Multi-order vector finite element modeling of 3D magnetotelluric data including complex geometry and anisotropy

Earth, Planets and Space

Table 1 Time and memory used in MoVFEM with GPML-I boundary conditions (Fang and Wu 1996)

Element	Linear	Quadratic	Lagrangian
Grid N_e	\(62\times 62\times 47\)	\(26\times 26\times 20\)	\(26\times 26\times 20\)
DoF	561,519	172,680	338,352
NNZE	9,291,615	6,979,448	17,158,968
Assembly time	195.27 s	382.04 s	750.64 s
Total time	9872.5 s	2104.37 s	3584.95 s
\(\epsilon ^{\text{avg}}_\rho\)	\(12.88\%\)	\(0.23\%\)	\(0.17\%\)
\(\epsilon ^{\text{avg}}_\phi\)	\(7.37\%\)	\(2.21\%\)	\(2.21\%\)

Times are shown in seconds, and the memory is presented in terms of the number of elements \(N_\text{e}\), the number of unknowns (DoF) and the number of non-zero entries for the global array NNZE. Average errors are shown for resistivity \(\epsilon ^{\text{avg}}_\rho\), and for the phase \(\epsilon ^{\text{avg}}_\phi\)