气候变化领域集成服务门户(CCPortal): Triggered afterslip on the southern Hikurangi subduction interface following the 2016 Kaikōura earthquake from InSAR time series with atmospheric corrections

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DOI	10.1016/j.rse.2020.112097
	Triggered afterslip on the southern Hikurangi subduction interface following the 2016 Kaikōura earthquake from InSAR time series with atmospheric corrections
	Yu C.; Li Z.; Penna N.T.
发表日期	2020
ISSN	00344257
卷号	251
英文摘要	The 2016 Mw 7.8 Kaikōura earthquake represents an extremely complex event involving over ten major crustal faults, altering conventional understanding of multi-fault ruptures. Although evidence for coseismic slip on the Hikurangi subduction interface is controversial, we present afterslip on the subduction zone beneath Marlborough using 13 months of Interferometric Synthetic Aperture Radar (InSAR) and Global Positioning System (GPS) observations. The spatially and temporally correlated atmospheric errors in SAR interferograms are problematic, and hence a new InSAR time series approach, combining the Generic Atmospheric Correction Online Service (GACOS) with a spatial-temporal Atmospheric Phase Screen (APS) filter to facilitate the InSAR time series analysis, is developed. For interferograms with over 250 km spatial extent, we achieve a 0.77 cm displacement RMS difference against GPS, improving 61% from the conventional InSAR time series method (TS). Comparisons between the overlapping region of two independent tracks show an RMS difference of 1.1 cm for the TS-GACOS-APS combined method, improving 54% from the TS method and 27% from using TS with an APS filter only. The APS filter reduces the short wavelength residuals substantially, but fails to remove the long wavelength error even after the ramp removal, revealing that the GACOS correction has played a key role in mitigating long wavelength atmospheric effects. The resultant InSAR displacements, together with the GPS displacements, are used to recover the time-dependent afterslip distribution on the Hikurangi subduction interface, which provides insights for reviewing the co-seismic slip sources, the present status of the subduction plate boundary and future seismic hazards. © 2020 The Author(s)
英文关键词	Afterslip; Atmospheric corrections; GACOS; Hikurangi subduction zone; InSAR time series
语种	英语
scopus关键词	Earthquakes; Faulting; Global positioning system; Interferometry; Phase shifters; Time series analysis; Atmospheric corrections; Atmospheric effects; Atmospheric errors; Interferometric synthetic aperture radars; Long wavelength errors; Overlapping regions; Subduction interface; Time series method; Synthetic aperture radar; atmospheric correction; earthquake event; error analysis; GPS; plate boundary; subduction zone; synthetic aperture radar; time series analysis; wavelength; Hikurangi; Marlborough; New Zealand; North Island; Northland; South Island
来源期刊	Remote Sensing of Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179106
作者单位	School of Engineering, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom; College of Geological Engineering and Geomatics, Chang'an University, Xi'an, 710054, China
推荐引用方式 GB/T 7714	Yu C.,Li Z.,Penna N.T.. Triggered afterslip on the southern Hikurangi subduction interface following the 2016 Kaikōura earthquake from InSAR time series with atmospheric corrections[J],2020,251.
APA	Yu C.,Li Z.,&Penna N.T..(2020).Triggered afterslip on the southern Hikurangi subduction interface following the 2016 Kaikōura earthquake from InSAR time series with atmospheric corrections.Remote Sensing of Environment,251.
MLA	Yu C.,et al."Triggered afterslip on the southern Hikurangi subduction interface following the 2016 Kaikōura earthquake from InSAR time series with atmospheric corrections".Remote Sensing of Environment 251(2020).