All,

I added a few new features to the BB Data Request page at
http://www.seismicnet.com/bbrequest.html as well as some documentation on
how to use the form and a section on how it all works. If you see any typos
please let me know.

I added the ability to add event report information from NEIS (National
Earthquake Information Service) and have the event information show up in
the created event files. This is like adding event report information using
WinQuake, only the info will already be in the header of the download event
file. I also made it possible to create all Z, N-S , and E-W channels for
either the 1 SPS data (LH* channels) or the 20 SPS data (BH*). 

To use Event Report feature, you first click on the Current NEIS Event
Report link. This invokes a CGI script that does a finger to NEIS and saves
the returned information to a file. This file then gets displayed as a web
page. The user then uses the systems clipboard to transfer one event report
line to the Current NEIS Event Report field on the previous page. A more
detailed description on how to do this is in the help section of the BB
Request page.

After placing the report line in the field, the user can then select the
station(s), channel(s), number of minutes to save and optionally the start
date and time and make a request. If the start date and time fields are
left blank, the start time of the request will be the time of the event.
The start date and time fields  overwrite the event time if they contain
valid information.

If your request returns one or more valid event files you can then download
the file and view it with WinQuake or view the seismogram as a GIF image
using your web browser. Since the output format can be SAC Binary other
display / analyzing  programs should be able to use this data. If you use
the new PSN Explorer program the downloading and displaying of the event
file in WinQuake will all happen automatically. You need to use the
PSNExplorer.exe file that comes in the current 2.6.8 beta release. I needed
to make a change to PE so that it will work correctly downloading data from
the /userdata/ directory on my Web / FTP server.

If a large teleseismic event happens it should be possible to locate the
even, if you can get enough P and S picks, using the new mapping feature in
the beta release of WinQuake.  Using the data from your own station, and
hopefully some of the BB stations, you should be able to approximately the
magnitude, where the event occurred and the time of origin of the event.

 Please let me know if you run into any problems or have any suggestions. 

-Larry Cochrane
Redwood City, PSN


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