First-arrival traveltime inversion with embedded boundary method for irregular topography

2020 ◽  
Author(s):  
Yunhui Park ◽  
Sukjoon Pyun
Keyword(s):  
Traveltime Inversion ◽  
Boundary Method ◽  
Embedded Boundary ◽  
First Arrival ◽  
Irregular Topography ◽  
Embedded Boundary Method

Damped wave-equation-based first-arrival traveltime tomography using the embedded boundary method

Geophysics ◽  
2021 ◽  
pp. 1-91
Author(s):  
Yunhui Park ◽  
Sukjoon Pyun
Keyword(s):  
Wave Equation ◽  
Real Data ◽  
Damped Wave Equation ◽  
Traveltime Tomography ◽  
Velocity Models ◽  
Boundary Method ◽  
Embedded Boundary ◽  
First Arrival ◽  
Irregular Topography ◽  
Modeling Algorithm

First-arrival traveltime tomography (FATT) is used to delineate shallow velocity structures to identify static effects in oil exploration as well as to characterize the near surface for geotechnical purposes. Because FATT is generally used for land seismic data processing, it becomes necessary to consider irregular topography especially when performing wave-based tomography. However, the standard Cartesian finite-difference method cannot properly handle irregular topography. Hence, the embedded boundary method (EBM) is incorporated into the frequency-domain damped-wave equation in order to correctly describe irregular topography. The developed modeling algorithm is used to calculate first-arrival traveltimes and to perform FATT. The EBM-based modeling algorithm accurately describes the irregular surfaces of numerical velocity models on a regular mesh by exploiting the mirror image principle. The accuracy of the EBM-based traveltime calculation is validated by using two homogeneous velocity models with dipping and complex surfaces. The validation results demonstrate that the proposed algorithm is unaffected by the staircase approximation. The FATT is then applied to synthetic and real data to demonstrate the applicability of the developed algorithm to velocity models with complex topography. For the real data example, the inverted velocity model is used to apply static corrections. The processing results demonstrate an improvement in the continuity of seismic events, thus confirming the accuracy of the developed FATT method.

scholarly journals A Fourth-Order Accurate Embedded Boundary Method for the Wave Equation

2012 ◽  
Vol 34 (6) ◽  
pp. A2982-A3008 ◽  
Author(s):  
Daniel Appelö ◽  
N. Anders Petersson
Keyword(s):  
Wave Equation ◽  
Fourth Order ◽  
Boundary Method ◽  
Embedded Boundary ◽  
Embedded Boundary Method

scholarly journals A cartesian grid embedded boundary method for the compressible Navier–Stokes equations

2013 ◽  
Vol 8 (1) ◽  
pp. 99-122 ◽  
Author(s):  
Daniel Graves ◽  
Phillip Colella ◽  
David Modiano ◽  
Jeffrey Johnson ◽  
Bjorn Sjogreen ◽  
...  
Keyword(s):  
Stokes Equations ◽  
Cartesian Grid ◽  
Navier Stokes ◽  
Navier Stokes Equations ◽  
Boundary Method ◽  
Embedded Boundary ◽  
Embedded Boundary Method

scholarly journals An embedded boundary method for viscous, conducting compressible flow

2006 ◽  
Vol 216 (1) ◽  
pp. 37-51 ◽  
Author(s):  
Zoran Dragojlovic ◽  
Farrokh Najmabadi ◽  
Marcus Day
Keyword(s):  
Compressible Flow ◽  
Boundary Method ◽  
Embedded Boundary ◽  
Embedded Boundary Method

scholarly journals A fast local embedded boundary method suitable for high power electromagnetic sources

AIP Advances ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 115318
Author(s):  
Mathialakan Thavappiragasam ◽  
Andrew Christlieb ◽  
John Luginsland ◽  
Pierson Guthrey
Keyword(s):  
High Power ◽  
Boundary Method ◽  
Embedded Boundary ◽  
Embedded Boundary Method
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