Coseismic Slip Distribution of the 2008 Mw 7.9 Wenchuan Earthquake from Joint Inversion of GPS and InSAR Data

Xu, Caijun; Yang, Liu; Wen, Yangmao; Wang, Rongjiang

doi:10.1785/0120090253

Cited by 117 publications

(101 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…1). The depth of 5 km suggests that a large part of the seismic moment releases in shallow depths, which is consistent with existing fault slip models (Shen et al 2009;Xu et al 2010;Wang et al 2011). The best-fit mechanism distribution along the optimal line fault is shown in Fig.…”

Section: A P P L I C At I O N T O T H E 2 0 0 8 M W 7 9 W E N C H Usupporting

confidence: 88%

“…At the two ends of the line fault, where neither ruptures nor aftershocks were found (Xu et al 2010;Wang et al 2011;Hartzell et al 2013), scalar moments were fixed to be zeros. We have tried different smoothing factors (λ), and found that values between 1 and 10 are all acceptable.…”

Section: A P P L I C At I O N T O T H E 2 0 0 8 M W 7 9 W E N C H Umentioning

confidence: 99%

“…The 2008 M w 7.9 Wenchuan earthquake has been extensively studied for its slip distributions by using various seismic and geodetic data sets (Zhang et al 2009b;Xu et al 2010;Wang et al 2011;Yagi et al 2012;Hartzell et al 2013). In most previous studies, the fault geometries were either adopted from teleseismic CMT solutions or postulated based on surface ruptures and regional tectonics Xu et al 2009), and were fixed during slip inversions.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Geodetic inversion for source mechanism variations with application to the 2008 Mw7.9 Wenchuan earthquake

Zhang

Wang

2015

Geophysical Journal International

View full text Add to dashboard Cite

S U M M A R YSince centroid moment tensor (CMT) solution is not enough to describe the mechanism variations of large earthquakes, multiple CMTs were investigated in recent years by inverting seismic waveforms to retrieve the mechanism complexities. However, a problem in these waveform inversions is the trade-off between spatial mechanism variation and temporal rupture process, which may lead to ambiguous results. In this work, we propose a simple but practical approach to invert geodetic coseismic data for spatial mechanism variation. Because there is no need to solve for rupture velocity, geodetic inversion is generally more efficient and robust than waveform inversion. This approach was used to investigate the mechanism variation of the 2008 Wenchuan earthquake. In the case study, a line fault, whose position had been optimized through a 3-D grid search, was used to approximate the rupture fault, aiming to determine the mechanism variations along the strike direction. From the inversion results, there are thrustslips and strike-slips in the southwest and northeast, respectively. The mechanism change appears at 160-200 km to the northeast of the epicentre, where compensated linear vector dipoles (CLVDs) have a local maximum and also support a significant mechanism change. By testing eight line faults with different positions, it is found that the inversion results do not strongly depend on the fault position, suggesting that the mechanism and its variations are robustly constrained in coseismic data inversion with our approach. Compared to waveform inversions, this work provides a more effective way to explore the mechanism complexities, and lays a foundation for future joint inversion of seismic and geodetic data sets.

show abstract

Section: A P P L I C At I O N T O T H E 2 0 0 8 M W 7 9 W E N C H Usupporting

confidence: 88%

Section: A P P L I C At I O N T O T H E 2 0 0 8 M W 7 9 W E N C H Umentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Geodetic inversion for source mechanism variations with application to the 2008 Mw7.9 Wenchuan earthquake

Zhang

Wang

2015

Geophysical Journal International

View full text Add to dashboard Cite

show abstract

“…In the joint inversion, the Helmert variance component estimation (HVCE) method (Xu et al, 2010) was applied to determine the relative weighting between InSAR and GPS data. The final weighting between InSAR and GPS convergences to 1:3.6, close to the value derived by Wang and Fialko (2015).…”

Section: Data Handling and Modeling Methodsmentioning

confidence: 99%

The 2015 Gorkha earthquake investigated from radar satellites: slip and stress modeling along the MHT

et al. 2015

View full text Add to dashboard Cite

“…Thus, we obtain more realistic models by discretizing the fault planes into sub-faults and solve for the slip on each patch, thereby allowing the slip to smoothly taper to zero towards the edges of the fault plane. We use the inversion code SDM [25] based on the constrained least-squares method, which has been used in a number of recent publications for analyzing GPS and InSAR coseismic deformation data (e.g., [26][27][28][29]). To overcome the problem of the non-uniqueness and instability of the inversion result, a smoothing constraint is applied to the slip distribution.…”

Section: Distributed Slip Modelmentioning

confidence: 99%

Source Parameters of the 2003–2004 Bange Earthquake Sequence, Central Tibet, China, Estimated from InSAR Data

Zhao

et al. 2016

Remote Sensing

View full text Add to dashboard Cite

A sequence of Ms ě 5.0 earthquakes occurred in 2003 and 2004 in Bange County, Tibet, China, all with similar depths and focal mechanisms. However, the source parameters, kinematics and relationships between these earthquakes are poorly known because of their moderately-sized magnitude and the sparse distribution of seismic stations in the region. We utilize interferometric synthetic aperture radar (InSAR) data from the European Space Agency's Envisat satellite to determine the location, fault geometry and slip distribution of three large events of the sequence that occurred on 7

show abstract

Coseismic Slip Distribution of the 2008 Mw 7.9 Wenchuan Earthquake from Joint Inversion of GPS and InSAR Data

Cited by 117 publications

References 46 publications

Geodetic inversion for source mechanism variations with application to the 2008 Mw7.9 Wenchuan earthquake

Geodetic inversion for source mechanism variations with application to the 2008 Mw7.9 Wenchuan earthquake

The 2015 Gorkha earthquake investigated from radar satellites: slip and stress modeling along the MHT

Source Parameters of the 2003–2004 Bange Earthquake Sequence, Central Tibet, China, Estimated from InSAR Data

Contact Info

Product

Resources

About