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

墨西哥北部库卡普山脉和埃尔马约尔山脉地震引发的大规模运动。

基本信息

批准号：
NE/I00842X/1
负责人：
David Neil Petley
金额：
$ 6.61万
依托单位：
Durham University
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2010
资助国家：
英国
起止时间：
2010 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=NE%2FI00842X%2F1
关键词：
SEISMICALLY INDUCED MASS MOVEMENTS SIERRA

项目摘要

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.

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，断层破裂产生了地形。然而，众所周知，震级约为4兆瓦以上的地震事件会导致山体滑坡。最近的一些研究表明，被高震级地震卡住的山区侵蚀的物质数量超过了通过相关隆起进入该地区的物质数量。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库卡帕山脉和埃尔马约尔山脉。地震使古卡帕山脉的几条北西向转换断裂破裂。我们试图量化由于山体滑坡而从山上侵蚀的物质的数量，并将其与通过隆起增加的物质的数量进行比较。这将提供对大地震在造山中所起作用的关键洞察。我们的数据也将有助于建立地震震动、地形、构造地质和滑坡引发之间的经验关系。我们将使用地面激光扫描(TLS)来产生与地震相关的滑坡的子集的体积估计。然后，这些数据将用于校准从高分辨率SPOT 5卫星图像获取的整个范围的基于事件的山体滑坡清单的面积-体积换算。与地震相关的隆起量将使用干涉合成孔径雷达进行评估。由于这次地震涉及整个库卡帕山脉，在地表震动最严重的地区，这为研究与明确界定的地貌系统上的高震级地震事件有关的质量通量提供了独特的机会。