What would happen if the Earth's axis changed and which earthquake shifted Earth off its axis?
More tilt means more severe seasons warmer summers and colder winters; less tilt means less severe seasons cooler summers and milder winters. It's the cool summers that are thought to allow snow and ice to last from year-to-year in high latitudes, eventually building up into massive ice sheets. A similar calculation performed after the 2004 magnitude 9.1 Sumatran earthquake revealed it should have shortened the length of day by 6.8 microseconds and shifted Earth's figure axis by about 7 centimeters, or 2.76 inches.
Let us analyze the change in the axis of rotation of the Earth after the strongest earthquakes. https://www.emsc-csem.org/
Attached is a graph of changes in the coordinates of the Earth's rotation axis. https://hpiers.obspm.fr/
This is the strongest earthquake in the solid shell of the Earth:
Magnitude Mw 9.0
NEAR EAST COAST OF HONSHU, JAPAN
Date time 2011-03-11 05:46:23.0 UTC
Location 38.30 N ; 142.50 E
Depth 22 km
This is the strongest earthquake in the liquid shell of the Earth.
Magnitude Mw 8.3
Region SEA OF OKHOTSK
Date time 2013-05-24 05:44:48.0 UTC
Location 54.91 N ; 153.34E
Depth 598 km
The dates of these earthquakes are shown by arrows.
Comments are not needed.
I think that circular/polar plot that Dr. Borys added has in it's origins the torque provided by the zero-wavenumber draconic/nodal lunar cycle. When that cycle of 27.2122 days is impulsed by the annual cycle, the result is a 433 day forced response as in the wobble of a spinning top (the non-spherical Earth). That happens to be exactly the Chandler wobble period. Researchgate is the place to discuss such obviously overlooked mechanisms. Once this fundamental explanation is pinned down, we can then look at 2nd-order mechanisms such as perturbations due to earthquakes.
More tilt means more severe seasons warmer summers and colder winters; less tilt means less severe seasons cooler summers and milder winters. It's the cool summers that are thought to allow snow and ice to last from year-to-year in high latitudes, eventually building up into massive ice sheets. Earth rotates at around 1,000 miles an hour. If that motion stopped, the momentum would send everything flying in an easterly direction. Earthquakes, tsunamis, and other natural disasters would erupt all across the globe. NASA scientists using data from the Indonesian earthquake calculated it affected Earth's rotation, decreased the length of day, slightly changed the planet's shape, and shifted the North Pole by centimeters. The earthquake that created the huge tsunami also changed the Earth's rotation. The tilt of Earth's axis is the main cause of the seasons. If Earth had no tilt, then the length of daylight and the intensity of solar heating seen by a person standing at a single place on the surface would be the same all year round. The March 11, magnitude 9.0 earthquake in Japan may have shortened the length of each Earth day and shifted its axis
The tilt is one thing, but the wobble (actually wobbles as there can be more than one) is a different thing. The Chandler wobble magnitude is very slight in contrast to the angle of the tilt , but even slight changes can have a big effect because these are variations relative to the inertia of the system.
The earthquake rearranges the mass of the Earth, and therefore the figure axis moved by about six-and-a-half inches. The March 11, magnitude 9.0 earthquake in Japan may have shortened the length of each Earth day and shifted its axis Perhaps more impressive is how much the quake shifted Earth's axis. Gross calculates the quake should have moved Earth's figure axis (the axis about which Earth's mass is balanced) by 2.7 milliarc seconds (about 8 centimeters, or 3 inches). The last time a tilt of 12 degrees was recorded was about 84 million years ago when dinosaurs ruled the Earth, scientists claim. A similar tilt is currently underway on Earth, caused as a direct consequence of climate change, a study from April found. Now, there is evidence of Earth's axis movement in the past. Earth spins at an angle of around 23.5 degrees; if that axial tilt were to change enough to spin sideways on its axis; whole portions of the planet could be plunged into darkness or thrown into direct sunlight for months at a time. It is a common trope in disaster movies: an earthquake strikes, causing the ground to rip open and swallow people and cars whole. The gaping earth might make for cinematic drama, but earthquake scientists have long held that it does not happen. It is normal for the Earth's axis to move by a few centimeters each year. But, in the 1990s, the direction of polar drift shifted suddenly and the rate of the drift accelerated. More tilt means more severe seasons warmer summers and colder winters; less tilt means less severe seasons cooler summers and milder winters. It's the cool summers that are thought to allow snow and ice to last from year-to-year in high latitudes, eventually building up into massive ice sheets.