1. Min-Hung Shih 1/22/2015 Ver. 0.4

2. 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

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

4. STA/LTA algorithm  STA/LTA 運算程序，就是利用所謂的 「短時窗信號平均值」與「長時窗信號平 均值」的比值，判讀地震訊號  STA 為 Short Time Average 之縮寫，也就 是短時窗信號平均值，另一要素為 LTA ， 是 Long Time Average 之縮寫，也就是長 時窗信號平均值，當 STA 除以 LTA 之值大 於設定值 (threshold) 時，即視為地震訊號

5. STA window LTA window

6. dbdetect.pf Globel parameters Design multi-filters Assign station & channel reject station & channel Design multi-filter for individual station & channel

7. dbpick - check arrivels

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

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 !! )

10. displayttgrid (check your grid)

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

12. dbgrassoc.pf define the parameters for each grids in grid_file Put your grid name here !!

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.

14. dbloc2 - Interactive hypocenter location  >dbloc2 dbname

15. Practice !!!