FBV INYO specifications
The instrument's high-gain output has a sensitivity of approximately 315 V/cm/sec (31,462 V/m/sec) over a frequency range of 50 seconds to 30 Hz, while the low gain output is 6.29 V/cm/sec (629 V/m/sec) over the same bandwidth. Both outputs clip at a level of 10 Volts, which represents 318μm/sec for the high gain channel and 1.59cm/sec for the low gain one.
High gain channel
354nm/sec/line WinSDR Y-scale factor = 1 50sec – 12.5sec (0.08Hz) Clipping level 318μm/sec.
These settings greatly reduce microseisms and cultural noise although they also eliminate higher-frequency local quakes and may mask some phases of teleseisms. However the sensitivity is sufficient to occasionaly display surface waves originating from distant quakes having magnitudes in the high 4's, low 5's. Large quakes will be off screen, although the channel clipping level (10V out) is still 318μm/sec. or 36x this screen height.
Low gain channel
17.7μm/sec/line WinSDR Y-scale factor = 1 50sec – 10Hz Clipping level 1.59 cm/sec
These settings clearly show some cultural noise, which tends to get smaller at night. Higher-frequency local quakes show up well on this display and large teleseisms are also well displayed.
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