Estimation of GPS strain rate and its error analysis in the Chinese continent

Zhu, Shoubiao

doi:10.1016/j.jseaes.2010.06.007

Cited by 38 publications

(28 citation statements)

References 22 publications

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“…For the strain rate (Table ) we use a uniform value of 1×10 −15 s −1 , which is commonly observed in most part of the study region [ Zhu and Shi , ] and thus is suitable to estimate first‐order strength variations. However, the strain rates may vary of about 2 orders of magnitude in the areas characterized by fast or slow deformation [e.g., Kreemer et al ., ].…”

Section: Methodsmentioning

confidence: 99%

Lithospheric strength variations in Mainland China: Tectonic implications

Deng

Tesauro

2016

Tectonics

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We present a new thermal and strength model for the lithosphere of Mainland China. To this purpose, we integrate a thermal model for the crust, using a 3‐D steady state heat conduction equation, with estimates for the upper mantle thermal structure, obtained by inverting a S wave tomography model. With this new thermal model and assigning to the lithospheric layers a “soft” and “hard” rheology, respectively, we estimate integrated strength of the lithosphere. In the Ordos and the Sichuan basins, characterized by intermediate temperatures, strength is primarily concentrated in the crust, when the rheology is soft, and in both the crust and upper mantle, when the rheology is hard. In turn, the Tibetan Plateau and the Tarim basin have a weak and strong lithosphere mainly on account of their high and low temperatures, respectively. A comparison of temperatures, strength, and effective viscosity variations with earthquakes distribution and their seismic energy released indicates that both the deep part of the crust and the upper mantle of the Tibetan Plateau are weak and prone to flow toward adjacent areas. The high strength of some of the tectonic domains surrounding Tibet (Tarim, Ordos, and Sichuan basins) favors the flow toward the weak western part of South China block.

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Section: Methodsmentioning

confidence: 99%

Lithospheric strength variations in Mainland China: Tectonic implications

Deng

Tesauro

2016

Tectonics

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“…In addition, focal mechanisms of earthquakes obtained from global CMT (http://www.globalcmt. org/), strain rates computed from GPS observation (ZHU and SHI 2011), and in situ borehole stress measurements in which the stress regime is S Hmax [ S Hmin [ S v with the maximum horizontal compressive stress of 9.8 MPa oriented N51°W around the Lushan epicenter (WU et al 2009), will help us to ascertain the regional stresses in the DCFS computation. Moreover, WU et al (2009) presented that the stress level around the southwestern segment of the Longmen Shan fault was observed to be relatively high after the 2008 Wenchuan earthquake.…”

Section: Coseismic Static Stress Triggering Of Aftershocksmentioning

confidence: 99%

How Did the 2013 Lushan Earthquake (Ms = 7.0) Trigger its Aftershocks? Insights from Static Coulomb Stress Change Calculations

Zhu

Miao

2015

Pure Appl. Geophys.

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The Lushan earthquake Ms7.0 occurred at 08:02 Beijing Time (00:02 UTC) on 20 April 2013, located on the eastern margin of the Tibetan Plateau, where the 2008 Ms8.0 Wenchuan earthquake took place. The other strong shock following the Wenchuan earthquake occurred on the Longmen Shan thrust fault. A large number of aftershocks were recorded after the mainshock. To investigate how the aftershocks were triggered, we firstly relocated the 6-month aftershock sequence by the double-difference algorithm. Next, we calculated Coulomb failure stress changes imparted by the Lushan mainshock both on the optimally oriented plane and on the aftershock nodal planes. Then we examined the correspondence between the Coulomb failure stress changes and the spatial distribution of the aftershocks. The computed results show that most of the aftershock hypocenters did not occur on the region with the positive Coulomb stress changes caused by the Lushan mainshock. Moreover, the majority of aftershock nodal planes were brought away from failure by coseismic Coulomb stresses. This implies that coseismic static Coulomb stress changes may not be the governing process for aftershock genesis. In contrast, postseismic stress transfer by processes of afterslip and pore fluid flow are assumed to play an important part in aftershock triggering, based upon the spatiotemporal distribution of the aftershocks.

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“…Several of the studies focus on areas locally (i.e., Allmendinger et al, 2007;Ge et al, 2015;Wang & Wright, 2012;Zhang et al, 2004Zhang et al, , 2018 and others more broadly (i.e., Kreemer et al, 2014;Zheng et al, 2017;Zhu & Shi, 2011). To depict the strain rate pattern of the whole area of mainland China, Zhu and Shi (2011) utilize sparse GPS data only from 1999 to 2005. Kreemer et al (2014) incorporate most of the published velocities of China during 1999-2013 into the Global Strain Rate Model v2.1.…”

Section: Introductionmentioning

confidence: 99%

A Geodetic Strain Rate and Tectonic Velocity Model for China

Xiao

Stamps

2019

Geochem Geophys Geosyst

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The conjoining and interfering influence of the Circum‐Pacific zone and the Tethys‐Himalayan zone make China a country of intense intracontinental seismicity. Here we provide three new quantitatively assessed products and use them to better constrain seismic hazards in China. First, we process ~2,700 Global Positioning System (GPS) data spanning 1996–2017 provided by the Crustal Movement Observation Network of China (CMONOC) network and the Nevada Geodetic Laboratory. To produce a robust tectonic velocity solution, we implement a data editing scheme to account for 8 Mw ≥ 7 earthquakes to reduce the influence of transient phenomena. The solution is then rotated into a consistent reference frame with 10 other published velocity sources surrounding mainland China. Second, we calculate a new geodetic strain rate model using an optimal mesh grid definition of 0.4° × 0.4° determined jointly by the Nyquist frequency method and checkerboard tests. We evaluate and validate the geodetic strain rate results from both a statistical (i.e., based on the Bayesian factor) and quantitative (i.e., based on the comparison with the 2‐D analytical strain rate result) approaches. Third, we use our new geodetic strain rate model to estimate seismicity rates.

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Estimation of GPS strain rate and its error analysis in the Chinese continent

Cited by 38 publications

References 22 publications

Lithospheric strength variations in Mainland China: Tectonic implications

Lithospheric strength variations in Mainland China: Tectonic implications

How Did the 2013 Lushan Earthquake (Ms = 7.0) Trigger its Aftershocks? Insights from Static Coulomb Stress Change Calculations

A Geodetic Strain Rate and Tectonic Velocity Model for China

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