Invited by State Key Laboratory of Geodesy and Earth’s Dynamics (SKLGED), professor Herbert F. Wang from University of Wisconsin-Madison visited Institute of Geodesy and Geophysics(IGG) and gave an academic report on title “Distributed Acoustic Sensing (DAS) Field Trials for Near-Surface Geotechnical Properties, Earthquake Seismology, and Mine Monitoring” on May 8.
The report firstly introduced the principle of the Distributed Fiber Acoustic Wave Sensor (DAS). Then he introduced the four DAS field deployment experiments: 90m sensors installed on the frozen lake surface, 762m length in Garner Valley, California, Nevada The geothermal area Brady Hot Springs deploys nearly 9 kilometers of sensors and a 250m array is arranged in the underground limestone mine in Illinois. All kinds of active and passive sources were used in the experiment. The research promoted the application of DAS in shallow surface structure research, traffic monitoring, mine safety, and natural seismology research. In the discussion session, the participates discussed the measurement accuracy of the ground motion recorded by the sensors, the influence of seismic activity around the study area, and other issues in depth. The report achieved good exchange results.
Professor Herbert F. Wang is currently a retired professor of UW-Madison. He received master's and doctoral degrees from Harvard University and MIT. From 1972 to 2017, he was a UW-Madison professor of Earth Sciences. He is mainly engaged in geomechanical research, including petrophysics, elastic mechanics of porous media, and in-situ stress measurements.

                                                                Professor Herbert F. Wang  was giving his report.