Japan Geoscience Union Meeting 2016

Presentation information

International Session (Oral)

Symbol S (Solid Earth Sciences) » S-TT Technology & Techniques

[S-TT17] Recent Advances in Exploration Geophysics (RAEG2016)

Tue. May 24, 2016 10:45 AM - 12:15 PM A03 (APA HOTEL&RESORT TOKYO BAY MAKUHARI)

Convener:*Hitoshi Mikada(Kyoto University), Yoshihisa Iio(Disater Prevention Research Institute, Kyoto University), Yasuo Ogawa(Volcanic Fluid Research Center Tokyo Institute of Technology), Junichi Takekawa(Graduate School of Science, Kyoto University), Junzo Kasahara(University of Shizuoka, Faculty of Earth Scieces), Nobukazu Seama(Department of Planetology, Graduate School of Science, Kobe University), Tatsuya Sato(Geothermal Energy Research & Development Co., LTD.), Eiichi Asakawa(JGI, Inc.), Chair:Hitoshi Mikada(Kyoto University), Toshinori Kimura(Japan Agency for Marine-Earth Science and Technology)

11:30 AM - 11:45 AM

[STT17-10] Frequency-domain mesh-free finite difference operator for visco-acoustic wave equation

*Junichi Takekawa1, Hitoshi Mikada1 (1.Graduate School of Science, Kyoto University)

Keywords:mesh-free finite difference method, frequency domain

We developed a new approach for visco-acoustic wave equation in frequency-domain using a mesh-free method. Recently, full-waveform inversion (FWI) has been used for investigating sub-surface properties with high resolution. One of the problems of FWI is the high computational costs, like computational memory and CPU time. This stems from forward modeling for calculating theoretical waveforms. So, it is important to improve the computational efficiency of forward modleing. There are two categories in forward modeling, i.e. time-domain and frequency-domain. The frequency-domain method has some advantages over the time-domain method. However, the frequency-domain modeling runs up the computational costs if the size of the coefficient matrix becomes large. So, it is important to decrease the degree of freedoms without sacrificing the accuracy. In the present study, we apply a mesh-free finite difference method to the frequency-domain modeling for saving the computational costs. Our numerical results show that the mesh-free finite difference method can improve numerical efficiency in keeping with high-accuracy. This indicates that the method can be an altanative to the conventional grid-based methods.