Spatial variations of the house collapse and afflicted population by aerial images in the Wenchuan earthquake

Liping Lei; Liangyun Liu; Li Zhang; Jiantao Bi; Yanhong Wu; Quanjun Jiao; Wenjuan Zhang

doi:10.1117/12.873270

3 November 2010 Spatial variations of the house collapse and afflicted population by aerial images in the Wenchuan earthquake

Liping Lei, Liangyun Liu, Li Zhang, Jiantao Bi, Yanhong Wu, Quanjun Jiao, Wenjuan Zhang

Author Affiliations +

Proceedings Volume 7841, Sixth International Symposium on Digital Earth: Data Processing and Applications; 78411H (2010) https://doi.org/10.1117/12.873270
Event: The Sixth International Symposium on Digital Earth, 2009, Beijing, China

Abstract

The spatial variation of collapsing houses caused by the earthquake may be used to assess the earthquake damage intensity, and support the emergency decision-making process in rescue and recovery operations. We monitored the spatial variation of house collapse ratio in the 5.12 Wenchuan Earthquake by the aerial images, and analyzed the relationship with the earthquake intensity and assessed the afflicted population from the population and house collapse ratio. The house collapse ratio was derived based on the results of visual interpretation of the collapsed houses and noncollapsed houses by ADS40 airborne images acquired from May 15 to May 28, 2008. The results show that the houses were widely damaged in earthquake-damaged region; especially the counties of Wenchuan, Beichuan, Qinchuan, Mianzhu, Shifang and Pengzhou experienced the severest damage. The house collapse ratios, which are above 50%, mainly distributed along the surface rupture in a SW to NE direction from Yinxiu to Beichuan. When analyzing the spatial variation of the house collapse ratio and its relationship with the earthquake intensity, it was found the house collapse ratio and the earthquake intensity presented positive correlation. An index called the afflicted population which was derived by the house collapse ratio multiplying the population density showed a correlation with the actual fatalities population, which will be available to provide the reference information for the decision-making of rescue areas where the life of peoples may be urgently needed to rescue.

Citation Download Citation

Liping Lei, Liangyun Liu, Li Zhang, Jiantao Bi, Yanhong Wu, Quanjun Jiao, and Wenjuan Zhang "Spatial variations of the house collapse and afflicted population by aerial images in the Wenchuan earthquake", Proc. SPIE 7841, Sixth International Symposium on Digital Earth: Data Processing and Applications, 78411H (3 November 2010); https://doi.org/10.1117/12.873270

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KEYWORDS

Earthquakes

Visualization

Statistical analysis

Remote sensing

Spatial resolution

Human-computer interaction

Image analysis

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