Landslides, earthquakes, and erosion
Landslides, earthquakes, and erosion
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DOI：
10.1016/j.epsl.2004.10.018
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发表时间：
2004-12-30
影响因子：
5.3
通讯作者：
Reichenbach, P
中科院分区：
文献类型：
--
作者：
Malamud, BD;Turcotte, DL;Reichenbach, P
本文将滑坡清单与侵蚀速率联系起来，并提供了与地震有关的滑坡危害的定量估计。我们通过利用三参数反伽马分布来做到这一点，该分布适合三个基本上“完整”的滑坡事件清单的频率区域统计。这种一般分布的一个结果是，可以引入滑坡事件量级(mL)- =logN(LT)，其中N-LT是与滑坡事件相关的滑坡总数。利用这一一般分布，可以从不完全滑坡清单中得到滑坡事件震级m(L)，其伴生滑坡的总面积和体积以及最大滑坡的面积和体积与滑坡事件震级直接相关。利用三次滑坡事件的估计复发间隔和两次历史清单的时间跨度，我们估计与滑坡相关的区域侵蚀速率通常为0.1-2.5 mm /年（-1）。接下来，我们给出了地震震级、相关滑坡事件震级和相关滑坡总量之间的经验相关性。利用这些相关性，我们估计产生滑坡的最小地震震级为M=4.3 +/- 0.4。最后，利用区域地震活动性的古腾堡-里氏频率-震级统计，我们将一个地区的地震活动性强度和最大的区域地震震级与侵蚀率联系起来。研究发现，活动俯冲带的典型地震侵蚀速率为0.2 ~ 7 mm /年（-1），板块边界走滑断裂带的典型地震侵蚀速率为0.01 ~ 0.7 mm /年（-1）。(C) 2004 Elsevier B.V.版权所有
This paper relates landslide inventories to erosion rates and provides quantitative estimates of the landslide hazard associated with earthquakes. We do this by utilizing a three-parameter inverse-gamma distribution, which fits the frequency area statistics of three substantially 'complete' landslide-event inventories. A consequence of this general distribution is that a landslide-event magnitude (mL)- =logN(LT) can be introduced, where N-LT is the total number of landslides associated with the landslide event. Using this general distribution, landslide-event magnitudes m(L) can be obtained from incomplete landslide inventories, and the total area and volume of associated landslides, as well as the area and volume of the maximum landslides, can be directly related to the landslide-event magnitude. Using estimated recurrence intervals for three landslide events and the time span for two historical inventories, we estimate regional erosion rates associated with landslides as typically 0.1-2.5 mm year(-1). We next give an empirical correlation between the earthquake magnitude, associated landslide-event magnitude, and the total volume of associated landslides. Using these correlations, we estimate that the minimum earthquake magnitudes that will generate landslides is M=4.3 +/- 0.4. Finally, using Gutenberg-Richter frequency-magnitude statistics for regional seismicity, we relate the intensity of seismicity in an area and the magnitude of the largest regional earthquakes to erosion rates. We find that typical seismically induced erosion rates in active subduction zones are 0.2-7 mm year(-1) and adjacent to plate boundary strike-slip fault zones are 0.01-0.7 mm year(-1). (C) 2004 Elsevier B.V. All rights reserved.