气候变化领域集成服务门户(CCPortal): Large Holocene ruptures on the Cañada David detachment, Baja California, Mexico; implications for the seismogenesis of low-angle normal faults

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DOI	10.1016/j.epsl.2021.117070
	Large Holocene ruptures on the Cañada David detachment, Baja California, Mexico; implications for the seismogenesis of low-angle normal faults
	Karlsson K.W.; Rockwell T.K.; Fletcher J.M.; Figueiredo P.M.; Cambron Rosas J.F.; Gontz A.M.; Prasanajit Naik S.; Lacan P.; Spelz R.M.; Owen L.A.; Peña Villa I.A.; Loya R.L.
发表日期	2021
ISSN	0012821X
卷号	570
英文摘要	We present the results of detailed mapping and paleoseismic investigations along a section of the complex fault scarp array associated with the Cañada David detachment, a low-angle oblique normal fault that controls the southwestern flank of the Sierra El Mayor, Baja California, Mexico. We used high-resolution unmanned aerial vehicle imagery to map portions of a sequence of alluvial fans that comprise a bajada that flanks the southwestern range front. Their ages are distinguished based on a regional soil chronosequence. Three paleoseismic trenches were excavated across active surface faults that root into the Cañada David detachment at depth. Fine-grained stratigraphic units in the trenches were dated by optically stimulated luminescence techniques. The three trenches in this study show strong evidence for four large (Mw≥7) Holocene earthquakes at or just prior to about 1.7, 4.3–6.1, 7.7–7.6 and 8.4–10.7 ka, as well as weak to moderate evidence for two additional late Pleistocene earthquakes at or just prior to 12.7–14.1 ka and 15.2 ka, indicating an average recurrence of such events of ∼3 ka. This earthquake recurrence interval is slightly longer than that for the Laguna Salada fault to the north that flanks the Sierra Cucapah. The regular recurrence of major surface ruptures strongly suggests that severely-misoriented low-angle normal faults like the Cañada David detachment have a mechanical behavior that is very similar to other more optimally oriented faults suggesting that earthquakes on such faults should be common and may be difficult to recognize from seismologic methods due rolling-hinge ramps and/or multifault ruptures. © 2021 The Authors
关键词	coseismic scarps earthquake magnitude fault mechanics paleoseismic trenching recurrence interval surface rupture
英文关键词	Antennas; Fault slips; Luminescence; Stratigraphy; Baja california; Coseismic scarp; Earthquake magnitudes; Fault mechanics; Holocenes; Me-xico; Normal faults; Paleoseismic trenching; Recurrence intervals; Surface ruptures; Earthquakes; coseismic process; detachment fault; earthquake event; earthquake magnitude; earthquake rupture; ground motion; Holocene; normal fault; paleoseismicity; Baja California [(PNN) Mexico]; Mexico [North America]; Laguna
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203158
作者单位	Geological Sciences, San Diego State University, San Diego, CA 92182, United States; Pacific Gas & Electric Co., San Francisco, CA, United States; Departamento de Geología, Centro de Investigación Científica y de Educación Superior de Ensenada, Carretera Tijuana-Ensenada No. 3918, Zona Playitas, Ensenada, Baja California 22860, Mexico; Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, NC 27695, United States; Active Fault and Earthquake Hazard Mitigation Research Institute, Pukyong National University, Busan, 48513, South Korea; Centro de Geociencias, Universidad Nacional Autónoma de México, Blvd. Juriquilla, 3001, Juriquilla, Querétaro 76230, Mexico; Facultad de Ciencias Marinas, Universidad Autónoma de Baja California, Ensenada, Baja California, Mexico
推荐引用方式 GB/T 7714	Karlsson K.W.,Rockwell T.K.,Fletcher J.M.,et al. Large Holocene ruptures on the Cañada David detachment, Baja California, Mexico; implications for the seismogenesis of low-angle normal faults[J],2021,570.
APA	Karlsson K.W..,Rockwell T.K..,Fletcher J.M..,Figueiredo P.M..,Cambron Rosas J.F..,...&Loya R.L..(2021).Large Holocene ruptures on the Cañada David detachment, Baja California, Mexico; implications for the seismogenesis of low-angle normal faults.Earth and Planetary Science Letters,570.
MLA	Karlsson K.W.,et al."Large Holocene ruptures on the Cañada David detachment, Baja California, Mexico; implications for the seismogenesis of low-angle normal faults".Earth and Planetary Science Letters 570(2021).