How to locate earthquakes with Antelope commands?

Auto-location and manual location in AntelopeMin-Hung Shih 10/13/2011 Ver. 0.3Quick ViewRun dbdetect to execute STA/LTA detectors on the waveformsRun dbpick on the database to modify picksRun ttgrid to make a grid fileRun dbgrassoc to produce origin and event tablesRun dbloc2 on the database to modify picks and calculate earthquake locationsdbdetectdbdetect runs STA/LTA algorithm on seismic data to determine the arrival times of seismic energy.

STA/LTA algorithm STA/LTA STAShort Time AverageLTALong Time AverageSTALTA(threshold)

STA windowLTA windowdbdetect.pf

Globel parametersDesign multi-filtersAssign station & channelreject station & channelDesign multi-filter for individual station & channeldbpick - check arrivels

ttgridCompute a travel time grid filettgrid.pf

Design grid 1Design grid 2Deisgn grid 3Design grid 4grid name ( remember the grid names and how many grids you have !! )displayttgrid (check your grid)

dbgrassocdbgrassoc spatial grid search based associator/locatordbgrassoc.pf

define the parameters for each grids in grid_filePut your grid name here !!Output files of dbgrassocdb.origin - hypocenter parametersdb.event - the preferred origin for an event db.arrival - phase, time of the seismic arrivalsdb.assoc - connects arrival to origin, list travel time residuals, etc.dbloc2 - Interactive hypocenter location>dbloc2 dbname

Practice !!!