Seismic Research Observatories (SRO)
Seismic Research Observatories (SRO) : Name and acronym of a former global U.S. seismic network, operating between 1974 and 1993. The longperiod SRO responses were very specific: a narrow 20 s bandpass with a 6 s noise notch-filter (see in Chapter 11 of this Manual Fig. 11.27 ??? and Tab. 11.3 ??? for the poles and zeros). Many record examples, in comparison with those from other seismographs, are given in Chapter 11, DS 11.2 and 11.3 of this Manual. The SRO-LP response has advantages for measuring the IASPEI standard Ms_20 magnitude. See Chapter 3 and IS 3.3 of this Manual and Hutt et al. (2002)
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