Distribution Pattern of Landslides Triggered by the 2014 Ludian Earthquake of China: Implications for Regional Threshold Topography and the Seismogenic Fault Identification

The 3 August 2014 Ludian earthquake with a moment magnitude scale (Mw) of 6.1 induced widespread landslides in the Ludian County and its vicinity. This paper presents a preliminary analysis of the distribution patterns and characteristics of these co-seismic landslides. In total, 1826 landslides with a total area of 19.12 km2 triggered by the 3 August 2014 Ludian earthquake were visually interpreted using high-resolution aerial photos and Landsat-8 images. The sizes of the landslides were, in general, much smaller than those triggered by the 2008 Wenchuan earthquake. The main types of landslides were rock falls and shallow, disrupted landslides from steep slopes. These landslides were unevenly distributed within the study area and concentrated within an elliptical area with a 25-km NW–SE striking long axis and a 15-km NW–SE striking short axis. Three indexes including landslides number (LN), landslide area ratio (LAR), and landslide density (LD) were employed to analyze the relation between the landslide distribution and several factors, including lithology, elevation, slope, aspect, distance to epicenter and distance to the active fault. The results show that slopes consisting of deeply weathered and fractured sandstones and mudstones were the more susceptible to co-seismic landslides. The elevation range of high landslide susceptibility was between 900–1300 m and 1800–2000 m. There was a generally positive correlation between co-seismic landslides and slope angle, until a maximum for the slope class 40°–50°. The co-seismic landslides occurred preferably on Southeast (SE), South (S) and Southwest (SW) oriented slopes. Results also show that the landslide concentration tends to decrease with distance from the surface projection of the epicenter rather than the seismogenic fault, and the highest landslide concentration is located within a 5–6 km distance of the seismogenic fault. Regarding the epicenter, the largest landslide clusters were found on the SE, northeast by east (NEE) and nearly West (W) of the epicenter. In addition, we also suggest that statistical results of slope gradients of landslides might imply a threshold topography of the study area within a tectonically active background. By analogy with other events, the statistical results of landslides aspects also imply the seismogenic fault of the Ludian earthquake might have been the Northwest (NW)-trending fault, which is consistent with other studies.

[1]  Wenjun Zheng,et al.  Landslides triggered by the 20 April 2013 Lushan, China, Mw 6.6 earthquake from field investigations and preliminary analyses , 2015, Landslides.

[2]  Fuchu Dai,et al.  Co-seismic landslide topographic analysis based on multi-temporal DEM—A case study of the Wenchuan earthquake , 2013, SpringerPlus.

[3]  David R. Montgomery,et al.  Landslide erosion coupled to tectonics and river incision , 2012 .

[4]  Kyoji Sassa,et al.  Landslide disasters triggered by the 2004 Mid-Niigata Prefecture earthquake in Japan , 2005 .

[5]  Gregory E. Tucker,et al.  Hillslope processes, drainage density, and landscape morphology , 1998 .

[6]  Salvatore Scudero,et al.  Landslide susceptibility assessment in the Peloritani Mts. (Sicily, Italy) and clues for tectonic control of relief processes , 2013 .

[7]  C. Westen,et al.  Distribution pattern of earthquake-induced landslides triggered by the 12 May 2008 Wenchuan earthquake , 2010 .

[8]  P. German.  Scale Dependence and Scale Invariance in Hydrology , 1999 .

[9]  Ligang Fang,et al.  Support vector machine modeling of earthquake-induced landslides susceptibility in central part of Sichuan province, China , 2015, Geoenvironmental Disasters.

[10]  Suhua Zhou,et al.  Slope unit-based distribution analysis of landslides triggered by the April 20, 2013, Ms 7.0 Lushan earthquake , 2015, Arabian Journal of Geosciences.

[11]  Robert G. Hilton,et al.  Seismic mountain building: Landslides associated with the 2008 Wenchuan earthquake in the context of a generalized model for earthquake volume balance , 2014 .

[12]  Joseph Wartman,et al.  Landslides in Eastern Honshu Induced by the 2011 Tohoku Earthquake , 2013 .

[13]  D. Keefer.  Landslides caused by earthquakes , 1984 .

[14]  F. Guzzetti,et al.  Landslide inventory maps: New tools for an old problem , 2012 .

[15]  Ping Sun,et al.  Landslide hazards triggered by the 2008 Wenchuan earthquake, Sichuan, China , 2009 .

[16]  Satoshi Fujiwara,et al.  Interpretation of landslide distribution triggered by the 2005 Northern Pakistan earthquake using SPOT 5 imagery , 2007 .

[17]  B. Khazai,et al.  Evaluation of factors controlling earthquake-induced landslides caused by Chi-Chi earthquake and comparison with the Northridge and Loma Prieta events , 2004 .

