Towards a Transparent Earth. S.D. Glaser, UC, Berkeley W. Roggenthen , SDSMT L.R. Johnson, E.L. Majer , LBNL. Install an acoustic “microscope” surrounding the Homestake workings – 1 st NSF funded DUSEL research. signal. Deep is Quiet, and Quiet is Good. noise.
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S.D. Glaser, UC, Berkeley
W. Roggenthen, SDSMT
L.R. Johnson, E.L. Majer, LBNL
Install an acoustic “microscope” surrounding the Homestake workings – 1st NSF funded DUSEL research
Deep is Quiet, and Quiet is Good
Why at Homestake?
Stress changes at seismogenic depth could be more difficult to observe with conventional surface instruments.
Temperature variation at surface is a large noise source in the electronics.
Deep observation could avoid surface environmental effects, such as precipitation.
Need a deep natural experiment site that bridges laboratory study and large scale seismic experiment.
FenglinNiu Rice University
P. G. Silver, Carnegie Institution of Washington
T. Daley, Lawrence Berkeley National Lab
TOMOGRAPHIC IMAGING OF STRESS-REDISTRIBUTION FOR PREDICTION OF CATASTROPHIC ROCK MASS FAILURE
Stress concentration prior to pillar failure caused by slip along a discontinuity or by overburden stress (in a solid rock mass)
Multiple pillars (of differing dimension) constructed at multiple depths; may include discontinuities
Seismic tomography used to image stress-induced density contrasts within rock mass, allowing stress level to be determined and failure projected
Catastrophic failure extends to all aspects of rock mechanics including tunnels, mines, rock slopes, earthquakes, waste repositories, and bridge and dam abutments
Accomplishing the ultimate goal of predicting these catastrophic failures will result in significantly reduced fatalities, lowered construction costs, and increased environmental protection.
Erik C. Westman , Virginia Tech
Rock failures are associated with the redistribution and concentration of stresses from mine excavations
To predict rock failure, monitor the redistribution of stresses within the rock.
Use tomograms of seismic stress field toimage redistribution of stress
Shown clearly in the laboratory but limited testing at the field scale.
This experiment will enhance miner’s life safety
This experiment will put the method of imaging stress-induced changes within rock masses on a sound theoretical and practical basis. Itrequires a DUSEL, as deep, long-term, dedicated access is not available at current underground tests sites.
Microseismicity sensor network
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Fracto-emission generating fault
Diffusion of electrically neutral gas
FFracto-EM Emissions in Rocks
Dante Fratta, University of Wisconsin-Madison
DUSEL provides unique research opportunity for the development of a new engineering monitoring system based on the complementary interpretation of microseismic and EM emissions in a quiet electrical environment – Homestake mine
Christian D. Klose, Columbia University
Monitoring the Earth's system
from a global perspective.
Classify multi-dimensional and complex data
Interpret & Predict
in areas of interest
- zones of weakness
- seismic events
- zones of fluid migrations
Applied data interpretation methods are based on Artificial Intelligence