Archives par mot-clé : Earthquakes

Evaluating active pressure management of induced earthquakes

by Seismological Society of America, May 17, 2018 in ScienceDaily

The experiments conducted by Lawrence Livermore National Laboratory researcher Kayla Kroll and her colleagues were prompted by a recent spike in induced earthquake activity related to oil and gas production in the U.S. and Canada. The rise in induced earthquakes has some scientists proposing changes in injection or production processes to reduce the fluid pressures that destabilize faults in these regions.

In their simulations, Kroll and colleagues “found that active management was most advantageous for wells that were closest to a fault. This scenario is most successful at reducing the total number of seismic events and also the maximum magnitude of those events,” Kroll said. In their simulations, a “close well” was one to four meters away from a fault (…)

Small earthquakes caused by migrating gasses in the underground

by GFZ GeoForschungsZentrum Potsdam, Helmholtz Centre, May 1, 2018 in ScienceDaily

The metropolitan area of Istanbul with around 15 million inhabitants is considered to be particularly earthquake-prone. In order to be able to assess the risk correctly, researchers must decipher the processes underground. Below the Marmara Sea, an international research team detected earthquakes that were not directly caused by tectonic stresses but by rising natural gas.

Earth’s Rotation Is Mysteriously Slowing Down: Experts Predict Uptick In 2018 Earthquakes

by Tevor Nace, November 20, 2017 in WhoaScience

Scientists have found strong evidence that 2018 will see a big uptick in the number of large earthquakes globally. Earth’s rotation, as with many things, is cyclical, slowing down by a few milliseconds per day then speeding up again.

You and I will never notice this very slight variation in the rotational speed of Earth. However, we will certainly notice the result, an increase in the number of severe earthquakes.

Geophysicists are able to measure the rotational speed of Earth extremely precisely, calculating slight variations on the order of milliseconds. Now, scientists believe a slowdown of the Earth’s rotation is the link to an observed cyclical increase in earthquakes.