1 School of Geographical and Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK 2 College of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, China
Earthquake source parameters of the 2009 MW7.8 Fiordland (New Zealand) earthquake from L-band InSAR observations
1 School of Geographical and Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK 2 College of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, China
摘要The 2009 MW7.8 Fiordland (New Zealand) earthquake is the largest to have occurred in New Zealand since the 1931 MW7.8 Hawke’s Bay earthquake, 1 000 km to the northwest. In this paper two tracks of ALOS PALSAR interferograms (one ascending and one descending) are used to determine fault geometry and slip distribution of this large earthquake. Modeling the event as dislocation in an elastic half-space suggests that the earthquake resulted from slip on a SSW-NNE orientated thrust fault that is associated with the subduction between the Pacific and Australian Plates, with oblique displacement of up to 6.3 m. This finding is consistent with the preliminary studies undertaken by the USGS using seismic data.
Abstract：The 2009 MW7.8 Fiordland (New Zealand) earthquake is the largest to have occurred in New Zealand since the 1931 MW7.8 Hawke’s Bay earthquake, 1 000 km to the northwest. In this paper two tracks of ALOS PALSAR interferograms (one ascending and one descending) are used to determine fault geometry and slip distribution of this large earthquake. Modeling the event as dislocation in an elastic half-space suggests that the earthquake resulted from slip on a SSW-NNE orientated thrust fault that is associated with the subduction between the Pacific and Australian Plates, with oblique displacement of up to 6.3 m. This finding is consistent with the preliminary studies undertaken by the USGS using seismic data.
基金资助:the Natural Environmental Research Council (NERC) through the National Center of Earth Observation (NCEO) of which the Center for the Observation and Modelling of Earthquakes, Volcanoes and Tectonics (COMET+, http://comet.nerc.ac.uk) is a part. Part of this work was funded by a general project of National Natural Science Foundation of China (NSFC) (No. 40902081), and a key project of the Ministry of Land & Resources, China (No. 1212010914015)
通讯作者:
Zhenhong Li
E-mail: zhenhong.li@glasgow.ac.uk
引用本文:
Zhenhong Li, Wei Qu, Kateline Young, Qin Zhang. Earthquake source parameters of the 2009 MW7.8 Fiordland (New Zealand) earthquake from L-band InSAR observations[J]. 《地震学报》英文版, 2011, 24(2): 199-206.
Zhenhong Li, Wei Qu, Kateline Young, Qin Zhang. Earthquake source parameters of the 2009 MW7.8 Fiordland (New Zealand) earthquake from L-band InSAR observations. Earthquake Science, 2011, 24(2): 199-206.
