Tectonics Case Study Facts

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Destructive Margins


Juan de Fuca and North American

18th May 1980 date of MSH

57 deaths

200 houses destroyed

Level 5 explosivity index

24 megatons of energy released

1.1billion loss to economy

10 weeks back to normal



Nazca and South American plates

13th November 1985 date of NDR

23000 deaths

5000 houses destroyed

Level 3 explosivity index

4 lahars

7.7billion  loss to economy

- 20% of


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