Issues

Front: Latin American countries share similar history and culture as well as complicated tectonic settings. Most every country in the region has experienced at least one earthquake that has significantly impacted its society, infrastructure, and economy. In this issue, the Seismological Society of America (SSA) presents the SRL Focus Section on Geophysical Networks and Related Developments in Latin America. The focus section contains more than two dozen contributions that address the numerous networks that allow observation of tectonic processes in this vast region of the world. These topics and more will be the focus of Seismology of the Americas in Miami, Florida, 14–17 May 2018, a joint conference of the Latin American and Caribbean Seismological Commission and SSA.Back: Sleep and Olds (this issue) detail signs of fault displacement at well-known rock outcrops in Colorado (U.S.A.) that appear to mark the end-Cretaceous asteroid impact that may have hurried the extinction of the dinosaurs. They suggest that the impact, which occurred near Mexico’s Yucatán peninsula, could have generated massive seismic waves that triggered earthquakes as far away as Colorado, in the center of a tectonic plate where no previous fault had existed.