BSSA is the premier journal of advanced research in earthquake seismology and related disciplines. It first appeared in 1911 and was issued on a quarterly basis until 1963. Since 1963, it has appeared bimonthly (in February, April, June, August, October, and December). Subscriptions are sold by the annual volume only. Each issue is composed of scientific papers on the various aspects of seismology, including investigation of specific earthquakes, theoretical and observational studies of seismic waves, inverse methods for determining the structure of the Earth or the dynamics of the earthquake source, seismometry, earthquake hazard and risk estimation, seismotectonics, and earthquake engineering. In addition to full-length papers, each issue contains a section of "Short Notes" for comments on previously published items or for brief, topical contributions.