Geodetically observed surface displacements of the 1999 Chi-Chi, Taiwan, earthquake

Research output: Contribution to journalArticle

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Abstract

The 21 September 1999 Chi-Chi, Taiwan, earthquake of magnitude MW = 7.6 (M(L) = 7.3) severely deformed the Earth's crust in the central Taiwan region. The earthquake created an 85-km-long surface rupture along the Chelungpu fault. The epicenter was located at 23.85°N, 120.81°E, near the southern end of the rupture zone. Three-dimensional displacements of 285 geodetic control stations were determined in this study from Global Positioning System (GPS) observations collected before and after the earthquake. The detailed surface displacement field shows that individual stations are vertically uplifted by up to 4 m and displaced horizontally by up to 9 m, with the largest displacement occurring near the northern end of the ruptured thrust fault. The azimuth of the surface displacement field is approximately parallel to the direction of tectonic convergence of the Eurasian and Philippine Sea plates. The maximum three-dimensional displacement of 9.9 m is among the largest fault movements ever measured for modern earthquakes.

Original languageEnglish
Pages (from-to)403-413
Number of pages11
JournalEarth, Planets and Space
Volume52
Issue number6
DOIs
Publication statusPublished - 2000 Jan 1

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Chi-Chi earthquake 1999
Taiwan
earthquakes
earthquake
rupture
stations
Philippines
Earth crust
Philippine Sea plate
Global Positioning System
thrust fault
earthquake epicenter
azimuth
tectonics
GPS

All Science Journal Classification (ASJC) codes

  • Geology
  • Space and Planetary Science

Cite this

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title = "Geodetically observed surface displacements of the 1999 Chi-Chi, Taiwan, earthquake",
abstract = "The 21 September 1999 Chi-Chi, Taiwan, earthquake of magnitude MW = 7.6 (M(L) = 7.3) severely deformed the Earth's crust in the central Taiwan region. The earthquake created an 85-km-long surface rupture along the Chelungpu fault. The epicenter was located at 23.85°N, 120.81°E, near the southern end of the rupture zone. Three-dimensional displacements of 285 geodetic control stations were determined in this study from Global Positioning System (GPS) observations collected before and after the earthquake. The detailed surface displacement field shows that individual stations are vertically uplifted by up to 4 m and displaced horizontally by up to 9 m, with the largest displacement occurring near the northern end of the ruptured thrust fault. The azimuth of the surface displacement field is approximately parallel to the direction of tectonic convergence of the Eurasian and Philippine Sea plates. The maximum three-dimensional displacement of 9.9 m is among the largest fault movements ever measured for modern earthquakes.",
author = "Ming Yang and Ruey-Juin Rau and Yu, {Jyh Yih} and Ting-To Yu",
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Geodetically observed surface displacements of the 1999 Chi-Chi, Taiwan, earthquake. / Yang, Ming; Rau, Ruey-Juin; Yu, Jyh Yih; Yu, Ting-To.

In: Earth, Planets and Space, Vol. 52, No. 6, 01.01.2000, p. 403-413.

Research output: Contribution to journalArticle

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AB - The 21 September 1999 Chi-Chi, Taiwan, earthquake of magnitude MW = 7.6 (M(L) = 7.3) severely deformed the Earth's crust in the central Taiwan region. The earthquake created an 85-km-long surface rupture along the Chelungpu fault. The epicenter was located at 23.85°N, 120.81°E, near the southern end of the rupture zone. Three-dimensional displacements of 285 geodetic control stations were determined in this study from Global Positioning System (GPS) observations collected before and after the earthquake. The detailed surface displacement field shows that individual stations are vertically uplifted by up to 4 m and displaced horizontally by up to 9 m, with the largest displacement occurring near the northern end of the ruptured thrust fault. The azimuth of the surface displacement field is approximately parallel to the direction of tectonic convergence of the Eurasian and Philippine Sea plates. The maximum three-dimensional displacement of 9.9 m is among the largest fault movements ever measured for modern earthquakes.

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