Thread: ppk questions

Dear All -

1) If you pick with A, P, S or F a labeled mark will be left on the trace. However, these picks change the file header, so if you don’t want them made permanently, don’t write the header out.

2) The SAVELOCS option to PPK will save the locations of the mouse, when picked with L, in blackboard variables that may be retrieved after the PPK command. You can write those into a text file if you want.

To my knowledge, SAC only reports a cursor position to the screen when L is used in a PPK operation. Mouse clicks don’t mean anything.

On 3 Aug 2019, at 00:31, Igor <stubailo<at>gmail.com> wrote:

Hello,

I have 2 questions about the ppk.
Could you please help me to find out the answers?

1) When the ppk is enabled, after every mouse click, the time is printed in the upper left corner. Is there a way to place a marker (a bw or color symbol ) on the seismogram where the mouse click was done?

2) Is there a way to save the ppk picks in a text file (not to see them on the screen only)?

Thank you ,
Igor

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George Helffrich
george<at>elsi.jp

Hi Igor,
Here's what I would do within a macro or a shell script. Assume that you
are picking two phases in the same seismogram and writing the arrival times
into T1 and T2 headers.

* read files using a wild card
DO FILE WILD *.SAC
READ $FILE

* Show pick "A" by a cross (c) with width (w) 0.1 & height(h) 0.3
PICKS T1 C W 0.05 H 0.3
PLOTPK

* Show pick "B" by a cross (c) with width (w) 0.1 & height(h) 0.3
PICKS T2 C W 0.05 H 0.3
PLOTPK

WRITE OVER

ENDDO


Now you can extract your headers within a shell script, for example, using
saclst:

pick_file.txt

saclst T1 T2 f my_file.SAC | awk '{ print $2,$3 }' >> pick_file.txt

Januka

Januka Attanayake
Research Fellow | Earthquake Seismology
Homepage: *https://sites.google.com/site/janukaattanayake
https://sites.google.com/site/janukaattanayake*

School of Earth Sciences | McCoy Bldg. 200
University of Melbourne | Parkville 3010 VIC
Australia




On Sat, 3 Aug 2019 at 09:32, Igor <stubailo<at>gmail.com> wrote:

Hello,

I have 2 questions about the ppk.
Could you please help me to find out the answers?

1) When the ppk is enabled, after every mouse click, the time is printed
in the upper left corner. Is there a way to place a marker (a bw or color
symbol ) on the seismogram where the mouse click was done?

2) Is there a way to save the ppk picks in a text file (not to see them on
the screen only)?

Thank you ,
Igor

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