DOI: 10.1038/ngeo2741
论文题名: The vertical fingerprint of earthquake cycle loading in southern California
作者: Howell S. ; Smith-Konter B. ; Frazer N. ; Tong X. ; Sandwell D.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期: 8 起始页码: 611
结束页码: 614
语种: 英语
Scopus关键词: crust
; deformation mechanism
; GPS
; numerical model
; plate boundary
; San Andreas Fault
; seismic hazard
; subsidence
; uplift
; vertical movement
; California
; United States
英文摘要: The San Andreas Fault System, one of the best-studied transform plate boundaries on Earth, is well known for its complex network of locked faults that slowly deform the crust in response to large-scale plate motions. Horizontal interseismic motions of the fault system are largely predictable, but vertical motions arising from tectonic sources remain enigmatic. Here we show that when carefully treated for spatial consistency, global positioning system-derived vertical velocities expose a small-amplitude (±2 mm yr -1), but spatially considerable (200 km), coherent pattern of uplift and subsidence straddling the fault system in southern California. We employ the statistical method of model selection to isolate this vertical velocity field from non-tectonic signals that induce velocity variations in both magnitude and direction across small distances (less than tens of kilometres; ref.), and find remarkable agreement with the sense of vertical motions predicted by physical earthquake cycle models spanning the past few centuries. We suggest that these motions reveal the subtle, but identifiable, tectonic fingerprint of far-field flexure due to more than 300 years of fault locking and creeping depth variability. Understanding this critical component of interseismic deformation at a complex strike-slip plate boundary will better constrain regional mechanics and crustal rheology, improving the quantification of seismic hazards in southern California and beyond. © 2016 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105954
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Department of Geology and Geophysics, SOEST, University of Hawai'i at Manoa, Honolulu, HI, United States; Department of Earth and Space Sciences, University of Washington, Seattle, WA, United States; Scripps Institute of Oceanography, University of California San Diego, San Diego, CA, United States
Recommended Citation:
Howell S.,Smith-Konter B.,Frazer N.,et al. The vertical fingerprint of earthquake cycle loading in southern California[J]. Nature Geoscience,2016-01-01,9(8)