SFO runway crack (IMAGE) American Geophysical Union Caption San Francisco’s runways are sinking more rapidly than 14 other major coastal airports, according to new research to be presented at #AGU23 this week. Sinking can cause deformation, cracks, and sinkholes, posing risks to aircraft. Credit Liza Lester Usage Restrictions Credit must be given to the creator. License CC BY Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.