According to plate tectonic theory, the Earths surface is made up of slabs of rock that are slowly shifting right under our feet.
Because of this constant movement, todays Earth looks a lot different from what it did millions of years ago. In todays animation, Visual Capitalist's Carmen Ang looks at the Earths tectonic plate movement from 1 ga (geological time for 1 billion years ago) to the present-day, via EarthByte on YouTube.
The Emergence of Plate Tectonic Theory
Plate tectonics is a relatively new theoryin fact, according to National Geographic, it hadnt become popular until the 1960s. However, the concept of continental movement was brewing long before it became widely accepted.
In 1912, German scientist Alfred Wegener proposed a theory he called continental drift. According to Wegeners theory, Earths continents once formed a single, giant landmass, which he called Pangaea.
Over millions of years, Pangaea slowly broke apart, eventually forming the continents as they are today. Wegener believed this continental drift explained why the borders of South America and Africa looked like matching puzzle pieces. He also pointed to similar rock formations and fossils on these two continents as proof to back his theory.
Initially, the scientific community wasnt on board with the theory of continental drift. But as more data emerged over the years, including research on seafloor spreading, the theory started to gain traction. The Supercontinent Cycle
Nowadays, its believed that Pangea was just one of several supercontinents to mass together (and break apart) over the course of geological history.
The exact number of supercontinents is largely debated, but according to the Encylopedia of Geology, here are five (including Pangea) that are widely recognized:
Kenorland: 2.7-2.5 billion years ago
Nuna/Columbia: 1.6-1.4 billion years ago
Rodinia: 950800 million years ago
Pannotia: 620-580 million years ago
Pangea: 325-175 million years ago
According to the theory, this cycle of breaking apart and coming together happens because of subduction, which occurs when tectonic plates converge with one another.
The supercontinent cycle also ties into ocean formation. The below example of the Wilson Cycle specifically keys in on how the Atlantic Ocean, and its predecessor, the Iapetus Ocean, were formed as supercontinents drifted apart:
Source: Hannes Grobe The Importance of Plate Tectonics
Plate tectonics has been a game-changer for geologists. The theory has helped to explain tons of unanswered geological questions, assisting scientists in understanding how volcanoes, mountains, and ocean ridges are formed.
Its also valuable for the oil and gas industry since it explains how sedimentary basins were created, allowing geologists and engineers to target and locate vast oil reserves.
Since the theory of plate tectonics is relatively new, theres still a lot to be discovered in this field of research. However, in March 2021, a report was published in Earth-Science Reviews that, for the first time, visualized a continuous plate model that shows how Earths plates have shifted over the last billion years.
The video above visualizes this particular report and accurately depicts the Earths tectonic plates movement or the observed shift in Earths tectonic plates over the years.
Poster Comment:
Reno, Nv is 25 miles west of Los Angeles, Ca.
The West Coast from SoCal to Washington state and the New Madrid fault (from Memphis to St Louis and 200 miles distant) will be toast in a few years.