Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nearly constant Q dissipative models and wave equations for general
  viscoelastic anisotropy   The quality factor (Q) links seismic wave energy dissipation to physical
properties of the Earth's interior, such as temperature, stress and
composition. Frequency independence of Q, also called constant Q for brevity,
is a common assumption in practice for seismic Q inversions. Although exactly
and nearly constant Q dissipative models are proposed in the literature, it is
inconvenient to obtain constant Q wave equations in differential form, which
explicitly involve a specified Q parameter. In our recent research paper, we
proposed a novel weighting function method to build the first- and second-order
nearly constant Q dissipative models. Of importance is the fact that the wave
equations in differential form for these two models explicitly involve a
specified Q parameter. This behavior is beneficial for time-domain seismic
waveform inversion for Q, which requires the first derivative of wavefields
with respect to Q parameters. In this paper, we extend the first- and
second-order nearly constant Q models to the general viscoelastic anisotropic
case. We also present a few formulation of the nearly constant Q viscoelastic
anisotropic wave equations in differential form.

33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math