Segmentally Iterative Ray Tracing in Complex 2D and 3D Heterogeneous Block Models

Xu, Tao; Zhang, Zhongjie; Gao, Ergen; Xu, G. S.; Sun, Ling Hui

doi:10.1785/0120090155

Cited by 32 publications

(20 citation statements)

References 38 publications

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“…By correcting the structural model many times and using forward calculation by ray tracing to calculate the travel times of multi-phases (Cerveny et al, 1988;Vidale, 1988;Zelt and Smith, 1992;Cerveny, 2001;Xu T et al, 2004;Xu et al, 2006Xu et al, , 2010Xu et al, , 2014bLi et al, 2013;Lan et al, 2013aLan et al, , 2013b, we obtained the final crust-mantle model. The identification of seismic phases has a great impact on the velocity structure and therefore the geophysical model for the study region needs to be the most accurate possible to adequately constrain the medium.…”

Section: Later Arrivalsmentioning

confidence: 99%

Crustal velocity structure in the Emeishan large igneous province and evidence of the Permian mantle plume activity

Zhang

Liu

et al. 2015

Sci. China Earth Sci.

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The Emeishan large igneous province (ELIP) in SW China is interpreted to be associated with an ancient mantle plume. Most of the constraints on the role of mantle plume in the generation of the Emeishan flood basalts were provided by geological and geochemical methods, but the geophysical investigation is very limited. In order to better understand the deep structure and features of ELIP, we have studied the crustal velocity structure using the data acquired from the Lijiang-Panzhihua-Qingzhen wide-angle seismic profile. This profile crosses the three sub-zones of the ELIP (the inner, intermediate, and outer zones), divided based on the differential erosion and uplift of the Maokou limestone. The results provided by the active source seismic experiment demonstrate: (1) The average depth of the crystalline basement along the profile is about 2 km. (2) The middle crust in the Inner Zone is characterized by high-velocity anomalies, with the average velocity of 6.26.6 km/s, which is about 0.1-0.2 km/s higher than the normal one. The velocity of the lower crust in the inner zone is 6.97.2 km/s, higher than those observed in the intermediate and outer zones (6.77.0 km/s). Relatively low velocity anomalies appear in the upper, middle and lower crusts near the junction of the inner zone and intermediate zone, probably due to the effect of the Xiaojiang fault (XJF). (3) The average velocity of the crust is comparatively low on both sides of XJF, especially on the east side, and the average velocity of the consolidated continental crust is also low there. This may suggest that the XJF extends at least down to 40 km deep, even beyond through the crust. (4) The depth to the Moho discontinuity decrease gradually from 4753 km in the inner zone, via 4250 km in the intermediate zone to 3842 km in the outer zone. In the inner zone, the Moho uplifts locally and the (consolidated) crust is characterized by high-velocity anomalies, which are likely related to intensive magma intrusion and underplating associated with melting of plume head. Overall the crustal velocity structure in the study area recorded the imprint left by the Permian Emeishan mantle plume. Emeishan large igneous province, Permian mantle plume, wide-angle seismic reflection/refraction data, Lijiang-PanzhihuaQingzhen profile, crustal velocity Citation:Xu T, Zhang Z J, Liu B F, et al. 2015. Crustal velocity structure in the Emeishan large igneous province and evidence of the Permian mantle plume activity. Science China: Earth Sciences,

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Section: Later Arrivalsmentioning

confidence: 99%

Crustal velocity structure in the Emeishan large igneous province and evidence of the Permian mantle plume activity

Zhang

Liu

et al. 2015

Sci. China Earth Sci.

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“…The Chinese Academy of Sciences (CAS), the China Earthquake Administration (CEA) and the Ministry of Land and Resources of China (MLR) contributed to perform these seismic profiles during the last 20 years. The Moho discontinuity marks the boundary between the crust and mantle, and generally the P-wave velocity value representing the crust-mantle transition is assumed to be 8.0 km/s (Teng, 2003;T. Xu et al, 2010;Y.…”

