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USGS Professonal Paper 1096 - IRIS

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ILLINOIS<br />

Chicago<br />

IT<br />

GENERAL INFORMATION<br />

Operated by:<br />

Address:<br />

U S. Weather Bureau and<br />

the University of Chicago<br />

University of Chicago<br />

Chi cago II 60637<br />

Address to obtain records:<br />

SITE INFORMATION<br />

National Geophysical and Solar-Terrestrial Data Center<br />

NOAA/EoS D6Z<br />

Boulder, CO 80302<br />

Code<br />

Station name<br />

Latitude<br />

(deg N.)<br />

Longitude<br />

(deg W.)<br />

Elev<br />

(meters)<br />

Date<br />

opened<br />

Date<br />

closed<br />

Foundation; geologic age<br />

CHK<br />

Chicago-----------------<br />

41.7889<br />

87.5992<br />

180 1918<br />

1967<br />

Niagara Limestone; Middle Silurian.<br />

INSTRUMENTATION<br />

--------<br />

Seismometer<br />

Code Type Component<br />

Galva<br />

T<br />

,(sec)<br />

Type<br />

recording<br />

Magni ficatlon<br />

"T o<br />

Remarks<br />

CHK McComb-Romberg------- NS,EW<br />

10.0<br />

Photo paper<br />

330<br />

Timing system:<br />

Seth Thomas clock.<br />

System resp9Hse ~IJ.F es: Net a ailasle.<br />

SHORT HISTORY<br />

CHK was established by the U.S. Weather Bureau and the University of Chicago in cooperation with the USC&GS. The original<br />

cquiplacllt cOhsisted of a two componcnt llilnc Shaw seismoll1cLcr aild .. as located iii the haSCiLCill of ROSEnwald Hall o£ dIe HHioct'sit).<br />

The above-mentioned equipmcnt was installed in 1939.<br />

145

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