Co-authored by Aldo A. Glean, John A. Judge, Joseph F. Vignola, and Teresa J. Ryan. This article appeared in Journal of Applied Physics 117.5 (Feb. 2015), p. 054505. This paper describes a method for detecting the presence of very small amounts of mass (such as pollutants, chemical or biological weapons, etc.) by observing changes in the vibration behavior of collections of microresonators when the targets of interest stick to the surface of one of more of the microresonators.