<p>First announced at EGU2021, and said to be &#8220;released soon&#8221;, the 1C rotation seismometer which complements the blueSeis product line on the high performance segment, will be finally disclosed at EGU2023.</p> <p>2019 and 2020 results have been shared about large mockup of giant Fiber-Optic Gyroscope from iXblue, having diameter as large as 1.2 meters, and the development road to reach an industrial product had been drawn. But several critical additional issues raised on the track.</p> <p>Keeping in mind all the requirement of the instrument, the need for a transportable, and easily deployable instrument, the calibration capability, the possibility to push the performance pilling up the sensors, and the need for an optional orthogonal structure, we finally come to an instrumental solution with high versatility at expected performances.</p> <p>The full development story will be shared, and the tests results of first production units of blueSeis-1C will be disclosed. Explanation about the various way to use it will be offered too.</p> <p>Perspectives and applications using this long-awaited sensor will be presented, from ocean-bottom system tilt denoising to improved inversion of the seismic source.</p>
<p>First results have been already shared about large mockup of giant Fiber-Optic Gyroscope from iXblue, having diameter as large as 1.2 meters, and the development road to reach an industrial product have been drawn.</p><p>Finally it appears that even if an improved performance is always wanted by scientists, a portable instrument remains the first criteria. Therefore blueSeis-1C is the smallest giant FOG achievable to our knowledge with only 400mm diameter. Moreover, it has been made to open various application use, thanks to its particular mechanical design.</p><p>With some delays, the first production units of blueSeis-1C are finally manufactured, and their tests results will be disclosed in this paper, including self-noise at 5nrad/s/VHz, flat on a very broadband from 50Hz to 10<sup>-3</sup>Hz. Scale factor variation in time and in temperature, bias variation in temperature, linearity, magnetic sensitivity, and transfer function results will be presented too.</p>
<p><span>The recent development of rotational sensors of increased sensitivity and portability allowed for co-located 6-axis seismological measurements. This opens new possibilities for the study of seismic records. For example, back-azimuth can be computed with a single station horizontal axis rotations. One of the most promising developments is the ability to remove the projection of the gravitational acceleration on the horizontal translation directions in case of tilting of the sensor assembly, which was formerly indistinguishable from a true acceleration.</span></p><p><span>A 6-C experiment was conducted at a testing facility at iXblue Saint-Germain-en-Laye, France. Different data processing algorithms for tilt removal, as well as a new algorithm developed for this study (whose mathematical basis will be detailed in another submitted abstract) have been applied to this experiment and their results were compared. Contrary to field measurements, tests in laboratory allowed to test edge cases of the different methods.</span></p>
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