Inferences Drawn from Two Decades of Alinement Array Measurements of Creep on Faults in the San Francisco Bay Region

Inferences Drawn from Two Decades of Alinement Array Measurements of Creep on Faults in the San Francisco Bay Region
复制标题

从旧金山湾地区断层蠕变的直线阵列测量中得出的推论

DOI：
--
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
J. Lienkaemper
J. Lienkaemper
中科院分区：
--
文献类型：
--
作者：
J. Galehouse;J. Lienkaemper

文献摘要

被引文献

相似文献

我们总结了20多年来对旧金山湾区圣安德烈亚斯系统断层的地表蠕变监测。圣安德烈亚斯断层完全锁定在1906年地震破裂南端圣胡安鲍蒂斯塔西北的五个地点，即没有观察到蠕变(&lt；1毫米/年)。同样，圣格雷戈里奥断层、罗杰斯河断层和西纳帕断层也没有蠕动迹象。从霍利斯特向南的卡拉维拉斯-派辛斯断层上测得的蠕变速率为6毫米/年或10毫米/年(∼)，这取决于阵列是否跨越了所有的蠕动迹线。在霍利斯特以北，卡拉维拉斯中央的蠕变速率达到14±2 mm/年，但在卡拉维拉斯水库附近下降到∼2 mm/年，在那里滑动传递到海沃德断裂南部，其南端的最大蠕变速率为9 mm/年。然而，海沃德断层的大部分长度平均只有4.6毫米/年。北卡拉维拉斯断层现在以3-4毫米/年的速度爬行，向右走到康科德断层，后者的速度相似，为2.5-3.5毫米/年，略低于其向北延伸的绿谷断层的4.4毫米/年的速度。Maacama断层在Ukiah附近以4.4毫米/年的速度爬行，在Willits以6.5毫米/年的速度爬行。卡拉维拉斯断层的中段和南段主要是蠕动的，而海沃德、北卡拉维拉斯和马卡马断层部分锁定，与罗杰斯小溪和圣安德烈亚斯一起，有很高的大地震可能性。 2002年11月6日收到手稿。
We summarize over 20 years of monitoring surface creep on faults of the San Andreas system in the San Francisco Bay region using alinement arrays. The San Andreas fault is fully locked at five sites northwest from San Juan Bautista, the southern end of the 1906 earthquake rupture, that is, no creep (<1 mm/yr) is observed. Likewise, the San Gregorio, Rodgers Creek, and West Napa faults show no creep. The measured creep rate on the Calaveras-Paicines fault from Hollister southward is either 6 or ∼10 mm/yr, depending on whether the arrays cross all of the creeping traces. Northward of Hollister, the central Calaveras creep rate reaches 14 ± 2 mm/yr but drops to ∼2 mm/yr near Calaveras Reservoir, where slip transfers to the southern Hayward fault at a maximum creep rate of 9 mm/yr at its south end. However, the Hayward fault averages only 4.6 mm/yr over most of its length. The Northern Calaveras fault, now creeping at 3-4 mm/yr, steps right to the Concord fault, which has a similar rate, 2.5-3.5 mm/yr, which is slightly slower than the 4.4 mm/yr rate on its northward continuation, the Green Valley fault. The Maacama fault creeps at 4.4 mm/yr near Ukiah and 6.5 mm/yr in Willits. The central and southern segments of the Calaveras fault are predominantly creeping, whereas the Hayward, Northern Calaveras, and Maacama faults are partly locked and, along with the Rodgers Creek and San Andreas, have high potential for major earthquakes. Manuscript received 6 November 2002.