New Analysis of Data From the Apollo Long Period Event Catalog to Search for Deep Moonquakes on the Lunar far Side

Details New Analysis of Data From the Apollo Long Period Event Catalog to Search for Deep Moonquakes on the Lunar far Side New Analysis of Data From the Apollo Long Period Event Catalog to Search for Deep Moonquakes on the Lunar far Side

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufm.p51a0913s&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #P51A-0913

Physics

5430 Interiors (8147), 8147 Planetary Interiors (5430, 5724, 6024)

Scientific paper

In the last years lunar seismograms that were recorded within the Apollo missions between 1969-77 were newly evaluated. Of 12558 detected events, Nakamura (2003) identified 7245 events as deep moonquakes originating from 250 separate regions in depths between 700 and 1200 km. The new survey identified deep moonquakes on the lunar far side, where just one quake had been located previously. In the here presented evaluation of the seismograms, the new Apollo Long Period Event Catalog was used. Firstly errors that could interfere with the stacking of events belonging to one nest had to be reduced by despiking and filtering. After picking arrival times, some of the nests were newly located using the moon model by Nakamura (1983) on a polyhedral grid to compare the calculated arrival times with the picked arrival intervals. The used methods show good results for the picked arrival intervals, although it works only for big stacks of events. The new non linear location method allows a precise assessment of location ambiguities. Nests that had been located in earlier publications to be on the lunar far side are difficult to locate, the data for Nest A033 also allows a near side solution. With proper delineation of uncertainties, the far side events could help to constrain further models of the lunar interior.

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