1.3.5 Patterns of earthquakes
- Created by: Beulah4444
- Created on: 04-01-17 17:49
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- Patterns of earthquakes
- Earthquake:
- A vibration in the rocks of the Earth's crust and upper mantle caused by a dislocation of rocks along a fault.
- Where?
- Seismic areas: stresses are acting in the crust and upper mantle.
- Mid-ocean areas
- MOR: Shallow focus
- Rising magma producing harmonic waves. Detected as earthquakes.
- Axial rift systems: Shallow focus
- Extension of crust forms normal faults. Movement along faults (subsidence) = earthquakes.
- Transform fault: Shallow focus
- Horizontal movement along faults.
- MOR: Shallow focus
- Subduction zones
- Deep ocean trench + fold mountains
- Further inland foci are deeper (towards fold mountains) where 1 plate subducted beneath the other = benioff zone
- Shallow under deep ocean trench and oceanic sides of fold mountains
- Deep ocean trench + fold mountains
- Mid-ocean areas
- Depth of focus
- Shallow focus 0-70 km
- Intermediate 70-300 km
- Seismic areas: stresses are acting in the crust and upper mantle.
- Earthquake:
- Collision zones
- Shallow and medium earthquakes along deep faults.
- Conservative, slide past e/o = shallow.
- Subduction zones
- Deep ocean trench + fold mountains
- Further inland foci are deeper (towards fold mountains) where 1 plate subducted beneath the other = benioff zone
- Shallow under deep ocean trench and oceanic sides of fold mountains
- Deep ocean trench + fold mountains
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