Distributed Fiber-Optic Seismology in Theory and in Practice, AGU 2018 Tutorial скачать в хорошем качестве

Distributed Fiber-Optic Seismology in Theory and in Practice, AGU 2018 Tutorial

This is the same material presented in a tutorial talk at the 2018 AGU Fall Meeting by Eileen Martin and Nate Lindsey. Over the past decade, fiber-optic Distributed Acoustic Sensing (DAS) has become increasingly common in energy applications as a low-cost-per-sensor option for dense, permanent seismic monitoring. Researchers are beginning to explore how DAS could be used to solve basic and applied science questions, including problems related to earthquake detection, location and early warning, near surface geotechnics and infrastructure, hydrogeology and cryosphere. However, presently there is a lack of review papers or tutorials with specific-enough information for new users getting started with DAS. We aim to fill this gap, addressing the following questions: When and how is DAS advantageous? What are the limitations? Quantitatively, what is being measured? How do recording settings affect data fidelity at each frequency? What are existing methods for installing downhole and surface arrays, and what are their cost and quality tradeoffs? How do active source and earthquake recordings compare to seismometers? What signal is extracted from ambient noise interferometry of DAS data? This tutorial aims to enable more scientists to ask whether their applications might benefit from this type of dense, permanent seismic monitoring.