Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1130/GES00933.1 |
Assembly of a large earthquake from a complex fault system: Surface rupture kinematics of the 4 April 2010 El Mayor-Cucapah (Mexico) M-w 7.2 earthquake | |
Fletcher, John M.1; Teran, Orlando J.1; Rockwell, Thomas K.2; Oskin, Michael E.3; Hudnut, Kenneth W.4; Mueller, Karl J.5; Spelz, Ronald M.6; Akciz, Sinan O.7; Masana, Eulalia8; Faneros, Geoff2; Fielding, Eric J.9; Leprince, Sebastien10; Morelan, Alexander E.3; Stock, Joann10; Lynch, David K.4; Elliott, Austin J.3; Gold, Peter3; Liu-Zeng, Jing11; Gonzalez-Ortega, Alejandro1; Hinojosa-Corona, Alejandro1; Gonzalez-Garcia, Javier1 | |
通讯作者 | Fletcher, John M. |
来源期刊 | GEOSPHERE
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ISSN | 1553-040X |
出版年 | 2014 |
卷号 | 10期号:4页码:797-827 |
英文摘要 | The 4 April 2010 moment magnitude (M-w) 7.2 El Mayor-Cucapah earthquake revealed the existence of a previously unidentified fault system in Mexico that extends similar to 120 km from the northern tip of the Gulf of California to the U.S.-Mexico border. The system strikes northwest and is composed of at least seven major faults linked by numerous smaller faults, making this one of the most complex surface ruptures ever documented along the Pacific-North America plate boundary. Rupture propagated bilaterally through three distinct kinematic and geomorphic domains. Southeast of the epicenter, a broad region of distributed fracturing, liquefaction, and discontinuous fault rupture was controlled by a buried, southwest-dipping, dextral-normal fault system that extends similar to 53 km across the southern Colorado River delta. Northwest of the epicenter, the sense of vertical slip reverses as rupture propagated through multiple strands of an imbricate stack of east-dipping dextral-normal faults that extend similar to 55 km through the Sierra Cucapah. However, some coseismic slip (10-30 cm) was partitioned onto the west-dipping Laguna Salada fault, which extends parallel to the main rupture and defines the western margin of the Sierra Cucapah. In the northernmost domain, rupture terminates on a series of several north-northeast-striking cross-faults with minor offset (<8 cm) that cut uplifted and folded sediments of the northern Colorado River delta in the Yuha Desert. In the Sierra Cucapah, primary rupture occurred on four major faults separated by one fault branch and two accommodation zones. The accommodation zones are distributed in a left-stepping en echelon geometry, such that rupture passed systematically to structurally lower faults. The structurally lowest fault that ruptured in this event is inclined as shallowly as similar to 20. Net surface offsets in the Sierra Cucapah average similar to 200 cm, with some reaching 300-400 cm, and rupture kinematics vary greatly along strike. Nonetheless, instantaneous extension directions are consistently oriented similar to 085 and the dominant slip direction is similar to 310, which is slightly (similar to 10) more westerly than the expected azimuth of relative plate motion, but considerably more oblique to other nearby historical ruptures such as the 1992 Landers earthquake. Complex multifault ruptures are common in the central portion of the Pacific North American plate margin, which is affected by restraining bend tectonics, gravitational potential energy gradients, and the inherently three-dimensional strain of the transtensional and transpressional shear regimes that operate in this region. |
类型 | Article |
语种 | 英语 |
国家 | Mexico ; USA ; Spain ; Peoples R China |
收录类别 | SCI-E |
WOS记录号 | WOS:000339961500010 |
WOS关键词 | SAN-ANDREAS FAULT ; GULF-OF-CALIFORNIA ; AMERICA PLATE BOUNDARY ; LAGUNA-SALADA FAULT ; BAJA-CALIFORNIA ; SOUTHERN CALIFORNIA ; LOW-ANGLE ; LANDERS EARTHQUAKE ; SALTON TROUGH ; NORTHERN BAJA |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
来源机构 | United States Geological Survey ; University of California, Davis ; University of California, Los Angeles |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/182320 |
作者单位 | 1.Ctr Inves Cient & Educ Super Ensenada, Dept Geol, Ensenada 22860, Baja California, Mexico; 2.San Diego State Univ, Dept Geol Sci, San Diego, CA 92182 USA; 3.Univ Calif Davis, Dept Earth & Planetary Sci, Davis, CA 95616 USA; 4.US Geol Survey, Pasadena, CA 91106 USA; 5.Univ Colorado, Dept Geol Sci, Boulder, CO 80309 USA; 6.Univ Autonoma Baja California, Fac Ciencias Marinas, Ensenada 22860, Baja California, Mexico; 7.Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA 90095 USA; 8.Univ Barcelona, Dept Geodinam & Geofis, E-08028 Barcelona, Spain; 9.CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA; 10.CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA; 11.China Earthquake Adm, Inst Geol, State Key Lab Earthquake Dynam, Beijing 100029, Peoples R China |
推荐引用方式 GB/T 7714 | Fletcher, John M.,Teran, Orlando J.,Rockwell, Thomas K.,et al. Assembly of a large earthquake from a complex fault system: Surface rupture kinematics of the 4 April 2010 El Mayor-Cucapah (Mexico) M-w 7.2 earthquake[J]. United States Geological Survey, University of California, Davis, University of California, Los Angeles,2014,10(4):797-827. |
APA | Fletcher, John M..,Teran, Orlando J..,Rockwell, Thomas K..,Oskin, Michael E..,Hudnut, Kenneth W..,...&Gonzalez-Garcia, Javier.(2014).Assembly of a large earthquake from a complex fault system: Surface rupture kinematics of the 4 April 2010 El Mayor-Cucapah (Mexico) M-w 7.2 earthquake.GEOSPHERE,10(4),797-827. |
MLA | Fletcher, John M.,et al."Assembly of a large earthquake from a complex fault system: Surface rupture kinematics of the 4 April 2010 El Mayor-Cucapah (Mexico) M-w 7.2 earthquake".GEOSPHERE 10.4(2014):797-827. |
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