Crustal structures in the area of the 2008 Sichuan earthquake from seismologic and gravimetric data

Robert, Alexandra; Zhu, Jing; Vergne, Jérôme; Cattin, Rodolphe; Chan, Lungsang; Wittlinger, G.; Herquel, Georges; Sigoyer, Julia de; Pubellier, Manuel; Zhu, L.

doi:10.1016/j.tecto.2009.11.010

Cited by 69 publications

(57 citation statements)

References 28 publications

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“…The Longmen Mountains and the WSFB have apparently different deep lithospheric structures (Wang et al, 2007;Robert et al, 2010;Zhang et al, 2010b). The depth of the crust and lithosphere thickness progressively increases from the WSFB (e.g., the crust thickness with 40-50 km) to the Longmen Mountains (e.g., the crust thickness with 60-75 km).…”

Section: Categorymentioning

confidence: 99%

Architecture of basin-mountain systems and their influences on gas distribution: A case study from the Sichuan basin, South China

Liu

Deng

et al. 2012

Journal of Asian Earth Sciences

104

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Section: Categorymentioning

confidence: 99%

Architecture of basin-mountain systems and their influences on gas distribution: A case study from the Sichuan basin, South China

Liu

Deng

et al. 2012

Journal of Asian Earth Sciences

104

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“…8) modeling used herewith; and (3) the assumptions made about a uniform rupture velocity of the seismic source of a complex geology region such as the Longmen Shan fault system and the Sichuan region as a whole, as Robert et al (2009) and Densmore et al (2007) have pointed out.…”

Section: Modeling Resultsmentioning

confidence: 99%

“…The geologic structure of Figure 8 took the regional structural geotectonic and geophysical information available for the Sichuan region into account; that is, in the first instance, the selection considered the geometry and layering of the crust of the kinematic volume (about 700 × 700× 80 km 3 ) proposed by Wang et al (2007) and shown in Figure 3 for the region surrounding and including the seismic source of the M w 7.9 Wenchuan earthquake (Robert et al, 2009). Based on seismologic and gravity data, Robert et al (2009) concluded that the hypocenter of the 12 May 2008 Wenchuan earthquake is located very close to a westwarddipping interface (starting close to the surface at the Longmen Shan front and flattening at ∼15 km depth) between the lower crust under the Sichuan basin and the eastern Songspan-Garze terrane (see fig. 2 of Robert et al, 2009).…”

Section: D Modeling Of the Wave Propagation Of The 12mentioning

confidence: 99%

“…Based on seismologic and gravity data, Robert et al (2009) concluded that the hypocenter of the 12 May 2008 Wenchuan earthquake is located very close to a westwarddipping interface (starting close to the surface at the Longmen Shan front and flattening at ∼15 km depth) between the lower crust under the Sichuan basin and the eastern Songspan-Garze terrane (see fig. 2 of Robert et al, 2009).…”

Section: D Modeling Of the Wave Propagation Of The 12mentioning

confidence: 99%

“…In the western Sichuan Plateau (eastern Tibetan Plateau), this collision generates several seismically active systems of faults, such as the Longmen Shan fault system (Densmore et al, 2007;Robert et al, 2009), where the hypocenter of the 12 May 2008 M w 7.9 Wenchuan earthquake is located at a depth of 10-20 km (U.S. Geological Survey [USGS] data, see Data and Resources section). Among other manifestations of the collision, recent Global Positioning System measurements of crustal motion in the central eastern Tibetan Plateau and its adjacent foreland indicate a shortening of about 3 mm=year within the Longmen Shan region; this suggests an average recurrence interval of seismic activity from 2000 to 10,000 years (Burchfield et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

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Low-Frequency 3D Wave Propagation Modeling of the 12 May 2008 Mw 7.9 Wenchuan Earthquake

Chávez¹,

Cabrera²,

Madariaga³

et al. 2010

Bulletin of the Seismological Society of America

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The seismic potential of southern China is associated with the collision between the Indian and the Eurasian plates. This is manifested in the western Sichuan Plateau by several seismically active systems of faults, such as the Longmen Shan. The seismicity observed on the Longmen Shan fault includes recent events with magnitudes of up to 6.5, and the one of 12 May 2008 M w 7.9 Wenchuan earthquake. Herewith, as part of an ongoing research program, a recently optimized threedimensional (3D) seismic wave propagation parallel finite-difference code was used to obtain low-frequency (≤ 0:3 Hz) 3D synthetic seismograms for the Wenchuan earthquake. The code was run on KanBalam (Universidad Nacional Autónoma de México, Mexico) and HECToR (UK National Supercomputing Service) supercomputers. The modeling included the U.S. Geological Survey 40 × 315 km 2 kinematic description of the earthquake's rupture, embedded in a 2400 × 1600 × 300 km 3 physical domain, spatially discretized at 1 km in the three directions and a temporal discretization of 0.03 s. The compression and shear wave velocities and densities of the geologic structure used were obtained from recently published geophysical studies performed in the Sichuan region. The synthetic seismograms favorably compare with the observed ones for several station sites of the Seismological and Accelerographic Networks of China, such as MZQ, GYA, and TIY, located at about 90, 500, and 1200 km, respectively, from the epicenter of the Wenchuan event. Moreover, the comparisons of synthetic displacements with differential radar interferometry (DinSAR) ground deformation imagery, as well as of maximum velocity synthetic patterns with Mercalli modified intensity isoseist of the 2008 Wenchuan earthquake, are acceptable. 3D visualizations of the propagation of the event were also obtained; they show the source rupture directivity effects of the M w 7.9 Wenchuan event. Our results partially explain the extensive damage observed on the infrastructure and towns located in the neighborhood of the Wenchuan earthquake rupture zone.

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Quantifying the impact of mechanical layering and underthrusting on the dynamics of the modern India‐Asia collisional system with 3‐D numerical models

et al. 2014

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The impact of mechanical layering and the strength of the Indian lower crust on the dynamics of the modern India-Asia collisional system are studied using 3-D thermomechanical modeling. The model includes an Indian oceanic domain, Indian continental domain, and an Asian continental domain. Each domain consists of four layers: upper/lower crust, and upper/lower lithospheric mantle. The Tarim and Sichuan Basins are modeled as effectively rigid blocks and the Quetta-Chaman and Sagaing strike-slip faults as vertical weak zones. The geometry, densities, and viscosities are constrained by geophysical data sets (CRUST2.0, gravity, and seismology). Both static (no horizontal movement of model boundaries) and dynamic scenarios (indentation) are modeled. It is demonstrated that 3-D viscosity distributions resulting from typical creep flow laws and temperature fields generate realistic surface velocities. Lateral variations in the gravitational potential energy cause locally significant tectonic overpressure (i.e., difference between pressure and lithostatic pressure) in a mechanically strong Indian lower crust (up to~500 MPa for the static scenario and~800 MPa for the dynamic scenario). Different density distributions in the lithosphere as well as different viscosities (3 orders of magnitude) in the Indian lower crust cause only minor differences in the surface velocity field. This result suggests that

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Crustal structures in the area of the 2008 Sichuan earthquake from seismologic and gravimetric data

Cited by 69 publications

References 28 publications

Architecture of basin-mountain systems and their influences on gas distribution: A case study from the Sichuan basin, South China

Architecture of basin-mountain systems and their influences on gas distribution: A case study from the Sichuan basin, South China

Low-Frequency 3D Wave Propagation Modeling of the 12 May 2008 Mw 7.9 Wenchuan Earthquake

Quantifying the impact of mechanical layering and underthrusting on the dynamics of the modern India‐Asia collisional system with 3‐D numerical models

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