globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.117070
论文题名:
Large Holocene ruptures on the Cañada David detachment, Baja California, Mexico; implications for the seismogenesis of low-angle normal faults
作者: 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.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 570
语种: 英语
中文关键词: 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
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
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被引频次[WOS]:5   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165536
Appears in Collections:气候变化与战略

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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

Recommended Citation:
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]. Earth and Planetary Science Letters,2021-01-01,570
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