Complexity of the coseismic rupture for 1999 Chi-Chi Earthquake (Taiwan) from inversion of GPS observations

Wang, Weimin; He, Yumei; Yao, Zhen‐Xing

doi:10.1016/j.tecto.2004.01.005

Cited by 17 publications

(4 citation statements)

References 28 publications

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“…Finite-fault inversion methods have been developed over the last 40 years to study the rupture process of large earthquakes, from which we can obtain the detailed mapping of the slip distribution using teleseismic broadband waveform (Olson and Apsel 1982;Hartzell and Heaton 1983;Hartzell and Liu 1996;Ji et al 2002;Wang et al 2004;Lay et al 2010;Wei et al 2013;Avouac et al 2014;Yagi et al 2016;Ye et al 2016). Ji et al (2002) proposed a waveform inversion approach using wavelet transform and a simulated annealing algorithm, in which the parameters of each subfault, such as the slip amplitude, the slip direction, the rake angle, the rupture velocity and the slip rate function, can be inverted simultaneously.…”

Section: Methodsmentioning

confidence: 99%

Rupture processes and Coulomb stress changes of the 2017 Mw 6.5 Jiuzhaigou and 2013 Mw 6.6 Lushan earthquakes

Lin

Chu

Zeng

2019

Earth Planets Space

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Since the 2008 great M w 7.9 Wenchuan earthquake, two destructive earthquakes, the 2013 M w 6.6 Lushan earthquake and the 2017 M w 6.5 Jiuzhaigou earthquake, struck the eastern margin of the Tibetan Plateau, causing many casualties and significant property damage. The rupture processes and Coulomb stress change of the Lushan and Jiuzhaigou earthquakes are investigated in this study. The general patterns of the slip models of the two events are similar, where the slip is concentrated around the hypocenter and the primary ruptured zone extends about 20 km along strike. The rupture zone of the 2017 Jiuzhaigou earthquake spans a depth range of 4-16 km with a peak slip of ~ 115 cm, whereas the rupture zone of the 2013 Lushan earthquake is concentrated at 8 to 20 km depth with a peak slip of 125 cm. The coseismic static Coulomb stress changes induced by the two events are computed with the obtained slip models. The Tazang fault and the northern extremities of the Minjiang and Huya faults were strongly loaded by the Jiuzhaigou earthquake, whereas the Lushan earthquake mainly affected its surrounding faults. Therefore, we infer that the seismic hazard potential in these regions has probably been increased further, and the Lushan earthquake did not contribute significantly the occurrence of the Jiuzhaigou earthquake. Additionally, we also compute the stress changes imparted by the 2008 Wenchuan earthquake. The computed stress changes in both events' hypocenters exceed the trigger threshold (0.1 bar), which suggests that the Wenchuan earthquake played a pivotal role in the occurrence of these two earthquakes.

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Section: Methodsmentioning

confidence: 99%

Rupture processes and Coulomb stress changes of the 2017 Mw 6.5 Jiuzhaigou and 2013 Mw 6.6 Lushan earthquakes

Lin

Chu

Zeng

2019

Earth Planets Space

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“…Two hours after the earthquake, we could retrieve the broadband seismograms from the IRIS (Incorporated Research Institutions for Seismology) Data Management Center and choose the stations at epicentral distances between 30° and 90°. Based on a finite-fault model [5][6][7][8], we can characterize the source mechanism by a waveform inversion method that involves two steps. First, a point source model is used to determine the strike, slip and rake angles of two planes and the source depth.…”

Section: Methodsmentioning

confidence: 99%

Source process of the 2011 M w9.0 Tohuko Japan earthquake

Hao

Wang

Yao

2011

Sci. China Earth Sci.

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“…The experimental study of the evolution of earthquake ruptures is of great significance for understanding the underlying physical process of earthquake preparation and occurrence. Geological surveys and field observation data showed that fault geometry plays important roles in the initiation and propagation of earthquake ruptures [1][2][3][4][5][6][7][8]. Numerical simulations analyzed the influences of the fault bend on the rupture process and the fault slip distribution, which revealed that the angle of the fault bend, the normal stress, and the loading mode play important roles in the initiation and propagation of the ruptures [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Laboratory Observations of Repeated Interactions between Ruptures and the Fault Bend Prior to the Overall Stick-Slip Instability Based on a Digital Image Correlation Method

2019

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Fault geometry plays important roles in the evolution of earthquake ruptures. Experimental studies on the spatiotemporal evolution of the ruptures of a fault with geometric bands are important for understanding the effects of the fault bend on the seismogenic process. However, the spatial sampling of the traditional point contact type sensors is quite low, which is unable to observe the detailed spatiotemporal evolution of ruptures. In this study, we use a high-speed camera combined with a digital image correlation (DIC) method to observe ruptures during stick-slip motions of a simulated bent fault. Meanwhile, strain gages were also used to test the results of the DIC method. Multiple cycles of the alternative propagation of ruptures between the two fault segments on the both sides of the fault bend were observed prior to the overall failure of the fault. Moreover, the slip velocity and rupture speed were observed getting higher during this process. These results indicate the repeated interactions between the ruptures and the fault bend prior to the overall instability of the fault, which distinguishes the effect of the fault bend from the effect of asperities in straight faults on the evolution of ruptures. In addition, improvement in the temporal sampling rate of the DIC measurement system may further help to unveil the rupture evolution during the overall instability in future.

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Complexity of the coseismic rupture for 1999 Chi-Chi Earthquake (Taiwan) from inversion of GPS observations

Cited by 17 publications

References 28 publications

Rupture processes and Coulomb stress changes of the 2017 Mw 6.5 Jiuzhaigou and 2013 Mw 6.6 Lushan earthquakes

Rupture processes and Coulomb stress changes of the 2017 Mw 6.5 Jiuzhaigou and 2013 Mw 6.6 Lushan earthquakes

Source process of the 2011 M w9.0 Tohuko Japan earthquake

Laboratory Observations of Repeated Interactions between Ruptures and the Fault Bend Prior to the Overall Stick-Slip Instability Based on a Digital Image Correlation Method

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