Slip history and dynamic implications of the 1999 Chi‐Chi, Taiwan, earthquake

Ji, Chen; Helmberger, Donald V.; Wald, David J.; Fong, Kuo

doi:10.1029/2002jb001764

Cited by 187 publications

(185 citation statements)

References 39 publications

(75 reference statements)

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“…This feature is in contrast to the equidimensional ruptures often observed in earthquakes in a range of tectonic settings (e.g. Wald et al 1996;Ji et al 2003;Avouac et al 2006;Cheloni et al 2010;Copley et al 2012;Elliott et al 2013), including individual high-slip patches in some subduction zone megathrust events (e.g. Chlieh et al 2007;Delouis et al 2010).…”

Section: Depth Of Slip and Sedimentary Stratigraphymentioning

confidence: 59%

Seismogenic faulting of the sedimentary sequence and laterally variable material properties in the Zagros Mountains (Iran) revealed by the August 2014 Murmuri (E. Dehloran) earthquake sequence

Copley¹,

Karasözen

Oveisi

et al. 2015

Geophys. J. Int.

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S U M M A R YWe present source models for the August 2014 Murmuri (Dehloran) earthquake sequence in the Zagros Mountains of Iran. An M w 6.2 mainshock was followed by an aftershock sequence containing five events of M w ≥ 5.4. Models of P and SH waveforms show that all events had dominantly thrust-faulting mechanisms, and had centroid depths that place them within the thick sedimentary sequence, above the crystalline basement. The combination of our estimated focal mechanisms, relative relocations of the event hypocentres and the surface displacement patterns observed using InSAR imply that the mainshock and largest aftershock ruptured different fault planes and both contributed to the surface deformation. The fault planes both slipped in horizontally elongated patches, possibly due to rheological layering limiting the updip and downdip extent of rupture. The slip vector of the Murmuri mainshock implies that the decollement beneath the Lorestan Arc is weaker than any such feature beneath the Dezful Embayment, providing an explanation for the plan-view sinuosity of the range-front of the Zagros Mountains.

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Section: Depth Of Slip and Sedimentary Stratigraphymentioning

confidence: 59%

Seismogenic faulting of the sedimentary sequence and laterally variable material properties in the Zagros Mountains (Iran) revealed by the August 2014 Murmuri (E. Dehloran) earthquake sequence

Copley¹,

Karasözen

Oveisi

et al. 2015

Geophys. J. Int.

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“…We let the slip amplitude vary from 0 to 3 m and rake angle change from 60°to 120°. We allowed the starting time and end time [Ji et al, 2003] to range from 0.2 to 2 sec. The total rise time of each subfault is therefore limited to 0.4 to 4 sec.…”

Section: San Simeon Earthquakementioning

confidence: 99%

“…However, seismic and geodetic data sample ground deformation at different time scales; whether or not they are compatible is sometimes an issue. For example, afterslip contamination has been reported in the recent study of the 1999 Chi-Chi earthquake [Ji et al, 2003].…”

Section: Introductionmentioning

confidence: 99%

Slip history of the 2003 San Simeon earthquake constrained by combining 1‐Hz GPS, strong motion, and teleseismic data

Larson

Tan

et al. 2004

Geophysical Research Letters

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103

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[1] The slip history of the 2003 San Simeon earthquake is constrained by combining strong motion and teleseismic data, along with GPS static offsets and 1-Hz GPS observations. Comparisons of a 1-Hz GPS time series and a co-located strong motion data are in very good agreement, demonstrating a new application of GPS. The inversion results for this event indicate that the rupture initiated at a depth of 8.5 km and propagated southeastwards with a speed $3.0 km/sec, with rake vectors forming a fan structure around the hypocenter. We obtained a peak slip of 2.8 m and total seismic moment of 6.2 Â 10 18 Nm. We interpret the slip distribution as indicating that the hanging wall rotates relative to the footwall around the hypocenter, in a sense that appears consistent with the shape of the mapped fault trace.

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“…The proposed models are based on the speculated and simplified subsurface geometry of the thrust and its associated structures. Results of various models of slip distribution and the history of subsurface rupture (Lee and Ma 2000;Chi et al 2001;Ma et al 2001;Wu et al 2001;Yoshida 2001;Zeng and Chen 2001), rupture processes (Ji and Helmberger 2003;Lee and Ma 2000;Ma et al 2001;Wu et al 2001;Zeng and Chen 2001) and static stress transfer (Wang 2000; are highly related to the oversimplified 3D geometry of the active Chelungpu thrust presumed in the models. The importance of a detailed 3D geometry of the thrust for future research has been noted (Ma et al 2001).…”

Section: Introductionmentioning

confidence: 99%

3D Geometry of the Chelungpu Thrust System in Central Taiwan: Its Implications for Active Tectonics

Kang¹,

Huang²,

Wu³

et al. 2007

Terr. Atmos. Ocean. Sci.

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This study is aimed at constructing a 3D subsurface geometry of the Chelungpu thrust and its associated structures, as well as examining the implications of the studies results for active tectonics in the area. Nine balanced cross-sections were constructed across the foothills belt in the study area to delineate the subsurface geometry of the major thrusts in the foreland of the fold-and-thrust belt.The Chelungpu thrust cuts down to the subsurface invariably along the base of the Chinshui Shale and is merged with the Changhua thrust into a common décollement at a depth of 5 to 7 kilometers below the sea level. There is a pre-existing normal fault underneath the common décollement of the Changhua and Chelungpu thrusts which accommodates the thickened strata in the hanging wall of the Chelungpu thrust.The restored cross-sections indicate that during its propagation toward the foreland the Chelungpu thrust originally was a low-angle thrust before it met a pre-existing high-angle normal fault, which was then reactivated and became the frontal ramp of the thrust. In the latest stage, displacement along the Changhua thrust left the normal fault behind and kept it underneath the common décollement.The subsurface geometry of the Chelungpu thrust is a uniform curved plane striking N-S, with some local wavy features and a ramp striking E-W Terr. Atmos. Ocean. Sci., Vol. 18, No. 2, June 2007 144 in the northern part of the thrust. To the north of the ramp, the fault plane transforms into a spoon-shaped geometry. In the southern part of the study area, the southern end of the Chelungpu thrust is cut off, and its displacement is transferred into a splay thrust that strikes NE-SW and connects the Chelungpu and Shuangtung-Hsiaomao thrusts.At the hypocenter of the Chi-Chi earthquake, not only is the dip angle of the décollement of the Chelungpu thrust gentler, but the depth much shallower than that of the mainshock. As the hypocenter of the mainshock is very close to the pre-existing normal fault underneath the décollement, a connection between them is highly implied. We also suggest that the ramp in the northern part of the Chelungpu thrust provides a stronger strain guide during the subsurface rupture propagation thereby creating the bended surface rupture.

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Slip history and dynamic implications of the 1999 Chi‐Chi, Taiwan, earthquake

Cited by 187 publications

References 39 publications

Seismogenic faulting of the sedimentary sequence and laterally variable material properties in the Zagros Mountains (Iran) revealed by the August 2014 Murmuri (E. Dehloran) earthquake sequence

Seismogenic faulting of the sedimentary sequence and laterally variable material properties in the Zagros Mountains (Iran) revealed by the August 2014 Murmuri (E. Dehloran) earthquake sequence

Slip history of the 2003 San Simeon earthquake constrained by combining 1‐Hz GPS, strong motion, and teleseismic data

3D Geometry of the Chelungpu Thrust System in Central Taiwan: Its Implications for Active Tectonics

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