Tsunami Flashcards
1
Q
Tsunami Deposits
A
Tsunami deposits in coastal BC often include a sand layer with organic layers above and below it.
These organized layers are the remains of the forest soil that was there before and after the tsunami happened.
The organic remains in the soil provides the carbon can be used to absolutely date the tsunami.
2
Q
Tsunami Hazard in BC
A
Most large earthquakes originate under the Pacific Ocean off the west coast of Vancouver Island.
Historic tsunami deposits are confined to those coastlines exposed to the Pacific Ocean.
Sheltered areas such as the straight of Georgia and Juan de Fuca Straight are less prone to Tsunamis.
These deposits suggest a large earthquake with a tsunami occurs about every 300 years.
