Geosphere 投稿模板-刊鹿论文编译

Slip history and the role of the Agua Blanca fault in the tectonics of the North American–Pacific plate boundary of southern California, USA and Baja California, Mexico

Abstract:

The Agua Blanca fault (ABF) is a west-northwest–trending oblique dextralnormal fault that defines the southern boundary of the Big Bend domain (BBD) of the Pacific–North American plate margin and the northern limit to the rigid Baja California microplate. Our geologic and geodetic studies demonstrate that finite slip on the ABF reaches a maximum of ~11 km of nearly pure dextral strike slip in central portions of the fault, whereas the magnitude of displacement decreases and the proportion of extension increases in the sections to both the east and west. To the east, the ABF appears to die out before crossing into the San Pedro Mártir fault, with slip transferred onto a series of more northerlytrending, dip-slip faults. To the west, the ABF bifurcates to form the Santo Tomás fault (STF) in the Valle Santo Tomás section, where we measure ~5 km of dextral offset for the ABF and ~3 km estimated offset on the STF. And we report a measurement of ~7 km of dextral offset on the ABF in the Punta Banda section. Small offset faults proximal to the ABF likely accommodate additional dextral shear in the western sections of the fault. The STF in the Valle Santo Tomás section and the ABF in the Punta Banda section exhibit 0.58 and 0.65 km of extensional heave, or ~7% and 10% of the total displacement in each section, respectively. Block modeling based on geodetic data agrees well with geologic determinations of slip direction and reveals near perfect alignment of the central ABF with the relative block motion vectors and increased proportions of fault-perpendicular extension to both the east (3%–10%) and west (5%–13%). Based on our new estimates of the total offsets combined with existing slip rates, the ABF likely initiated between 3.3 and 1.5 Ma. This age range overlaps with those reported for other faults within the area of the BBD southwest of the San Andreas fault. The ABF has a more westerly orientation than the transpressional restraining-bend segment of the San Andreas, yet it accommodates transtensional shearing. This requires a reevaluation of the processes that control transpression and transtension within the BBD. INTRODUCTION The North American–Pacific plate boundary through the United States and Mexico is composed of a complex system of faults whose kinematics and geographic distributions allow for a subdivision into three domains (Fig. 1; Fletcher et al., 2014). From north to south, these include the San Andreas, Big Bend, and Gulf of California domains. The San Andreas domain includes the San Andreas fault (SAF) along with an anastomosing network of faults following the central California coast and includes domains of partitioned plate motion in the Walker Lane, Great Basin, and Rio Grande rift. The Big Bend domain (BBD), located between the Garlock fault and the Agua Blanca fault (ABF), is composed of a network of faults stretching across a ~500-km-wide region with the SAF at its approximate center. The faults of the Mojave section of the Eastern California shear zone (ECSZ) are present to the northeast, and a network of faults identified by Legg et al. (1991) as the Southern California shear zone (SCSZ) is present to the southwest of the SAF. The SCSZ predominantly consists of northwest-trending dextral strike-slip faults that initiated in the Quaternary (e.g., Steely et al., 2009; Janecke et al., 2010; Dorsey et al., 2012). The Gulf of California domain, located to the south of the ABF, includes a suite of en echelon transform faults with short spreading centers in the steps. Unlike the two northern domains, the vast majority of the plate boundary shear (~90%; Plattner et al., 2007, 2009) is confined to these transform faults. The remaining plate motion in this domain is accommodated by active faults west of the Baja California microplate (Plattner et al., 2007, 2009). The ABF defines the northern limit of the Baja California microplate and the southern limit of the BBD. It is a unique structure within the North American–Pacific plate boundary zone of southern and Baja California in that it is a predominantly dextral strike-slip fault (e.g., Allen et al., 1960 and this study) with a trace oriented at a high angle (276° to 302°) to the regional maximum horizontal compressive stress (Fig. 1; Townend and Zoback, 2004). Its strike is, GEOSPHERE GEOSPHERE; v. 15, no. 1 https://doi.org/10.1130/GES01670.1 12 figures; 4 tables CORRESPONDENCE: wetmore @usf .edu CITATION: Wetmore, P.H., Malservisi, R., Fletcher, J.M., Alsleben, H., Wilson, J., Callihan, S., Springer, A., González-Yajimovich, O., and Gold, P.O., 2019, Slip history and the role of the Agua Blanca fault in the tectonics of the North American–Pacific plate boundary of southern California, USA and Baja California, Mexico: Geosphere, v. 15, no. 1, p. 119–145, https:// doi .org /10 .1130 /GES01670.1. Science Editor: Raymond M. Russo Associate Editor: Jose Miguel Hurtado Received 11 January 2018 Revision received 5 June 2018 Accepted 3 October 2018 Published online 5 December 2018

Author Listing： Paul H. Wetmore;Rocco Malservisi;John M. Fletcher;Helge Alsleben;James Wilson;Sean Callihan;Adam Springer;Oscar González-Yajimovich;Peter Gold

Volume： 15

Pages： 119-145

DOI： 10.1130/GES01670.1

Language： English

Journal： Geosphere

Geosphere

GEOSPHERE

影响因子：1.7

是否综述期刊：否

是否OA：是

是否预警：不在预警名单内

发行时间：-

ISSN：1553-040X

发刊频率：Bimonthly

收录数据库：SCIE/Scopus收录/DOAJ开放期刊

出版国家/地区：UNITED STATES

出版社：Geological Society of America

期刊介绍

Geosphere is GSA's ambitious, online-only publication that addresses the growing need for timely publication of research results, data, software, and educational developments in ways that cannot be addressed by traditional formats. The journal's rigorously peer-reviewed, high-quality research papers target an international audience in all geoscience fields. Its innovative format encourages extensive use of color, animations, interactivity, and oversize figures (maps, cross sections, etc.), and provides easy access to resources such as GIS databases, data archives, and modeling results. Geosphere's broad scope and variety of contributions is a refreshing addition to traditional journals.

Geosphere是GSA雄心勃勃的纯在线出版物，旨在以传统格式无法满足的方式满足对及时发布研究成果、数据、软件和教育发展的日益增长的需求。该杂志的严格同行评审，高质量的研究论文，目标是在所有地球科学领域的国际读者。其创新的格式鼓励广泛使用颜色、动画、交互性和超大图形（地图、横截面等），并提供对诸如GIS数据库、数据存档和建模结果等资源的轻松访问。Geosphere的广泛范围和各种各样的贡献是一个令人耳目一新的除了传统的期刊。

年发文量	95
国人发稿量	11
国人发文占比	11.58%
自引率	11.8%
平均录取率	较易
平均审稿周期	较慢,6-12周
版面费	$2,750 USD
偏重研究方向	地学-地球科学综合
期刊官网	http://geosphere.geoscienceworld.org/
投稿链接	http://www.editorialmanager.com/geosphere/default.aspx

质量指标占比

研究类文章占比	OA被引用占比	撤稿占比	出版后修正文章占比
100.00%	81.09%	0.00%	4.23%

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