and the speed of the plates varies. Sometimes they can be as slow as two centimeters per year, and other times they can move as fast as ten centimeters per year. The area where the two plates meet with each other is called a boundary. There are three distinct ways these boundaries move with each other. One the three types are called convergent boundaries. Convergent boundaries are anywhere where the two areas of land move toward one another, causing collision. Most collisions created by convergent boundaries take last as long as a million years. A lot of times, subductions occurs from the collision of convergent boundaries. Subduction is the process in which the oceanic plate is pushed and forced toward the mantle of the Earth. As the oceanic plate subducts, the plate increases in temperature. After going as deep as one hundred miles, the plate then begins to melt. Magma chambers form as a result of the subduction, and over periods of…
creation of the motion diverging plates and it is an underwater mountain range which are formed by plate tectonics. It consist of mountains linked together, having a valley running along the spine, and its known as an oceanic spreading center which is in charge of the seafloor spreading. New seafloor is being produced when convection currents rise in the mantle layer which is under the oceanic crust, it then create magma that cools down into basalt where two plates is push away from each other.…
The location I chose for this assignment is my home county, San Diego. San Diego is known for having the best weather in the United States, which it can attribute to its geology.
San Diego is also well known for consistent droughts; however, its current unique geography is a result of ancient rivers and seas depositing Cretaceous and Tertiary sedimentary rocks. As a result of these ancient rivers, “San Diego County can be divided between three distinct geomorphic regions: the Coastal Plain…
It makes up 40% of the Earth’s surface and has a density of 2.6 grams per centimetre cubed. It has a thickness of 35-70 kilometres.
Oceanic crust consists of dark coloured rocks made up of basalt known as mafic. Mafic is an igneous rock made of mainly magnesium and iron. Oceanic rock is also 7-10 kilometres thick. It has a density of 3 grams per centimetre cubed.
9. Define the terms subduction, mid-ocean ridge, and ocean trench and island arc.
Subduction is when two tectonic plate’s…
all. It isn’t unusual to have earthquakes along plate boundaries, as the plates aren’t the smoothest things in the world. The plates could catch or get stuck on each other until the pressure building up becomes too much and one buckles, falling or is pushed up suddenly against the other, creating an earthquake. There also tends to be earthquakes near volcanoes, which is exactly the situation on the east and west sides of the plate, though on the north and south there are no volcanoes. The east…
Engr 597 Tectonics
Formation of the Rocky Mountains
• How did they form?
• Sevier orogeny
• Laramide orogeny
• prevailing theory (flat slab subduction)
1. Very low angle subducting slab
2. rubbing against underside of North American plate
3. first proposed by william dickinson (1978)
4. another good paper Peter Bird (1988)
• Alternative theories
1. Craig jones - suction model
2. (maxson, Tikoff 1996) - Hit and run collision model
"I 'll come…
Which mountain building event does this correspond to on your sea level curve?
Compression was a driving force as evidenced by the curvature in the cross-section of sediment. Such force could occur at convergent boundary, which could be where two continental crusts collide or the subduction of oceanic crust below continental crust. When two continental crusts collide compression forces crust to displace both up and down. In a subduction zone when an oceanic plate falls below a continental plate…
Describe in detail the three theories that were the predecessors to plate tectonic theory. Provide evidence of how features of the surface support the current, theory of plate tectonics describing the ways the tectonic plates interact and the result of their interactions.
The Continental Drift Theory
The Continental Drift can help the surface support the current by plowing through ocean basins. It also did not include seafloor spreading or subduction. So, that did not cause an…
The Inner Core, Outer Core, Mantle, Asthenosphere, and Lithosphere, or, as more colloquially known, the five layers of the Earth. Although each layer is important, each living thing resides on the Lithosphere, which happens to rest on the Asthenosphere, the upper part of the Mantle. Forces caused by these two layers both contribute to the theory of Plate Tectonics, which happens to be interconnected to Earthquakes and Volcanoes.
Without Plate Tectonics, the other two occurrences simply cannot…
Earthquake Case History:
2010 Mw = 8.8 Mega-thrust Earthquake, Maule, Chile
By Travis Eddy
In early 2010 central south Chile experienced a Mw = 8.8 earthquake and large tsunami waves that devastated areas on the Chilean Pacific coast, nearby offshore islands, and areas near the epicenter. In addition to the tsunami, the earthquake had many other geological consequences including aftershocks, terrestrial and submarine land-sliding, elevation changes, and a gravity…