USGS Professonal Paper 1096 - IRIS

MICHIGAN
Ann AtbOl, 11I
GENERAL IKFORMA rr ON
Operated by:
Address:
University of Michigan
Seismological Observatory
Department of Geology ,nd Mineralogy
tJniversiLy of lIichigau
Ann Arbor, M' 48104
Telephone: 313-763-4069
Address to ontaIn records:
A, ahove.
SITE INFORMAT I ON
€ode
Station
italiC
Latitude Longitude Elev Date Date
(deg N. ) (deg W.) (meters) opened closed
~GlHH.I a t iGH; giwlGgic age
AAIl Ann Arbor--------------- 42.2997 83.6561 249 1940 Open-- Gravel.
SUG Sugar Island------------ 46 5214 84.1383 190 9/26/69 5/30/70 Jacobsville Sandstone; Precambrian.
WPM White Plne-------------- 46. 7515 89.5549 193 1973 Open-- Copper Harbor Conglomerate; Precambrian.
INSTRUMENTATION
Seismometer Gal vo Type Magnification
Code Type Component To(sec) T (sec) recording ,t T
g 0
Remarks
AAIl Benioff 1051--------- Z 1 .0 0.75 Photo paper 12.5 K, 6.25 K WWSSN.
Benl0tt 1101 _________ NS ,Ew 1.0 .I'i ---do------ 12 .5 K, 6.23 K Bu.
Sprengnether--------- Z ,NS ,EW 15 .0 100.0 ---do------ 1.5 K Do.
SUG Geotech 7S0SA-------- Z 30 0 100 0 Strip chart 55 K HGLP.
Geotech 1l700C-------- NS,EW 30. 0 100 0 ---do------ 55 K Do.
WPM Benioff-------------- Z 1 .0 --- Helicorder 15 K ---
Geotech 7505A, B700C- Z,NS,EW 30 0 --- He licorder, Z, 17 .5 K HGLP.
magnctic tape. liS. 16 5 K
EW: 16 5 K
ilmlng system: AM uses wwSSN standard. SOG usea , SprengneLner IG-ilO quaIlZ-ctystal ChtOIItHlleLet. 'iifll uses , Beotech T612e.
System response curves: AAM--see figure 3, p. 364. WPM--see figure 6, p. 365.
SHORT HTSTORY
Th, Seismological Observatory ,t Ann Arbor w" es tabl i shed in 1909 ,nd used a Bosch-Omori ,nd , Weichert.
It was located
,t , slightly different location than th, present one. AAM
""
established in 1940 under th, direct_ion of Dc. James T. Wilson.
TiI:Y\'SSN equiplliEnt began opbating at this station on at tober 22, 1962.
SUG began operation th, first surface-installation HGLP prototype station, funded by ARPA. The station was dismantled
following two severe floods. "
WPM was established in th, White Pine Copper Company mine (89 m deep) dud ng 1973 ,nd 1974 with funds provided by ARPA.
First installed
" an experimental station, it w" raised to th, status of th, eleventh HGLP observatory in 1974.
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