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streat last Thursday. No ane was injured.

was hurt.

TERRACE FIREFIGHTERS clean up after ox-
tinguishing a fire accidentally started on Kalum

Kids start fire

TWO CHILDREN accidentally set their home on
fire this past Thursday October 9 at a townhouse
on 3506 Kalum. They were playing with a lighter
in their upstairs bedroom when a bed was ignited.
Deputy Fire Chief Rick Owens says the mother
of the two children woke up to discover the up-
stairs portion of the house smothered in smoke.
No smoke detectors were found on the premises.
Fortunately the upstairs window broke and dis-
sipated the heat, making it easier to extinguish the
fire. The fire was put out in 10 minutes and no one

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4710 Keith Ave. ¢ 635-7767

Tne Terrace Standard, Wednesday, October 15, 1997 - A7

Explosives used
to blast the earth
and unravel puzzle

SCIENTISTS ARE breaking new ground in
the earth’s inner core. And they came to the
northwest to do it.

For the last 13 years, hundreds of geos-
cientists across Canada have been probing
beneath the earth’s surface in an attempt to
get to the botiom of our country’s founda-
tion. ,

Earlier this summer they were concentrat-
ing in the area just north of Terrace —- from
Stewart and north cast to Watson Lake.

“We are trying to unravel the jigsaw
puzzle that is Canadian geography,”’ said
Ron Clowes, director of the Lithoprobe
project and geophysics professor at the
earth and ocean sciences department at
UBC.

The Lithoprobe project studies the growth
of the continent from it’s earliest begin-
nings, about 4,000 million years ago, by
using key areas across the country that
represent this geological jigsaw.

The study in this area, which includes
three primary corridors (between the Great
Slave Lake region and the Pacific Coast), is
the final one in the overall study.

This is the only place on carth that geos-
cientists can investigate 4,000 million years
of the earth’s history, said Clowes.

This area is unique because the rock
record spans 90 per cent of earth’s history
— dating from about 4000 million years to
the relatively young formations the oc-
curred between 1500 to 500 million years
(that’s young when you consider the fact
that the earth is about 4.6 billion years old),

Some of the rock west of the mountain
belt (which was under water until about 400
miliion years ago) is known as exotic ter-
rain — having formed away from North
America and attached to the continent
through the process of plate tectonics.

Measuring the earth’s lithosphere — the
upper rigid 100-250 km of the planet — re-
quires a multi-disciplinary amalgamation.

But the primary method that drew about

65 people to descend on the earth’s surface
this past summer involved detonaling a
series of explosives.

Called the Seismic Refraction Method,
scientists use extremely sensitive instru-
ments to measure and record the sound
waves that travel from the surface of the
earth to about 100 km deep and then up
again, and travelling about 600 km sway
from the source.

Scientists, technicians and over 600 in-
struments set up shot points for detonating
explosives that stretched from Stewart to
Watson Lake.

This area is unique because the
rock record spans 90 per cent of
earth’s history — dating from
about 4000 million years to the rel-
atively young formations the oc-
curred between 1500 to 500 million
years.

"We used explosive charges put into 180
feet deep holes — charges ranged from
1000 to 3000 kg of explosives,’’ explained
Clowes,

Instruments detected the ground motion
aud digitally clocked the energy, recording
it in a similar way as seismic wiggles, he
added. “‘The next step is interpreting the
speed in which sound propagates in dif-
ferent types of rocks,’’

Sound travels at different velocities in
different rock minerals, and geoscientists
have to interpret the information to draw up
a crude map of the earth’s lithosphere.

The process of interpreting the informa-
tion will probably take two to three ycars, a
short time considering the massive frame of
time they are working with.

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A STRONG COMMUNITY

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voice.

Stength through a shared vision
for Terrace's future.

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