[18]  Laura Longoni,et al.  Remote Sensing for Landslide Investigations: An Overview of Recent Achievements and Perspectives , 2014, Remote. Sens..

[19]  Nicholas Brozovic,et al.  Bedrock incision, rock uplift and threshold hillslopes in the northwestern Himalayas , 1996, Nature.

[20]  Toyohiko Miyagi,et al.  Reconnaissance report on landslide disasters in northeast Japan following the M 9 Tōhoku earthquake , 2011 .

[21]  Bangxing Tang,et al.  Mountain disaster formation in northwest Sichuan , 1994 .

[22]  Mike Sandiford,et al.  Lifespan of mountain ranges scaled by feedbacks between landsliding and erosion by rivers , 2013, Nature.

[23]  Mark A. Bauer,et al.  Landslides triggered by the 8 October 2005 Kashmir earthquake , 2008 .

[24]  Atsushi Yashima,et al.  InSAR-derived digital elevation models for terrain change analysis of earthquake-triggered flow-like landslides based on ALOS/PALSAR imagery , 2015, Environmental Earth Sciences.

[25]  Jia-wen Zhou,et al.  Dynamic process analysis for the formation of Yangjiagou landslide-dammed lake triggered by the Wenchuan earthquake, China , 2013, Landslides.

[26]  Roberto W. Romeo,et al.  Earthquake-induced ground failures in Italy , 2000 .

[27]  Taro Uchida,et al.  Landslide patterns reveal the sources of large earthquakes , 2013 .

[28]  Julian J. Bommer,et al.  Earthquake-induced landslides in Central America , 2002 .

[29]  Qiang Xu,et al.  Spatial distribution analysis of landslides triggered by 2008.5.12 Wenchuan Earthquake, China , 2010 .

[30]  Minoru Yamanaka,et al.  DEM-Based Analysis of Earthquake-Induced Shallow Landslide Susceptibility , 2009 .

[31]  Qiang Chen,et al.  Quantification of mass wasting volume associated with the giant landslide Daguangbao induced by the 2008 Wenchuan earthquake from persistent scatterer InSAR , 2014 .

[32]  Zhiqiang Yin,et al.  Distribution characteristics of geohazards induced by the Lushan Earthquake and their comparisons with the Wenchuan Earthquake , 2014, Journal of Earth Science.

[33]  Kyoji Sassa,et al.  Analysis of a spatial distribution of landslides triggered by the 2004 Chuetsu earthquakes of Niigata Prefecture, Japan , 2007 .

[34]  Qiuming Gong,et al.  Spatial distribution of landslides triggered by the 2008 Ms 8.0 Wenchuan earthquake, China , 2011 .

[35]  Weile Li,et al.  Analysis of the geo-hazards triggered by the 12 May 2008 Wenchuan Earthquake, China , 2009 .

[36]  J. Bommer,et al.  Earthquake-induced landslides: 1980–1997 , 1999 .

[37]  Ping Lu,et al.  Landslide Investigation with Remote Sensing and Sensor Network: From Susceptibility Mapping and Scaled-down Simulation towards in situ Sensor Network Design , 2013, Remote. Sens..

[38]  Zhang Yon,et al.  Rupture process of the 3 August 2014 Ludian,Yunnan,M_w6.1(M_s6.5)earthquake , 2014 .

[39]  D. Keefer,et al.  Investigating Landslides Caused by Earthquakes – A Historical Review , 2002 .

[40]  Gerassimos A. Papadopoulos,et al.  Magnitude–distance relations for earthquake-induced landslides in Greece , 2000 .

[41]  Xu Xi,et al.  Discussion on seismogenic fault of the Ludian M_s6.5 earthquake and its tectonic attribution , 2014 .

[42]  Li Zhong-sheng,et al.  The State of the Art of the Research on Seismic Landslide Hazard at Home and abroad , 2003 .

[43]  B. Collins,et al.  Spatial distribution of landslides triggered from the 2007 Niigata Chuetsu–Oki Japan Earthquake , 2012 .

[44]  Qing Zhou,et al.  Earthquake-triggered landslides in southwest China , 2012 .

[45]  K. Shadan,et al.  Available online: , 2012 .

[46]  Chong Xu,et al.  Landslides triggered by slipping-fault-generated earthquake on a plateau: an example of the 14 April 2010, Ms 7.1, Yushu, China earthquake , 2013, Landslides.

[47]  Luca Ferrari,et al.  Landslides triggered by earthquakes and their relations with faults and mountain slope geometry: an example from Ecuador , 1995 .

[48]  Qiang Xu,et al.  Co-seismic landslide inventory and susceptibility mapping in the 2008 Wenchuan earthquake disaster area, China , 2013, Journal of Mountain Science.