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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Spatial variations in present-day deformation, Kenai Peninsula, Alaska, and their implications
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Spatial variations in present-day deformation, Kenai Peninsula, Alaska, and their implications

机译：当代变形，阿拉斯加基奈半岛的空间变异及其意义

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From four years of Global Positioning System (GPS) measurements, we find significant spatial variations in present-day deformation between the eastern and western Kenai Peninsula, Alaska. Sites in the eastern Kenai Peninsula and Prince William Sound move to the NNW relative to North America, in the direction of Pacific-North America relative plate motion. Velocities decrease in magnitude from nearly the full plate rate in southern Prince William Sound to about 30 mm/yr at Seward and to about 5 mm/yr near Anchorage. In contrast, sites in the western Kenai Peninsula move to the SW, in a nearly trenchward direction, with a velocity of about 20 mm/yr. The data are consistent with the shallow plate interface offshore and beneath the eastern Kenai and Prince William Sound being completely locked or nearly so, with elastic strain accumulation resulting in rapid motion in the direction of relative plate motion of sites in the overriding plate. The velocities of sites in the western Kenai, along strike to the southwest, are opposite in sign with those predicted from elastic strain accumulation. These data are incompatible with a significant locked region in this segment of the plate boundary. Trenchward velocities are found also for some sites in the Anchorage area. We interpret the trenchward velocities as being caused by a continuing postseismic transient from the 1964 great Alaska earthquake. There may be significant along-strike differences in the long-term behavior of the plate interface between the western and eastern Kenai, based on roughly coincident boundaries in the coseismic slip distribution, cumulative postseismic uplift, present-day plate coupling, and stress field. The present postseismic response appears to generate purely trenchward motion, suggesting a creep process that is purely dip slip. Our observations suggest that postseismic processes after the largest earthquakes can influence patterns of deformation for decades after the event. [References: 61]
机译：从全球定位系统（GPS）的四年测量中，我们发现阿拉斯加东部和西部基奈半岛之间当今的变形具有明显的空间差异。基纳半岛东部和威廉王子湾的地盘沿太平洋-北美相对板块运动的方向移动到相对于北美的NNW。速度的大小从威廉王子湾南部的几乎整个板块速度下降到苏厄德的每年约30毫米/年和安克雷奇附近的约5毫米/年。相比之下，基奈半岛西部的站点以接近20％/年的速度向近西南方向移动到西南偏南。这些数据与海上和肯纳东部和威廉王子湾下方的浅层板界面完全锁定或接近完全锁定，弹性应变累积导致在上覆板块位置的相对板块运动方向上快速运动。基纳西部西部，沿着西南走向，其速度与弹性应变累积所预测的速度相反。这些数据与板边界此段中的重要锁定区域不兼容。在安克雷奇地区的某些地点也发现了风速。我们将开挖速度解释为由1964年阿拉斯加大地震引起的持续的地震后瞬变引起。基于同震滑动分布，累积的震后隆升，现今的板块耦合和应力场的大致重合边界，西部和东部基奈之间板块界面的长期行为可能存在明显的沿走向差异。当前的地震后响应似乎产生了纯粹的向地运动，表明蠕变过程完全是倾滑。我们的观察结果表明，地震发生后数十年，最大地震后的地震后过程可能会影响变形模式。 [参考：61]

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