Date: February 5, 1998

To: Invited Participants

From: Mike Ritzwoller (CU) and Bill Walter (LLNL)
	ritzwoller@lemond.colorado.edu, bwalter@llnl.gov

Re: Tenative Agenda for the WORKSHOP ON THE U.S. USE OF SURFACE WAVES 
	IN MONITORING THE CTBT


	Included below is the tentative agenda for the CTBT surface
wave workshop. Please check it and let us know if you would like
changes in your contribution. (Is the time too long, too short, the
right subject matter for you, etc.?) We are also interested in more
general comments that you might have about the outline and content
of the meeting. This is a tentative agenda and it is adaptable to the 
interests and considered judgments of the participants. To change it,
however, we will need to hear from you.

	This agenda and updates are available via the web site for
the workshop at:

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

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


THURSDAY MARCH 19, 1998

Morning Session: 
Chair: Mike Ritzwoller

8:00 M. Ritzwoller, B. Walter: Welcome, Introduction, Logistics, and Overview 
of Workshop

Session 1: Regional Dispersion Measurement Comparison
(data selection, measurment methodology, error assessment)

(each speaker plans to talk for less than 10 minutes (max 6 viewgraphs) to allow for
questions and answers from floor) 
8:20    A. Levshin              Measurement at CU and general comments
8:35    D. McNamara             Measurement at LLNL
8:50    L. Jones                Measurement at LANL
9:05    R. Herrmann             Measurement at SLU
9:20    J. Stevens              Global and IDC Measurements
9:35    B. Walter               Comparison of dispersion curves supplied by
                                researchers for 10 preselected event-station 
                                pairs*
9:50    Discussion

10:15-10:30             Break

Session 2: Regional Dispersion Map Comparison
(data coverage, inversion technique, resolution estimation)

(each speaker plans to talk for less than 10 minutes (max 6 viewgraphs) to allow for
questions and answers from floor) 
10:30   D. McNamara     No. Africa and the Middle East
10:45   R. Herrmann     Saudi Arabia and Surroundings
11:00   M. Ritzwoller   Eurasia
11:15   J. Stevens      World 
11:30   A. Rodgers      Comparison of 20 s Rayleigh wave group velocity maps
                        supplied by researchers for 10-50N, 25-100E region*
11:45   Discussion

12:15 - 1:30            Lunch


Afternoon Session:
Chair: Bill Walter

Session 3: Customers for surface wave research

1:30    D. Russell      AFTAC's interest in surface waves
2:30    R. Keyser       DOE Knowledge Base and surface wave information
3:00    C. Meade        NPTO's interest in surface waves
3:15    Discussion

3:45 - 4:00             Break

Session 4: Use and Evaluation of group velocity maps

4:00    J. Stevens      Using group velocity maps and the Ms-mb discriminant
4:30	K. McLaughlin	Surface wave processing at the PIDC
4:45    D. Harkrider    Evaluation of group velocity maps
5:15	Discussion


5:30                    Adjourn for the day.

Evening			Dinner at a good local restaurant.



FRIDAY MARCH 20, 1998

Morning Session: 
Chair: Bill Walter

8:00    M. Ritzwoller, B. Walter        Opening Remarks

Session 5: Dispersion Complications, Problems and Future Directions 

(each speaker plans to talk for less than 10 minutes (max 6 viewgraphs) to allow for
questions and answers from floor)
8:15    E. Larson       Anisotropy and global phase velocity estimation
8:30    M. Ritzwoller  	Source group time shifts, mislocation, anisotropy

Session 6: Source Characterization

(each speaker plans to talk for less than 10 minutes (max 6 viewgraphs) to allow for
questions and answers from floor)
8:45    H. Patton       LANL source characterization
9:00    A. Levshin      Moment tensor, depth estimation for Lop Nor 
9:15    Discussion

Session 7: Velocity models and surface wave dispersion maps

(each speaker plans to talk for less than 10 minutes (max 6 viewgraphs) to allow for
questions and answers from floor)
9:30   W. Mooney       Global crustal model
9:45   B. Walter       Evaluation of MidEast/North Africa velocity models

10:00 - 10:15	Break

10:15   R. Engdahl      Eurasian upper mantle model
10:30   M. Ritzwoller   Eurasian crustal/lithospheric model, potential use for CTBT
10:45   Discussion 

Session 8: Closing Discussion, Preparation of Comments for Workshop Report

11:00 - 12:00  	Discussion
12:00          	Adjourn meeting


* The idea for these two sessions is to ask participants to supply
dispersion curves for 10 pre-selected event station pairs in the
10-50 N latitude, 25-100 E longitude region as well as their
20s Rayleigh wave tomographic maps in this region and then compare them.
The purpose is not to choose which institution's maps or measures are more 
correct, but to understand the causes of any differences the comparisons
reveal and provide a common basis for discussion.