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SEISMOMETERS

ROTATIONAL SEISMOMETER

Tellus R is the basis used for constructing the most modern seismic systems, recording all 6 components of mechanical motion.
It has a high level of sensitivity for the detection of rotational modes of earthquakes, wide dynamic and frequency ranges.
A characteristic feature of Tellus R is low noise with minimal power consumption, which is a significant advantage over electro-mechanical, fiber-optic and other types of rotational motion sensors. This device has a calibration input, which allows the user to perform periodic calibration without the use of specialized equipment. The device is able to operate in any position in a wide range of temperatures.

Rotational Seismology is an emerging study of all aspects of rotational motions induced by earthquakes, explosions and ambient vibrations.

To describe the situation during vibration generated by an earthquake, the general motion of particles or a small volume in a solid body, can be divided into three parts: translation (along the x, y, and z axes), rotation (about the x, y, and z axes), and strain (e.g. Båth, 1979; Teisseyre et al., 2006).

Rotational ground motion has been ignored for centuries due to a widespread belief that rotation is insignificant in measuring, recently however it has come to be believed that rotational signals may contain additional valuable information for studying wave propagation; in addition, rotational ground motion may be important in the excitations of certain engineering structures.

According to the introduction of a special issue of the Bulletin of the Seismological Society of America, rotational seismology has become an emerging field for the study of all aspects of rotational ground motion induced by earthquakes, explosions, and ambient vibrations. This domain has attracted the attention of researchers and structural engineers from a wide range of geophysical disciplines.

A complete seismic station

​You can build your complete seismic station using a 9-channels ATLAS and get information from the force balance accelerometer (LTFB160), the very broad band velocimeter (Tellus FS) and the rotational sensor (Tellus R)

Channel XYZ Rotational
Resolution 6*10-8 rad/s at 1 Hz
Output Signal +/- 20 V differential, 0.4 rad/s
Dynamic Range 117dB
Selfnoise PSD -125dB (rel. 1 rad/s2/√Hz)
Frequency range 0.033 – 50 Hz (opt. 0.01 – 100 Hz)
Generator Constant 50 V/rad/s
Mass Centering none
Installation Angle any
Calibration Input 1:1
Power Supply 10-18 Volt DC
Power Consumption 30 mA
Dimension 180mm OD Height 140mm
Weight 2Kg
Op temp -15 to + 55 C (opt. -40 to + 55 C)
Protection IP68
Compliance CE
Housing Anodized Aluminium
Cable 3m standard or custom
Connector PT06E-14-19P(SR)
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