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VOLUME 50 (1989) | ISSUE 10 | PAGE 411
Analysis of readings of underground acoustic installation on 23 February 1987
There is a statistically significant increase above the background in acoustic signals detected in an underground shaft in the Carpathian Mountains between 6 and 9 h UT on 23 February 1987. These signals were not associated with seismic processes or human activities. Since a supernova explosion (SN 1987A) was detected in the Large Magellanic Cloud at 10.40 UT (IAU Circ, 1987, No. 4316), it is possible that these signals were associated with SN 1987A.