We summarize Underground Research Laboratories (URLs) in hard rock with varying degree of fracturing, in soft rock with plastic deformation, in shallow and in deep laboratories for physics and multidisciplinary research. URL studies range from underground injection assessment, search for origins of life, heterogeneity and fracture network characterizations, coupled process testing, quantification of induced deformation and seismicity potential, to coupling of underground signals to atmospheric and ionospheric processes. Common and new approaches can be developed through exchanges to address fundamental challenges and practical aspects of organization, procedure, and incentive needed to formulate and develop URL networks and innovations.

This content is only available via PDF.
You can access this article if you purchase or spend a download.