 |
SPEAR (Seismogram Picking Error from Analyst Review)
-
Behavioral Experiment
|
I
am a doctoral student working under Aaron Velasco and a fellowship with
the AFRL. I am conducting a study to show the variablity in picking
seismograms. I cordially invite you to participate in this experiment,
I need all levels of experience so once you have picked the data set,
if you work with anyone that has picked seismograms please pass the
data set on to them with this information.
The
ability to identify and mark Seismic Phases on a seismogram is a
fundamental skill that has gone unnoticed with the advent of automatic
and sophisticated picking software. Freedman (1966) performed the first
detailed experiment comparing picks generated by different Analysts.
Since this initial experiment, no further analysis has been completed
to understand the current state of human picked seismograms. I am
creating a data set of Picked Seismograms from many seismologists and
will determine an error model associated with the factors that predict
the error associated with picking Seismic Phases.
|
|
|
|
|
|
|
|
|
How to Participate:
Please make your initial picks using the script provided (picker.csh).
Save results (pick_all.out) by renaming to LastName_pick_all.out. If
you use a different tool set or process the seismograms to pick them
please repick the data set using your standard procedure (Do not reuse
your initial picks). Save these reults by renaming pick_all.out to
LastName_processed.out Please attach a brief description of the tools
and processing steps used in picking the seismograms. Also I need a
brief profile of your experience by answering these questions:
- Years experience picking:
- Average number of seismograms picked per year:
- Number of seismograms picked in last 6 months:
- Type of seismograms picked: (local, regional, teleseismic, explosions...) list all that apply.
If
you do not use SAC feel free to use which ever program you are
comfortable with, I can convert the seismograms to whatever format you
need. However, please specify which program you are using and the
format of your pick file. The picks will be recorded as follows when
using the picker.csh script (for P and S picks please define the
quality of the pick using E or I, U or D, 0-4, if you are familiar with
this convention):
- Amarker - P or Pg
- T0- S or Sg
- T1- Pn
- T2- Sn
- T4- Lg
- T5- Rg
If
you think you can identify other phases use one of the other T markes
and set the KT header value to represent that phase, also make a note
in your brief description of the pick.
When the picks
are complete please send me the pick files (LastName_pick_all.out and
LastName_processed.out) and the brief description of your picking
profile, processing steps/tools, and additional phase you picked to
cpzeiler@utep.edu.
|
| TOP
OF PAGE
|
|
|
|
|
|
|
| # of Analysts | 12 |
| Total # of Picks | 647 |
| # Pg picks | 311 |
| # Sg picks | 123 |
| # Lg picks | 153 |
| TOP
OF PAGE
|
|
|
|
|
Freedman, H. W. (1966). The "Little Variable Factor" statistical discussion of the reading of seismograms, Bulletin of the Seismological Society of America, Vol. 56, No. 2, pp. 593-604.
|
| TOP
OF PAGE
|
|
|
|
|
| TOP
OF PAGE
|
| |
|
|
|
|
|
|
|
|
|
