Delivered-To: igsmail@igscb.jpl.nasa.gov Message-Id: Date: Fri, 13 Feb 2004 13:11:12 -0500 To: IGS Mail , CANSPACE From: Mike Craymer Subject: [IGSMAIL-4840]: AGU/CGU Special Session G08 Stable North America-Fixed Reference Frame Sender: owner-igsmail Precedence: bulk ****************************************************************************** IGS Electronic Mail 13 Feb 10:11:43 PST 2004 Message Number 4840 ****************************************************************************** Author: Geoff Blewitt, Michael Craymer and William Holt Dear IGS/CANSPACE Colleagues: We invite you to consider contributing to the special session G08 "Towards a= Stable North America-Fixed Reference Frame" at the AGU/CGU/SEG Joint= Assembly in Montreal, May 17-21. 2004. This session will address the pressing needs for a North America-fixed= reference frame that is stable at the sub-millimeter level, and what is= involved in defining a frame with such stability. Velocity solutions from= GPS networks covering the North America-Pacific plate boundary (including= the Plate Boundary Observatory under construction) are most naturally= expressed with respect to the stable interiors of either the North America= or Pacific plates. As well as providing a common frame by which to compare= results from different analysis groups, such a system makes it easier to= interpret the data in terms of where the total budget of relative plate= motion is accommodated, and how deep plate boundary dynamics penetrate into= the plate interior. Defining a stable frame at the sub-millimeter level= requires adequate characterization of kinematics at that level across a= sufficiently broad expanse of what may be termed the "plate interior,"= which deforms due to PGR and other mantle processes, coupled with= lithospheric heterogeneity. A dynamically defined velocity datum (as= opposed to a purely kinematic choice) is preferable to add interpretive= value to site velocities. We solicit presentations addressing any aspect of= what is required to realize a N.A. frame with such stability, including= required observations (old and new, geodetic and otherwise), kinematic= characterization, dynamic models, possible inferences from seismic= anisotropy, reference frame theory, and also on limiting factors that will= likely control the level of stability that might be achieved in the= foreseeable future. The deadline for on-line abstracts is 19 Feb 2004, 23:59 UT. For further= details go to . Conveners: Geoffrey Blewitt University of Nevada, Reno 1664 N. Virginia Street Mail Stop 178 Reno, NV89557USA 1-775-784-6691 gblewitt@unr.edu Michael Craymer Natural Resources Canada, Geodetic Survey Division 615 Booth Street, Room 493 Ottawa, ONK1A OE9CAN 1-613-947-1829 craymer@nrcan.gc.ca William Holt State University of New York at Stony Brook Department of Geosciences Stony Brook, NY11794-2100USA 1-631-632-8215 wholt@mantle.geo.sunysb.edu