Program received signal SIGSEGV: Segmentation fault - invalid memory reference

[Jeffrey]

  Hello, Mr.  @Liu, I have installed the program and successfully run the example, It is very convenient. But when calculating my data, the following error occurred：

                      DAzimSurfTomo
 input Rayleigh wave phase velocity data file:
Rayleigh.dat                                                                      
 model origin:latitude,longitue
   36.5000  100.0000
 grid spacing:latitude,longitue
    0.5000    0.5000
 model dimension:nx,ny,nz
   40   48    6
 depth refined interval layer 
     2.0
 smoothing for dVsv 
   240.0
 smoothing for Gc, Gs 
     0.0
 damping
     0.0
 number of period
    13
 Rayleigh wave phase velocity used,periods:(s)
   4.0   6.0   8.0  10.0  12.0  14.0  16.0  18.0  20.0  25.0  30.0  35.0  40.0
 begin load data file.....
 Number of all measurements 380374
  grid points in depth direction:(km)
   0.00  10.00  20.00  30.00  40.00  50.00
  -----------------------------------------------------------
           1 th iteration, invert for isotropic Vs para.
  -----------------------------------------------------------
Program received signal SIGSEGV: Segmentation fault - invalid memory reference.
Backtrace for this error:`

(Then there's nothing left, and it has to be terminated with "Ctrl + C")

   I guess that our phase velocity data file is too large (more than 380000 lines). When only a small part is taken, it can be calculated. Is there any good solution? Thank you very much

[Jeffrey]

Mr Liu have taught me to decrease the sparsity fraction.