USGS Professonal Paper 1096 - IRIS

MONTANA--Continued
lfissoula , Iff
INSTRUMENTATION
Code Type
Sei~mometer Galvo Type Magnification
Remarks
Component T (sec) T (sec) recording ot T
0 0
•
All stations Mark L-4C------------ Z 1.0 0.06 Develocorder 1000 K Magnification ot 10 H,
(approximated) .
1135 Benioff 1651 u ------- Z 1.6 . 75 Photo paper 188 K If\lSSfi.
Benioff 1101--------- NS,EW 1.0 .75 ---do------ 100 K Do.
5prcngncthcr-- --- - - -- Z,NS,EW 15.0 100.0 ---do------ 1.5 K WWSSN. l1agnification of
Z is 3 K
-------.-----.. -.-~---
Timing system: Direct recording of WWB. MSO uses Wi\lSSN Model 8684 (Geotech) transistorized 60-Hz current source controlled
by 0 quartz crystal.
System response curves: I1S0--see figure 1, p. 363. Others--see figure 2, p. 363.
SHORT HISTORY
BB!':!, BCB, BLK, CFM, PN](, SWP, TEE ond WCM belonged to the Libby Dom array. They were originally funded by the USGS .nd
later by the U S. A=y Corps of Engineers. The Corps now maintains its own small array in the area.
C,,", GBM, HLI1, LEM, LFM, DIM, WAM, and YCM belonged to the Helena-Ovando array.
funoeo by the 1:15(;S.
lisa '"
equ~ppea: w~tfj ~nstrumenEs from Die oIa: W'W'SSN sEaElon 0' Bozeman (BOZ) ana
"
190