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Earth, Planets and Space

Table 3 Stratified model composed of elastic upper crust, viscoelastic lower crust and viscoelastic mantle

From: Insight into the 2017 Mainling Mw 6.5 earthquake: a complicated thrust event beneath the Namche Barwa syntaxis

Stratum

Depth (km)

P-wave velocity (km/s)

S-wave velocity (km/s)

Density (kg/m3)

Viscosity coefficient (Pa.s)

Crust

     

 Upper crust

0–31.15

6.00

3.52

2720

∞

 Lower crust

31.15–46.10

6.30

3.68

2790

Model 1: η = 1 × 1019

Model 2: η = 5 × 1019

Model 3: η = 1 × 1020

 

46.10–62.29

6.60

3.82

2850

 

 Upper mantle

62.29–150

8.25

4.57

3390

1 × 1020

  1. This study uses a relatively simple Maxwell body model to simulate the viscoelastic lower crust and upper mantle to reduce the uncertainty from more parameters in a more complicated model (Shan et al. 2013). The stratified parameters come from the crust 1.0. In the main calculation, the viscosity coefficients of the lower crust and upper mantle are set at 1 × 1019 Pa s and 1 × 1020 Pa s, respectively (model 1; Shan et al. 2013); the viscosity coefficients of the lower crust selected by model 2 and model 3 (Yin et al. 2018a) are used in stability analysis
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