Muon “depth-intensity” relation measured by the LVD underground experiment and cosmic-ray muon spectrum at sea level

We present an analysis of muon events with all muon multiplicities collected during 21804 h of operation of the first Large Volume Detector tower. The measured angular distribution of muon intensity has been converted to the ``depth--vertical-intensity'' relation in the depth range from 3 to 12 km w. e. The analysis of this relation allowed us to derive the power index of the primary all-nucleon spectrum: =2. 780. 05. The ``depth--vertical-intensity'' relation has been converted to standard rock and the comparison with the data of other experiments has been done. We also present the derived vertical muon spectrum at sea level.