Co-seismic Gravity Change of Mw 7.9 Wenchuan Earthquake and Pre-Seismic Gravity Anomaly Detection by Superconducting Gravimeter at Hsinchu, Taiwan, from April to June 2008

S. C. Lan, T. T. Yu, C. Hwang, R. Kao

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Earthquakes are caused by crustal movement that releases a huge amount of energy and leads to deformation. The gravity near the epicenter is changed by the deformation of rock materials. Precursors may be detected during the period of seismogenic activity. On 12 May, 2008, a M w 7.9 earthquake struck near Wenchuan in China. A co-seismic gravity offset of 10.5μGal and a pre-seismic gravity anomaly about 2 days before the main shock was found in gravity records of the superconducting gravimeter (SG) at Hsinchu, Taiwan. SG records from April to June 2008 were used in this study. During this period of time, 8 gravity anomaly events caused by earthquakes were found. Sonograms of time-frequency analysis show that the perturbations occurred in 1-2 major bands (0.1-0.15Hz and 0.2-0.3Hz). The results of canonical correlation analysis show a significant positive correlation between the duration of gravity perturbation before the main shock and the magnitude of the earthquake. This study suggest that SG is a promising instrument for the analysis of earthquake events.

Original languageEnglish
Title of host publicationVII Hotine-Marussi Symposium on Mathematical Geodesy - Proceedings of the Symposium
Pages355-360
Number of pages6
DOIs
Publication statusPublished - 2012
Event8th Hotine-Marussi Symposium on Mathematical Geodesy - Chania, Crete, Italy
Duration: 2009 Jul 62009 Jul 10

Publication series

NameInternational Association of Geodesy Symposia
Volume137
ISSN (Print)0939-9585

Other

Other8th Hotine-Marussi Symposium on Mathematical Geodesy
Country/TerritoryItaly
CityChania, Crete
Period09-07-0609-07-10

All Science Journal Classification (ASJC) codes

  • Computers in Earth Sciences
  • Geophysics

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