Words:0 Path: p QUESTION 10 Now go back to the central Andes (the Alliplano) Wha

Question

Words:0 Path: p QUESTION 10 Now go back to the central Andes (the Alliplano) What statement best describes the distribution of earthquake depths across this region (e.g. from W to E)? O a The earthquakes become shallower from W to E across the central Andes. Ob. The earthquakes remain a constant depth from W to E across the central Andes. The earthquakes become deeper and deeper from W to E across the central Andes. Od. The earthquak ary in a random fashion throughout the region. 1 p QUESTION 11 What is the approximate depth of earthquakes along the active volcanic arc. Oa. 0-30 km Ob. 30-70 km O c. 100-150 km Od Always greater than 150 km Click Save and Submit to save and submit. Click Save All Answers to save all answers

Explanation / Answer

Answer.10

a. The earthquake becomes shallower from W and E across the central andes.

Answer.11

c. 100 - 150km

Explanation - Volcanic arc, a chain of active volcanoes which parallels the deep ocean trench. Beneath the active volcanic arc lie intrusive igneous rocks formed from magma that didn't make it all the way to the surface before crystallizing. The volcanic arcs may be volcanic island arcs (e.g., Aleutians, Mariannas) where one oceanic plate subducts beneath another oceanic plate, or continental volcanic arcs(e.g., Andes, Cascades). The volcanic arc lies where the Benioff Zone earthquakes are around 100 km beneath the surface but Benioff zone earthquakes continue past this, landward down to 60 km. Therefore the slab has not melted away

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