  Using the Geant4 code, we have performed a full-scale simulation of the LSD
response to the neutrino burst from SN1987A. The neutrino flux parameters were
chosen according to one of the models: the standard collapse model or the
rotational supernova explosion model. We showed that, depending on the chosen
parameters, one can either obtain the required number of pulses in the detector
or reproduce their energy spectrum, but not both together. The interaction of
neutrino radiation both with LSD itself and with the material of the
surrounding soil was taken into account in our simulation. We also explored the
hypothesis that the entire unique LSD signal at 2:52 UT was produced by neutron
fluxes from the surrounding granite. However, this hypothesis was not confirmed
by our simulation. The results obtained provide a rich material for possible
interpretations.
