Modeling a 3-D Subsurface Structure Around Damaged Area Due to the Recent Earthquakes in Niigata, Japan Using Gravity Survey

Abstract eng:
Many active foldings are found and it is known that the subsurface structure is complex in the Niigata-ken Chuetsu area, Japan, where two destructive earthquakes were occurred on 2004 and 2007. In a case where we want to simulate the earthquake ground motions during the main shock in this area, detailed information is required with respect to the subsurface structure. This kind of information, however, is not provided enough in this time. We, thus, carried out the gravity survey around Chuetsu area at 517 sites and estimate a 3-D shape of the upper boundary for the gravity basement. For this, we develop a new technique to estimate the 3-D structure of ground with some different densities. Applying the technique, we obtain a model of subsurface structure. Through the comparison of the proposed model and the results from some previous researches, we can conclude that the proposed model provides more accurate and detailed information than previous ones.

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