ldentifying Plate Boundarie Activit Using Figures 1 and 2 (see attached files in
ID: 116718 • Letter: L
Question
ldentifying Plate Boundarie Activit Using Figures 1 and 2 (see attached files in dropbox) as a guide, sketch with colored pencils on Figure 10 below: a. b. c. Convergent boundaries in red The Divergent boundaries in blue The transform boundaries in green Use arrows to indicate the relative plate motions across the boundaries 20 078 605 IU Figure 10. Shaded relief map of the world Activity 4: Earthquake and volcano evidence te tect We have already learned earthquakes usually occur on or near plate boundaries. Most of these earthquakes occur within the crust at depths of less than 50 km beneath the surface. Some earthquakes are found at depths of up to 700 km within the mantle. These deep focus earthquakes occur in planar zones of seismicity called Wadati-Benioff zones after the two seismologists who discovered them. These zones were first discovered in the 1930s, long before the discovery of plate tectonics but we now associate them with the subducted lithosphere. The zones extend from the trench downward increasing in depth in the direction of subduction. Figure 11 is a West to East trending profile across the western margin of South America at 23° S latitude. The upper plot shows the bathymetry and topography showing the Peru-Chile Trench and the Andes Mountains and the horizontal position of Holocene volcanoes projected into the profile. The lower plot shows the locations of earthquakes projected into the section. In this activity, you will plot the position of the subducted Nazca Plate beneath the South American Plate in Chile and Argentina. You will also compare the position of active volcanoes (red triangles) relative to the position of the trench and the earthquakes (blue crosses) in the zone.Explanation / Answer
1. Minimum elevation is 5 km above MSL and maximum elevation is around 10km below the MSL.
2.around 200km
3. Approximately 350 km - deepest earthquakes occur.
4. Around 200km depth
5. Wadati Benioff zone is a planar zone of seismicity corresponding with the down going slab in a subduction zone
Activity 5.
A).
1. Divergent plate boundaries are associated with young oceanic crust.
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