地学雑誌
Online ISSN : 1884-0884
Print ISSN : 0022-135X
ISSN-L : 0022-135X
重力のインバージョン
大久保 修平
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ジャーナル フリー

1995 年 104 巻 7 号 p. 1047-1062

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Inversion of potential fields such as gravity has inherent non-uniqueness when it is used for estimating subsurface density structure. The ambiguity could be overcome, at least partially, (1) by using a priori information (such as pointwise drilling data) and (2) by incorporating independent observations (such as geomagnetic anomaly and seismic data). We present several examples demonstrating how gravity inversion is applied for retrieving geologically interesting features (meteor crater, salt dome, volcano, active fault etc.). We emphasize that cooperative inversion should be used whenever possible to obtain better resolution on the underground structure.
Recent advance of the gravity change theory enables us to discuss how to model seismic and volcanic events from gravity change data. Since gravity is sensitive to migration of matter under the ground, gravity inversion is useful in estimating flows of water and magma during such events. Joint inversion of gravity data with conventional crustal movement data proves to be quite effective in modeling the 1989 earthquake swarm and submarine eruption, off Ito.

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