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SURFACE DEFORMATION AND EARLY WARNING MAGNITUDE OF 2016 KAIKOURA (NEW ZEALAND) EARTHQUAKE FROM HIGH-RATE GPS OBSERVATIONS
- Source :
- Chinese Journal of Geophysics. 60:602-612
- Publication Year :
- 2017
- Publisher :
- Wiley, 2017.
-
Abstract
- On 13th November 2016, the Kaikoura region of New Zealand was struck by a major Mw7.8 earthquake. In this study, coseismic deformation field is derived from 1 Hz high-rate GPS observations based on the GAMIT track solution module, combining with PCA spatial filtering method firstly. Then the 5 s peak displacement of P-wave (Pd) and the peak ground displacement (PGD) are extracted from the real-time simulated kinematic displacements of the trackRTr module. Finally, the warning magnitude is calculated from the statistical regression model. Our results indicate that the duration time of the kinematic deformation is up to 2 min. The KAIK and HANM stations, which are closest to the epicenter, have secondary severe deformation. And the deformation amplitude of the north stations of the epicenter is larger than that of the south. The static coseismic deformation field from high-rate GPS observations shows the characteristics of the focal mechanism of strike-slip after thrust. In addition, the Pd warning magnitudes from different stations have a significant difference, with the maximum magnitude difference of Mw2.5. Considering the timeliness and reliability of the warning magnitude jointly, the warning magnitude from the four-station PGD joint warning method of reasonable spatial distribution can reach its initial stability (Mw7.56) at 23 s after the event, while final stability (Mw7.78) at 110 s, which is consistent with the USGS moment tensor magnitude (Mw7.8).
- Subjects :
- Focal mechanism
010504 meteorology & atmospheric sciences
Warning system
business.industry
Magnitude (mathematics)
General Medicine
Deformation (meteorology)
010502 geochemistry & geophysics
Geodesy
01 natural sciences
Displacement (vector)
Epicenter
Global Positioning System
Maximum magnitude
business
Geology
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 08989591
- Volume :
- 60
- Database :
- OpenAIRE
- Journal :
- Chinese Journal of Geophysics
- Accession number :
- edsair.doi...........8284a9a24e7b91f8375df5a5fecb0f6f