17:15 〜 18:30
[SGD01-P02] Non-linear visco-elastic modeling of post-seismic gravity change
キーワード：地震後、重力、GRACE
Visco-elastic model plays a pivotal role in helping to explain post-seismic displacement and gravity change. Many modelling methods and programs have been developed based on Maxwell, Burgers and several other linear visco-elastic mechanisms. However, the present linear visco-elastic model fails to cover the entire picture of post-seismic displacement and gravity change. Especially when it comes to the time period 1~2 years immediately after an earthquake. Therefore, we attempt to expand the now linear model into non-linear to improve our understanding of the post-seismic process.
Our method of realizing non-linear gravity change model is based on the theory of spectral finite element method . We combined it with the non-linear visco-elastic model to form our new method. Improvement of program performance is also made after combining the two theory. A new program based on FORTRAN is created independently to demonstrate our method.
Here, we present some examples of model simulated post-seismic gravity change based on the non-linear method. GRACE satellite gravity observation data is used to compare with the simulated gravity change. Our novel non-linear gravity change model could serve as an alternative for the interpretation of observed satellite gravity change and ground displacement after the occurrence of an earthquake.
Our method of realizing non-linear gravity change model is based on the theory of spectral finite element method . We combined it with the non-linear visco-elastic model to form our new method. Improvement of program performance is also made after combining the two theory. A new program based on FORTRAN is created independently to demonstrate our method.
Here, we present some examples of model simulated post-seismic gravity change based on the non-linear method. GRACE satellite gravity observation data is used to compare with the simulated gravity change. Our novel non-linear gravity change model could serve as an alternative for the interpretation of observed satellite gravity change and ground displacement after the occurrence of an earthquake.