Thread: Re: lacking GCARC, EVDP, EVLA, EVLO header infornmation and relative time

Hi Panxu-

It appears that the SEED file you got back from BREQ_FAST did not
include any hypocenter blockettes. This tells me that perhaps JWEED
is not including a .HYPO directive in the request file. (there's also
a .SOURCE and .MAGNITUDE that go with it).

Indeed, running a quick test with the latest JWEED (3.2), I get a
BREQ_FAST file that is properly formed, but lacks any mention of the
hypocenter the pick was derived from:

.NAME Robert Casey
.INST IRIS DMC
.EMAIL rob<at>iris.washington.edu
.LABEL CMB.BK.test
.PHONE
.MEDIA FTP
.ALTERNATE MEDIA
.ALTERNATE MEDIA
.FROM_JWEED
.END
CMB BK 1993 7 27 23 45 13 1993 7 28 0 1 0 1 * *

The event in this case was
EVENT: MHDF,1993/07/27 23:49:13.130,40.31,-124.464,8.1,MD/2.9,MD/2.9

The event lines that would go into the BREQ_FAST request would look
something like this:
.SOURCE ~NEIC PDE~Jul 1993 PDE~National Earthquake Information Center
- USGS DOI~
.HYPO ~1993 07 27 23 49 13.130~ 40.31~-124.464~8.1~0~0~0~
.MAGNITUDE ~2.9~MD~
I'll add to our JWEED developer's to-do list to add the user's
selected event information to the BREQ_FAST request so that you get
origin information in your SEED volume (and hence your SAC file).

In the meantime, it is possible for you to add these values to your
BREQ_FAST file if you save the request from JWEED, then edit it in a
text editor, before mailing it off to IRIS DMC. More information on
hypocenters and other BREQ_FAST entries can be found in this web manual:

http://www.iris.edu/manuals/breq_fast.htm

Thanks for alerting us to this issue. It's something that passed our
notice during testing and really should be included as far as I am
concerned.

-Rob


On Aug 27, 2010, at 11:10 AM, Panxu Zhang wrote:

Hi Rob,

All of the files are lack of header informations. You can start with
the smallest one--File:bh1990-1992.26595.seed
1280 KB
8/25/10
3:50:00 PM

I used JWEED 3.0 to get seed files and "rdseed -dpf" or "rdseed -d -
o 1 -f" "rdseed -df" to extract SAC from seed.
SAC version is Version 101.3.

Actually, I think that the header should have been completed, right?
There may be something wrong with the way I proceed(I used JWEED to
generate breq_fast request), which leads to the lost of header
information. But I do not know where it is.

Thanks!!
Hope to hear from you soon!

Panxu


On Fri, Aug 27, 2010 at 10:14 AM, Robert Casey <rob<at>iris.washington.edu

wrote:

Thank you Panxu-

Can you please indicate which of the files you currently have the
problem with? Is it all of them in this directory?

File:1993-1995.3692.seed
44736 KB
8/25/10
6:28:00 PM

File:1999-2000.3918.seed
144544 KB
8/25/10
4:35:00 PM

File:1999-2004_seed.15502.seed
154868 KB
8/24/10
12:38:00 PM

File:2004-2008.22386.seed
569636 KB
8/25/10
6:15:00 PM

File:2009-2010.9433.seed
444292 KB
8/24/10
4:08:00 PM

File:2009-2010_seed.7927.seed
286324 KB
8/24/10
11:43:00 PM

File:bh1990-1992.26595.seed
1280 KB
8/25/10
3:50:00 PM

File:bh1996-1998.16937.seed
93568 KB
8/25/10
4:21:00 PM

File:bh2001-2003seed.3055.seed
393152 KB
8/25/10
3:59:00 AM

-Rob

On Aug 26, 2010, at 4:21 PM, Panxu Zhang wrote:

Rob,

Thanks very much for your reply!!
I used JWEED to generate breq_fast request to get SEED. I think it
is a full SEED but I am not quite sure. Here is the data: ftp://ftp.iris.washington.edu/pub/userdata/Panxu_Zhang
Hope to hear from you soon!

Panxu


On Thu, Aug 26, 2010 at 3:54 PM, Robert Casey <rob<at>iris.washington.edu

wrote:

Thank you for alerting us to this problem, Panxu. We'll see
if we can help you with tracking down the cause.

Did you write your SEED files directly from JWEED? Were
these miniSEED files or was it full SEED with hypocenter
information in the header?

-Rob


On Aug 26, 2010, at 12:35 PM, Arthur Snoke wrote:

Your earlier message did get delivered, but I do not use JWEED so
did not respond.

I assume you have no event information (you did not mention BAZ and
AZ, but I am guessing they are not there).

In general you should incude information about platform and SAC
version, but I doubt those are relevant for your problem.

Hopefully someone who uses your kind of processing can comment, but
I suggest you try a sample event file that you access using a
different method and make sure your calls to RDSEED are as they
should be.

On Thu, 26 Aug 2010, Panxu Zhang wrote:

Hi all,
I am not sure whether I have successfully sent this email before
but I
really need someone to help.
My SAC files 1) lost GCARC, EVDP, EVLA, EVLO header information; 2)
time
appears to be absolute instead of relative(B = 0.000000e+00) when I
used
"rdseed -dpf" to extract SAC from seed.
What should I do to get those above header informations?
I used JWEEDv3.12 to get the seed files and rdseed 5.0 to extract.
Thank you in advance!!
Panxu

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