Results of GPS Observations for M7.8 Earthquake in 2016 in New Zealand and Discussion on Elastic Rebound Model

GU Guohua; WANG Wuxing

doi:10.13203/j.whugis20170286

Volume 42 Issue 11

Nov. 2017

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Geomatics and Information Science of Wuhan University > 2017 > 42(11): 1673-1680. > DOI: 10.13203/j.whugis20170286

GU Guohua, WANG Wuxing. Results of GPS Observations for M7.8 Earthquake in 2016 in New Zealand and Discussion on Elastic Rebound Model[J]. Geomatics and Information Science of Wuhan University, 2017, 42(11): 1673-1680. DOI: 10.13203/j.whugis20170286

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Results of GPS Observations for M7.8 Earthquake in 2016 in New Zealand and Discussion on Elastic Rebound Model

Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China

Funds:

The National Natural Science Foundation of China 41274098

the Basic Research Plan of the Institute of Earthquake Science, China Earthquake Administration 2013IES0407

the Research Fund of the China Earthquake Administration for Senior Scientist

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Author Bio:
GU Guohua, professor, specializes in GPS data processing, crustal deformation and precursors to earthquakes. E-mail: ggh@seis.ac.cn
Received Date: September 06, 2017
Published Date: November 04, 2017

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Abstract

Abstract

the coseismic and the preseismic displacements in the regional reference frame were obtained for the M7.8 earthquake on Nov. 13, 2016 in New Zealand based on time series of coordinates at continuous GPS observation stations, available from http://geodesy.unr.edu, in New Zealand and Australia. horizontal displacement time series vectors at CMBL and KAIK in New Zealand and at USUD and TSKB in Japan are shown. The vector time series show clearly with direct visual effect that the coseismic horizontal displacements were sudden and dramatic, and opposite to the accumulated preseismic horizontal displacements. These represent a rebound or elastic rebound of the accumulated preseismic horizontal displacements. Therefore, the accumulated preseismic horizontal displacements were precursors to the earthquakes. Results produced from the abundant GPS observations are used to discuss the rebound and elastic rebound models. Detailed reanalysis on the results of GPS observations of the M9.0 Tohoku earthquake in Japan shows that one principal strain in the region at and around the epicenter was dominated by compression in the east direction before the earthquake. Moreover, the earthquake and the coseismic displacements were the result of shear rupture at the earthquake faults. This agrees with test of rock failure results, strain analysis, and consistent with earthquake mechanisms.
- GPS,
- coseismic displacement,
- horizontal displacement vectors,
- M7.8 earthquake in New Zealand in 2016,
- elastic rebound

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