A vision of Chile on the South American plate in collision with the Nazca plate offshore.
called subduction is the process by which part of the oceanic crust, individualized lithospheric plate, one plate dives beneath continental character. The plates have separatist movements of approach, separate or approach each other, carried by the convection currents generated under them.
In the context of plate tectonics, plate edges affected by this process are called "edges destructive" because they occur in the melting of the crust. This merger will depend on the angle of penetration of a plate under the other. In any event, the hydrated oceanic crust, melts at low temperature resulting in the formation of magmas at shallow depths, and the generation of chains volcanic located on subduction zones.
The collision of lithospheric plates is also responsible for the formation of long and deep ocean trenches, the development of regional metamorphic processes, conditioned by the increase, a whole or individual pressure and temperature.
In areas of plate collision, the sudden release of accumulated tension results in earthquakes may reach great intensity and magnitude.
These earthquakes are located at different depths on the map Benioff, which is the level of friction on a plate slips beneath another. Shallow earthquakes are related to the onset of subduction and have their origin in the strain that occurs when the subducting plate is curved. The average depth earthquakes are related to the release of accumulated tension friction between the plates. Deep earthquakes are attributed to a process of contraction due to the rapid development of compact crystalline structures.
Plate Subduction Earthquakes and Benioff plane. (Kostoglodov and Pacheco, 1999. Simplified)
. ... And now we see another danger to our country:
0 comments:
Post a Comment