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USGS Professonal Paper 1096 - IRIS

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Appendix 2.--Response curves for commonly used instruments<br />

'l'hese J;espoas@ GllJ;~~eS aJ;e typieal e€ 12effiffiealy used iastJ'woeaE systems. :gsing Ehe<br />

curves and the magnifications found in the station lists, the absolute magnification<br />

curves of some of the instruments can be deduced. rhe curves are normalized at 1 sec for<br />

short-period instruments and 25 sec for long-period instruments. Graphs that can be used<br />

fo~ sGaling aJ'e available fl'em the neE,.'el'k epel'8Eef's.<br />

"<br />

'",<br />

•<br />

ro<br />

1 ... -- . -----<br />

,<br />

/ ~ I f----<br />

. '"<br />

~ f\ .... c V ~ "-<br />

z<br />

7 '\ 1\<br />

~ /'<br />

~<br />

,<br />

03<br />

I: \<br />

s<br />

~ II \ 1\ ! \<br />

,<br />

" \<br />

~ 06<br />

,~<br />

",<br />

'\<br />

!\<br />

\ \<br />

",<br />

"<br />

00<br />

"' '"<br />

\<br />

, • "<br />

~<br />

" ,,, ,,, 6001('00<br />

~ "<br />

PERIOD. IN SECONDS<br />

".<br />

Figure 1.--Response characteristic of the ""' I- -- -- --<br />

curves<br />

1\ I-<br />

standardized WWSSN instrumentation. The shortperiod<br />

curve is plotted to the left of the long- ,m \<br />

period curve.<br />

.00.<br />

,.<br />

00<br />

,<br />

1\<br />

\<br />

\<br />

\<br />

0001<br />

1\<br />

", '00 ". "<br />

00 ,. , , • "<br />

PERleB. 114 9Eee1469<br />

Ej sure 2 --Response CllJ;:¥e chanctedstic<br />

of the Mark L-4C instrument system as<br />

designed by the <strong>USGS</strong>, Menlo Park.<br />

Other short-period instrument systems<br />

sometimes exhibit this same J'@spgns@<br />

363

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