USGS Professonal Paper 1096 - IRIS

Basalt,
WASHINGTON
Berkeley, CA
GENERAL INFORMATION
Operated by:
,\ddress.
Tera CorporOition for
Portland GenerOil Electric CompOiny
'feu Gorpor!lt:i:on
2118 l1ilvia Street
Berkeley, CA 94704
Telephone: 415-845-5200
Address to obtain records:
SITE INFORHATION
StllOirt W Smj tb
Geophysics Program
202 ATG Building, AK-SO
University of Washington
Seattle, WA 98195
Goae
StaHen ftame
Latitude Longitude Elev Date Date
(deg N. ) (deg W. ) (meters) opened closed
E r;nuuh t i O;lIl ; g@Qlog;i1:;
age
ALD Alter kLoge------------- 45. 8194 12u.uM) 427 I II ('j 5pell
n
[liocEne.
RPK Roosevelt--------------- 45 .7617 120.2306 549 11/75 --do-- Basalt; Miocene.
INSTRJJMENTATION
Seismometer Galvo Type Magnification
Code Type Component To(sec) Tg(sec) recording .t T 0
- - - -
..
Remarks
ALD Mark L-4C------------ Z 1.0 --- Helicorder Variable Gain adjusted seasonally.
Telemetf'red to Arlington,
OR.
RPK --do----------------- Z 1.0 --- --do------ --do---- Do.
Timing system:
System response curves:
SHORT HISTORY
Sprengnether clock checked with WIN" daily.
Curves slightly different from standard Mark L-4C microseismic system (fig. 2) ; peak .t 5 Hz.
The stations ore in .n arf'a where no other seismometers exist .nd where seismicity i, low. Portland General i,
interested in being able to precisely locate occasional earthquakes when they do occur.
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