Real-time inversion of stress tensor

Programs for stress tensor inversion described in the PRENLAB final report and in PRENLAB-2 first annual report (see Lund and Slunga 1999) have being modified for real-time operation. We utilize the SAG method (Lund and Böðvarsson 2000) to preprocess the data prior to the stress tensor inversion. The preprocessor allows for a stable inversion with minimum amount of data thus gives a new measure of the stress tensor at earliest possible time.