Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
doi:10.5194/nhessd-2-3533-2014
© Author(s) 2014. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
16 May 2014
Review status
This discussion paper has been under review for the journal Natural Hazards and Earth System Sciences (NHESS). The manuscript was not accepted for further review after discussion.
Anomalies of zenith tropospheric delay following the Mw 7.8 Haida Gwaii earthquake
Y. B. Yao1,2, X. X. Lei1, Q. Liu1, C. Y. He1, B. Zhang1, and L. Zhang1 1School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China
2Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan 430079, China
Abstract. The 2012 Haida Gwaii earthquake was a massive Mw 7.8 earthquake that struck the Queen Carlotte Islands Region on 28 October 2012 (UTC). This study analyzed the variations in zenith tropospheric delay (ZTD) following the Mw 7.8 Haida Gwaii earthquake using near real-time ZTD data collected from eleven stations in the seismic region and the forecast ZTD of ECMWF. A new differential method was used to detect anomalies of ZTD time series. Result showed that obvious ZTD anomalies occurred on the day of the earthquake (day-of-year, doy 302). There were anomalous ZTD variations at eight stations in the post-earthquake period on doy 302, possibly due to the processes of earthquake-generated acoustic waves. Propagation of acoustic waves caused variations of tropospheric parameters (e.g., atmospheric pressure, temperate, and atmosphere density), thus influencing ZTD. Absence of anomalous ZTD variations at the remaining three stations was attributed to the special topographic conditions, i.e., the long epicentral distance and the presence of huge mountains as a natural protective screen. Our work provides new insights to the relationship between of earthquake event and ZTD variation. The proposed differential method is superior to conventional method for detecting specific ZTD anomalies caused by earthquake events.

Citation: Yao, Y. B., Lei, X. X., Liu, Q., He, C. Y., Zhang, B., and Zhang, L.: Anomalies of zenith tropospheric delay following the Mw 7.8 Haida Gwaii earthquake, Nat. Hazards Earth Syst. Sci. Discuss., 2, 3533-3559, doi:10.5194/nhessd-2-3533-2014, 2014.
Y. B. Yao et al.
Interactive discussionStatus: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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RC C832: 'review comment', Anonymous Referee #1, 25 May 2014 Printer-friendly Version 
AC C1000: 'Response to the reviewer #1', Yibin Yao, 04 Jun 2014 Printer-friendly Version 
 
RC C2203: 'review comments', Anonymous Referee #2, 05 Oct 2014 Printer-friendly Version 
Y. B. Yao et al.
Y. B. Yao et al.

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