A1 moonquakes, problems of determining their epicenters and mechanisms

Details A1 moonquakes, problems of determining their epicenters and mechanisms A1 moonquakes, problems of determining their epicenters and mechanisms

Sep 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973moon....6..292m&link_type=abstract

The Moon, Volume 6, Issue 3-4, pp. 292-303

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Scientific paper

Although now four seismic stations are operating on the Moon the determination of epicenters and mechanisms of moonquakes is still problematic. On the Moon no decoupling of compressional, transverse, and surface waves takes place, no clear first arrivals can be found, and coherence between vertical and horizontal components of a seismograph station is poor. New methods of locating epicenters are presented. They consist of a statistical analysis of the first arrival groups and correlation of components of tidal forces to arrival times in relation to perigee. Certain regions of the Moon, as for instance the Eastern boundary of Mare Nubium, can be considered highly suspicious as possible source region; others have to be ruled out as here triggering by tidal stress seems highly improbable. From various possible mechanisms a connection with a degassing of the Moon seems to offer an acceptable explanation.

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