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Rotation as a new observable in seismology

When the ground shakes, it not only translates (up-down, sideways) but also undergoes rotational motions (yaw, pitch and roll). To fully characterize seismic sources and wave fields, it is necessary to measure both the translational and rotational movements of the ground.
However, until now, this was not possible simply, locally and directly. Long-awaited by seismologists throughout the world, blueSeis’ new sensors truly revolutionize the seismology market by allowing a complete measurement of a seismic wave.

Frédéric Guattari, Head of blueSeis product line

 

About iXblue

iXblue, an international high technology company with a unique expertise

iXblue stands as a global leader in the design and manufacturing of innovative solutions for navigation, positioning, geophysical and acoustic imaging markets. The French Group offers its unique advanced technology solutions to its defense & civil customers to address increased challenges and carry out their maritime, land and space operations with optimum efficiency and safety.

 

inertial & sensors systems

iXblue is recognized throughout the industry for its pioneering work on the development of fiber-optic gyroscope (FOG) technology which has revolutionized the maritime and naval inertial systems in the last decade, providing unequalled performance and cost of ownership benefits. Underpinned by 30 years of expertise, iXblue is currently achieving annual growth of 15–20%, with 80% of its business conducted in over 35 countries worldwide. The Group can count on full value-chain expertise: all of its systems are developed internally, from design to manufacturing.

iXblue, between seas and space​

The unique technologies developed by iXblue have found a variety of fields of application, continuously opening up new opportunities for innovation. Through a series of scientific breakthroughs, iXblue has forged a unique identity to become a group with global reach and multiple areas of innovative know-how.​

iXblue technology is at work everywhere from the ocean depths - 11,000 meters under the sea – to outer space - some 1.5 million kilometers above the Earth.

About

blueSeis

blueSeis, a revolution in the history of geosciences

Through its blueSeis product line, iXblue offers to the seismology market, unique and reliable solutions that are pushing back the boundaries and opening up a broad field of possibilities. With blueSeis, iXblue now gives to geosciences the possibility to explore rotational ground motions.

 

 
 
 

Products

Portable, 3-component rotational seismometer

Performance

  • Broadband (DC to 50 Hz)

  • Low noise (< 20 nrad/s/√Hz from 0.01 to 50 Hz)

  • High dynamic range 0.5 rad/s

Plug & Play

  • Easy to deploy

  • No calibration needed

  • Maintenance-free

  • Digital technology

  • GNSS time stamping

  • miniSEED format

  • Web interface

  • DC absolute rotation rate

Benefits

  • No translational sensitivity

  • Negligible cross coupling (< 60 dB)

  • North finding function

blueSeis-3A

1-component
rotational seismometer

Performance

  • Very wide broadband (DC to 200 Hz)

  • Extremely low noise (5 nrad/s/√Hz from 0.001 to 200 Hz)

  • Cold sensor head: < 1 mW dissipated in sensor head

  • ø: 40 cm

  • High dynamic range 0.1 rad/s

 

Key features & Benefits

  • Industrial field-proven product

  • Attractive price/performance ratio

  • Mountable & removable

  • 2 electric box options:

- For 1 sensor: 4 W

- For up to 3 sensors: 6 W

 

(Preliminary specifications)

blueSeis-1C

Fiber-Optic Gyrocompass (FOG) and attitude reference system

for True North seismometer alignment

To guarantee high precision and reliability of seismologists’ measures, it is crucial to make sure that rotation and translation sensors are perfectly aligned. 

iXblue’s Quadrans is a guarantee for a perfect alignment of sensors.

It is a prerequisite for trustworthy 6-axis seismology measurements, extremely precise analysis of polarization of seismic waves, and reliable signal-to-noise ratio for array derivated rotation measurement.

Quadrans

 
 
 
 

Field missions

blueSeis in the field: applications and missions

The blueSeis’ team conducts many evaluation missions, over the world in collaboration with partners, to demonstrate the blueSeis’s measurement capabilities on seismology and volcanology, ground tomography, infrastructure monitoring and so on.

 

 

Events

Join us at...

Past events

"Recent hydrological variability of the Moroccan Middle-Atlas Mountains inferred from micro-scale sedimentological and geochemical analyses of lake sediments" - Guillaume Jouve, Laurence Vidal, Rachid Adallal, Ali Rhoujjati, Abdelfattah benkaddour, Emmanuel Chapron, Kazuyo Tachikawa, Edouard Bard, Thierry Courp, Laurent Dezileau, Bertil Hebert, William Rapuc, Anaëlle Simonneau, Corinne Sonzogni, and Florence Sylvestre

"Applying laser reflectometry to study active submarine faults: the FOCUS project (FOCUS = Fiber Optic Cable Use for Seafloor studies of earthquake hazard and deformation)" - Marc-Andre Gutscher, Jean-Yves Royer, David Graindorge, Shane Murphy, Frauke Klingelhoefer, Chastity Aiken, Antonio Cattaneo, Giovanni Barreca, Lionel Quetel, Giorgio Riccobene, Florian Petersen, Morelia Urlaub, Sebastian Krastel, Felix Gross, Heidrun Kopp, Milena Moretti, and Laura Berenzoli

"Seismic point and kinematic source solutions from rotational ground motion" - Stefanie Donner, Moritz Bernauer, Michael Reinwald, Céline Hadziioannou, Babak Hejrani, Marija Mustac, Hrvoje Tkalcic, and Heiner Igel

"Toward a study of the effect of rotational motions on linear seismic measurements" - Damien Ponceau, Frederic Guattari, Franck Larsonnier, Serge Olivier, Anne-Sophie Morlens, Olivier Sebe, and Theo Laudat

"Discriminating transient long period deformation signal from permanent rotation on a portable rotation sensor" - Coralie Aubert, Olivier Coutant, frederic Guattari, and théo laudat

"GiantFOG development leads to new commercially available sensor : blueSeis_1C" - Frédéric Guattari, Theo Laudat, Elliot De Toldi, Camille Roudier, Olivier Mannessier, and Olivier Jolly

"Positioning and rate table as a tool to characterize the broadband transfer function of rotational sensors" - Theo Laudat, Felix Bernauer, Damien Ponceau, Frederic Guattari, Joachim Wassermann, and Heiner Igel

"Demonstration of a robust hybrid classical/quantum accelerometer" - Pierrick Cheiney, Brynle Barrett, Simon Templier, Baptiste Battelier, Philippe Bouyer, Henri Porte, and Fabien Napolitano

"Deploying a subsea network to monitor continental drift" - Hubert Pelletier

"Dynamic tilt correction with direct measurements of rotation" - Felix Bernauer, Joachim Wassermann, and Heiner Igel

"Rotation in building including soil-structure interaction" - Philippe Guéguen, Frédéric Guattari, and Thomas Laudat

"Innovative ground motion sensors for planets and asteroids: PIONEERS H2020-SPACE european project" - Saloomeh Shariati, Frederic Guattari, Jean-Jacques Bonnefois, Raphaël Garcia, David Mimoun, Joachim Wassermann, Felix Bernauer, Heiner Igel, Sebastien de Raucourt, Philippe Lognonné, Ozgur Karatekin, Birgit Ritter, Veronique Dehant, Cedric Schmelzbach, Domenico Giardini, and Luigi Ferraioli

"6C ground motion observations on volcanoes: opportunities, experiments, observations
J. Wassermann, H. Igel, F. Guattari, C.J. Bean, K.L. Li, M. Möllhoff, A. Bell, M. Ruiz, J. McCloskey

"Fiber Optic Gyroscope Road-Map for Highest Rotational Ground Motion Sensitivity on the Field
Frédéric Guattari, Elliot de Toldi, Alexandre Bigueur, Felix Bernaeur, Joachim Wassermann, André Gebaeur and Ulrich Schreiber

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Bibliography

we have gathered the various papers that we believe will provide a more detailed information about the iXblue technology, and about the tremendous application of the blueSeis3A rotational seismometer

 

Contact us

For any queries, please do not hesitate to contact our blueSeis teams. We will be happy to discuss your application and specific needs so that we can offer you the blueSeis solution that perfectly fits your requirements.

Mail: blueseis@ixblue.com

Tel: +33 1 30 08 88 88
Cell: +33 6 64 30 39 94

iXblue - blueSeis
34 rue de la croix de fer
F-78100
Saint Germain en Laye - 
France

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