attenuation

衰减的设置项(还需进一步的了解)

未确定作用的设置项有：

ATTENUATION_VISCOEALSTIC = .false.

ATTENUATION_VISCOACOUSTIC = .false.

N_SLS = 3

ATTENUATION_f0_REFERENCE = 5.196

READ_VELOCITIES_AT_f0 = .false.

USE_SOLVOPT = .false.

ATTENUATION_PORO_FLUID_PART = .false.

Q0_poroelastic = 1

freq0_poroelastic = 10

UNDO_ATTENUATION_AND_OR_PML = .false.

NT_DUMP_ATTENUATION = 500

NO_BACKWARD_RECONSTRUCTION = .false.