Skip to main content
8 votes

Can garbage be sent into the (near-)center of the world?

No. In fact, I don't know why David Hammen didn't say that instead of commenting. The deepest hole that mankind ever dug was barely a scratch on the Earth's surface when you look at its size. They ...
Bruzote's user avatar
  • 199
8 votes
Accepted

Volcanoes in the Alps and Himalayas and the subduction of Tethys Sea

The end of the Tethys Sea and the initiation of the continent-continent collision that formed the Himalayas is thought to have happened about 65 Ma ago (recent studies suggest maybe only 35 Ma). And ...
Camilo Rada's user avatar
  • 17.7k
7 votes

Megathrust earthquakes on subduction zones

Megathrust is not a particularly well defined term but in my experience it generally refers to very large earthquakes that occur on the subduction interface. The subduction interface is the main ...
bon's user avatar
  • 2,211
5 votes

When did the proto-Himalayas become non-volcanic?

We don't know for sure because A. the evidence has almost all been erased by the continued crustal shortening of the area where the volcanic arc(s) would have been. B. the region is huge and volcanism ...
Ash's user avatar
  • 4,290
5 votes

How does a subduction zone form mountains?

When the subducted oceanic plate slides beneath the continental crust, it causes crustal thickening and sometimes crustal folding. In addition to this, rising plumes of magma are created when the ...
Michael Walsby's user avatar
5 votes
Accepted

Are the Olympic Mountains (in Washington state) geologically unique?

Short answer: yes, there are other mountains which contains oceanic crust in their lithologies. The process you described as "the upthrust of ocean crust" is called obduction. The resulting rock ...
Jean-Marie Prival's user avatar
5 votes

Megathrust earthquakes on subduction zones

Yes, mega thrust earthquake can occur in any point of any subduction zone. However, some areas areas are much more active than others, meaning that the frequency of earthquakes and energy released per ...
Camilo Rada's user avatar
  • 17.7k
5 votes
Accepted

Why are there no subduction trenches on continental land?

Continental crust is thick and relatively buoyant. Ocean crust is much thinner, and relatively dense. Hence ocean crust "goes down" more easily, and the density can even help pull the ocean ...
winwaed's user avatar
  • 3,893
4 votes
Accepted

How does 10mm/yr of plate subduction provide enough material to create eruptions?

Yes, the situation is much more complex than you make out - the generation of melt is typically caused by partial melting of the mantle wedge located beneath the volcanic arc. This process is mainly ...
Conquistador's user avatar
4 votes

Why are there no subduction trenches on continental land?

As mentioned in another answer: Continental crust is thick and relatively buoyant. Ocean crust is much thinner, and relatively dense. Let's look at a simulation of what might happen. Here's a figure ...
Gimelist's user avatar
  • 23.1k
3 votes

Can garbage be sent into the (near-)center of the world?

One of the flaws with using subduction zones as dumps for toxic chemicals so they can be broken down by heat and pressure at depth is the rate of sinking of the subducting plate. Subduction is a very ...
Fred's user avatar
  • 24.7k
3 votes
Accepted

Is there any diferrence between arc magmatism and post-collisional extension magmatism?

The answer is yes, but the differences, if you mean tangible differences in composition and nature of the melt and not just primary melt source, are minor and technical. This is a complex subject but ...
Josiah's user avatar
  • 143
2 votes

How does 10mm/yr of plate subduction provide enough material to create eruptions?

10mm a year is a huge volume when you multiply with lithosphere thickness and length of the boundary, but you are right - it's more complex than this. Melting is caused by the interplay of ...
user2821's user avatar
  • 5,946
2 votes

Will California become a subduction zone in the distant future

Before the transform process of the San Andreas Fault zone we know today, there was indeed a subduction zone event taking place in this same region near now coastal California during the late Jurassic ...
Gianne Deaux's user avatar
2 votes

Is the concept of seismogenic zone still relevant after the 2011 Japan earthquake?

Tohoku is the seismogenic zone, the asperity model explained this small repeating earthquake well. It was said massive earthquake will occur in Nankai Trough. As their expectation was wrong, [Kato and ...
Takahiro Waki's user avatar
2 votes
Accepted

Is COMSOL Multiphysics good for subduction CFD modelling? Are there alternatives?

numerical modelling is a vast field and the tool to address your problem depends strongly on ... your problem and your approach! Are you a master student? a PhD student with very short time to wrap up ...
EarlGrey's user avatar
  • 459
2 votes

Can garbage be sent into the (near-)center of the world?

There's easier ways to mitigate toxic waste, Since most is often metal, converting it into stable oxides and proper landfilling mitigates most of the danger. Incineration at temperatures above 2800 ...
LazyReader's user avatar
1 vote

What forces plays the role in order to subduct the denser tectonic plate under the lighter plate?

Once subduction starts, it tends to keep going because the sinking slab pulls the material behind it. This is "slab pull", which dominates over "ridge push" at a subduction zone. ...
David Hammen's user avatar
  • 23.7k
1 vote

How is felsic magma produced at island arcs?

You are correct that arc magmas are produced by melting of the mantle wedge above the subducting slab. In the case of felsic rocks in island arcs, a model I have not seen debunked is that these ...
desander's user avatar
  • 415
1 vote

Tectonic plates terminology

Tectonic plates almost all comprise a mix of both oceanic and continental crust in different areas. The exceptions are all minor plates. Where the edges of these plates spread apart you get divergent ...
Ash's user avatar
  • 4,290
1 vote

When did the proto-Himalayas become non-volcanic?

To begin with, the formation of the Himalayas was never volcanic which is why you don't find volcanic rocks in the Himalayas. As for the subducting Indian oceanic plate (which contained Indian ...
Knob Scratcher's user avatar
1 vote

Can garbage be sent into the (near-)center of the world?

Your idea may seem weird, but it is what has been done for decades in the US and elsewhere. You do not need to reach the centre of the earth. 3 to 4 km may suffice (Terms and Conditions apply ...) ...
EarlGrey's user avatar
  • 459
1 vote

Does subduction of continental crust happen at continental-continental convergent boundaries?

Both of the processes you describe occur; in some cases such as the Himalayas the plates are not subducted and a moving plate, in this case the Indian plate, bulldozes the continental crust ahead of ...
Michael Walsby's user avatar
1 vote
Accepted

Is there a name for subduction boundaries at the North of Australia?

I do not think there is one name for the area. Rather it is a region with multiple plates, namely the Timor Plate, the eastern portion of the Banda Sea Plate, the Maoke Plate and the Woodlark Plate, ...
Rokman's user avatar
  • 124

Only top scored, non community-wiki answers of a minimum length are eligible