Here is the source time function for the 970111_Mexico  event.
 If you have any questions or comments, please contact
         tanioka@umich.edu
                         Debra Tjoa
                         Yuichiro Tanioka and Larry Ruff
                         University of Michgan
 
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970111_Mexico                           
 LOCATION      18.250  LAT.    -102.800  LONG.                          
 ORIGIN TIME=  20 HOUR 28 MIN 25.7 SEC GMT   (NEIC Ms 6.8)
 Focal mechanism ( modified USGS MT )
      strike  dip   rake        strike  dip   rake
      278.    10.    73.        115.    80.    93.
 Depth  13. km (the best depth)
 Number of stations: 10
 The Maximum moment rate (10**20 Nm/s) =    5.39406E-02
 One "space" represents    1.00000 sec
 Moment of the main pulse:  0.920 (10**20 Nm) at 30. sec (Mw 7.3)
 
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/==============================   
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0        10        20        30sec
                                  
 
 Numerical values of source time function
 Sampling dt:  1.0sec
 X10**17 Nm/sec
  0.00  2.17  3.73  6.42 12.45 19.83 26.84 31.30 32.52 33.87
 40.07 48.08 51.33 52.06 53.81 53.94 52.06 52.54 52.37 47.33
 42.57 40.56 37.28 32.54 28.75 23.91 17.26 11.39  7.83  4.89
  1.40
(STF Catalog Listing, go to: "http://www.geo.lsa.umich.edu/SeismoObs/STF.html")