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DOI | 10.1073/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
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ISSN | 0027-8424 |
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 |
URL | 查看原文 |
引用统计 | |
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 |
推荐引用方式 GB/T 7714 | 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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