,” Geophysicist Rufus Catchings said before the demolition. “When the building comes down there will be a thump that will put seismic energy into the ground.”