Tomographic inversion for three‐dimensional velocity structure at Mount St. Helens using earthquake data

Lees, Jonathan M.; Crosson, Robert S.

doi:10.1029/jb094ib05p05716

Cited by 222 publications

(143 citation statements)

References 27 publications

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“…We apply damped LSQR (Paige and Saunders, 1982) with preconditioning to find the least-squares solution. Laplacian smoothing was applied in the inversion (Lees and Crosson, 1989). The least-squares solution is under the assumption that P and S waves share the same ray paths.…”

Section: Methodsmentioning

confidence: 99%

Imaging Poisson's Ratio of the Uppermost Mantle beneath China

Shi

Sun

et al. 2011

Bulletin of the Seismological Society of America

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(1) the pseudowave velocity is high and the velocity ratio (V P =V S ) and Poisson's ratio are low in the stable cratons around the Tibetan Plateau such as the Tarim and Junggar basins, the Ordos craton, and the southern region of the Sichuan basin; (2) a low pseudowave velocity and high velocity ratio and Poisson's ratio exist in the central and northern Tibetan Plateau, the North-South Seismic Zone, and north China; and (3) the high velocity ratio and Poisson's ratio region in the Tibetan Plateau extends to the surrounding cratons, suggesting that the uplift of the Tibetan Plateau results from a high Poisson's ratio or partially melted rocks beneath the plateau and that the softer rocks have intruded into the upper mantle of surrounding cratons.

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Section: Methodsmentioning

confidence: 99%

Imaging Poisson's Ratio of the Uppermost Mantle beneath China

Shi

Sun

et al. 2011

Bulletin of the Seismological Society of America

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“…After several iterations, a small model variance indicates the final solution approached. Since data outliers and unevenness of ray paths tend to make the linear equation systems ill-conditioned, we also used smoothness constraints to control unreasonable local anomalies in inversion results [Lees and Crosson, 1989].…”

Section: Methodsmentioning

confidence: 99%

Seismic structure of the Longmen Shan region from S‐wave tomography and its relationship with the Wenchuan Ms 8.0 earthquake on 12 May 2008, southwestern China

Huang

et al. 2010

Geophysical Research Letters

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[1] Using arrival time data, we determined seismic structure of the Longmen Shan by S-wave tomography and studied its relations with the Ms 8.0 earthquake in Wenchuan, southwestern China. Our results suggest that the Longmen Shan fault belt is a rheologic boundary between the eastern Tibetan plateau and the Sichuan basin, and the deep crust of the entire Longmen Shan is significantly thickened by ductile deformation. The upper structure of the eastern Tibetan plateau is cored by the high-velocity Pengguan massif. Its collision with the Sichuan basin is the most direct reason for the seismic ruptures on the Longmen Shan fault belt north of Wenchuan, while the lack of earthquakes south of Wenchuan is related to the weakness of the crust. Therefore, The Ms 8.0 earthquake occurred in a strongly heterogeneous region. The variations in the crustal structure largely controlled the initial rupture of the Ms 8.0 earthquake and aftershock activity. Citation: Xu, Y., Z. Li, R. Huang, and Y. Xu (2010), Seismic structure of the Longmen Shan region from S-wave tomography and its relationship with the

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“…We apply damped LSQR (Paige and Saunders, 1982) with preconditioning to find the least-squares solution. Laplacian smoothing was applied in the inversion (Lees and Crosson, 1989). …”

Section: Methodsmentioning

confidence: 99%

The updated crustal attenuation in North China using ML amplitude tomography

Pei

Chen

2010

Earthq Sci

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We have updated the lateral variations of the quality factor Q 0 (Q at 1 Hz) beneath the crust of North China using M L amplitude tomography with near three times data. The data were selected from the Annual Bulletin of Chinese Earthquakes (ABCE) in 1985−2009, including 26 283 M L amplitude readings from 4 204 events recorded by 38 stations. The result is similar with previous research but has higher resolution. Estimated Q 0 values are consistent with tectonic and topographic structure in North China. Q 0 is low in the active tectonic regions having many faults, such as Bohai bay, North China basin, the Shanxi and Yinchuan grabens, while it is high in the stable Ordos craton. Q 0 values are low in several topographically low-lying areas, such as the North China, Taikang-Hefei, and Subei-Huanghai Sea basins, whereas it is high in mountainous and uplift regions exhibiting surface expressions of crystalline basement rocks: the Yinshan, Yanshan, Taihang, Qinling and Dabie mountains, Luxi and Jiaoliao uplifts. Quality factor estimates are also consistent with Pn and Sn velocity patterns. High velocity values in general correspond with high Q 0 and vice versa. This coincides with a common temperature influence in the crust and uppermost mantle.

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Tomographic inversion for three‐dimensional velocity structure at Mount St. Helens using earthquake data

Cited by 222 publications

References 27 publications

Imaging Poisson's Ratio of the Uppermost Mantle beneath China

Imaging Poisson's Ratio of the Uppermost Mantle beneath China

Seismic structure of the Longmen Shan region from S‐wave tomography and its relationship with the Wenchuan Ms 8.0 earthquake on 12 May 2008, southwestern China

The updated crustal attenuation in North China using ML amplitude tomography

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