Section: Moho Undulationmentioning

confidence: 99%

3-D density structure under South China constrained by seismic velocity and gravity data

et al. 2014

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“…The methods to solve the propagation of seismic waves mainly include wave-field simulation (Carcione et al 1992;Lan and Zhang 2011;Liu et al 2014a, b), seismic ray tracing (Cerveny 2001;Cardarelli and Cerreto 2002;Xu et al 2006Xu et al , 2008Xu et al , 2010Xu et al , 2014 and traveltime calculation using eikonal equation (Faria and Stoffa 1994;Lan and Zhang 2013a, b). Compared with the method of traveltime calculation using eikonal equation, ray tracing methods not only can obtain the traveltime of the seismic wave field, but also can get the ray trajectories in the ground (Shearer and Chapman 1989;Cerveny 2001).…”

Section: Introductionmentioning

confidence: 99%

“…To solve this problem, Zhao et al (1992Zhao et al ( , 1994 and Zhao and Lei (2004) developed a method using the Snell's law to correct the path points on discontinuous interfaces. Xu et al (2010Xu et al ( , 2014) developed a ray tracing perturbation scheme of combination of pseudo-bending methods and segmentally iterative methods. In recent decades, the ray tracing methods developed include wavefront reconstruction methods (Vinje et al 1993(Vinje et al , 1996a(Vinje et al , b, 1999, slowness matching methods (Symes 1996;Symes and Qian 2003), Huygens wavefront tracing methods (Sava and Fomel 2001), shortest path methods (Moser 1991;Fischer and Lees 1993;Zhou and Greenhalgh 2005) and simulated annealing methods (Bona et al 2009).…”

Section: Introductionmentioning

confidence: 99%

“…How to accurately describe the geological model with undulating interfaces is very important for solving the seismic wave propagation. The methods always used include the approximation method with ladderlike grids , the model expansion method with regular grids (Hole 1992;Ma and Zhang 2014), the nonuniform grid spacing method (Sun et al 2012a, b), the hybrid grid spacing method (Sun et al 2009(Sun et al , 2012aBai et al 2010Bai et al , 2013Li et al 2013), the curved grid spacing method (Thompson et al 1985;Ruud 1994, 1998;Dong 2005;Wang and Liu 2006;Hestholm et al 2006;Lan et al 2012;Zhang 2011, 2013a, b;Ma and Zhang 2014) and the triangulated meshing method (Fomel 1997;Sethian 1999;Xu et al 2006Xu et al , 2010Kao et al 2008;Yu et al 2010;Bai et al 2012). The triangular grids are simple and flexible in modeling and can describe any undulating terrain with high degree of approximation.…”

Section: Introductionmentioning

confidence: 99%

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Ray tracing of turning wave in elliptically anisotropic media with an irregular surface

Zhang

Bai

et al. 2017

Earthq Sci

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Seismic ray tracing in anisotropic media with irregular surface is crucial for the exploration of the fine crustal structure. Elliptically anisotropic medium is the type of anisotropic media with only four independent elastic parameters. Usually, this medium can be described by only the vertical phase velocity and the horizontal phase velocity for seismic wave propagation. Model parameterization in this study is described by flexible triangular grids, which is beneficial for the description of irregular surface with high degree of approximation. Both the vertical and horizontal phase velocities are defined in the triangular grids, respectively, which are used for the description of phase velocity distribution everywhere in the model by linear interpolation. We develop a shooting ray tracing method of turning wave in the elliptically anisotropic media with irregular surface. Runge-Kutta method is applied to solve the partial differential equation of seismic ray in elliptically anisotropic media. Linearly modified method is used for adjusting emergent phase angles in the shooting scheme. Numerical tests demonstrate that ray paths coincide well with analytical trajectories in transversely homogeneous elliptically anisotropic media. Seismic ray tracing results in transversely inhomogeneous elliptically anisotropic media demonstrate that our method is effective for further first-arrival tomography in elliptically anisotropic media with an irregular surface.

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Segmentally Iterative Ray Tracing in Complex 2D and 3D Heterogeneous Block Models

Cited by 32 publications

References 38 publications

Crustal velocity structure in the Emeishan large igneous province and evidence of the Permian mantle plume activity

Crustal velocity structure in the Emeishan large igneous province and evidence of the Permian mantle plume activity

3-D density structure under South China constrained by seismic velocity and gravity data

Ray tracing of turning wave in elliptically anisotropic media with an irregular surface

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