干旱区生态环境知识资源中心(Arid): Kinematics and Evolution of the Southern Eastern California Shear Zone, Based on Analysis of Fault Strike, Distribution, Activity, Roughness, and Secondary Deformation

Arid

DOI	10.1029/2021TC006859
	Kinematics and Evolution of the Southern Eastern California Shear Zone, Based on Analysis of Fault Strike, Distribution, Activity, Roughness, and Secondary Deformation
	Spotila, James A.; Garvue, Max M.
通讯作者	Spotila, JA (corresponding author), Virginia Tech, Dept Geosci, Blacksburg, VA 24061 USA.
来源期刊	TECTONICS
ISSN	0278-7407
EISSN	1944-9194
出版年	2021
卷号	40 期号:11
英文摘要	The Eastern California shear zone is a complex set of dextral faults that accommodates significant plate motion and has produced large earthquakes. The evolution of this system and why it consists of closely spaced, irregular faults that fail in multi-fault ruptures are not well understood. Here we analyze the geometry, spatial distribution, and Quaternary slip activity of right-lateral faults in the southern Mojave block. We find these faults are oriented favorably for accommodating regional dextral plate motion and do not show evidence of replacement following counterclockwise rotation to unfavorable positions, although activity may be migrating westward as previously proposed. We also confirm that the shear zone is transpressive, with widespread restraining bends, distributed convergent deformation, and significant impact on near-fault topography. Observations also show that faults are geometrically complex, as represented by along-strike variability in fault strike. We document a correlation between strike variability and fault activity (slip rate or net slip), which is evident within the shear zone as well as for a control group of other faults. We suggest that strike variability represents a form of geometric roughness, which may inhibit fault slip and result in complex ruptures, slip-strengthening behavior, and a prevalence of off-fault deformation. Other factors, including preexisting crustal fabric, edge effects, and changes in the stress field, may further complicate kinematics. These results suggest that faults of the shear zone are still juvenile and somewhat unique, yet offer an important window into how broadly distributed shear may evolve into a through-going continental transform system.
英文关键词	Eastern California shear zone Mojave kinematics strike-slip active tectonics deformation
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000723093200009
WOS关键词	CENTRAL MOJAVE DESERT ; SAN-ANDREAS FAULT ; ALTYN TAGH FAULT ; TRANSIENT STRAIN ACCUMULATION ; SLIP-RATE DISCREPANCIES ; 1992 LANDERS EARTHQUAKE ; HECTOR MINE ; BERNARDINO MOUNTAINS ; TECTONIC ROTATION ; NORTH-AMERICA
WOS类目	Geochemistry & Geophysics
WOS研究方向	Geochemistry & Geophysics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/373794
作者单位	[Spotila, James A.; Garvue, Max M.] Virginia Tech, Dept Geosci, Blacksburg, VA 24061 USA
推荐引用方式 GB/T 7714	Spotila, James A.,Garvue, Max M.. Kinematics and Evolution of the Southern Eastern California Shear Zone, Based on Analysis of Fault Strike, Distribution, Activity, Roughness, and Secondary Deformation[J],2021,40(11).
APA	Spotila, James A.,&Garvue, Max M..(2021).Kinematics and Evolution of the Southern Eastern California Shear Zone, Based on Analysis of Fault Strike, Distribution, Activity, Roughness, and Secondary Deformation.TECTONICS,40(11).
MLA	Spotila, James A.,et al."Kinematics and Evolution of the Southern Eastern California Shear Zone, Based on Analysis of Fault Strike, Distribution, Activity, Roughness, and Secondary Deformation".TECTONICS 40.11(2021).