Rapid afterslip following the 1999 Chi‐Chi, Taiwan Earthquake

Hsu, Yi Chiung; Bechor, N.; Segall, P.; Yu, Sujuan; Kuo, Long-Chen; Fong, Kuo

doi:10.1029/2002gl014967

Cited by 128 publications

(115 citation statements)

References 13 publications

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“…GPS data has been proven as an effective observation to accurately constrain the postseismic process due to its high horizontal precision and time resolution [35][36][37]. Unfortunately, for this event, according to Chen et al [38], there are not enough GPS observations around the earthquake zone.…”

Section: Datamentioning

confidence: 99%

Time-Dependent Afterslip of the 2009 Mw 6.3 Dachaidan Earthquake (China) and Viscosity beneath the Qaidam Basin Inferred from Postseismic Deformation Observations

Liu

et al. 2016

Remote Sensing

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Abstract:The 28 August 2009 Mw 6.3 Dachaidan (DCD) earthquake occurred at the Qaidam Basin's northern side. To explain its postseismic deformation time series, the method of modeling them with a combination model of afterslip and viscoelastic relaxation is improved to simultaneously assess the time-dependent afterslip and the viscosity. The coseismic slip model in the layered model is first inverted, showing a slip pattern close to that in the elastic half-space. The postseismic deformation time series can be explained by the combination model, with a total root mean square (RMS) misfit of 0.37 cm. The preferred time-dependent afterslip mainly occurs at a depth from the surface to about 9.1 km underground and increases with time, indicating that afterslip will continue after 28 July 2010. By 334 days after the main shock, the moment released by the afterslip is 0.91ˆ10 18 N¨m (Mw 5.94), approximately 24.3% of that released by the coseismic slip. The preferred lower bound of the viscosity beneath the Qaidam Basin's northern side is 1ˆ10 19 Pa¨s, close to that beneath its southern side. This result also indicates that the viscosity structure beneath the Tibet Plateau may vary laterally.

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Section: Datamentioning

confidence: 99%

Time-Dependent Afterslip of the 2009 Mw 6.3 Dachaidan Earthquake (China) and Viscosity beneath the Qaidam Basin Inferred from Postseismic Deformation Observations

Liu

et al. 2016

Remote Sensing

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“…We hypothesize that the deep segments of the Wenchuan fault only partially ruptured during the coseismic rupture process and that the slip deficit is released by aftershocks or aseismic afterslip. This phenomenon was demonstrated by Cakir et al (2003) for the Izmit earthquake and Hsu et al (2002) for the Chi-Chi earthquake. Further study on afterslip based on postseismic deformation may provide some evidence for this hypothesis.…”

Section: Resultsmentioning

confidence: 98%

Slip model of the 2008 M w 7.9 Wenchuan (China) earthquake derived from co-seismic GPS data

et al. 2010

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Near-field co-seismic GPS data were used to derive the slip distribution of the 12 May 2008 Wenchuan earthquake. Based on field measurements and geological observations, the earthquake is represented by ruptures on the Beichuan fault and a neighboring fault from Pengxian to Guanxian, both dipping with a decreasing angle with depth. Using a layered elastic crust model, we obtained a slip model that not only best fits the co-seismic GPS data but which also shows general consistency with the surface ruptures observed from the field survey. The slip maxima are dominant at a very shallow depth near Beichuan and Jiangyou, although the exact peak value of the slip distribution is not well constrained due to the inhomogeneous data coverage in the near-fault area. The maximum slip in our inversion is thus limited to about 9 m, as estimated from the field measurement, but no strict restriction is applied to the slip direction, i.e., the rake angle. The slip model yields a moment magnitude that is very close to M w = 7.9, which is the estimate based on teleseismic observations. Near the hypocenter, the slip exhibits reverse behavior. The major rupture near Beichuan involves both right-lateral strike-slip and reverse components. Slip on the secondary fault is dominated by the reverse component with a maximum of approximately 2-3 m.

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“…Alignment arrays installed after the earthquake by the USGS were able to measure the temporal decay of surface afterslip and also indicate variation of aseismic slip distribution along the fault strike, with the largest afterslip occurring along the southern segment . Reports from previous events indicate some temporal afterslip changes (i.e., Hsu et al, 2002Hsu et al, , 2006Freed, 2007) yet lack complete spatial coverage and cross dataset verification. The high-quality datasets for the South Napa earthquake provide a detailed picture of both the spatial and temporal distribution of afterslip and help to distinguish the relative contributions of coseismic and postseismic slip in the observed Interferometric Synthetic Aperture Radar (InSAR) and Global Positioning System (GPS) data.…”

Section: Introductionmentioning

confidence: 99%

The 2014 Mw 6.1 South Napa Earthquake: A Unilateral Rupture with Shallow Asperity and Rapid Afterslip

Wei

Barbot

Graves

et al. 2015

Seismological Research Letters

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Rapid afterslip following the 1999 Chi‐Chi, Taiwan Earthquake

Cited by 128 publications

References 13 publications

Time-Dependent Afterslip of the 2009 Mw 6.3 Dachaidan Earthquake (China) and Viscosity beneath the Qaidam Basin Inferred from Postseismic Deformation Observations

Time-Dependent Afterslip of the 2009 Mw 6.3 Dachaidan Earthquake (China) and Viscosity beneath the Qaidam Basin Inferred from Postseismic Deformation Observations

Slip model of the 2008 M w 7.9 Wenchuan (China) earthquake derived from co-seismic GPS data

The 2014 Mw 6.1 South Napa Earthquake: A Unilateral Rupture with Shallow Asperity and Rapid Afterslip

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