There are times when you might want to compare your event files with that=20
from a nearby network seismic station. You can do this by using the Wilbur I=
I=20
facility at the IRIS web site.

  Here are the instructions for downloading data from a network station as=20
given to me by Bob Hancock when I first started using Wilber II. This proced=
ure=20
is still good. Follow it strictly. Of course, select only the station(s) you=
=20
want. (You have to unchecked the ones you don't want!) The best way to find=20=
a=20
particular event is to select "List All Events". The only thing I do not lik=
e=20
about Wilber II is that they don't give you a chance to review your request=20
before they go to work on it, so you have to select events, stations, and fi=
le=20
type SAC BINARY very carefully.

1.  Access IRIS              http://dmc.iris.washington.edu/
2.  Select Earthquakes   http://dmc.iris.washington.edu/quakes/quakes.htm
3.  Select Wilber II        =20
http://dmc.iris.washington.edu/cgi-bin/wilberII_page1.pl
4.  Select List all events (upper right side)
5   Scroll down to event and click on it
6.  Click on the network for the station you want, then click on Proceed at=20
bottom of page
7.  Unselect the stations you do not want =E2=80=93 Make sure the desired st=
ation is=20
selected.
8.  On left side of page select BHE, BHN, and BHZ
9.  Check SAC BINARY Individual Files on lower left !!!!!
10. Bottom middle =E2=80=93 check time before and after P Wave.  However, si=
nce you=20
are requesting the SPYDER File, it will only be 60 minutes long. You have to=
=20
wait 60 to 90 days for the FARM file to get more than 60 minutes.
11. Bottom right =E2=80=93 Enter a user name, and a request name (event name=
 and date=20
are good to use). Enter your name and email address, and don=E2=80=99t forge=
t to=20
check to be notified when the file is ready. You don't always get an email,=20=
so=20
keep looking at the progress screen. It takes about 5 minutes at most to get=
 the=20
files.  You can download them to your computer. The URL for your data will b=
e:=20
ftp://ftp.iris.washington.edu/pub/userdata/[user name]/[request name].

  Please use my utility SAC_to_PSN for conversion. You will have to modify=20
the PSN file to "Sensor Type=3DVelocity" and enter the correct magnitude. Al=
so,=20
select "Sensor Units" for "Y-Scale Display Mode". Find my utility at=20

 http://bobmcclure90.googlepages.com/winsac

  WinQuake can load SAC files, and also do the conversion, but you will not=20
get the sensor sensitivity number. My utility also transfers magnitude, but=20=
it=20
is never given on the network files. Sensor Type is also never defined on SA=
C=20
files. If you use WinQuake to load and view SAC files, never try to crop or=20
downsample them. Save them as PSN files, and thereafter use the PSN files fo=
r=20
further processing.=20

Cheers,

Bob




**************
Vote for your city's best dining and nightlife. City's Best=20
2008.
      (http://citysbest.aol.com?ncid=3Daolacg00050000000102)
  There are times when you mig=
ht want to compare your event files with that from a nearby network seismic=20=
station. You can do this by using the Wilbur II facility at the IRIS web sit=
e.



  Here are the instructions for downloading data from a network station=
 as given to me by Bob Hancock when I first started using Wilber II. This pr=
ocedure is still good. Follow it strictly. Of course, select only the statio=
n(s) you want. (You have to unchecked the ones you don't want!) The best way=
 to find a particular event is to select "List All Events". The only thing I=
 do not like about Wilber II is that they don't give you a chance to review=20=
your request before they go to work on it, so you have to select events, sta=
tions, and file type SAC BINARY very carefully.



1.  Access IRIS         &n=
bsp;    http://dmc.iris.washington.edu/

2.  Select Earthquakes   http://dmc.iris.washington.edu/quake=
s/quakes.htm

3.  Select Wilber II         ht=
tp://dmc.iris.washington.edu/cgi-bin/wilberII_page1.pl

4.  Select List all events (upper right side)

5   Scroll down to event and click on it

6.  Click on the network for the station you want, then click on Procee=
d at bottom of page

7.  Unselect the stations you do not want =E2=80=93 Make sure the desir=
ed station is selected.

8.  On left side of page select BHE, BHN, and BHZ

9.  Check SAC BINARY Individual Files on lower left !!!!!

10. Bottom middle =E2=80=93 check time before and after P Wave.  Howeve=
r, since you are requesting the SPYDER File, it will only be 60 minutes long=
.. You have to wait 60 to 90 days for the FARM file to get more than 60 minut=
es.

11. Bottom right =E2=80=93 Enter a user name, and a request name (event name=
 and date are good to use). Enter your name and email address, and don=E2=
=80=99t forget to check to be notified when the file is ready. You don't alw=
ays get an email, so keep looking at the progress screen. It takes about 5 m=
inutes at most to get the files.  You can download them to your compute=
r. The URL for your data will be: ftp://ftp.iris.washington.edu/pub/userdata=
/[user name]/[request name].



  Please use my utility SAC_to_PSN for conversion. You will have to mod=
ify the PSN file to "Sensor Type=3DVelocity" and enter the correct magnitude=
.. Also, select "Sensor Units" for "Y-Scale Display Mode". Find my utility at=
 



 http://bobmcclure90.googlepages.com/winsac



  WinQuake can load SAC files, and also do the conversion, but you will=
 not get the sensor sensitivity number. My utility also transfers magnitude,=
 but it is never given on the network files. Sensor Type is also never defin=
ed on SAC files. If you use WinQuake to load and view SAC files, never try t=
o crop or downsample them. Save them as PSN files, and thereafter use the PS=
N files for further processing. 



Cheers,



Bob






**************
Vote for your city's best dining and ni=
ghtlife. City's Best 2008.
      (http://citysbest.aol.com?ncid=3Daolacg0=
0050000000102)