Tellus-R is a rotational seismometer which was conceived for measuring the rotational ground motion.
Angular velocimeters are highly valued when constructing modern seismic systems which records all six components of mechanical motion.
Tellus-R has high sensitivity for the detection of rotational modes of earthquakes along with a wide dynamic and frequency range. A characteristic feature of the instrument is that it is low noise with a minimal power consumption, which is a significant advantage over electro-mechanical, fiber-optic and other types of rotational motion sensors. Tellus-R comes with a calibration input which allows periodic calibration without the use of expensive dedicated equipment.
Tellus-R comes in a hard coating anodized aluminum housing, IP67 or optionally IP68. It is well suited to harsh environments and is capable of operating at any orientation in space over 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.
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