Final answer:
The narrow zone of earthquakes down to 670 km in the mantle is commonly found in subduction zones, where tectonic plates move into the mantle, causing seismic activity. The mantle's composition under high temperature and pressure facilitates this movement, leading to earthquake formation.
Step-by-step explanation:
The narrow zone of earthquakes in the mantle down to a depth of 670 km is typically associated with areas known as subduction zones.
These are regions where one tectonic plate moves sideways and downwards into the mantle beneath another plate.
The downward movement of the plate into the mantle creates high pressure and temperature conditions, leading to the formation of earthquakes.
The mantle itself, which extends down to 2900 kilometers beneath the Earth's surface, is mainly solid but can still deform and flow slowly under certain temperatures and pressures.
The density of the mantle increases with depth, and this contributes to the tectonic activities observed in subduction zones.
Earthquakes occurring at various depths, such as those shown in the color-coded earthquake depth map, are a direct result of these subduction processes.
Subduction zones are key areas for understanding seismic activities and are closely monitored using seismometers, as they are responsible for some of the most destructive earthquakes in history.
Furthermore, the sliding of tectonic plates at these zones can be measured and predicted to an extent, providing valuable data for geologists and aiding in the assessment of earthquake risks.
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Narrow zone of earthquakes in the mantle down to 670 km