干旱区生态环境知识资源中心(Arid): Seismostratigraphic analysis of Lake Cahuilla sedimentation cycles and fault displacement history beneath the Salton Sea, California, USA

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DOI	10.1130/GES02468.1
	Seismostratigraphic analysis of Lake Cahuilla sedimentation cycles and fault displacement history beneath the Salton Sea, California, USA
	Brothers, Daniel S.; Driscoll, Neal W.; Kent, Graham M.; Baskin, Robert L.; Harding, Alistair J.; Kell, Annie M.
通讯作者	Brothers, DS
来源期刊	GEOSPHERE
ISSN	1553-040X
出版年	2022
卷号	18 期号:4 页码:1354-1376
英文摘要	The Salton Trough (southeastern California, USA) is the northernmost transtensional stepover of the Gulf of California oblique-divergent plate boundary and is also where the southern terminus of the San Andreas fault occurs. Until recently, the distribution of active faults in and around the Salton Sea and their displacement histories were largely unknown. Subbottom CHIRP (compressed high-intensity radar pulse) surveys in the Salton Sea are used to develop a seismic facies model for ancient Lake Cahuilla deposits, a detailed map of submerged active faults, and reconstructed fault displacement histories during the late Holocene. We observe as many as fourteen Lake Cahuilla sequences in the Salton Sea (last similar to 3 k.y.) and develop a chronostratigraphic framework for the last six sequences (last similar to 1200 yr) by integrating CHIRP data and cone penetrometer logs with radiocarbon-dated stratigraphy at an onshore paleoseismic site. The Salton Sea contains northern and southern subbasins that appear to be separated by a tectonic hinge zone, and a subsidence signal across hinge-zone faults of 6-9 mm/yr (since ca. A.D. 940) increases toward the south to >15 mm/yr. The faults mapped to the south of the hinge zone appear to accommodate transtension within the San Andreas-Imperial fault stepover. We identify 8-15 distinct growth events across hinge-zone faults, meaning growth occurred at least once every 100 yr since Lake Cahuilla sedimentation began. Several faults offset the top of the most recent Lake Cahuilla highstand deposits, and at least two faults have offset the Salton Sea flood deposits. Active faults and folds were also mapped to a limited extent within the northern subbasin and display growth, but their kinematics and rupture histories require further study. The broad distribution of active faulting suggests that strain between the San Andreas, San Jacinto, and Imperial faults is highly distributed, thus discrepancies between geologic and geodetic slip-rate estimates from these major fault systems are to be expected.
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000815134300001
WOS关键词	SAN-ANDREAS FAULT ; 1987 SUPERSTITION HILLS ; BRAWLEY EARTHQUAKE SWARM ; MISSION CREEK STRAND ; IMPERIAL-VALLEY ; SOUTHERN CALIFORNIA ; SURFACE RUPTURES ; JACINTO FAULT ; DURMID HILL ; PALMS OASIS
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/392958
推荐引用方式 GB/T 7714	Brothers, Daniel S.,Driscoll, Neal W.,Kent, Graham M.,et al. Seismostratigraphic analysis of Lake Cahuilla sedimentation cycles and fault displacement history beneath the Salton Sea, California, USA[J],2022,18(4):1354-1376.
APA	Brothers, Daniel S.,Driscoll, Neal W.,Kent, Graham M.,Baskin, Robert L.,Harding, Alistair J.,&Kell, Annie M..(2022).Seismostratigraphic analysis of Lake Cahuilla sedimentation cycles and fault displacement history beneath the Salton Sea, California, USA.GEOSPHERE,18(4),1354-1376.
MLA	Brothers, Daniel S.,et al."Seismostratigraphic analysis of Lake Cahuilla sedimentation cycles and fault displacement history beneath the Salton Sea, California, USA".GEOSPHERE 18.4(2022):1354-1376.