DOI: 10.1016/j.epsl.2019.115907
论文题名: Late Quaternary slip rate of the Central Sierra Madre fault, southern California: Implications for slip partitioning and earthquake hazard
作者: Burgette R.J. ; Hanson A.M. ; Scharer K.M. ; Rittenour T.M. ; McPhillips D.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 530 语种: 英语
中文关键词: 10Be surface exposure dating
; lidar
; p-IR IRSL luminescence dating
; reverse faulting
; seismic cycle deformation
; terraces
英文关键词: Budget control
; Deformation
; Earthquakes
; Geochronology
; Geodesy
; Hazards
; Luminescence
; Optical radar
; Strike-slip faults
; Topography
; Uncertainty analysis
; Geomorphic position
; Luminescence dating
; Multiple structures
; Paleoseismic evidence
; Reverse faulting
; Southern California
; Surface exposure dating
; terraces
; Fault slips
; beryllium isotope
; deformation
; lidar
; luminescence dating
; Quaternary
; reverse fault
; seismic hazard
; seismicity
; slip rate
; terrace
; California
; Rocky Mountains
; Sierra Madre [United States]
; United States
英文摘要: The Sierra Madre fault system accommodates contraction within a large restraining bend area of the San Andreas fault along the northern margin of the Los Angeles metropolitan area in southern California. Reverse slip along this fault system during earthquakes controls growth of the San Gabriel Mountains and poses a significant seismic hazard to the region. Here, we measure the late Quaternary slip rate of the Central Sierra Madre fault (CSMF) using analysis of high-resolution topography combined with cosmogenic 10Be surface exposure dating and post-IR IRSL geochronology. We mapped terrace and fan surfaces from three drainages that cross the CSMF and correlate them based on deposit character and geomorphic position. Cosmogenic nuclide and luminescence ages are consistent amongst the three prominent surfaces offset ∼5 to 28 m across the fault zone. Age estimates for these surfaces are 53 +21/−15 ka, 35 ± 9 ka, and 12±5 ka based on data from two dating methods at three locations, refined by inset age relationships. Estimated slip for these geomorphic markers is more uncertain than the measured vertical separation due to uncertainties in fault dip and ranges from 7.5 +5.4/−3.1 m to 58.5 +46.3/−14.4 m. Incremental dip-slip rate estimates from different age surfaces and locations overlap within uncertainty, with median values ranging from 0.6 to 1.1 mm/yr. The average slip rate for all three generations of markers is 1.1 +1.1/−0.4 mm/yr. This late Quaternary slip rate for the CSMF is slower than estimates based on interseismic geodetic data, and emphasizes the importance of contraction distributed across multiple structures south of the Sierra Madre fault when assessed against the geodetic shortening budget. Despite being the central portion of the broader Sierra Madre fault system, the CSMF has a slip rate similar to or lower than neighboring sections, suggesting that slip transfer onto other nearby faults control the along-strike pattern of deformation rate. Paleoseismic evidence indicates that the last earthquake on the CSMF was in the early Holocene, and the slip rate we estimate suggests that the accumulated elastic strain could produce many meters of slip in future earthquakes. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164895
Appears in Collections: 气候变化与战略
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作者单位: Department of Geological Sciences, New Mexico State University, Las Cruces, NM 88003, United States; U.S. Geological Survey, 525 S. Wilson Ave, Pasadena, CA 91104, United States; Department of Geology, Utah State University, Logan, UT 84322, United States
Recommended Citation:
Burgette R.J.,Hanson A.M.,Scharer K.M.,et al. Late Quaternary slip rate of the Central Sierra Madre fault, southern California: Implications for slip partitioning and earthquake hazard[J]. Earth and Planetary Science Letters,2020-01-01,530