Simultaneous observation of extensive air showers and deep-underground muons at the Gran Sasso Laboratory.
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Combined measurements of extensive air showers at the surface and high-energy muons deep underground have been initiated at the Gran Sasso Laboratory. The underground detector is the first supermodule of MACRO (area = 140 m2, depth = 3100 m of water equivalent, E>1.3 TeV) and the surface detector is the EAS-TOP array (altitude 2000 m above sea level, total enclosed area A105 m2). We discuss the correlation technique, the comparison between the shower parameters as determined by the two detectors, and some of the characteristics of the reconstructed events. 1990 The American Physical Society.