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DOI | 10.1002/2017GL072612 |
Holocene slip rates along the San Andreas Fault System in the San Gorgonio Pass and implications for large earthquakes in southern California | |
Heermance, Richard V.; Yule, Doug | |
2017-06-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:11 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The San Gorgonio Pass (SGP) in southern California contains a 40km long region of structural complexity where the San Andreas Fault (SAF) bifurcates into a series of oblique-slip faults with unknown slip history. We combine new Be-10 exposure ages (Qt4: 8600 (+2100, -2200) and Qt3: 5700 (+1400, -1900)years B.P.) and a radiocarbon age (126060years B.P.) from late Holocene terraces with scarp displacement of these surfaces to document a Holocene slip rate of 5.7 (+2.7, -1.5)mm/yr combined across two faults. Our preferred slip rate is 37-49% of the average slip rates along the SAF outside the SGP (i.e., Coachella Valley and San Bernardino sections) and implies that strain is transferred off the SAF in this area. Earthquakes here most likely occur in very large, throughgoing SAF events at a lower recurrence than elsewhere on the SAF, so that only approximately one third of SAF ruptures penetrate or originate in the pass. Plain Language Summary How large are earthquakes on the southern San Andreas Fault? The answer to this question depends on whether or not the earthquake is contained only along individual fault sections, such as the Coachella Valley section north of Palm Springs, or the rupture crosses multiple sections including the area through the San Gorgonio Pass. We have determined the age and offset of faulted stream deposits within the San Gorgonio Pass to document slip rates of these faults over the last 10,000years. Our results indicate a long-term slip rate of similar to 6mm/yr, which is almost 1/2 of the rates east and west of this area. These new rates, combined with faulted geomorphic surfaces, imply that large magnitude earthquakes must occasionally rupture a 300km length of the San Andreas Fault from the Salton Sea to the Mojave Desert. Although many (similar to 65%) earthquakes along the southern San Andreas Fault likely do not rupture through the pass, our new results suggest that large >M-w 7.5 earthquakes are possible on the southern San Andreas Fault and likely occur every 1000-1500years. |
英文关键词 | San Andreas Fault slip rates San Gorgonio Pass Be-10 exposure dating |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000404382600018 |
WOS关键词 | MISSION CREEK STRAND ; JACINTO FAULT ; BERNARDINO MOUNTAINS ; COACHELLA VALLEY ; PLATE BOUNDARY ; ALLUVIAL-FAN ; PALMS OASIS ; ZONE ; PLEISTOCENE ; HETEROGENEITY |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
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/26701 |
专题 | 气候变化 |
作者单位 | Calif State Univ Northridge, Dept Geol Sci, Northridge, CA 91330 USA |
推荐引用方式 GB/T 7714 | Heermance, Richard V.,Yule, Doug. Holocene slip rates along the San Andreas Fault System in the San Gorgonio Pass and implications for large earthquakes in southern California[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(11). |
APA | Heermance, Richard V.,&Yule, Doug.(2017).Holocene slip rates along the San Andreas Fault System in the San Gorgonio Pass and implications for large earthquakes in southern California.GEOPHYSICAL RESEARCH LETTERS,44(11). |
MLA | Heermance, Richard V.,et al."Holocene slip rates along the San Andreas Fault System in the San Gorgonio Pass and implications for large earthquakes in southern California".GEOPHYSICAL RESEARCH LETTERS 44.11(2017). |
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