scholarly journals UCERF3: A new earthquake forecast for California's complex fault system

Fact Sheet ◽  
2015 ◽  
Author(s):  
Edward H. Field ◽  
Keyword(s):  
Fault System ◽  
Earthquake Forecast ◽  
Complex Fault ◽  
Complex Fault System

scholarly journals Assembly of a large earthquake from a complex fault system: Surface rupture kinematics of the 4 April 2010 El Mayor–Cucapah (Mexico) Mw 7.2 earthquake

Geosphere ◽  
2014 ◽  
Vol 10 (4) ◽  
pp. 797-827 ◽  
Author(s):  
John M. Fletcher ◽  
Orlando J. Teran ◽  
Thomas K. Rockwell ◽  
Michael E. Oskin ◽  
Kenneth W. Hudnut ◽  
...  
Keyword(s):  
Large Earthquake ◽  
Fault System ◽  
Surface Rupture ◽  
Complex Fault ◽  
Rupture Kinematics ◽  
Complex Fault System

Revealing new hydrocarbon potential through Q-compensated prestack depth imaging at Wenchang Field, South China Sea

2019 ◽  
Vol 38 (8) ◽  
pp. 604-609
Author(s):  
Lin Li ◽  
Lie Li ◽  
Tao Xu ◽  
Min Ouyang ◽  
Yonghao Gai ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Hydrocarbon Exploration ◽  
Source Rocks ◽  
Fault System ◽  
Depth Image ◽  
Hydrocarbon Potential ◽  
China Sea ◽  
Complex Fault ◽  
Complex Fault System

Wenchang Field in the South China Sea contains a well-developed fault system, resulting in complex subsurface geology. Imaging the complex fault system plays an important role in hydrocarbon exploration in this area since the fault system forms a link between the source rocks and reservoirs. However, it is difficult to obtain a high-quality depth image of the fault system due to the effects of complex velocity and seismic absorption. Inaccurate depth velocities lead to fault shadows and structure distortions at the target zone. Absorption effects further deteriorate seismic imaging as they cause amplitude attenuation, phase distortion, and resolution reduction. We demonstrate how a combination of high-resolution depth velocity modeling and Q imaging work together to resolve these challenges. This workflow provides a step change in image quality of the complex fault system and targeted source rocks at Wenchang Field, significantly enhancing structure interpretation and reservoir delineation. A couple of commercial discoveries have been made, and several other potential hydrocarbon reservoirs have been identified based on the reprocessed data, which reveal new hydrocarbon potential in this region.

scholarly journals Source process for complex fault system of the 2007 Chuetsu-oki, Niigata, Japan, earthquake

2009 ◽  
Vol 61 (2) ◽  
pp. 273-278 ◽  
Author(s):  
Takeshi Nakamura ◽  
Yasushi Ishihara ◽  
Yoshiko Yamanaka ◽  
Yoshiyuki Kaneda
Keyword(s):  
Source Process ◽  
Fault System ◽  
Complex Fault ◽  
Complex Fault System

The 2016 Gyeongju earthquake sequence revisited: aftershock interactions within a complex fault system

2019 ◽  
Vol 217 (1) ◽  
pp. 58-74 ◽  
Author(s):  
Jeong-Ung Woo ◽  
Junkee Rhie ◽  
Seongryong Kim ◽  
Tae-Seob Kang ◽  
Kwang-Hee Kim ◽  
...  
Keyword(s):  
Earthquake Sequence ◽  
Fault System ◽  
Complex Fault ◽  
Gyeongju Earthquake ◽  
Complex Fault System

scholarly journals Late Pleistocene‐Holocene Slip Rate Along the Hasi Shan Restraining Bend of the Haiyuan Fault: Implication for Faulting Dynamics of a Complex Fault System

Tectonics ◽  
2019 ◽  
Vol 38 (12) ◽  
pp. 4127-4154
Author(s):  
R. Matrau ◽  
Y. Klinger ◽  
J. Van der Woerd ◽  
J. Liu‐Zeng ◽  
Z. Li ◽  
...  
Keyword(s):  
Late Pleistocene ◽  
Slip Rate ◽  
Fault System ◽  
Complex Fault ◽  
Restraining Bend ◽  
Complex Fault System

scholarly journals Complex rupture process of the 2014 Thailand Mw 6.2 earthquake on the conjugate fault system of the Phayao fault zone

2021 ◽  
Author(s):  
Tira Tadapansawut ◽  
Yagi Yuji ◽  
Ryo Okuwaki ◽  
Shinji Yamashita ◽  
Kousuke Shimizu
Keyword(s):  
Fault Zone ◽  
Fault Plane ◽  
Rupture Process ◽  
Fault System ◽  
Small Scale ◽  
Fault Geometry ◽  
Geological Setting ◽  
Complex Fault ◽  
Finite Fault ◽  
Complex Fault System

The earthquake with a moment magnitude 6.2 that occurred in northern Thailand on 5 May 2014 is the largest recorded in Thailand by modern seismographs; the source is located in the multi-segmented complex fault system of the Phayao fault zone in the northern Thai province of Chiang Rai. This geological setting is appropriate environment for investigating a compound rupture process associated with a geometrically complex fault system in a magnitude-6-class earthquake. To understand in detail the rupture process of the 2014 Thailand earthquake, we elaborate the flexible finite-fault inversion method, used it to invert the globally-observed teleseismic P waveforms, and resolved for the spatiotemporal distribution of both the slip and the fault geometry. The complex rupture process consists of two distinct coseismic slip episodes that evolved along two discontinuous fault planes; these planes coincide with the lineations of the aftershock distribution. The first episode originated at the hypocenter and the rupture propagated south along the north-northeast to south-southwest fault plane. The second episode was triggered at around 5 km north from the epicenter and the rupture propagated along the east-northeast to west-southwest fault plane and terminated at the west end of the source area at 4.5 s hypocentral time. The fault system derived from our finite-fault model suggests geometric complexities including bends. The derived spatiotemporal orientation of the principal stress axis shows different lineations within the two rupture areas and heterogeneity at their edges. This geological setting may have caused the perturbation of the rupture propagation and the triggering of the distinct rupture episodes. Our source model of the 2014 Thailand earthquake suggests that even in the case of small-scale earthquakes, the rupture evolution can be complex when the underlying fault geometry is multiplex.

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