A new model of a fundamental process of Earth’s global dynamics


Pacific Ring of Fire

The tectonic plates that form the Earth’s surface are like puzzle pieces that are in constant, very slow motion – on average, they move only up to around 10 centimeters a year. But these puzzle pieces don’t quite fit together: there are zones on one plate that end up plunging under another – the so-called subduction zones, central to the dynamics of the planet. This movement is slow, but it can lead to moments of great energy release and, over thousands of years, large mountain ranges or marine trenches are formed in these regions.

How do these subduction zones originate, and how do they evolve over time? Geologists already knew that in these zones, on a time scale of thousands of years, this process can stagnate and reverse itself, giving rise to new subduction zones. But it was still necessary to know how this happens, and to include in the models the various (and enormous) forces involved in this process. For the first time, it was possible to simulate in three dimensions one of the most common processes of formation of new subduction zones, ensuring that all forces are dynamically and realistically modeled, including Earth’s own gravity…

Each of the simulations that led to these results took up to a week to process on a supercomputer at the Johannes Gutenberg University (Germany). But it could have taken weeks, or even months, to run on this supercomputer – had it not been for the computational code recently developed at this University, significantly more efficient than other available codes…

This model opens up a new range of perspectives and represents the starting point for studying specific regions of our planet: “We are now applying these models to specific cases, such as the subduction zones that are starting in the Atlantic Ocean, in the Caribbean, the Scotia Arc, next to Antarctica, and on the Southwest Portuguese margin, and which could lead to the closing of the Atlantic Ocean. The 1755 Lisbon earthquake may have been the harbinger of the beginning of subduction on our margin, and there are marine geology data that support it”, concludes João Duarte.

Progress, the frequency of new and/or improved analyses change with the quality of methods of analyzing data…analyzing the analyses drawn from this data. It can affect us all, eventually.

BTW – The second link in this post brings you to a good deal more information and detail.

3 thoughts on “A new model of a fundamental process of Earth’s global dynamics

  1. Underfoot says:

    The Rio Grande rift is a north-trending continental rift zone. It separates the Colorado Plateau in the west from the interior of the North American craton on the east.
    The Rio Grande follows the course of the rift from southern Colorado to El Paso, where it turns southeast and flows toward the Gulf of Mexico. Important cities, including Albuquerque, Santa Fe, Taos, Española, Las Cruces, El Paso, and Ciudad Juárez, lie within the rift. https://en.wikipedia.org/wiki/Rio_Grande_rift
    In geology, a rift is a linear zone where the lithosphere is being pulled apart and is an example of extensional tectonics. https://en.wikipedia.org/wiki/Rift
    A craton is an old and stable part of the continental lithosphere, which consists of Earth’s two topmost layers, the crust and the uppermost mantle.

  2. Lisbon 1755 says:

    [video src="https://upload.wikimedia.org/wikipedia/commons/transcoded/0/06/Tsunami_Forecast_Model_Animation-_Lisbon_1755.webm/Tsunami_Forecast_Model_Animation-_Lisbon_1755.webm.480p.vp9.webm" /]

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