Subject: visualize Resent-Date: Thu, 23 Dec 1999 10:51:36 -0500 Resent-From: Geoffrey Fox Resent-To: p_gcf@npac.syr.edu Date: Thu, 23 Dec 1999 07:50:43 -0800 From: "Kenneth J. Hurst" To: Geoffrey Fox CC: andrea@cobra.jpl.nasa.gov, John Rundle Geoffrey- Some help with the visualization stuff: The need for 3-D visualiaztion capability is self-evident when the nature of the GEM problem is considered. It is inherently a 4-dimensional problem with both space and time dependencies. An example of how 3-D visualization might have helped avoid a potential dust-up comes from the Hector Mine earthquake this past October 16, 1999: One of the first questions everyone had about the HM quake was "how is it related to the 1992 Landers quake - does the stress shadow model apply here as it has in other earthquake sequences?" Initial models indicated that yes indeed the HM earthquake occured in an area brought closer to failure by the Landers event. However, on closer examination it was discovered that *at the depth of the hpocenter*, the Landers quake had brought the area of the Hector Mine earthquake *farther* from failure. Had the data been explored using 3-D visualization methods, this mistake would probably not have been made in the initial interpretation. Ken Hurst Mail Stop 238-600 voice: 818-354-6637 Jet Propulsion Lab / Caltech FAX: 818-393-4965 Pasadena, CA 91109 hurst@cobra.jpl.nasa.gov