Revealing coseismic displacements and the deformation zones of the 1999 Chi-Chi earthquake in the Tsaotung area, central Taiwan, using digital cadastral data

Yuan Hsi Lee, Kun Che Wu, Ruey Juan Rau, He Chin Chen, Wei Lo, Kai Chien Cheng

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

[1] The 1999 Chi-Chi, Taiwan, earthquake (Mw 7.6) was the largest earthquake to strike Taiwan in the twentieth century. This earthquake is associated with a 100 km long surface rupture. In order to reveal the details of displacement near the surface rupture, we use a digital cadastral system to calculate coseismic displacement around the Tsaotung area, central Taiwan. The digital cadastral system was originally conceived to survey land and building boundaries. In the Tsaotung area, Taiwan authorities have taken digital cadastral measurements before and after the Chi-Chi earthquake. The cadastral system affords high-density control points that reach ∼1421 points/km2, a system denser than that of the GPS. Accuracy is to within ±11 cm, a level that is higher than spot imaging and one that allows us to study surface deformation in detail. Coseismic displacement is ∼4.3-4.6 m at distance from the surface rupture and decreases to 3-4 m near the surface rupture. The azimuth of horizontal displacements is ∼310°-315° and rotates to 280°-305° near the surface rupture. This produced a compression, left-lateral deformation zone with ∼10-3 compression strain near the surface rupture. Coseismic displacement of the footwall is 1-1.2 m in 110°, which is similar to that from using GPS data. In the Tsaotung thrust slice, we observed that the azimuth of horizontal displacement rotates from a NW trend to a south trend as a result of slip partitioning and gravity slide effect.

Original languageEnglish
Article numberB03419
JournalJournal of Geophysical Research: Solid Earth
Volume115
Issue number3
DOIs
Publication statusPublished - 2010 Mar

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Chi-Chi earthquake 1999
Taiwan
Earthquakes
earthquakes
rupture
azimuth
earthquake
Global positioning system
GPS
compression
trends
footwall
chutes
twentieth century
thrust
Gravitation
slip
partitioning
gravity
gravitation

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

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title = "Revealing coseismic displacements and the deformation zones of the 1999 Chi-Chi earthquake in the Tsaotung area, central Taiwan, using digital cadastral data",
abstract = "[1] The 1999 Chi-Chi, Taiwan, earthquake (Mw 7.6) was the largest earthquake to strike Taiwan in the twentieth century. This earthquake is associated with a 100 km long surface rupture. In order to reveal the details of displacement near the surface rupture, we use a digital cadastral system to calculate coseismic displacement around the Tsaotung area, central Taiwan. The digital cadastral system was originally conceived to survey land and building boundaries. In the Tsaotung area, Taiwan authorities have taken digital cadastral measurements before and after the Chi-Chi earthquake. The cadastral system affords high-density control points that reach ∼1421 points/km2, a system denser than that of the GPS. Accuracy is to within ±11 cm, a level that is higher than spot imaging and one that allows us to study surface deformation in detail. Coseismic displacement is ∼4.3-4.6 m at distance from the surface rupture and decreases to 3-4 m near the surface rupture. The azimuth of horizontal displacements is ∼310°-315° and rotates to 280°-305° near the surface rupture. This produced a compression, left-lateral deformation zone with ∼10-3 compression strain near the surface rupture. Coseismic displacement of the footwall is 1-1.2 m in 110°, which is similar to that from using GPS data. In the Tsaotung thrust slice, we observed that the azimuth of horizontal displacement rotates from a NW trend to a south trend as a result of slip partitioning and gravity slide effect.",
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Revealing coseismic displacements and the deformation zones of the 1999 Chi-Chi earthquake in the Tsaotung area, central Taiwan, using digital cadastral data. / Lee, Yuan Hsi; Wu, Kun Che; Rau, Ruey Juan; Chen, He Chin; Lo, Wei; Cheng, Kai Chien.

In: Journal of Geophysical Research: Solid Earth, Vol. 115, No. 3, B03419, 03.2010.

Research output: Contribution to journalArticle

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