GSTDTAP  > 地球科学
DOI10.1073/pnas.1617945114
Reading a 400,000-year record of earthquake frequency for an intraplate fault
Williams, Randolph T.1; Goodwin, Laurel B.1; Sharp, Warren D.2; Mozley, Peter S.3
2017-05-09
发表期刊PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
ISSN0027-8424
出版年2017
卷号114期号:19页码:4893-4898
文章类型Article
语种英语
国家USA
英文摘要

Our understanding of the frequency of large earthquakes at timescales longer than instrumental and historical records is based mostly on paleoseismic studies of fast-moving plate-boundary faults. Similar study of intraplate faults has been limited until now, because intraplate earthquake recurrence intervals are generally long (10s to 100s of thousands of years) relative to conventional paleoseismic records determined by trenching. Long-term variations in the earthquake recurrence intervals of intraplate faults therefore are poorly understood. Longer paleoseismic records for intraplate faults are required both to better quantify their earthquake recurrence intervals and to test competing models of earthquake frequency (e.g., time-dependent, time-independent, and clustered). We present the results of U-Th dating of calcite veins in the Loma Blanca normal fault zone, Rio Grande rift, New Mexico, United States, that constrain earthquake recurrence intervals over much of the past similar to 550 ka-the longest direct record of seismic frequency documented for any fault to date. The 13 distinct seismic events delineated by this effort demonstrate that for > 400 ka, the Loma Blanca fault produced periodic large earthquakes, consistent with a time-dependent model of earthquake recurrence. However, this time-dependent series was interrupted by a cluster of earthquakes at similar to 430 ka. The carbon isotope composition of calcite formed during this seismic cluster records rapid degassing of CO2, suggesting an interval of anomalous fluid source. In concert with U-Th dates recording decreased recurrence intervals, we infer seismicity during this interval records faultvalve behavior. These data provide insight into the long-term seismic behavior of the Loma Blanca fault and, by inference, other intraplate faults.


英文关键词earthquake fault geochronology seismic hazard
领域地球科学 ; 气候变化 ; 资源环境
收录类别SCI-E
WOS记录号WOS:000400818400032
WOS关键词SAN-ANDREAS FAULT ; WASTE-WATER INJECTION ; HALF-LIVES ; CALIFORNIA ; RECURRENCE ; OKLAHOMA ; SEQUENCE ; URANIUM ; USA
WOS类目Multidisciplinary Sciences
WOS研究方向Science & Technology - Other Topics
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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/204704
专题地球科学
资源环境科学
气候变化
作者单位1.Univ Wisconsin, Dept Geosci, Madison, WI 53706 USA;
2.Berkeley Geochronol Ctr, Berkeley, CA 94709 USA;
3.New Mexico Inst Min & Technol, Earth & Environm Sci, Socorro, NM 87801 USA
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Williams, Randolph T.,Goodwin, Laurel B.,Sharp, Warren D.,et al. Reading a 400,000-year record of earthquake frequency for an intraplate fault[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2017,114(19):4893-4898.
APA Williams, Randolph T.,Goodwin, Laurel B.,Sharp, Warren D.,&Mozley, Peter S..(2017).Reading a 400,000-year record of earthquake frequency for an intraplate fault.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,114(19),4893-4898.
MLA Williams, Randolph T.,et al."Reading a 400,000-year record of earthquake frequency for an intraplate fault".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 114.19(2017):4893-4898.
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