Publications by authors named "Yingcai Zheng"
Article Synopsis
- Monitoring the geology around a borehole (a hole drilled into the ground) is important for energy and environmental projects, but traditional methods can't work in very hot places or for long-term checks.
- A new method called source-free distributed-acoustic-sensing (DAS) uses natural sounds in the environment instead of needing extra equipment, making it easier to use in tough conditions.
- This new DAS tool shows promise for better understanding underground rock properties and could be used more widely in high-temperature areas like geothermal energy sites if further tests are successful.
Recent development on the Green's function retrieval by wavefield crosscorrelation has substantially advanced the physical research in a multidisciplinary and unprecedented fashion. However, the underlying assumption of the theory that the sources are in the far-field limits the technology to extracting only the high-frequency part of the Green's function in an open system. This critical approximation can be eliminated using the exact boundary integral equation method.
View Article and Find Full Text PDFSubduction zones play critical roles in the recycling of oceanic lithosphere and the generation of continental crust. Seismic imaging can reveal structures associated with key dynamic processes occurring in the upper-mantle wedge above the sinking oceanic slab. Three-dimensional images of reflecting interfaces throughout the upper-mantle wedge above the subducting Tonga slab were obtained by migration of teleseismic recordings of underside P- and S-wave reflections.
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