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You are browsing the archive for Journal of Geophysical Research - Solid Earth Archives - GeoSpace.

19 March 2019

Western droughts caused permanent loss to major California groundwater source

According to new research, the San Joaquin Valley aquifer in the Central Valley shrank permanently by up to 3 percent due to excess pumping during the sustained dry spell.

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27 February 2019

Old stone walls record history of Earth’s magnetic wanderings

Some of the remnant walls snaking through the forests of New York and New England from long-abandoned early American farms can be used as references to deduce the position of Earth’s magnetic field in previous centuries.

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28 November 2018

New automated volcano warning system forecasts imminent eruptions

Scientists have developed an automated early warning system for volcanic eruptions, according to a new study. The new system helped government officials warn the public of impending eruptions in Italy and could potentially do the same around the globe, according to the study’s authors. The new research details the new system that monitors volcanic noises and automatically alerts officials if an eruption is imminent. The study’s authors tested this system over a period of eight years on Mount Etna, a volcano on the island of Sicily. Using the new system, the Italian government activated an emergency plan about one hour prior to an eruption for the first time in late 2015.

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19 November 2018

Oil extraction likely triggered mid-century earthquakes in Los Angeles

Six independent earthquakes and two aftershocks of magnitude 4.4 to 5.1 shook LA between 1935 and 1944, a rate of about one every two years. A new study re-examined historical information about the earthquakes from archived damage reports to refine the earthquake locations identified by early earth-motion sensors, placing them closer to many active oil fields.

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30 July 2018

Study reveals how sand dunes alter seismic waves

A new study finds that sand dunes act like seismic echo chambers and suggests new ways to filter out the noise they create in seismic surveys.

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16 October 2017

Waves in lakes make waves in the Earth

Scientists at the University of Utah report that small seismic signals emanating from lakes can aid science. As a record of wave motion in a lake, they can reveal when a lake freezes over and when it thaws. And as a small, constant source of seismic energy in the surrounding earth, lake microseisms can shine a light on the geology surrounding a lake.

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27 April 2017

Glass formed by volcanic lightning could be used to study eruptions

Researchers have developed a method to measure one of the most striking and difficult to measure volcanic features – volcanic lightning – using the tiny glass spheres formed by hot volcanic ash.

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16 May 2016

New study maps rate of New Orleans sinking

New Orleans and surrounding areas continue to sink at highly variable rates due to a combination of natural geologic and human-induced processes, a new study finds. The observed rates of sinking, known as subsidence, were generally consistent with, but somewhat higher than, previous studies conducted using different data.

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13 May 2016

New research estimates probability of mega-earthquake in the Aleutians

A new study estimates the probability of a Magnitude 9+ earthquake in the Aleutian Islands—an event with sufficient power to create a mega-tsunami especially threatening to Hawai‘i. In the next 50 years, there is a 9 percent chance of such an event, according to researchers from University of Hawai‘i at Mānoa.

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3 May 2016

Scientists find likely cause for recent southeast U.S. earthquakes

The southeastern United States should has seen some notable seismic events – most recently, the 2011 magnitude-5.8 earthquake near Mineral, Virginia that shook the nation’s capital. Now, scientists report in a new study a likely explanation for this unusual activity: pieces of the mantle under this region have been periodically breaking off and sinking down into the Earth.

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