Posts Tagged ‘earthquakes’
Urgent: earthquake in Morocco
09
Sep
The news began to emerge in the early hours of 
Brazil, an earthquake measuring 6.8 on the Richter scale hit the center of Morocco approximately halfway between the historic cities of Agadir and Marrakech, the region is called Adassil, according to the country’s interior ministry 820 people have already died (the number exceeded 2000 in the early hours of Sunday), 672 people have been injured and 205 are in serious condition, according to the latest information.
People rushed into the streets and the earthquake was felt in Portugal, Spain and Algeria, an aftershock of magnitude 4.9 was felt 19 minutes later.
According to the United States Geological Survey, the epicenter was in the mountains known as the High Atlas, 71 km from Marrakech, at a depth of 18.5 km, the city was heavily hit and has a historic center declared a world heritage site, it occurred in middle of the night, but online newspapers don’t give the exact time.
Several governments declared solidarity and promised help, the pain is hard, but it awakens solidarity, even Zelesnky from Ukraine and Putin from Russia declare their regret.
All solidarity with the Moroccan people, the under-20 Brazilian team is there and there were no injuries.
Is it possible to induce an earthquake
08
Dec
We’ve heard of experiments carried out by the US Navy on the high seas 
intentionally causing small earthquakes, but unintentionally activities carried out on the ground can induce earthquakes, an international team of researchers documented the discovery of this new type in research carried out in British Columbia, Canada, and published in Nature Communications last month.
The earthquake was discovered when the team was studying an earthquake caused by hydraulic fracturing, a method used in western Canada to extract oil and gas, and that this is what characterizes the so-called induced earthquake, the action of pumping water into rocks, the saying goes soft water on hard stone, in this case it not only pierces but can cause an earthquake.
With a network of eight seismic stations, located around an injection well a few kilometers apart, the researchers led by Phd Hongyu Yu, from the Geological Research Institute of Canada and by Rebeca Harrington, professor of geology at University of Bochum recorded seismic data from approximately 350 earthquakes, of course all of low intensity but similar to the volcanic ones, and this suggests a few more observations on current eruptions.
The observation is that 10% of the identified earthquakes had unique characteristics, that they break more slowly, but very similar to volcanic earthquakes.
The analysis suggests that these earthquakes caused by human actions, are slower and have a long duration, and as they expand they become a mixture of the two types, therefore they are induced, and the conclusion is that human actions can cause and worsen the conditions for future earthquakes and eruptions in volcanic areas.
The two consequences are then that the fluid pumped into the rock generates a pressure increase sufficient to generate a network of fractures close to the well, while a second consequence is that the action exerts a change in elastic tension in the neighboring rocks that can be transmitted over distances longer, with serious consequences.
If before we imagined that only the vegetal part of nature should be respected, it was discovered that rocks, stream beds and stone deposits should also be taken care of.
