Two years ago, Oklahoma set out to survey its most earthquake-vulnerable buildings.

Today, state officials are no closer to knowing which of hundreds of public structures would be most likely to collapse during a severe temblor.

A team of volunteer experts the state expected to perform the work never did, citing concerns they might be held liable should their predictions be inaccurate.

The lack of information about which critical public facilities might survive a large-scale earthquake comes at a time of unprecedented seismic activity in the state and when some seismologists say the odds of a large-scale quake are growing.