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26 June 2018
The formation mechanism of the Adirondack Mountains in upstate New York has long posed a geologic mystery. A few mechanisms have been proposed, but until recently tools for evaluating them were not in place. Now, using an advanced seismic imaging method and data available only in the past five years, researchers have constructed a detailed model of the tectonic plate – the crust and the uppermost rigid mantle of the lithosphere under the northeast United States – down to about 62 miles (100 kilometers), in which they discovered a “pillow” of low-density, relatively light rock material. They say a column of this lighter material appears to have squeezed up under the Adirondacks, possibly expanded by heat, to form the dome-shaped mountains.
12 June 2018
A summertime expansion in the Earth’s crust caused by changes in groundwater may have triggered the magnitude-6.0 earthquake in California’s wine country in 2014, according to a new study.
30 May 2018
Instruments designed to record earthquakes revealed information about debris-ﬂow speed, the width of the ﬂow and the size of boulders carried by the January 2017 mudslide in Montecito, California, and the location of the event, suggesting that the current generation of seismometers in the ﬁeld could be used to provide an early warning of an incoming debris ﬂow to residents in mudslide-prone areas.
11 December 2017
New research reveals that mysterious intraplate seismic zones underwent significant deformation hundreds of millions of years ago.
5 December 2017
Dark fiber: Using sensors beneath our feet to tell us about earthquakes, water and other geophysical phenomena
Scientists have shown for the first time that dark fiber – the vast network of unused fiber-optic cables installed throughout the country and the world – can be used as sensors for detecting earthquakes, the presence of groundwater, changes in permafrost conditions, and a variety of other subsurface activity.