Reevaluation of lunar internal structure with reanalysis of deep moonquakes

为了获得月球内部结构的新信息，我们首先利用叠加技术对A1和A33源的深月震进行了分析。通过叠加来自同一震源的多个波形，可以显著提高信噪比。在叠加地震图中，我们发现了一些重要的后期相，其中包括将被识别为PKP或PKKP核心相的磷酸盐。如果这些后期阶段真的是地核阶段，这表明月球地核的半径约为450公里。由于地核相位存在的含意太大，我们决定在其他地震记录中确认地核相位的存在。由于目前的阿波罗数据集检索和分析非常耗时，因此为了继续开展这一研究，构建月球地震记录数据库显得更为重要和高效。为了处理大量的地震记录，建立用户友好、高效的月震数据库显得至关重要。在月球- a任务期间获得的数据也是如此。因此，我们将研究方向转向建立一个新的月震数据库。我们确定了数据库的框架并进行了实现。该数据库将向感兴趣的研究人员广泛开放，因为该数据库是月球内部结构的唯一来源。数据库建成后，我们将继续寻找深月震的后期阶段。

We first analyzed the deep moonquakes from A1 and A33 sources using the stacking techniques in order to obtain new information of lunar internal structure. By stacking many wave forms from an identical seismic source, we could enhance significantly S/N ratio. In the stacked seismograms, we found some significant later phases that include the phate to be identified to be PKP or PKKP core phases. If these later phases are really core phses, it indicates that the lunar core size is approximately 450 km in radius. Since implication of existence of the core phase is so large, we decieded to confirm the existence of core phase in other seismograms. In order to continue this line of research, it is more important and more efficient to construct the data base of the lunar seismograms, because the present Apollo data set is very time-consuming to retrieve and analyze. In order to process many seismograms, it seems essential to construct user-friendly efficient data base of moonquake. This is also true for the data to be obtained during the LUNAR-A mission. Therefore we redirected this research to construct a new moonquake data base. We determined the framework of the data base and implemented. The data base will be widely opened to interested researchers, because this data base is the only source of lunar internal structure. After completion of the data base, we will continue to search for the later phases of deep moonquakes.