USGS Professonal Paper 1096 - IRIS

WYOMING--Continued
Ilenlo Park, EA
INSTRUMENTATION
Seismomet.er Galvo Type Magnification
Code Type Component To(sec) Tg(sec) recording
" T ,
Remarks
(CJ), (W), EV-17----------- z 1.25 Photo paper
CJW, NJW,
(¥PEE), (fl'lle) ,
(YPPC), (YPPR) I
(YFSE) , (YPSG) ,
(ypIe)' Hark T4_Cnn ___ z 1 0 Develororder
-,
MIlS, Lehner-Griffith- Z,NS,EW 1.25 --do--------
HJW, MVW,
(Yl'I.K) ,
(YPHL) , (YPNB) ,
(YPOF) : Mark L4-C------- Z,NS 1.0 --do--------
Timing system:
WWVB recorded directly with a custom-chronometer backup.
System response cllrves' See figure 2 p 363 for short-period yertjcal jnstruments.
SHORT HISTORY
ClW operated for about one year (1964-65) at a slightly different locations than the current CJW site.
MHS and MIW have operated jntermittently sinCe thejr jnstallatjon
MVW has been located in two different locations but less than 1 km apart.
IDA, Idaho Array (43.7867 0 N., 113.0225 0 W., elevation l'j24 m), was one of six stations run on a part-time basis; they were
telemetered to Menlo Park after working hours and recorded on Develocorder. This array ran from December 1968 to August 1969.
Many of these stations have also been recorded on magnetic tape at various times, and these records are also available.
Short-term networks in the area of Yellowstone National Park have been established for special studies:
June 3D-July 19, 1975: A 20-element array of short-period vertical instruments recorded on photo paper. Code names
begin with YA, YD. and YL.
August 20-0ctober 20, 1965:
magnetic tape.
Five short-period vertical instruments rotated between nine locations and recorded on
Older data (before 1972) may Dot he