Alaskan Seismometers Record the Northern Lights

alaska aurora

29 July 2020–Aaron Lojewski, who leads aurora sightseeing tours in Alaska, was lucky enough to photograph a “eruption” of brilliant pink light in the night skies one night in February. The same perturbations of the Earth’s magnetic field that lit up the sky for Lojewski’s camera were also captured by … Continue Reading »

“Lettere Patenti” Help Assess Intensity of Historic Central Italian Earthquakes

Roman administrative document

13 May 2020–Three hundred-year-old administrative documents from the Roman government, granting residents permission to repair damage to their buildings, can help modern-day seismologists calculate intensities for a notable sequence of earthquakes that struck central Italy in 1703. Details gleaned from these “Lettere Patenti” offer a unique glimpse at the geographical … Continue Reading »

Catalog Shows Complex Rupturing During 2019 Ridgecrest Sequence

22 January 2020–The 2019 Ridgecrest earthquake sequence, which startled nearby California residents over the 4 July holiday with magnitude 6.4 and magnitude 7.1 earthquakes, included 34,091 earthquakes overall, detailed in a high-resolution catalog created for the sequence. The catalog, developed by David Shelly at the U.S. Geological Survey in Golden, … Continue Reading »