Final technical report

Rial, J.A. ; Lees, J.

J.A. Rial/University of North Carolina at Chapel Hill

关键词: Orientation;    Fractures;    Testing;    Geothermal Fields;    Iceland;   

DOI  :  10.2172/982094
RP-ID  :  FINAL TECHNICAL REPORT
RP-ID  :  FG36-04GO14290
RP-ID  :  982094

美国|英语

来源: UNT Digital Library

【 摘 要 】

As proposed, the main effort in this project is the development of software capable ofperforming real-time monitoring of micro-seismic activity recorded by an array ofsensors deployed around an EGS. The main milestones are defined by the development ofsoftware to perform the following tasks:• Real-time micro-earthquake detection and location• Real-time detection of shear-wave splitting• Delayed-time inversion of shear-wave splittingThese algorithms, which are discussed in detail in this report, make possible theautomatic and real-time monitoring of subsurface fracture systems in geothermal fieldsfrom data collected by an array of seismic sensors. Shear wave splitting (SWS) isparameterized in terms of the polarization of the fast shear wave and the time delaybetween the fast and slow shear waves, which are automatically measured and stored.The measured parameters are then combined with previously measured SWS parametersat the same station and used to invert for the orientation (strike and dip) and intensity ofcracks under that station.In addition, this grant allowed the collection of seismic data from several geothermalregions in the US (Coso) and Iceland (Hengill) to use in the development and testing ofthe software.