Wavefield Processing, Analysis, Imaging and Inversion with Application to Both Marine and Land Long-Offset Seismic Data

Project Details

Description

This proposal is organized to explore a unified approach through data analysis, wavefieldprocessing, inversion and imaging with specific goal for exploring both shallow and deep structurethrough the usage of both land and marine seismic data. The proposed methodology is a multi-purposeresearch plan by combining three major tasks through unified approach for simultaneous source,propagation and crustal structure imaging. Data collection, assimilation and organization for both shallowsedimentation and deep structure imaging are the major efforts being done in the past. However, issuesincluding promoting and demonstrating research capability for various scientific targets are obviously moreimportant for the next generation active/passive seismology research in Taiwan. Drawing good science andpublish findings from existing seismic dataset become important for the next decade. Fundamental issuesincluding wavefield data pre-processing and pre-conditioning follow by depth migration andinversion are naturally included in the proposed approach. Two types of field data resources: (1)broadband teleseismic and short period velocity waveform data from both BATS/TSMIP and (2) wide-anglemulti-channel land and marine seismic data collected from both TAICRUST (1991-1995) and TAIGER(2006-2008) international project will be used for various research projects.The objectives of the proposal tentatively try to cover both theoretical studies and algorithmdevelopments: (1) To extend the previous work from 2-D to 3-D. Theoretical and coding development, testand evaluation of various wave propagation simulators. (2) To enhance the strength of computationalseismology for better understanding of more realistic wave propagation phenomena. (3) Demandinghardware facility and parallel computing algorithms are needed for development efforts and practicalapplications. (4) FWI will be used in conjunction with travel-time inversion for setting up velocity referencemodels. Practical applications are: (1) To perform pre-stack imaging for both wide-angle land andMCS/OBS marine seismic data. (2) To investigate the effects of attenuation as the function of distance,depth, frequency, scattering and AVO/AVA effects and the feasibility of reverse-time wave propagation,migration and inversion. (3) To explore the spatial and temporal distribution of an earthquake source andthe three-dimensional heterogeneous earth structure. (4) To investigate source, path and site responsesincluding topography effects; amplification due to effects of shallow soil/sedimentary layers, basin shape,lateral velocity variation, Q distribution and/or others. (5) To simulate earthquake source mechanism andrupture process when large earthquake occurred under or in the immediate vicinity of Taiwan Island. (6)Apply receiver function analysis to explore 3D Conrad and Moho geometries beneath Taiwan Island.Accurate seismic modeling, both in time- and frequency domain computations of acoustic, elastic,viscoacoustic/viscoelastic, anisotropic (VTI/HTI/TTI) and porous media responses will be developed, testedand evaluated for different applications. Current 3D spatial distribution of P-, S-velocity will be studied,modified, and evaluated accordingly. For field data study, we will utilize both short-offset/long-offset activesource data and strong motion/short period records that are widely available through TSMIP and broadbanddata management system (DMS) since 1990. Wide-angle seismic data will potentially from the study ofocean-bottom seismograph and multi-channel marine seismic data from TAICRUST/TAIGER experiments.The results from various applications covering both wavefield processing, simulation and inversion will bepublished in the international journal. The main computation kernel for Wave propagation will utilize SEM,modified high order staggered grid FDM and PSM/PSREM for different targeted scientific problems.
StatusFinished
Effective start/end date1/08/1631/10/17

UN Sustainable Development Goals

In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This project contributes towards the following SDG(s):

  • SDG 11 - Sustainable Cities and Communities
  • SDG 14 - Life Below Water
  • SDG 17 - Partnerships for the Goals

Keywords

  • Modeling
  • Complex Crustal Structure
  • 2D
  • 3D
  • Source and Structure Imaging
  • FWI

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