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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Rupture lengths and temporal history of significant earthquakes on the offshore and north coast segments of the Northern San Andreas Fault based on turbidite stratigraphy
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Rupture lengths and temporal history of significant earthquakes on the offshore and north coast segments of the Northern San Andreas Fault based on turbidite stratigraphy

机译：基于浊度地层学的北圣安德烈亚斯断层近海和北海岸段重大地震的破裂长度和时间历史

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74 piston, gravity and jumbo Kasten cores were collected from channel and canyon systems draining the northern California continental margin to investigate the record of periodic Holocene turbidites for possible connection to large magnitude earthquakes on the adjacent Northern San Andreas Fault. Poorly known channel systems were mapped with multibeam sonar to define pathways and channel confluences. Cores sampled all major and many minor channel systems extending from Cape Mendocino to just north of Monterey Bay. Sampling both along and across channels was done and particular attention was paid to channel confluences, as these areas afford opportunities to test for synchronous triggering of turbidity currents. While at sea, all cores were scanned using a GEOTEK multisensor core logger (MSCL), which collects high-resolution photography, P-wave velocity, gamma-ray density, and magnetic susceptibility data from the unsplit cores. Lithology was logged visually, and cores were later imaged with X-radiography. We use C-14 ages, relative dating tests at channel confluences, and stratigraphic correlation using physical properties to determine whether turbidites deposited in separate channel systems are correlative, implying they were triggered by a common event. These tests can, in most cases, separate earthquake-triggered turbidity currents from other possible sources. The late Holocene turbidite record off northern California passes these tests for synchronous triggering, and can be correlated with multiple proxies from site to site between Noyo Channel and the latitude of San Francisco. Preliminary comparisons of our event ages with existing and in progress work at onshore coastal sites show good correlation, further circumstantial evidence that the offshore record is primarily earthquake generated. During the last similar to 2800 yr, 15 turbidites are recognized, including the great 1906 earthquake. Their chronology establishes an average repeat time of similar to 200 yr, similar to the onshore value of similar to 230 yr. Along-strike correlation suggests that at least 8 of the youngest 10 of these events ruptured the 320 km distance from the Mendocino Triple Junction to near San Francisco. (c) 2006 Published by Elsevier B.V.
机译：从北加利福尼亚大陆边缘排水的河道和峡谷系统中收集了74个活塞，重力和巨型Kasten岩心，以研究周期性全新世浊度的记录，可能与邻近的北圣安地列斯断层的大地震有关。将鲜为人知的渠道系统与多波束声纳进行映射，以定义路径和渠道汇合处。岩心采样了从门多西诺角一直延伸到蒙特雷湾以北的所有主要和许多次要渠道系统。已完成沿通道和跨通道的采样，并特别注意通道汇合，因为这些区域提供了测试浊流同步触发的机会。在海上时，所有的岩心都使用GEOTEK多传感器岩心记录仪（MSCL）进行了扫描，该仪从未分裂的岩心中收集高分辨率的照片，P波速度，伽马射线密度和磁化率数据。目视记录岩性，然后用X射线照相术对岩心成像。我们使用C-14年龄，通道汇合处的相对年代测验以及使用物理性质的地层相关性来确定沉积在单独通道系统中的浊度是否相关，这暗示它们是由共同事件触发的。在大多数情况下，这些测试可以将地震触发的浊流与其他可能来源分开。加利福尼亚北部的全新世浊积浊记录通过了这些同步触发测试，并且可以与Noyo海峡和旧金山纬度之间站点之间的多个代理相关。我们将事件年龄与陆上沿海站点的现有和正在进行的工作进行的初步比较显示出良好的相关性，进一步的间接证据表明，近海记录主要是由地震产生的。在与2800年相似的最后一个时期，识别出15个浊积岩，包括1906年大地震。他们的时间顺序确定了平均重复时间约为200年，类似于陆上值约为230年。沿袭相关性表明，在这些事件中，最年轻的10次中至少有8次中断了从Mendocino Triple Junction到旧金山附近的320公里距离。 （c）2006年由Elsevier B.V.

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