Special Reports

Centroid Moment Tensor Solution - Harvard Geophysical Laboratory

Upstate New York M5.1 earthquake, April 20, 2002

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The following is a REVISED solution for the April 20, 2002, event in New York. This CMT solution was determined by analysis of long-period body waves (45-150 s) and intermediate-period surface waves (40-100 s or 50-200 s). A preliminary very-broad-band analysis of teleseismic P waveforms gives a depth for this event of 10.4 km.

Here is the solution for the recent event.
April 20, 2002, NEW YORK, Mw=5.0

Meredith Nettles
Mike Antolik

CENTROID, MOMENT TENSOR SOLUTION
HARVARD EVENT-FILE NAME S042002A
DATA USED: GSN 
L.P. BODY WAVES: 23S, 38C, T= 45
SURFACE WAVES:   27S, 58C, T= 40

CENTROID LOCATION:
ORIGIN TIME       10:50:48.2 0.2
LAT 44.69N 0.01;LON  73.80W 0.02
DEP   8.9 0.8;HALF-DURATION  1.4
MOMENT TENSOR; SCALE 10**23 D-CM
  MRR= 3.19 0.17; MTT= 0.10 0.08
  MFF=-3.29 0.10; MRT=-1.45 0.25
  MRF=-0.46 0.18; MTF=-0.13 0.04
 PRINCIPAL AXES:
 1.(T) VAL=  3.78;PLG=68;AZM=172
 2.(N)      -0.44;    21;      6
 3.(P)      -3.34;     5;    274
BEST DOUBLE COUPLE:M0=3.6*10**23
 NP1:STRIKE=343;DIP=44;SLIP=  59
 NP2:       203;    53;      116

            --#########           
        ----------##-------       
      -----------###---------     
    -----------#######---------   
   -----------##########--------  
  -----------############-------- 
  ----------##############------- 
   --------###############--------
 P -------#################-------
   ------##################-------
 --------########   #######-------
  -------######## T #######------ 
  -------########   #######------ 
   ------##################-----  
    -----#################-----   
      ----###############----     
        --##############---       
            ###########           

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