Reading 3 Questions-1
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GEOG 2152: Geography of Hazards
Reading #3 Review Questions
1.
Describe what occurs in the lead-up to a megathrust earthquake.
- the tectonic plates move toward one another continually, but they can get stuck when in contact,
creating over long periods of time an immense buildup of strain that eventually will exceed the
friction between them and once that point/ threshold is reached the earthquake occurs
2.
How does a core sample from the ocean floor reveal a past earthquake event?
-
the sample brings up a core sample that showcases the result of an earthquake
it does not look like much but is a anomalous band of rock and chunks of wood debris that tells
a story that thousands of years ago a megathrust earthquake came through Vancouver island and
triggered a landslide and the debris fingerprint had been shown in the sample
3.
Why was the Christchurch earthquake of 2011 a surprise to scientists?
-
it was a surprise to scientists because they did not anticipate the size of the earthquake as they
didn’t believe the region was capable of producing anything stronger than a magnitude 8
earthquake (about 32 times less powerful than magnitude 9 the earthquake was eventually
determined to be)
It was a magnitude 6.3 earthquake and scientistis also didn’t know about the fault in the region
until a less damaging 7.1 earthquake occurred in 2010
The 2011 tremor was very destructive because of occurring at a depth of 4 km and 10km outside
of Christchurch while the 2010 quake was 10km deep and 40km outside city
4.
What is the proposed reason for the seismic activity on Baffin Island in Nunavut?
- in this region the proposed reason for the seismic activity may be caused by the ground slowly
rising thousands of years after the glaciers that one covered the area melted. – this movenement
is called post glacial rebound
5.
What is currently occurring on Vancouver Island that provides a clue to a potential
future earthquake there?
-
the physical aspect that the surface of the island is bulging upward 2 millimetres per year on the
western edge. It shows where the North American plate and the juan de fuca plate are locked,
which stores the greatest amount of energy. As well highway 4 is the eastern edge of a potential
rupture zone for a megathrust earthquake
`
6.
What are the beneficial applications of the motion sensors that Oceans Network Canada
is currently prototyping on Vancouver Island?
-
the ONC is installing a dozen of hypersensitive motion sensors all across and offshore norther
Vancouver island which will be able to detect and report rapidly the seisemic waves before they
approach Vancouver and Victoria. The potential applications are great, airports can stop planes
from taking off/ land or gas companies can turn off their supply or change the lights on bridges
to red
7.
How have the Indigenous Peoples on the west coast of the island been preparing for a
potential tsunami?
-
they are building their homes on a hill as well as building a subdivision on that hill and the
local daycare centres choose to run regular practice drills with the kids
8.
Based on the window forecasted by the scientists at the Sidney laboratory, in what time
range will the next strong earthquake occur in the region?
(Provide the range by giving the
specific years).
Based on the data and the window forecasted by the scientists at the laboratory the time range
would be between 320-500 years
-
The 1700 earthquake was 315 years ago
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