1.1 Flashcards
Tectonic Hazards
earthquakes and volcanic eruption
secondary hazards such as tsunami
How are Tectonic Hazards Classified
Seismic or Volcanic
Distribution of Earthquakes Reveals the Following Patterns of Activity
- Oceanic fracture zone (OFZ)
- Continental fracture zone (CFZ)
- Scattered
Distribution of Earthquakes Reveals the Following Patterns of Activity: Oceanic fracture zone (OFZ)
belt of activity through oceans along midocean ridges, coming ashore in Africa, the Red Sea, the Dead Sea rift and California
Distribution of Earthquakes Reveals the Following Patterns of Activity: Continental fracture zone (CFZ)
belt following the mountain ranges from Spain, via Alps, to the Middle East, the Himalayas to the East Indies and then around the Pacific
Distribution of Earthquakes Reveals the Following Patterns of Activity: Scattered
in continental interiors
What is Distribution of Earthquakes
70% are in ‘Ring of Fire’
95% of all earthquakes occur along
boundaries. most powerful are at convergent or conservative boundaries.
Rare intra-plate volcanoes (hotspots) happen away from plate boundaries. These are associated with upwelling or mantle plumes
What is Distribution of Volcanoes
vast majority happen around plate boundaries
although solely at destructive and constructive where there is an opening in lithosphere
Major Plate
form the bulk of the continents and the oceans
The 3 Types of Plates on the Earth
Major. form the bulk of the continents and the oceans
Minor plate
Micro plate
How are Hotspot Volcanoes and What They Form
Formed when magma rises to the surface.
Magma erupts through oceanic crust. Lava builds up on the surface over time to form volcanic islands.
As oceanic crust moves over hotspot, chains of islands develop
Example of a volcanic island
Hawaii
Rift Valley
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