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Reevaluation of lunar internal structure with reanalysis of deep moonquakes

通过深层月震再分析对月球内部结构进行再评估

基本信息

批准号：
04835014
负责人：
MIZUTANI Hitoshi
金额：
$ 1.28万
依托单位：
The Institute of Space and Astronautical Science
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04835014/
关键词：
Lunar Seismology Apollo Project Lunar Internal Structure Data Base Seismic Processing Planetary Science Moonquake Deep moonquake 月食ペネトレータ月のコア走時曲線スタッキング

项目摘要

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.

为了获得月球内部结构的新信息，我们首先对A1和A33源的深月震进行了叠加分析。通过对同一震源的多种波形叠加，可以显著提高信噪比。在叠加的地震图中，我们发现了一些重要的后期震相，其中包括被识别为PKP或PKKP核心震相的地震。如果这些后期阶段真的是核心阶段，则表明月球核心的半径约为450公里。由于核震相存在的意义很大，我们决定在其他地震记录中确认核震相的存在。为了继续这一研究方向，建立月球地震图数据库更为重要和有效，因为目前的阿波罗数据集检索和分析非常耗时。为了处理大量的月震图，建立一个用户友好、高效的月震数据库显得十分必要。在LUNAR-A使命期间获得的数据也是如此。因此，我们将这项研究重新导向建立一个新的月震数据库。我们确定了数据库的框架，并实施。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。