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Boring to study slow earthquakes


Drill preparation. The team prepare the deep-sea drill for use on the seafloor. © 2021 JAMSTEC-IODP
Slow earthquakes are long-period earthquakes that are not so dangerous alone, but are able to trigger more destructive earthquakes. Their origins lie in tectonic plate boundaries where one plate subsides below another. Though the causal mechanism is already known, there has been a lack of data to accurately model the life cycle of slow earthquakes. For the first time, researchers use deep-sea boreholes to gauge pressures far below the seafloor. They hope data from this and future observations can aid the understanding of earthquake evolution.
The surface of the Earth lies upon gargantuan tectonic plates. The edges of these interact in different ways depending on the plates’ relative movement, composition and density. Where plates collide and one sinks below another is known as a subduction zone, often the site of what are known as slow earthquakes. These are low-frequency ....

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Fukushima at ten


Fukushima at ten
March 13, 2021
It’s now 10 years since the catastrophic triple meltdowns of reactors at Fukushima in Japan. As Joseph Mangano of the Radiation and Public Health project put it three years ago, “Enormous amounts of radioactive chemicals, including cesium, strontium, plutonium, and iodine were emitted into the air, and releases of the same toxins into the Pacific have never stopped, as workers struggle to contain over 100 cancer-causing chemicals.”
There is news of the shortage of Fukushima health studies, big earthquakes (aftershocks) and typhoons rattling nerves, reactors and waste systems, novel radioactive particles dispersed, and corporate and government dishonesty about decontamination. ....

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Tectonic wobbles and muddy deposits: The seismic clues leading up to 3/11


Mar 8, 2021
The blue arrows on the map splay out like uncooked spaghetti tossed into a pot as geophysicist Jonathan Bedford presses play.
Ten years after the March 11, 2011, Great East Japan Earthquake which upended long-held views about where megaquakes were likely to strike scientists like Bedford, a researcher with the GFZ German Research Center for Geosciences in Potsdam, are developing new tools to better understand the threat, while others are digging deep into the past in a search for geological clues.
Each arrow on Bedford’s animated analysis represents tiny movements over time most at a speed of well under 1 millimeter per day of the Japanese archipelago, as detected by the thousands of highly accurate GPS stations that dot one of the world’s most seismically active countries. Red circles spring up now and then to mark an earthquake. ....

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