Journal Highlights

Mapping a Valparaíso Earthquake from Foreshock to Aftershock

Research Spotlight—

Using seismic data recorded along the Chilean coast, scientists retrace the development of a recent earthquake. 

A massive arc of seismic activity—stretching from Australia to Japan, up toward Alaska, and down along the west coast of the Americas—is known among geologists as the Ring of Fire. Roughly 90% of the world’s earthquakes occur there. 

In April 2017, a swift but powerful magnitude 7 earthquake hit off the coast of Valparaíso, Chile, near the base of the Ring of Fire. About 2 days before it began, scientists detected intense seismic activity in the region. In a new study, Ruiz et al. zeroed in on this earthquake to better understand the formation, or nucleation, of earthquakes, as scientists do not know exactly why or how earthquakes start, become larger, and stop....more

-- Sarah Witman, Freelance Writer,

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Featured Special Collection

A Census of Atmospheric Variability from Seconds to Decades 

The atmosphere varies naturally on all length scales from millimeters to thousands of kilometers, and on all time scales from seconds to decades and longer.  This special collection of Geophysical Research Letters synthesizes and summarizes that variability through a phenomenological census.  The collection brings together some of the most influential and definitive papers to have been published in this journal in recent years.  The topics covered include turbulence on time scales of seconds and minutes, gravity waves on time scales of hours, weather systems on time scales of days, atmospheric blocking on time scales of weeks, the Madden–Julian Oscillation on time scales of months, the Quasi-Biennial Oscillation and El Niño–Southern Oscillation on time scales of years, and the North Atlantic, Arctic, Antarctic, Pacific Decadal, and Atlantic Multi-decadal Oscillations on time scales of decades.  The collection is accompanied by a Commentary article, which provides an authoritative, concise, and accessible point of reference for the most important modes of atmospheric variability.

A Census of Atmospheric Variability from Seconds to Decades