Quick View Run dbdetect to execute STA/LTA detectors on the
waveforms Run dbpick on the database to modify picks Run ttgrid to
make a grid file Run dbgrassoc to produce origin and event tables
Run dbloc2 on the database to modify picks and calculate earthquake
locations
Slide 3
dbdetect dbdetect runs STA/LTA algorithm on seismic data to
determine the arrival times of seismic energy. step1 Copy parameter
file on local directory >pfcp dbdetect your_directory step2 Edit
dbdetect.pf>vi dbdetect.pf step3 Execute dbdetect >dbdetect
-arrivals -pf pffile dbin dbout
Slide 4
STA/LTA algorithm STA/LTA STA Short Time Average LTA Long Time
Average STA LTA (threshold)
Slide 5
STA window LTA window
Slide 6
dbdetect.pf Globel parameters Design multi-filters Assign
station & channel reject station & channel Design
multi-filter for individual station & channel
Slide 7
dbpick - check arrivels
Slide 8
ttgrid Compute a travel time grid file step1 Copy paraneter
file on local directory >pfcp ttgrid your_directory step2 Edit
ttgrid.pf >vi ttgrid.pf step3 Execute ttgrid >ttgrid -pf
ttgrid.pf -time all db > grid_file step4 Display the grid
>displayttgrid grid_file grid_name
Slide 9
ttgrid.pf Design grid 1 Design grid 2 Deisgn grid 3 Design grid
4 grid name ( remember the grid names and how many grids you have
!! )
Slide 10
displayttgrid (check your grid)
Slide 11
dbgrassoc dbgrassoc spatial grid search based
associator/locator step1 Copy paraneter file on local directory
>pfcp dbgrassoc your_directory step2 Edit dbgrassoc.pf>vi
dbgrassoc.pf step3 Execute dbgrassoc >dbgrassoc -pf dbgrassoc.pf
dbin dbout grid_file
Slide 12
dbgrassoc.pf define the parameters for each grids in grid_file
Put your grid name here !!
Slide 13
Output files of dbgrassoc db.origin - hypocenter parameters
db.event - the preferred origin for an event db.arrival - phase,
time of the seismic arrivals db.assoc - connects arrival to origin,
list travel time residuals, etc.