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The turnout was thin in Berkeley on Thursday for ShakeOut, an earthquake drill that has expanded to seismic-prone areas across the globe. It’s the 10th anniversary of the drill, which was conceived as a way to remind California residents of the dangers of earthquakes — and to remind them to drop to the floor, cover their head and neck, and crawl under a desk when they feel the shaking start.

Forrest Lanning, the earthquake program manager in California for FEMA, warned the handful of reporters in attendance at the Berkeley event that many Californians will be “on their own” after an earthquake hits.

“FEMA is not going to be able to come in and save everybody,” he said.

Mr. Lanning, an engineer who lived for four years in New Zealand when that country was rebuilding after the series of earthquakes in Christchurch, said one of the biggest problems California will face after an earthquake is housing. In a state already suffering a homeless and housing crisis, a large earthquake could force hundreds of thousands of people out of their dwellings.

Mr. Lanning said there were no good answers about how California will handle earthquake homelessness.