INVENTORY OF LANDSLIDES TRIGGERED BY THE 2014 MS6.5 LUDIAN EARTHQUAKE AND ITS IMPLICATIONS ON SEVERAL EARTHQUAKE PARAMETERS

doi:10.3969/j.issn.0253-4967.2014.04.020

Abstract

Abstract:

On August 3, 2014, an earthquake with M_S6.5 occurred at Ludian County, Yunnan Province of China. The earthquake caused 617 deaths, 112 missing, and 3, 143 injured. Thousands of landslides were triggered by the earthquake and some of the landslides buried a few settlements, which resulted in significant casualties and property losses. In this study, we compiled an inventory of landslides triggered by the Ludian earthquake based on visual interpretation of high resolution satellite images, which are TH01-02 and SJ9A satellite images photoed post-earthquake and GF1 images shot pre-earthquake. Furthermore, some of the landslides were verified by field photos and/or very high resolution aerial photographs. The result shows the Ludian earthquake triggered at least 1024 landslides with an area equal to or larger than 100 m². The landslides are distributed in a 250km² area, with a total landslide area of 5.19 km² and a total volume of 2.2×10⁷m³. In the landslide-distributing area, the landslide number density is 4.03km^-2, the landslide area density is 2.04%, and the landslide erosion thickness is about 86.7mm. The statistical result of landslide number and area in different directions of the epicenter shows that the main spread direction of the landslides is northwest-southeast and most of the landslides occurred southeast of the epicenter. This suggests that the seismogenic fault of the earthquake probably trends to northwest and the rupture direction is from northwest to southeast, which is consistent with evidences from seismic, geological, geophysical, as well as other aspects. Comparing the landslide distribution area, landslide number, landslide area, and landslide volume related to the Ludian earthquake with those of other earthquakes worldwide, the result shows that the earthquake registered a smaller landslide distribution area but a larger landslide area and a much larger landslide volume. It suggests that the hypocenter of the Ludian earthquake is shallow and seismic energy attenuation of the event is quite rapid.

Key words: 2014 Ludian earthquake, landslide inventory, satellite image, visual interpretation, seismogenic fault

摘要：

2014年8月3日云南鲁甸M_S6.5地震不仅直接造成建筑倒塌,还触发了大量的山体滑坡, 一些滑坡掩埋了居民点, 造成了严重的人员伤亡与财产损失.基于震后高分辨率TH01-02与SJ9A卫星影像, 震前高分辨率GF1卫星影像, 采用人工目视解译方法, 建立了鲁甸地震滑坡编录图.并基于部分滑坡的野外照片与超高分辨率航片对解译结果进行验证.结果表明, 鲁甸地震至少触发了1024处面积 > 100m²的滑坡.这些滑坡分布在一个面积约为250km²的区域内, 滑坡覆盖面积为5.19km², 总体积约为2.2×10⁷m³.滑坡分布区内的滑坡点密度约为4.03个·km^-2, 面密度约为2.04%, 滑坡平均剥蚀厚度约为86.7mm.对震中周围不同方位的滑坡数量与面积进行了统计, 结果显示, 滑坡总体上呈NW-SE方向分布, 且大多数滑坡位于震中的SE方向.这表明鲁甸地震发震构造更可能是一条NW向断层, 且破裂方向是自NW向SE.这与其他地震、地质、地球物理等方面的证据所表现出来的发震断层性质相吻合.将鲁甸地震滑坡分布面积、滑坡数量、面积、体积与全球其他震例进行对比, 结果表明, 鲁甸地震滑坡分布区较小, 但是大滑坡较多、滑坡体积相对大.这反映了鲁甸地震具有震源浅与地震能量衰减迅速的特点.

关键词: 2014年鲁甸地震, 滑坡编录, 卫星影像, 目视解译, 发震断层

CLC Number:

P315.9

XU Chong, XU Xi-wei, SHEN Ling-ling, DOU Shuai, WU Sai-er, TIAN Ying-ying, LI Xi. INVENTORY OF LANDSLIDES TRIGGERED BY THE 2014 M_S6.5 LUDIAN EARTHQUAKE AND ITS IMPLICATIONS ON SEVERAL EARTHQUAKE PARAMETERS[J]. SEISMOLOGY AND GEOLOGY, 2014, 36(4): 1186-1203.

许冲, 徐锡伟, 沈玲玲, 窦帅, 吴赛儿, 田颖颖, 李西. 2014年鲁甸M_S6.5地震触发滑坡编录及其对一些地震参数的指示[J]. 地震地质, 2014, 36(4): 1186-1203.

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