SEISMICALLY INDUCED MASS MOVEMENTS IN THE SIERRA CUCAPÁ AND SIERRA EL MAYOR, NORTHERN MEXICO.

有了这笔资金，我们寻求更好地了解地震对山区地形的地貌影响。普遍接受的造山概念模型表明，断层破裂创造了地形。然而，已知震级超过4兆瓦的地震事件会导致山体滑坡。最近的一些研究表明，被高震级事件困住的山区被侵蚀的物质量大于通过相关隆起进入该地区的物质量。2010年4月4日，一场7.2兆瓦的浅层地震影响了墨西哥北部的Sierra cucap<e:1>和Sierra El Mayor山脉。地震破裂了几条北西向转换断层。我们试图量化由于山体滑坡而从山上侵蚀的物质数量，并将其与通过隆升而增加的物质数量进行比较。这将为大地震在造山过程中所起的作用提供关键的见解。我们的数据也将有助于建立地震震动、地形、构造地质和滑坡发生之间的经验关系。我们将使用地面激光扫描（TLS）对与地震有关的滑坡子集进行体积估计。然后，这些数据将用于校准区域-体积转换，以便从高分辨率spot5卫星图像中获取基于事件的整个范围的滑坡清单。与地震有关的隆起量将使用干涉合成孔径雷达进行评估。由于地震涉及到整个库卡帕山脉地表震动最大的区域，这为研究在一个明确的地貌系统上与高震级地震事件相关的质量通量提供了一个独特的机会。

With this funding, we seek to gain a better understanding of the geomorphic impact of earthquakes on mountainous terrain. The generally accepted conceptual model for mountain building indicates fault rupture creating relief. However, seismic events above a magnitude of approximately 4 Mw are known to cause landslides. Some recent work has suggested that the amount of material eroded from mountainous regions stuck by high magnitude events is greater than that input into the region through associated uplift. A shallow earthquake of magnitude 7.2 Mw affected the Sierra Cucapá and Sierra El Mayor ranges of Northern Mexico on April 4th 2010. The earthquake ruptured several NW trending transform faults of the Sierra Cucapá. We seek to quantify the amount of material eroded from the mountains due to landslides and compare this to the amount of material added through uplift. This will provide key insight into the role that large earthquakes play in mountain building. Our data will also be useful in establishing empirical relationships betweem seismic shaking, topography, stuctural geology, and landslide initiation. We will use terrestrial laser scanning (TLS) to produce volumetric estimates of a subset of the landslides associated with the earthquake. These data will then be used to calibrate area-volume conversions for an event based landslide inventory of the entire range taken from high resolution SPOT 5 satellite imagery. The amount of uplift associated with the earthquake will be assessed using interferometric synthetic aperture radar. As the earthquake involved the entire Sierra Cucapa in the zone of highest surface shaking, this offers a unique opportunity to study the mass fluxes associated with a high magnitude seismic event over a well defined geomorphic system.