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A Kinematic Fault Network Model for Crustal Deformation (including seismicity of optimal locking depth, shallow surface creep and geological constraints)

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Presentation on theme: "A Kinematic Fault Network Model for Crustal Deformation (including seismicity of optimal locking depth, shallow surface creep and geological constraints)"— Presentation transcript:

1 A Kinematic Fault Network Model for Crustal Deformation (including seismicity of optimal locking depth, shallow surface creep and geological constraints) Yuehua Zeng and Zhengkang Shen

2 Elastic dislocation theory Locked near the surface. Slip at constant rate below transition depth Locking Depth

3 For a given slip distribution on all the faults, the ground deformation vector at any point is obtained by taking a spatial convolution of the static point source Green's function with the fault slip function: where  is the shear modulus, i is a unit vector normal to the fault,  u j is the j-th component of slip on the fault, and G ni is the Green's function calculated from receiver to source. x is a vector describing the receiver location and  is a vector describing the corresponding source point where the Green's function is calculated. 1) assuming fault segments slip at certain rates beneath a locking depth 2) locking depths are defined by local seismicity depth distributions 3) slip vector conservation imposed at fault nodes or intersections 4) depth dependent aseismic creeps

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6 GPS only

7 With geological constraints geological rates

8 Comparison of geodetic and seismicity locking depth

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11 UCERF 3 Testing Block model (with/without seismicity depth, shallow surface creep and geological constraints)

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14 Fixed depth of 15 km, no creep, no geological constraints

15 Seismicity depth, no creep, no geological constraints

16 Seismicity depth, creep, geological constraints

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18 Fixed depth of 15 km, no creep, no geological constraints

19 Seismicity depth, no creep, no geological constraints

20 Seismicity depth, creep, geological constraints

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22 Fixed depth, no creep, and no geological constraints Seismicity depth, no creep, and no geological constraints Seismicity depth, creep, and geological constraints

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24 Fixed depth of 15 km, no creep, no geological constraints

25 Seismicity depth, no creep, no geological constraints

26 Seismicity depth, creep, geological constraints

27 UCERF 2 Model and Its Comparison with the Testing Block model (both with seismicity depth, shallow surface creep and geological constraints)

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