Co-seismic displacements, folding and shortening structures along the Chelungpu surface rupture zone occurred during the 1999 Chi-Chi (Taiwan) earthquake

Lin, Aiming; Ouchi, Toru; Chen, A.; Maruyama, Tadashi

doi:10.1016/s0040-1951(00)00230-4

Cited by 84 publications

(72 citation statements)

References 11 publications

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“…Field surveys reported a larger surface ruptures in the northern segment than in the southern one and the hanging wall moved more than the footwall (CGS 1999;Lin et al 2001;Chen et al 2004). The measured surface displacements are 1.0 -11.1 m horizontally and 2 -7.5 m vertically, with the largest being 11.1 m horizontally and 7.5 m vertically in the north.…”

Section: Resultsmentioning

confidence: 99%

A Review of the Source Parameters of the 1999 Ms7.6 Chi-Chi, Taiwan, Earthquake

Wang

2006

Terr. Atmos. Ocean. Sci.

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Section: Resultsmentioning

confidence: 99%

A Review of the Source Parameters of the 1999 Ms7.6 Chi-Chi, Taiwan, Earthquake

Wang

2006

Terr. Atmos. Ocean. Sci.

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“…Co-seismic slip increased northward along the fault trace with an average throw of 2 m on the southern section of the fault as compared to a throw of 5 -7 and 7 -9 m of horizontal displacement on the northern segment of the fault (Ma et al 2000;Chen et al 2001;Lin et al 2001). Strong ground motion, including high frequency acceleration and rupture velocity, decreased from south to north .…”

Section: Study Areamentioning

confidence: 94%

“…Secondary fault gouge of the southern Chelungpu fault can be illite-rich, mixed clays, or smectite-rich. Lin et al (2001) report coseismic flexural-slip folding structures sub-parallel to the 1999 rupture of the Chelungpu fault and oriented E-W to NW-SE where there are jogs in the fault. Fig.…”

Section: Along-strike Variationsmentioning

confidence: 97%

“…Strong ground motion, including high frequency acceleration and rupture velocity, decreased from south to north . The displacement was nearly pure thrust slip near the epicenter in the southern portion of the fault, and changed to oblique thrust with a strong left-lateral component in the north Dalguer et al 2001;Lin et al 2001). To the north, the rupture occurred in the hanging wall of an older fault strand called the Sanyi fault, whereas the rupture remained on the older established Chelungpu fault to the south ( Fig.…”

Section: Study Areamentioning

confidence: 99%

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Structural, Mineralogical, and Geochemical Characterization of the Chelungpu Thrust Fault, Taiwan

Isaacs¹,

Evans²,

Song³

et al. 2007

Terr. Atmos. Ocean. Sci.

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The Chelungpu fault, Taiwan, produced a northward propagating rupture on 21 September 1999 resulting in a M w 7.6 earthquake with a ~90 km long N-S trending fault scarp. The mineralogic and physical character of the fault-related rocks within the Chelungpu fault zone, as measured at 9 sites along 70 km of the 1999 rupture trace, changes significantly along strike and with depth. The northern section of the Chelungpu fault has a 10 -30 m-wide primary damage zone that is characterized by increased fracture density and alteration, but little microstructural damage to within 1 m from the main fault. The southern section of the Chelungpu fault has a 25 -70 m wide primary damage zone that is characterized by increased fracture density and alteration, the presence of intensely sheared rock, and numerous secondary faults and gouge zones as far as 240 m from the main fault. The complexity of the damage zone, geochemistry, and clay mineralogy of the southern fault zone may reflect its relative maturity (~1 Ma) compared to the northern fault zone (~46 -100 Ka). The major down-dip mineralogic variation is a transition from a significant amount of smectite in exhumed fault cores to little or no smectite in the fault core at sampled depths of 200 to 1000 m. This transition may be influenced by weathering processes at the surface, however co-seismic fluid flow may have a role in illite-smectite reactions. The composition of clays has important seismologic implications as clays play a role in fault weakening.

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“…This conceptual model of fault geometry is based on observations from a variety of sources including studies of earthquake surface ruptures (e.g., Zhang et al, 1999;Lin et al, 2001;Aydin and Kalafat, 2002;Treiman et al, 2002), exhumed faults (e.g., Martel, 1990;Cartwright et al, 1995;Willemse et al, 1997;Peacock, 2002), reflection seismology (e.g., Willemse et al, 1996;Walsh et al, 1999;Maerten et al, 2000;Kattenhorn and Pollard, 2001), and aftershock patterns (e.g., Waldhauser and Ellsworth, 2000;Carena and Suppe, 2002;Kilb and Rubin, 2002;Chiaraluce et al, 2003). To more precisely estimate coseismic slip and thus to advance the understanding of earthquake source parameters we advocate the incorporation of curved fault surfaces and tiplines in geodetic inversions of coseismic deformation.…”

Section: Introductionmentioning

confidence: 99%

Inverting for Slip on Three-Dimensional Fault Surfaces Using Angular Dislocations

Maerten

Resor

Pollard

et al. 2005

Bulletin of the Seismological Society of America

152

119

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Inverting for slip on three-dimensional fault surfaces using angular dislocations" Bulletin Of The Seismological Society Of America 95.5 (2005): 1654-1665. 1654Bulletin of the Seismological Society of America, Vol. 95, No. 5, pp. 1654-1665, October 2005, doi: 10.1785 Most common methods of inversion use rectangular dislocation segments to model fault ruptures and therefore oversimplify fault geometries. These geometric simplifications can lead to inconsistencies when inverting for slip on earthquake faults, and they preclude a more complete understanding of the role of fault geometry in the earthquake process.We have developed a new three-dimensional slip-inversion method based on the analytical solution for an angular dislocation in a linear-elastic, homogeneous, isotropic, half-space. The approach uses the boundary element code Poly3D that employs a set of planar triangular elements of constant displacement discontinuity to model fault surfaces. The use of triangulated surfaces as discontinuities permits one to construct fault models that better approximate curved three-dimensional surfaces bounded by curved tiplines: shapes that commonly are imaged by three-dimensional reflection seismic data and inferred from relocated aftershock data.We demonstrate the method's ability to model three-dimensional rupture geometries by inverting for slip associated with the 1999 Hector Mine earthquake. The resulting model avoids displacement anomalies associated with the overlapping rectangular dislocations used in previous models, improving the fit to the geodetic data by 32%, and honors the observed surface ruptures, thereby allowing more direct comparisons between geologic and geodetic data on slip distributions.

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Co-seismic displacements, folding and shortening structures along the Chelungpu surface rupture zone occurred during the 1999 Chi-Chi (Taiwan) earthquake

Cited by 84 publications

References 11 publications

A Review of the Source Parameters of the 1999 Ms7.6 Chi-Chi, Taiwan, Earthquake

A Review of the Source Parameters of the 1999 Ms7.6 Chi-Chi, Taiwan, Earthquake

Structural, Mineralogical, and Geochemical Characterization of the Chelungpu Thrust Fault, Taiwan

Inverting for Slip on Three-Dimensional Fault Surfaces Using Angular Dislocations

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