TIC WG A, minutes from teleconference, June 22, 2004

Participants: Mitch Withers, Dave Oppenheimer, Harley Benz, Rich Eisner,
Egill Hauksson, Won-young Kim, Ron Tognazzini

The draft document developed by Egill was discussed with particular focus
on the tables.

There was general agreement that the format was good.  Will need to
provide definitions (e.g. define accuracy for a given parameter) in
appendices.

Rows of tables should not be geographic regions or ANSS regions. Rather
they should be densely monitored/active regions, urban, non-urban, national,
and global.  Or something along those lines.  Note that we do not necessarily
need to define what dense means.  Rather station density will be whatever
it takes to meet other specs such as completeness threshold.  For some
applications however (e.g. urban strong motion), more specific language or
preferences may be appropriate such as N stations per zip code.

What is magnitude uncertainty.  Those who determine magnitude often
don't know the uncertainty and it is also dependent on the type.  Those
who use magnitude require uncertainty.  We can make guesstimates such
as 0.3 for short-period magnitude types and 0.2 for broaderband types.
But these are still more rules of thumb rather than reproducible calculations.
We'll need to make a best attempt at definitions in the appendix.

For strong motion particularly for engineering purposes, magnitude is a
poor threshold.  Rather we should use acceleration such as 0.1% g.
Do we really need 4g on scale?  We apparently do, in general, want more
than 2g.

What about other products and operational issues?  We don't want to get
into specifics such as redundancies, power backup requirements, etc.
These come along for free given other specs such as percent completeness
But what about System SOH, Operational Reports, DYFI etc.  Perhaps we
can have a narrative form under a section such as Other Products.

It is obvious that this report will not be complete by June 30.  Mitch
will send what we have at that time with the caveat that a more complete
version will be forthcoming in a week or two.

Members will review the draft, paying particular attention to column headings
and numbers used in the specs and send to the group.  Preferably this week.
Mitch will collate this weekend and send to the group.

Next conference call same time (1pm EDT) on June 29.