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This file contains a brief description of the format used in the ASCII 
version of the Harvard centroid-moment tensor (CMT) catalog. The original
description of the CMT method can be found in:

Dziewonski, Chou, and Woodhouse, JGR, 86, 2825-2852, 1981.
Dziewonski and Woodhouse, JGR, 88, 3247-3271, 1983.

All of the moment tensor solutions have been published in Physics of the Earth 
and Planetary Interior, and new solutions are published there as quarterly 
reports. These reports also contain descriptions of various enhancements to 
the original algorithm, including the incorporation of laterally heterogeneous 
earth models and the use of broad band data for depth determination.
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B010177C  1/ 1/77 11:33:41.6  30.66  137.06 476.05.20.0SOUTH OF HONSHU, JAPAN
MLI BW: 5 14  45 MW: 0  0   0 DT=   4.3 0.7  30.62 0.07  136.80 0.10 476.5  4.8
 DUR 1.8 EX 24 -0.32 0.05  0.80 0.08 -0.48 0.09  1.01 0.10 -0.36 0.08  0.40 0.07
   1.41 29 354  -0.15 31 104  -1.26 45 230   1.34  33 32 -163 289 81  -59
C010277A  1/ 2/77  9:55:28.4 -10.17  118.99  19.05.86.3SUMBA ISLAND REGION
MLI BW: 5 12  45 MW: 5 15 135 DT=   8.8 0.3 -10.41 0.02  118.86 0.04  24.5  1.5
 DUR 6.0 EX 25  2.48 0.09 -2.46 0.05 -0.02 0.07  1.81 0.20  0.06 0.16 -0.01 0.04
   3.07 72 357  -0.02  1  89  -3.06 18 179   3.07 271 27   92  89 63   89

B010177C  1/ 1/77 11:33:41.6  30.66  137.06 476.05.20.0SOUTH OF HONSHU, JAPAN
1st line: date, origin time, latitude, longitude, mb, MS, region 
         (all as reported by NEIS or ISC).

MLI BW: 5 14  45 MW: 0  0   0 DT=   4.3 0.7  30.62 0.07  136.80 0.10 476.5  4.8
2nd line: first three characters: MLI=epicenter info from NEIC Monthly listings;
          PDE=from Preliminary listings; ISC=from ISC catalog.
          Number of stations and total number of
          body-wave records used in the inversion  (5 and 14). Same for mantle
          waves (0 and 0). DT is the centroid time from the inversion 
          (4.3 seconds) measured from origin time; its standard error (0.7); 
          centroid latitude, longitude and depth, each with standard error.

DUR 1.8 EX 24 -0.32 0.05  0.80 0.08 -0.48 0.09  1.01 0.10 -0.36 0.08  0.40 0.07
3rd line: Assumed half duration (1.8 sec) [NOTE - this value is assumed and is 
          not a result of the inversion]; EX=exponent of all moment values that 
          follow  (24  means all moments are 'value*10**24'); moment tensor 
          elements, each followed immediately by its standard error. 
          The coordinate system is r-up, s-South, e-East, and the 6 elements 
          are ordered Mrr, Mss, Mee, Mrs, Mre, Mse. See Aki and Richards for 
          conversion to other systems.

   3.07 72 357  -0.02  1  89  -3.06 18 179   3.07 271 27   92  89 63   89
4th line: moment tensor expressed in its principle axis system; 
          eigenvalue (3.07), plunge (72) and strike (357) of eigenvector 1 
          -- repeated for 2 other axes. Scalar moment (3.07 -- to be multiplied 
          by 10**24). Strike (271), dip (27), and rake (92) for best 
          double couple -- repeated for second nodal plane. Aki and Richards 
          convention for fault angles.
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Goran Ekstrom 
Harvard University 
Department of Earth and Planetary Sciences
20 Oxford Street
Cambridge, MA 02138
ekstrom@geophysics.harvard.edu
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