Erosion effects assessed by repeated gravity measurements in southern Taiwan

M. Mouyen*, F. Masson, Chein-way Hwang, C. C. Cheng, N. Le Moigne, C. W. Lee, R. Kao, W. C. Hsieh

*Corresponding author for this work

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

We analyse temporal variations of gravity measured in southern Taiwan since November 2006 at 10 sites using absolute gravimeters and, since November 2008, at 70 sites using a relative gravimeter. We describe and apply methods to interpret the gravity changes in terms of local hydrological processes and vertical ground motions. The effect of land water is computed from local rainfall data and a model of rain accumulation and discharge in the ground. The effect of the vertical motions of the ground is estimated using time-series of permanent Global Positioning System (GPS) stations and the theoretical gravity to height ratio of -2 μGal cm-1. Unexpectedly, Morakot typhoon (2009 August), the strongest typhoon in Taiwan in 50 yr, was responsible for the highest gravity changes. Morakot triggered numerous large landslides and debris flow deposits. Their thicknesses are estimated from the gravity changes (up to 280 μGal) along with field observations and satellite images. copy; The Authors 2012.

Original languageEnglish
Pages (from-to)113-136
Number of pages24
JournalGeophysical Journal International
Volume192
Issue number1
DOIs
StatePublished - 26 Mar 2013

Keywords

  • Asia.
  • Creep and deformation
  • Hydrology
  • Time variable gravity

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    Mouyen, M., Masson, F., Hwang, C., Cheng, C. C., Moigne, N. L., Lee, C. W., Kao, R., & Hsieh, W. C. (2013). Erosion effects assessed by repeated gravity measurements in southern Taiwan. Geophysical Journal International, 192(1), 113-136. https://doi.org/10.1093/gji/ggs019