Date: February 5, 1998

To: Invited Participants

From: Mike Ritzwoller (CU) and Bill Walter (LLNL)

Re: WORKSHOP ON THE U.S.USE OF SURFACE WAVES IN MONITORING THE CTBT 
	(Date: All day Thursday March 19 and the morning of 
	Friday 20, 1998. Right after the SSA meeting in Boulder.
	Location: University of Colorado, Boulder. Information
	about workshop location and accommodations will be sent 
	in the next circular.)


	You are invited to participate in a workshop on seismic Surface
Waves in Monitoring the CTBT to be held on March 19 and 20, 1998 at the
University of Colorado at Boulder. The purpose of the Workshop will be 
to help focus and to coordinate basic and applied surface wave research
of relevance to CTBT monitoring. The aim is to bring representatives 
from the USGS, DOE labs, AFTAC, and DSWA together with academics and 
consultants to discuss the present and future practice of surface wave 
seismology. The model and motivation for the Workshop is the very 
successful USGS/DOE Location Workshop that was held in Golden in 
November, 1997.

	The goals of the Workshop are as follows.

1) To apprise participants of current research and plans in order to
   facilitate information exchange, collaboration and peer review.
   (What is each group funded to do? What are the natural opportunities
   for collaboration and comparison?)

2) To compare and discuss techniques for data selection, measurement, error 
   assessment, modeling methodologies, etc.  To compare results in regions
   where they overlap and understand the causes of any differences.

3) To hear about the research customer's (AFTAC and DOE Knowledge Base)
   current and anticipated interests in surface wave research.
   
4)  To discuss information flow and integration. How can research results be
    prepared for efficient use and integration? (Data and information flow;
    software development, testing and implementation.)

5) To identify and discuss fruitful future directions for research. 


	The product of the Workshop will be a Workshop Report and
a web site containing the Report and other contributions from the
Workshop participants. The web page is at the following address:

	http://abdu.colorado.edu/sw_workshop.html

Please check this web site for updated information on the workshop.

	We anticipate that the most useful aspect of the meeting will be 
the discussion sessions. For this reason, relatively large blocks of time 
are assigned to open discussion late in the day on Thursday and then again 
on Friday morning. We will query participants prior to the meeting for 
suggestions on how the discussion sessions should be focused. Each participant 
will also be requested to present a summary of his/her presentation in electronic
form for inclusion on the web site. Space will be provided for posters.

	Information on accommodations and the location of the workshop will
be forwarded shortly.

	Please respond to the invitation at your earliest convenience either 
electronically or by phone to:

	Mike Ritzwoller: ritzwoller@lemond.colorado.edu; 303-492-7075.
or
	Bill Walter: walter@prefect.es.llnl.gov; 510-423-8777.


*********************************************************************************

		Preliminary Agenda:

Wednesday March 18, evening:
---------------------------- 
Informal dinner.

Thursday March 19:
------------------
8 - 10 AM: 		Brief research presentations.
10 - 10:15 AM: 		Break.
10:15 - Noon: 		Brief research presentations.
Noon - 1:00 PM: 	Lunch (catered).
1:00 - 2:00 PM: 	Current and future interests and needs of AFTAC.
2:00 PM - 2:45 PM: 	Sandia Knowledge Base and surface wave data.
2:45 - 3:00 PM: 	Break
3:00 - 5:00 PM: 	Discussion. Discrimination, detection, location,
				source characterization practice.
Evening: 		Informal dinner.

Friday March 20:
----------------
8 AM - Noon: 		Continued discussion of surface wave practice. 
				The future. Recommendations for inclusion
				in the Workshop Report.
~Noon: Adjourn.

*********************************************************************************

Invitees:
DSWA  - Rong Song Jih
NPTO - Charles Meade
AFTAC - Dave Russell, Mark Woods
CMR - Bob North
Sandia - Ralph Keyser, Chris Young
Los Alamos - Howard Patton, George Randall, Laura Jones, Aaron Velasco
Livermore - Artie Rodgers
S**3 - Jeff Stevens
UGSG - Harley Benz, Bob Engdahl, Stu Sipkin, Walter Mooney, Robert Woodward, Antonio Villasensor
Academics: Dave Harkrider, Goran Ekstrom, Brian Mitchell,
Bob Hermann, Gary Pavlis, Dan McNamara, Chuck Ammon, Anatoli Levshin. 
Other researchers working in this area are also welcome.