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Auto-location and manual location in Antelope

Min-Hung Shih 10/13/2011 Ver. 0.3. Auto-location and manual location in Antelope. 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

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Auto-location and manual location in Antelope

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  1. Min-Hung Shih 10/13/2011 Ver. 0.3 Auto-location and manual location in Antelope

  2. Quick View • Run dbdetect to execute STA/LTA detectors on the waveforms • Run dbpickon 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.

  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 reject station & channel Design multi-filter for individual station & channel Design multi-filters Assign station & channel

  7. dbpick - check arrivels

  8. ttgrid • Compute a travel time grid file

  9. grid name ( remember the grid names and how many grids you have !! ) ttgrid.pf Design grid 2 Deisgn grid 3 Design grid 1 Design grid 4

  10. displayttgrid (check your grid)

  11. dbgrassoc • dbgrassocspatial grid search based associator/locator

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

  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 !!!

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