  In this report we investigate whether and under what conditions virtual
seismology via the acoustic Marchenko method can be applied to DAS data from a
survey in the province of Groningen, The Netherlands. Virtual seismology allows
to retrieve the band-limited Green's function between a virtual source at an
arbitrary focal point in the subsurface, while accounting for all orders of
multiples. The method requires the reflection response at the surface and an
estimate of the traveltime between the surface and focal point. However, in
order to successfully apply the method the reflection response needs to be free
from surface waves and other direct waves, and properly scaled in order for the
Marchenko scheme to converge. These limitations severely complicate the
application of the Marchenko method to field data, especially seismic surveys
on land. This report considers a full 2D geophone survey as well as a 1.5D
approximation for a DAS survey, and compares the results of the virtual sources
with an actual dynamite source. The results show that virtual seismology can be
used to recreate the reflections recorded at the surface from the dynamite
source using either geophone or DAS data.
