Thursday Seminar - Integrating fiber-optic instrumentation in geohazards monitoring and geophysical inference [SEC=OFFICIAL]
Trevor Allen
Dear colleagues – this ANU seminar might be of interest to some, particularly for geotechnical and dam engineering applications.
Cheers,
Trev
From: Rses.all <rses.all...@anu.edu.au> on behalf of RSES Seminar Convenor <seminar.co...@anu.edu.au>
Date: Wednesday, 1 May 2024 at 12:54 pm
To: 'RSES All' <rses...@anu.edu.au>,
rses....@anu.edu.au <rses....@anu.edu.au>
Subject: [Rses.all] Thursday seminar invitation (9.05)
Dear All,
We are pleased to announce the next RSES seminar guest speaker will be Dr Jan Dettmer from the University of Calgary, who will present the talk: "Integrating fiber-optic instrumentation in geohazards monitoring and geophysical inference"
The lecture will be held in J1 Seminar Room, as well as via Zoom next Thursday May 9th, at 3pm.
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Integrating fiber-optic instrumentation in geohazards monitoring and geophysical inference"
Dr Jan Dettmer, Department of Earth, Energy, and Environment, University of Calgary (jan.d...@ucalgary.ca)
Thursday 9th of May at 3pm
Zoom ( 606 666 0101 | password: jaeger)
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Abstract
Geophysical methods have a long history of contributing to the monitoring of geohazards such as earthquakes, landslides, and the failure of built structures. Geotechnical instrumentation is often limited to measurements at points in space, such as boreholes. Geophysical methods complement such information with inferences about the spatial and temporal distribution of subsurface properties. A common hindrance for geophysical monitoring is that individual geophysical data types cannot uniquely determine Earth properties. Improvements in spatial/temporal sampling of geophysical data and advanced inference methods can address some of these limitations. Fibre-optic sensing is a disruptive technology that measures strain with high spatial sampling and over extremely broad frequency ranges along optical fibres. Several examples of these data illustrate the potential for exciting new discoveries but also include some limitations. For landslides, the high spatial sampling and resolution of low frequencies illuminates transient strains that propagate through a slope at minute scales and millimeter displacements. Tailings dams are large built structures that impound mine waste. Instrumenting these dams with fibre provides long-term, in-situ monitoring of geomechanical properties along entire dams and avoids costs associated with other seismic sensors. The high spatial resolution of fibre-optic sensors is also of advantage to the monitoring of small seismic events. However, the axial symmetry of the sensor causes limitations in volcanic environments and for the monitoring of induced earthquakes. Finally, fibre-optic sensing can reduce the uncertainty of subsurface elastic properties in inversion which is important for carbon-capture and storage applications.
Kind regards,
RSES Seminar convenors
PS
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