DOI: 10.1016/j.jag.2012.12.002
Scopus记录号: 2-s2.0-84880287648
论文题名: Local interpolation of coseismic displacements measured by inSAR
作者: Yaseen M ; , Hamm N ; A ; S ; , Woldai T ; , Tolpekin V ; A ; , Stein A
刊名: International Journal of Applied Earth Observation and Geoinformation
ISSN: 15698432
出版年: 2013
卷: 23, 期: 1 起始页码: 1
结束页码: 17
语种: 英语
英文关键词: Coseismic displacements
; Earthquakes
; Geostatistics
; InSAR
; Kriging
Scopus关键词: Bam earthquake 2003
; coseismic process
; displacement
; error analysis
; fault
; geostatistics
; interpolation
; kriging
; slip
; synthetic aperture radar
; variogram
英文摘要: Coseismic displacements play a significant role in characterizing earthquake causative faults and understanding earthquake dynamics. They are typically measured from InSAR using pre- and post-earthquake images. The displacement map produced by InSAR may contain missing coseismic values due to the decorrelation of ASAR images. This study focused on interpolating missing values in the coseismic displacement map of the 2003 Bam earthquake using geostatistics with the aim of running a slip distribution model. The gaps were grouped into 23 patches. Variograms of the patches showed that the displacement data were spatially correlated. The variogram prepared for ordinary kriging (OK) indicated the presence of a trend and thus justified the use of universal kriging (UK). Accuracy assessment was performed in 3 ways. First, 11 patches of equal size and with an equal number of missing values generated artificially, were kriged and validated. Second, the four selected patches results were validated after shifting them to new locations without missing values and comparing them with the observed values. Finally, cross validation was performed for both types of patch at the original and shifted locations. UK results werebetter than OK in terms of kriging variance, mean error (ME) and root mean square error (RMSE). For both OK and UK, only 4 out of 23 patches (1, 5, 11 and 21) showed ME and RMSE values that were substantially larger than for the other patches. The accuracy assessment results were found to be satisfactory with ME and RMSE values close to zero. InSAR data inversion demonstrated the usefulness of interpolation of the missing coseismic values by improving a slip distribution model. It is therefore concluded that kriging serves as an effective tool for interpolating the missing values on a coseismic displacement map. © 2012 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79814
Appears in Collections: 气候变化事实与影响
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作者单位: Faculty of Geo-Information Science and Earth Observation (ITC), University of Twente, PO Box 217, 7500 AE Enschede, Netherlands
Recommended Citation:
Yaseen M,, Hamm N,A,et al. Local interpolation of coseismic displacements measured by inSAR[J]. International Journal of Applied Earth Observation and Geoinformation,2013-01-01,23(1)