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You are browsing the archive for earthquakes Archives - AGU Blogosphere.

23 May 2019

Aftershocks of 1959 earthquake rocked Yellowstone in 2017-18

Aftershocks from large earthquakes can take their time coming — almost six decades in the case of Yellowstone’s deadly Hebgen Lake earthquake of 1959.

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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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12 March 2018

Mexico’s 2017 earthquake emerged from a growing risk zone

Under Mexico, where the Cocos Plate from the Pacific Ocean slides under the North American Plate, a bending line of hills, created when the seafloor first formed, sits atop a flattened area of subduction. That newly recognized combination has created a fault that likely explains last September’s Puebla earthquake, scientists report in a new study.

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11 December 2017

Ancient weakening of Earth’s crust explains unusual intraplate earthquakes

New research reveals that mysterious intraplate seismic zones underwent significant deformation hundreds of millions of years ago.

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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.

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30 August 2017

Computer earthquake prediction in lab shows promise

By listening to the acoustic signal emitted by a laboratory-created earthquake, a computer science approach using machine learning can predict the time remaining before the fault fails. Not only does the work have potential significance to earthquake forecasting, but the approach is far-reaching, applicable to potentially all failure scenarios, including avalanches and other events.

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5 January 2017

What was that rumble? New research compares earthquakes to explosions

The earth shakes similarly after earthquakes and underground explosions, making it hard to distinguish between the two types of rumbling events. A new study aims to capture the subtle details of seismic signatures and ground deformation after an explosion to help scientists better differentiate between them.

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15 November 2016

New maps reveal safe locations for wastewater injection

Geophysicists have compiled the most detailed maps yet of the geologic forces controlling the locations, types and magnitudes of earthquakes in Texas and Oklahoma. These new “stress maps” provide insight into the nature of the faults associated with recent temblors, many of which appear to have been triggered by the injection of wastewater deep underground.

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29 August 2016

New study identifies next faults to fail along California-Nevada border

A handful of faults lining the border of California and Nevada may be near the point of rupture, according to a new study assessing earthquakes in the region as far back as 1,400 years ago. Scientists report that earthquakes in a fault network east of the Sierra Nevada Mountains are not random, but are likely triggered from stress bestowed by past earthquakes. This same type of stress has built up in six faults near Death Valley, California, and Reno, Nevada, according to the new research.

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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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13 April 2016

2012 Texas earthquakes may have been man-made

Analysis of a series of earthquakes in East Texas in 2012 has found it plausible that the earthquakes were caused by wastewater injection. Previous studies relied on the timing and proximity of wastewater injection to earthquakes to decide if earthquakes were induced by human activity. This was the first to simulate the mechanics of an earthquake generated by water injection for this site.

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1 December 2015

Seismic risk in eastern Mediterranean higher than previously estimated

The eastern Mediterranean is more seismically active than previously assumed, a new study finds. On a geological time scale, seismic activity around the island of Crete has generated large earthquakes in bursts, potentially increasing the future risk for earthquakes and tsunamis in the region.

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17 September 2014

Shake, Rattle and Frack

A new study was published today in the Bulletin of the Seismological Society of America, by three USGS scientists, and it’s the latest in a growing number of scientific studies that show that deep injection of waste water during fracking is causing earthquakes. It seems pretty likely that a quake will do damage in a fracking zone soon, and all this science will be moved into a courtroom. The graph …

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26 August 2014

Intrigued by Earthquakes and Volcanoes? It’s Easy to Become Geologically Literate

Meteorologists in general do not know much about Geology, but broadcast mets are usually the first person newsroom producers (and the public) turn to when there is an earthquake, tsunami, meteor showers etc.  I had a couple of great courses in Geology working on my masters, and a field trip to the Washington State was a fantastic learning experience, and it left me with a lifelong fascination of rocks and …

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