This report highlights the usefulness and applicability of various gravimetric methods for studying earthquakes and volcanic activities. A high-resolution gravity anomaly map of Japan reveals areas with very steep horizontal gradients, where potential seismic faults are likely to be buried. Such traditional geoprospecting is coupled with novel cosmic-ray radiography to produce a fine-resolution (<100 m) three-dimensional density structure of a volcano. On the other hand, temporal gravity changes provide invaluable information about the process of earthquake faulting, volcanic eruptions, caldera formation, etc. Specifically, in this report we present our previous work on gravity research for solid earth science: (1) the first detection of coseismic gravity changes, (2) the virtual visualization of the rising and falling of magma in a conduit of Asama volcano, and (3) the large-scale lateral movement of magma during the Miyake-jima eruption in 2000.

中文翻译：

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重力分析在研究火山和地震方面的进展。

本报告重点介绍了各种重力法在研究地震和火山活动方面的有用性和适用性。日本的高分辨率重力异常图显示水平梯度非常陡峭的区域，潜在的地震断层很可能被掩埋。这种传统的地质勘探方法与新颖的宇宙射线射线照相技术相结合，可产生高分辨率（<100 m）的火山三维密度结构。另一方面，时间重力变化提供了有关地震断层，火山喷发，火山口形成等过程的宝贵信息。具体地说，在本报告中，我们介绍了我们先前在固体地球重力研究中的工作：（1）首次探测同震引力变化