Format for extended fault sources used by AWMs in the CME:
(Steve Day, Jacobo Bielak, Kim Olsen)

We recommend two different source formats: 

1) The primary format
applies to arbitrary propagating events on finite fault surfaces and requires
sliprate time histories specified for each subfault.
The sliprate histories for the primary source format were preferred
over moment tensor solutions for theoretical reasons.
The source format can be partially extracted from the CFM,
a conversion code from the Gocad format is in the makings.
[However, issues such as decimating a too detailed pool of
subfaults or interpolating a too coarse distribution into
appropriate resolution for AWMs remain].

NSRC      Number of source nodes (subfaults) on fault
NST       number of time steps in rupture functions
NXS(k)    Local Cartesian grid point along x for subfault k
NYS(k)    Local Cartesian grid point along y for subfault k
NZS(k)    Local Cartesian grid point along z for subfault k
SRS(k,t)  Sliprate along strike at time t for subfault k
SRU(k,t)  Sliprate up dip at time t for subfault k
strike(k) Dip for subfault  
dip(k)    Strike for subfault  
 
k = 1->NSRC
   nxs(k),nys(k),nzs(k),strike(k),dip(k)
   t = 1->NST
     srs(k,t),sru(k,t)
   end
end

2) The secondary format applies to simple point sources by specification of
a moment rate tensor time history. This format includes non-double-couple 
sources, such as explosions.

NST       number of time steps in source time function
NXS       Local Cartesian grid point for point source
NYS       Local Cartesian grid point for point source
NZS       Local Cartesian grid point for point source
MT(t,[6]) 6 component moment rate tensor at time t

   nxs,nys,nzs
   t = 1->NST
     mt(t,i),i=1,6
   end