Table 1.

Overview of rotational seismometers using indirect measurement (only the most important parameters are listed).

Parameter	Unit	TAPS [55]	Rotaphone
			3DOF [62]	6DOF [62]	D [61]
Frequency range	Hz	7 × 10−1–50 (1),(2)	1–100 (2)	2–60 (2)	2–80 (2)
Sampling frequency	Hz	100	250	250	250
Sensitivity (3)	rad/s	1 × 10−7	1.67 ×10−8	2.16 × 10−9	3.77 × 10−9
Maximum rate	rad/s	1 × 10−1	1 × 10−2	2.87 × 10−1	3.17 × 10−2
Dynamic range	dB	120	100	120	120
Paired sensor spacing	m	0.28	0.30	0.30	0.40
Operating temperature	°C	−10–45	−20–40	−20–40	−40–100 (4)
Weight	kg	15	4.5	9.5	15.3
Dimensions [L × W × H]	mm	450 × 180 × 350	250 (5) × 10	350 × 350 × 430	445 (5) × 112
Sensors: [pcs × type]		2 × SM-3	8 × LF-24	12 × SM-6	16 × SM-6
Natural frequency	Hz	4.5	1	4.5	4.5
A/D converter:	type	Sigma-Delta	2 × AD16021	4 × Tedia	1 × EE & S
dynamic	Bit	26	21	28	24
range	V	±10	±5	±2.5	±1 or ±2.5
GPS receiver and antenna		Stationary system	Garmin GPS 18 (mobile)
Software:	type	Own	Own	Own	Own
output format		miniSEED	RotaCal	RotaCal	RotaCal

⁽¹⁾ Modified according to recorder MK-6 by IG PAS; ⁽²⁾ The instrument generally operates in a high-frequency range (above the natural frequency of the sensors used); ⁽³⁾ Understood as an expression for the smallest signal that can be resolved ([7], p. 79); ⁽⁴⁾ Data for geophone SM-6; ⁽⁵⁾ Disc diameter.