Hundreds of spectators gathered to see a 13-story building implode in Hayward, located in the East Bay.
The Cal State East Bay’s Hayward’s Warren Hall fell to the ground without incident.
NBC Bay Area reported that the old administration building was imploded because it was deemed the most seismically vulnerable structure in the California State University system.
The demolition and collapse of the 13-story building was monitored by scientists to see its impact on the nearby Hayward Fault. The collapse of the 13,000 ton building magnitude-2.0 shockwaves, reported The Associated Press.
The building was constructed around 2,000 feet from the fault–which is considered one of the more dangerous ones in the United States.
The last major earthquake on the Hayward Fault was in 1868.
U.S. Geological Survey scientists set up more than 600 seismographs in circles around the building.
“We are trying to measure ground motion,” Geophysicist Rufus Catchings told NBC. “When the building comes down there will be a thump that will put seismic energy into the ground.”
“It was so fast it was over before you knew it,” onlooker Sally Lopez, 71, told KTVU.
“Wow, unbelievable,” Eva Heitmann of Vallejo told the San Jose Mercury News. “All I can say is, wow.”
And Hayward local Lachlan Riley-Wilson, who is 7, said that “besides sunsets that was the most amazing thing I’ve seen. My mouth was open.”