Quantification relations between the sourc eparameters

Chen, Peishan; Bai, Tong-xia

doi:10.1007/bf02650539

Cited by 12 publications

(5 citation statements)

References 11 publications

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“…3b), the linear relationship between seismic moments M 0 and local magnitude M L (Fig. 3c) is consistent with other seismologists (Randall, 1973;Chen and Bai, 1992;Hua et al, 2009;Zhao et al, 2011):…”

Section: Scaling Relationsupporting

confidence: 89%

Regional Characteristics of Stress State of Main Seismic Active Faults in Mid‐northern Part of Sichuan‐yunnan Block

Wei

et al. 2017

Chinese J of Geophysics

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We restore the seismic source spectrums of 1012 earthquakes (2.0 ≤ ML ≤ 5.0) in the mid‐northern part of Sichuan‐Yunnan seismic block between January 1, 2009 and December 31, 2015, then calculate the source parameters (e.g., seismic moments M0, focal scale r and stress drop Δσ) and fit the calibration relationship between these parameters. Based on the regional seismic tectonic background, the distribution of active faults and seismicity, the study area is divided into four statistical units. For each unit the stress distribution characteristics, change of stress drop with location, correlation between the stress‐strain loading and the dynamic process of regional deformation, are discussed respectively. The results show that seismic moments M0 are consistent with the magnitude‐moment relation that lgM0 = 0.92ML + 10.46. The relationship between stress drop and magnitude is consistent with the result gained by Nuttli that intraplate earthquake follows the ISD model, with a statistical relationship lgΔσ = 0.31 lgM0 – 3.92. Seismic source stress drop results show the following, (1) The stress at the end of the Jinshajiang fault is low, the overall sliding rate of the fault unit is high, and strong earthquake activity is very rare. In the fault belt consisting of three secondary faults, stress‐strain loading deceases gradually from northwest to southeast along Litang fault, the northwest section which is relatively locked is more likely to accumulate strain than southeast section. (2) Stress drop of Xianshuihe fault zone is divided by Kangding, the southern section is low and northern section is high. Southern section (Kangding‐Shimian) is difficult to accumulate higher strain in the short term, but in northern section (Garzê‐Kangding), moderate and strong earthquakes have not filled the gaps of seismic moment release, there is still a high stress accumulation in partial section. (3) High stress‐drop events were concentrated on Anninghe‐Zemuhe fault zone, strain accumulation of this unit is strong, and stress level is the highest, earthquake risk is high. (4) On Lijiang‐Xiaojinhe fault zone, stress drop characteristics of different magnitude earthquakes are not the same, which is related to complex tectonic setting, the specific reasons still need to be discussed deeply. Stress background in the Muli area is low and may be affected by the local tectonic environment. The study also shows that, (1) Stress drops display a systematic change with different faults and locations, high stress‐drop events occur mostly in the fault intersection area. Faults without locking condition and mainly creeping are mainly characterized by low stress drop. (2) Contrasting to what is commonly thought that “strike‐slip faults are not easy to accumulate stress”, Xianshuihe fault zone and Anninghe‐Zemuhe fault zone all exhibit high stress levels, which may be due to that the magnitude and intensity of medium‐strong earthquakes are not enough to release the accumulated energy. On the other hand, in the complex dynamics of regional d...

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Section: Scaling Relationsupporting

confidence: 89%

Regional Characteristics of Stress State of Main Seismic Active Faults in Mid‐northern Part of Sichuan‐yunnan Block

Wei

et al. 2017

Chinese J of Geophysics

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“…CL, Cw and C~ are constants associated with the rupture length, and can be determined from observational materials (Chen, Bai, 1991). CL, Cw and C~ are constants associated with the rupture length, and can be determined from observational materials (Chen, Bai, 1991).…”

Section: Lcolco Co /Co Co>comentioning

confidence: 99%

The space and time distribution characteristics of the shear stress field for the sequence of the Wuding earthquake

et al. 2000

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Follow Chen and Duda's model of spectral fall-off of co 3, the dependence of peak parameters of ground motion, peak displacement dm, peak velocity Vm and peak acceleration am, upon the environment stress r0-values are studied using near source seismic digital recordings for the sequence of the Wuding, Yunnan, M = 6.5 earthquake, in which, as a new thought, the peak parameters are assumed to be related to the medium Q-value. Three formulae for estimating the environment stress r0-values by the peak parameters of three types of ground motions are derived. Using these formulae, the environment stress to-values are calculated for the sequence of the Wuding earthquake. The result show that to-values calculated by the three formulae are constant largely, the averages of ro are in the range of 5.0-35 MPa for most earthquakes. It belongs to the high-stress earthquakes sequence: the high-stress values are restricted to the relatively small area closely near to the epicenter of the main shock. The fine distribution structure for the contours of the environment stress to-values is related closely to the strong aftershocks. The analysis of spatial and temporal feature of to-values suggests that the earthquakes sequence in a rupture process generated at the specific intersection zone of seismo-tectonics under high-stress background.Key words: digital seismogram peak parameters of ground motion near-source environment stress characteristics seismic sequence of Wuding earthquake *

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“…Having not measured Mo of some earthquakes, we used relation between long period surface wave magnitude Ms and Mo (Chen and Bai, 1991) …”

Section: Momentioning

confidence: 99%

Ambient tectonic shear stress field in Southern California and seismic hazard regions

et al. 1998

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According to the fracture mechanics rupture model of earthquakes put forward by us, several equations to compute tectonic ambient shear stress value r 0 have been derived [equations (1), (2), (3), (5)]. r 0 values for intermediate and small earthquakes occurred in Chinese mainland and Southern California have been calculated by use of these equations. The results demonstrate that the level and distribution of r 0 are closely related to the location where large earthquakes will occur, i.e. the region with higher level of r 0 will be prone to occur large earthquakes and the region with lower level will usually occur small earthquakes. According to the spatial distribution of %, the seismic hazard regions or the potential earthquake source regions can in some degree be determined. According to the variation of r 0 with time, the large earthquake occurrence time can be roughly estimated. According to the distribution of r 0 in Southern California and variation with time, three high stress level regions are determined, one (Goldfield area) of them is the present seismic hazard region. Key words: tectonic ambient shear stress fieldSouthern California seismic hazard region potential earthquake source region ACTA SEISMOLOGICA SINICA Vol. 11 had pointed out prior to the earthquake occurrence, only one failed to declare (Chen et al., 1995).

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Quantification relations between the sourc eparameters

Cited by 12 publications

References 11 publications

Regional Characteristics of Stress State of Main Seismic Active Faults in Mid‐northern Part of Sichuan‐yunnan Block

Regional Characteristics of Stress State of Main Seismic Active Faults in Mid‐northern Part of Sichuan‐yunnan Block

The space and time distribution characteristics of the shear stress field for the sequence of the Wuding earthquake

Ambient tectonic shear stress field in Southern California and seismic hazard regions

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