Publications

Wen, X; Zhang, H; Zhou, B; Huang, HN; Yuan, YD (2016). Analysis of MODIS Satellite Thermal Infrared Information Before and After M-S 6.5 Ludian Earthquake. GEO-INFORMATICS IN RESOURCE MANAGEMENT AND SUSTAINABLE ECOSYSTEM, 569, 417-433.

Abstract
Continuous MODIS/Terra satellite remote sensing thermal infrared data of the 6.5-magnitude earthquake region in Ludian, Yunnan, from June to August 2014 were collected. Through cloud removing and other data treatments, the infrared data obtained during the optimal observation period from 5: 00 a.m. to 7: 00 a.m. of Beijing time were chosen for surface temperature retrieval. The relationship between the time-based evolution of anomalous surface temperature and anomalous space distribution, and the active fault before and after the earthquake was analyzed; the time and space relevance between the anomalous surface temperature and the latent heat flux changes was studied; and the influence of non-structural factors, such as landform and seasonal climate, on the anomalous surface is studied. Results suggested that: (1) one month before the occurrence of Ludian Earthquake, the epicenter showed anomalously increasing temperature of the thermal infrared, meaning that the anomalous temperature increase was related to the earthquake occurrence time; the significant temperature increase lasted for half a month before the earthquake, and the anomalous temperature increase reached the peak five to six days before the earthquake, but it decreased dramatically after the earthquake; (2) based on the hyperspectral data and the geological observation meteorological data, the influence of clouds and vegetation cover in the earthquake area was removed. The latent heat flux changes inverted showed a close time and space relevance with the anomalous surface temperature increase; (3) the analysis of the relevance with the landform and the seasonal climate factors suggested that there was structural "temperature increase" information of out-of-season changes before the earthquake; (4) the anomalous temperature increase developed in the shape of "X" from the epicenter to the conjugate fault. This coincided with the mechanical effect generated by the "L-shaped" asymmetric conjugated fault extended in the NW-SE direction of the advantageous distribution of the horizontal maximum principal stress and the NW similar to EW direction after the earthquake. Considering the influence of landform, seasonal climate and other non-structural factors on anomalous temperature increase, the author thought that the temperature increase of the thermal infrared might be a short-term anomalous phenomenon before the earthquake.

DOI:
10.1007/978-3-662-49155-3_43

ISSN:
1865-0929