Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: ADMM-based full-waveform inversion for microseismic imaging   Full waveform inversion (FWI) is beginning to be used to characterize weak
seismic events at different scales, an example of which is microseismic event
(MSE) characterization. However, FWI with unknown sources is a severely
underdetermined optimization problem, and hence requires strong prior
information about the sources and/or the velocity model. The frequency-domain
wavefield reconstruction inversion method (WRI) has shown promising results to
mitigate the nonlinearity of the FWI objective function that is generated by
cycle-skipping. WRI relies on the reconstruction of data-assimilated
wavefields, which approach the true wavefields near the receivers, a helpful
feature when the source is added as an additional optimization variable. We
present an adaptation of a recently proposed version of WRI based on the
alternating direction method of multipliers (ADMM) that first finds the
location of the MSEs and then reconstructs the wavefields and the source
signatures jointly. Finally, the subsurface model is updated to focus the MSEs
at their true location. The method does not require prior knowledge of the
number of MSEs. The inversion is stabilized by sparsifying regularizations
separately tailored to the source location and velocity model subproblems. The
method is tested on the Marmousi model using one MSE and two clusters of MSEs
with two different initial velocity models, an accurate one and a rough one, as
well as with added noise. In all cases, the method accurately locates the MSEs
and recovers their source signatures.

31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph