An integrated analysis of source parameters, seismogenic structure, and seismic hazards related to the 2014 MS 6.3 Kangding earthquake, China

2017 ◽  
Vol 712-713 ◽  
pp. 1-9 ◽  
Author(s):  
Zujun Xie ◽  
Yong Zheng ◽  
Chengli Liu ◽  
Bin Shan ◽  
Muhammad Shahid Riaz ◽  
...  
Keyword(s):  
Source Parameters ◽  
Seismic Hazards ◽  
Integrated Analysis ◽  
Seismogenic Structure

The 2020 Mw 6.0 Jiashi Earthquake: A Fold Earthquake Event in the Southern Tian Shan, Northwest China

2020 ◽  
Author(s):  
Yuan Yao ◽  
Shaoyan Wen ◽  
Tao Li ◽  
Chisheng Wang
Keyword(s):  
Seismic Reflection ◽  
Fault Plane ◽  
Leading Edge ◽  
Northwest China ◽  
Coseismic Deformation ◽  
Slip Angle ◽  
Integrated Analysis ◽  
Seismogenic Structure ◽  
Seismic Reflection Profiles ◽  
Tian Shan

Abstract The complexity of the coseismic rupture process of active thrust faults and the limitation of the 3D geometry of the fault plane play important roles in seismic risk assessment. The 2020 Mw 6.0 Jiashi earthquake is an example of seismic events that have occurred in the Kepingtage fold-and-thrust belt (FTB) in the southern Tian Shan belt. Integrated analysis of surface geology, topography, and seismic reflection profiles has delineated the surface and subsurface geometries of the Keping thrust fault (KPT). Combined with the focal mechanism, seismic reflection profiles, and Interferometric Synthetic Aperture Radar coseismic deformation, we are able to reveal the seismogenic structure of this earthquake. The Jiashi event was mainly a horizontal compression deformation; the sliding distribution was concentrated at a depth of 4–6 km, and the fault-slip angle was ∼15°. Our results show that the seismogenic structure of the Jiashi event was the KPT at the leading edge of the Kepingtage FTB. The fault plane is separated at depth by a horizontal detachment, with an upper (∼30°) and lower (∼15°) ramp. The coseismic rupture of the Jiashi event was constrained within the lower ramp. This event is a good example that readily explains why the Kepingtage FTB is characterized by moderate-magnitude (Mw 6.0–6.5) events.

Source Parameters of the 2014Ms 6.5 Ludian Earthquake Sequence and Their Implications on the Seismogenic Structure

2015 ◽  
Vol 86 (6) ◽  
pp. 1614-1621 ◽  
Author(s):  
Zujun Xie ◽  
Yong Zheng ◽  
Chengli Liu ◽  
Xiong Xiong ◽  
Yongdong Li ◽  
...  
Keyword(s):  
Source Parameters ◽  
Earthquake Sequence ◽  
Seismogenic Structure ◽  
Ludian Earthquake

Coupled Poroelastic Modeling to Characterize the 4.18-Magnitude Earthquake Due to Hydraulic Fracturing in the East Shale Basin of Western Canada

2021 ◽  
Author(s):  
Gang Hui ◽  
Shengnan Chen ◽  
Fei Gu
Keyword(s):  
Hydraulic Fracturing ◽  
Solid Mechanics ◽  
Flow Behavior ◽  
Seismic Hazards ◽  
Integrated Analysis ◽  
Western Canada ◽  
Induced Earthquakes ◽  
Fault Activation ◽  
Coulomb Failure ◽  
Poroelastic Modeling

Abstract Recently, the elevated levels of seismicity activities in Western Canada have been demonstrated to be linked to hydraulic fracturing operations that developed unconventional resources. The underlying triggering mechanisms of hydraulic fracturing-induced seismicity are still uncertain. The interactions of well stimulation and geology-geomechanical-hydrological features need to be investigated comprehensively. The linear poroelasticity theory was utilized to guide coupled poroelastic modeling and to quantify the physical process during hydraulic fracturing. The integrated analysis is first conducted to characterize the mechanical features and fluid flow behavior. The finite-element simulation is then conducted by coupling Darcy's law and solid mechanics to quantify the perturbation of pore pressure and poroelastic stress in the seismogenic fault zone. Finally, the Mohr-coulomb failure criterion is utilized to determine the spatial-temporal faults activation and reveal the trigger mechanisms of induced earthquakes. The mitigation strategy was proposed accordingly to reduce the potential seismic hazards near this region. A case study of ML 4.18 earthquake in the East Shale Basin was utilized to demonstrate the applicability of the coupled modeling and numerical simulation. Results showed that one inferred fault cut through the Duvernay formation with the strike of NE20°. The fracture half-length of two wells owns an average value of 124 m. The brittleness index deriving from the velocity logging data was estimated to be a relatively higher value in the Duvernay formation, indicating a geomechanical bias of stimulated formation for the fault activation. The coupled poroelastic simulation was conducted, showing that the hydrologic connection between seismogenic faults and stimulated well was established by the end of the 38th stage completion for the east horizontal well. The simulated coulomb failure stress surrounding the fault reached a maximum of 4.15 MPa, exceeding the critical value to cause the fault slip. Hence the poroelastic effects on the inferred fault were responsible for the fault activation and triggered the subsequent ML 4.18 earthquake. It is essential to optimize the stimulation site selection near the existing faults to reduce risks of future seismic hazards near the East Shale Basin.

Seismic Hazard Assessment of the Mid-Northern Segment of Xiaojiang Fault Zone in Southwestern China Using Scenario Earthquakes

2020 ◽  
Vol 110 (3) ◽  
pp. 1191-1210
Author(s):  
Jingwei Liu ◽  
Lifang Zhang ◽  
Yi Du
Keyword(s):  
Fault Zone ◽  
Source Parameters ◽  
Seismic Hazards ◽  
Ground Acceleration ◽  
Activity Data ◽  
Finite Fault ◽  
Scenario Earthquakes ◽  
Xiaojiang Fault ◽  
Large Earthquakes ◽  
Northern Segment

ABSTRACT Seismic hazards in the vicinity of the mid-northern segment of the Xiaojiang fault zone were estimated from scenario earthquakes. Based on its history of earthquakes and activity data, the whole segment is considered capable of generating large earthquakes. The characteristics of previous ruptures and the geometric structures of the fault were used to establish seven scenario earthquakes with various strike and length properties. On the basis of focal mechanism parameters and the distribution of previous earthquakes, we determined the values of the source parameters for each scenario using empirical equations. We then used a stochastic finite-fault model to generate the ground motion from the targeted fault. The results show that the vicinity of the mid-northern segment of the Xiaojiang fault zone faces significant seismic hazards. The peak ground acceleration (PGA) values along the fault line are obviously larger than in other areas. Based on the recurrence interval theory, the Qiaojia–Menggu and Xiaoxinjie–Xujiadu areas have a high probability of being struck by large earthquakes in the near future. The results also show that the current design PGA for the near-fault area of the mid-northern segment of Xiaojiang fault zone might not be adequate.

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