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Warren Hall, Cal State East Bay's former administration building and East Bay icon, imploded as planned, by the contractors. (Photo: Garvin Tso)

• August 17, 2013

• By Barry Zepel

Warren Hall, the former signature building of the Hayward Campus of California State University, East Bay that housed administration offices and classrooms for more than 40 years, was successfully demolished by implosion on Saturday morning, Aug. 17. Thousands of people watched from public locations throughout Hayward and the East Bay.

The campus will officially reopen at 6 a.m. Monday, Aug. 19. For safety reasons it had been closed Friday evening, Aug. 16.

The 13-story Warren Hall, which opened in 1971, was determined by the California State University Seismic Review Board to be the most seismically vulnerable building in the CSU system. It had been empty for about two years, as most of the offices that once occupied Warren Hall were moved to a new structure, the Student Services Administration (SA) building on the east side of the campus.

The demolition process isolated and then imploded the key structural supporting elements of the building. With the demolition contractor using specially timed charges, the 194-foot structure leaned slightly to the west and then fell in the predetermined area, away from nearby campus buildings.

Scientific research will benefit from the implosion. With Warren Hall sitting about half a mile from the Hayward Fault, the U.S. Geological Survey – in cooperation with the university – observed and recorded the implosion on hundreds of seismographs temporarily set up within a 1-mile radius of the demolition. The data gathered will help characterize the underground geology around the fault in three dimensions. The resulting data will be analyzed by USGS scientists for the next few months.

More information about the USGS-CSUEB research, called the , is available online.