Earthquake relocation and 3-dimensional crustal structure of P-wave velocity in cen-tral-western China

Yang, Zhixian; Yu, Xilong; Zheng, Yong; Chen, Yun-Tai; Xiao-xi, NI; Chan, W. W.

doi:10.1007/bf03191391

Cited by 10 publications

(16 citation statements)

References 12 publications

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“…In our research, 97.84 percent of aftershocks depth ranged from 0 km to 20 km. This result is consistent with other researches (Zhu et al, 2008;Huang et al, 2008;Chen et al, 2009;Yang et al, 2004).…”

Section: Results Of Double Difference Relocationsupporting

confidence: 96%

“…The west of Longmenshan region is Songpan-Garze fold belt and east of the region is Sichuan Basin of which the crust is hard. Some researches (Yang et al, 2004) showed that earthquakes located in central and western regions of China usually happened in upper and middle of curst, and the depth of earthquake is no more than 20 km. In our research, 97.84 percent of aftershocks depth ranged from 0 km to 20 km.…”

Section: Results Of Double Difference Relocationmentioning

confidence: 99%

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Relocation of aftershocks of the Wenchuan M S 8.0 earthquake and its implication to seismotectonics

2011

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From 14:28 (GMT+8) on May 12th, 2008, the origin time of MS8.0 Wenchuan earthquake, to December 31th, 2008, more than 10 000 aftershocks (M ≥2.0) had been recorded by the seismic networks in Sichuan and surrounding areas. Using double difference algorithm, the main shock and more than 7 000 aftershocks were relocated. The aftershocks distribute about 350 km long. The depths of aftershocks are mainly between 10 km and 20 km. The average depth of aftershocks is about 13 km after relocation. In the southwest, the distribution of aftershocks is along the back-range fault, the central-range fault and the front-range fault of Longmenshan faults. In the middle, the distribution of aftershocks is along the central-range fault. In the north, aftershocks are relocated along the Qingchuan-Pingwu fault. Relocations suggest that the back-range fault mainly induced and controlled the aftershock occurrence in the northern section of aftershocks sequence. The MS8.0 main shock is between central-range and front-range of Longmenshan faults and is near the shear plane of the fault bottom. From the depth distribution of aftershock sequence, it suggests that these three faults show imbricate thrust structure.

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Section: Results Of Double Difference Relocationsupporting

confidence: 96%

Section: Results Of Double Difference Relocationmentioning

confidence: 99%

Relocation of aftershocks of the Wenchuan M S 8.0 earthquake and its implication to seismotectonics

2011

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“…Travel time differences are predicted using a 1-D layered velocity model used for relocations in this study ( Table 1). The 1-D layered seismic wave velocity model used for predicting the travel time differences is based on previous studies of seismic wave velocity structure for the study region (Zhao et al, 1987(Zhao et al, , 1997Yang et al, 2004). This model is appropriate for the purpose for predicting the travel time differences because the DD algorithm is a relative earthquake location method which is much less dependent on the models, compared with "absolute" methods (Waldhauser and Ellsworth, 2000).…”

Section: Earthquake Relocationmentioning

confidence: 99%

Double-difference relocation of earthquakes in central-western China, 1992–1999

et al. 2005

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The double-difference earthquake location algorithm was applied to the relocation of 10,057 earthquakes that occurred in central-western China (21 • N to 36 • N, 98 • E to 111 • E) during the period from 1992 to 1999. In total, 79,706 readings for P waves and 72,169 readings for S waves were used in the relocation. The relocated seismicity (6,496 earthquakes) images fault structures at seismogenic depths that are in close correlation with the tectonic structure of major fault systems expressed at the surface. The new focal depths confirm that most earthquakes (91%) in this region occur at depths less than 20 km.

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“…Physical constants such as the P-wave velocity, Poisson's ratio, and the density, applied to each element are summarized in Table 2, where the Poisson's ratio and density are assumed to be constant. In the present study, we have constructed two P-wave velocity models, namely Models Vp-1 and Vp-2, taking into consideration the measured P-wave velocities of the boring core samples and a P-wave velocity model used for earthquake locations (Yang, Z.-X. et al, 2004) in order to check the effect of the difference of the velocity models.…”

Section: Effect Of Landscape Topography On the Stress State At Shallomentioning

confidence: 99%

Stress state along the Anninghe-Zemuhe fault zone, southwestern China, estimated from an array of stress orientation measurements with a new method

et al. 2012

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Measurements of in-situ stress orientations at relatively shallow depths were conducted at 11 sites along the Anninghe-Zemuhe fault zone, southwestern China, with a newly developed method. The Anninghe fault in the fault zone has been considered to have a potential for a large earthquake with a magnitude of about 7.5, while the Zemuhe fault shows very little such potential. The present study has mainly two objectives: one is to show new data of the spatial distribution of the stress orientations around the fault zone, which is obtained directly from the measurements; the other is to examine the possibility to detect a stress pattern in relation to the past activities of earthquakes along the fault zone. The observed principal stress orientations are distributed between the NNW-SSE and NW-SE directions, which is consistent with the earthquake focal mechanism solutions near the fault zone. On the other hand, it is unclear whether the observed stress pattern is related to past activities of the fault zone, since the data uctuation was too large to determine this. We note that the stress orientations are favorable for slip on the Anninghe fault, while being unfavorable on the Zemuhe fault, from the present experimental data. Key words: The Anninghe-Zemuhe fault zone, in-situ stress measurements, new technique, laser displacement sensor, active fault, earthquake forecasts. Recent observations of stress states on other faults after large earthquakes fall into two viewpoints: one is that stress

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Earthquake relocation and 3-dimensional crustal structure of P-wave velocity in cen-tral-western China

Cited by 10 publications

References 12 publications

Relocation of aftershocks of the Wenchuan M S 8.0 earthquake and its implication to seismotectonics

Relocation of aftershocks of the Wenchuan M S 8.0 earthquake and its implication to seismotectonics

Double-difference relocation of earthquakes in central-western China, 1992–1999

Stress state along the Anninghe-Zemuhe fault zone, southwestern China, estimated from an array of stress orientation measurements with a new method

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