Читать книгу Muography - Группа авторов - Страница 43

We have described the three‐dimensional density imaging methods used for multi‐directional muographic imaging of volcanoes, using the linear inversion and FBP techniques. The performance of each method was estimated by a forward modeling simulation. For both methods, it is clear that the spatial resolution increases with the number of observation directions. If the internal density structure is rather simple, it is possible to detect density contrasts as a blurred distribution, even if the number of observation directions is only four. However, the density structure inside a volcano can be made clearer when other observational measurements are available (e.g., gravity data). Further technological developments, reconstruction methods for three‐dimensional imaging, and multiple observational measurement techniques will provide new insights into volcanic structures.