California quake shook up Oregon
Instrument feels
distant quakes
By Christopher Blair
Emorald Editor
Thf ground was slinking in
bugene and till overOregon on
Juni’ but it's doubtful any
une in the area lull it
()n tii.il diiv, iiinrr thrih 1.000
mill’s to thf south, .in earth
quake rorkrd thu suburbs oust,
ol l.os Angeles, killing two pen
pin, injuring 70 nhcl causing
sio million worth of damage
dene Humphreys, a llniversi
tv geology profussor, said this
I'.irlliquiiko. Iikr all others sunt
waves of energy through tliu
iiarlli and .iround its surface, es
sentiallv ringing tin: planet like
a bell
•■Anytime anything five-arid
,i-half (on the Richter scale)
goes off anywhere in the world,
we'll get it quite clearly, Hum
phreys said
"The whole world moved as
a result of this earthquake
There's a worldwide network
ol seismometers, and they all
saw this earthquake. It was the
biggest one for the week, proha
blv "
A University-owned see
mometer in Eastern Oregon,
which records ground motion
using a system ol suspended
weights, detected disturbances
from the June 2H earthquake
soon alter it happened
Although the energy record
ed at the seismometer's Pine
Mountain site was less than
that of someone walking on the
ground nearby, Humphreys
said the seismometer's data is
important in studying earth
quakes, their idler ts and the
structure ol the earth
The earthquake in (.alifornta
University Geology Professor Gene Humphreys plans to use these
seismometer recordings, picked up in Oregon June 28, ns an aid in
his classes
measured about fi t) on the
Rich tor si ,1 lc, vv h i c h r .11 t'S
quakes according to their
strength A magnitude ii run
cause severe damage in a popti
lated area, as was the case in
Southern California
Humphreys said every in
crease in number on the scale,
say. from T> to ii. means the
earthquake is JO times more
powerful Likewise, a magni
tude 7 quake would he 400
times more powerful than a 5
Tremors of f> r> magnitude
happen almost daily some
where in the world, he said,
and 0 quakes 01 i ur about
once a week Most of these
earthquakes happen under the
sea or in remote areas ol the
earth, and as a result, are randy
noticed until one occurs in or
near a populated area
The landscape in Southern
California is criss-crossed with
a system of faults, the result ol
two giant sections ol the earth's
crust moving past eai h other
As the sections move dong the
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I,mils, Ihi'V get stui k ami in hi
tu.illy slip, releasing energy awl
musing ,m earthquake
On p.ipur, the seismometer
displays tfm earthquake ,is ,i
jagged lino Tin' Iini'. from lull
tu right, starts out as flat, then
begins tu move up and down in
peaks and valleys about an
eighth ol an ini h high
Humphreys said this area ol
the gr a p h ruprnson t s the
i ompressional or p wave, tin
energy from the earthquake that
moved toward (tregon dire, 11 v
through the earth As the slow
er shear or s waive hits, the
peaks and valleys move i,loser
together and grow to be an inch
high on the graph
He demonstrated the difler
eiue between the two waves
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