Simulation of the Jiuzhaigou, China, earthquake by stochastic finite-fault method based on variable stress drop

Owing to the simulated ground motion energy distribution by stochastic finite-fault method is not reasonable, near-field bedrock strong ground motion acceleration time histories are used to study. Fourier transform is adapted to analysis the variation of the energy accumulation curve with frequency. The results show that the record energy accumulation curve is a steep rise curve, 80% of total energy of the vertical ground motion is concentrated on the 2.5-15Hz, while the horizontal is mainly concentrated on the 2-11Hz. An improved stochastic finite-fault method is proposed by multiplying an amplification factor in some frequency. The results show that multiplying an amplification factor, the simulated acceleration energy accumulation curve matches to the record acceleration energy accumulation curve, and the peak of simulated acceleration response spectrum tends to the record acceleration value.

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Nonlinear Response Potential of Real versus Simulated Ground Motions for the 11 March 2011 Tohoku-oki Earthquake

Earthquake Spectra ◽

10.1193/071213eqs201m ◽

2015 ◽

Vol 31 (3) ◽

pp. 1711-1734 ◽

Cited By ~ 6

Author(s):

Katsuichiro Goda ◽

Susumu Kurahashi ◽

Hadi Ghofrani ◽

Gail M. Atkinson ◽

Kojiro Irikura

Keyword(s):

Nonlinear Response ◽

Main Shock ◽

Strong Motion ◽

Motion Generation ◽

Demand Curves ◽

Finite Fault ◽

Time Histories ◽

Ground Motion Records ◽

Finite Fault Method ◽

Simulated Ground Motions

This study compares the nonlinear response potential of generic inelastic single-degree-of-freedom systems subjected to three sets of ground motion records for the 2011 Tohoku main shock. The compared record sets, all for the same sites, are: (1) observed accelerograms at 48 KiK-net strong motion stations; (2) time-histories simulated from the empirical Green's function method; and (3) time-histories simulated using the stochastic finite-fault method (with multiple sub-events). The adopted techniques can capture a realistic source rupture process involving multiple strong motion generation areas in simulations. Statistical analysis of computed peak ductility demands for the three record sets is conducted via cloud and stripe analyses. Results indicate that for the 2011 Tohoku main shock, different record sets produce similar average trends of the inelastic seismic demand curves. This conclusion is applicable to both cloud and stripe approaches and to structural systems with degrading and pinching hysteresis.

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Deterministic Investigation of Effect of Stress Drop on Seismic Site Response Analysis of Allahabad City

10.21203/rs.3.rs-32328/v1 ◽

2020 ◽

Author(s):

Keshav Kumar Sharma ◽

Kumar Pallav ◽

Shashi Kant Duggal

Keyword(s):

Stress Drop ◽

Site Response ◽

High Stress ◽

Site Response Analysis ◽

Response Analysis ◽

Contour Plot ◽

Spectral Acceleration ◽

Ground Acceleration ◽

Seismic Site Response ◽

Finite Fault

Abstract Due to the high stress of Faizabad ridge close to Allahabad city and the absence of strong-motion records for any engineering studies, it is essential to use a stochastic model to study the deterministic earthquake scenario of Allahabad city. The work investigates the effect of stress drop for an earthquake on 30 sites (83 boreholes) located across the city using 1-D seismic site response analysis. The ground motion has been simulated for Allahabad fault using stochastic finite fault model for stress drop ranges from ~70 bar to ~200 bars. Simulation results show the Peak Ground Acceleration (PGA) value of 0.026 g and 0.085 g at 70 and 200 bars stress drops, respectively. Site response results reveal that Indian Standard IS: 1893-2002 underestimates the PGA at higher stress drop compared to the estimated spectral acceleration values. Further, the lower stress drop can give a higher mean spectral acceleration at a long-period. Contour plot of surface-level PGA, low and high period spectral acceleration with response spectra for Allahabad city shows the variation with stress drop.

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Stochastic finite-fault method controlled by the fault rupture process

MethodsX ◽

10.1016/j.mex.2020.100798 ◽

2020 ◽

Vol 7 ◽

pp. 100798

Author(s):

Hong Zhou ◽

Ying Chang

Keyword(s):

Rupture Process ◽

Fault Rupture ◽

Finite Fault ◽

Finite Fault Method

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Earthquake time histories compatible with the 2005 National building code of Canada uniform hazard spectrum

Canadian Journal of Civil Engineering ◽

10.1139/l09-044 ◽

2009 ◽

Vol 36 (6) ◽

pp. 991-1000 ◽

Cited By ~ 73

Author(s):

Gail M. Atkinson

Keyword(s):

Ground Motions ◽

Time History ◽

Building Code ◽

Site Condition ◽

Period Range ◽

Uniform Hazard Spectrum ◽

Finite Fault ◽

Time Histories ◽

Finite Fault Method ◽

Site Classes

The seismic design provisions of the 2005 National building code of Canada (NBCC) (NRC 2005) describe earthquake ground motions for which structures are to be designed in terms of a uniform hazard spectrum (UHS) having a 2% chance of being exceeded in 50 years. The “target” UHS depends on location and site condition, where site condition is described by a classification scheme based on the time-averaged shear-wave velocity in the top 30 m of the deposit. For some applications, such as dynamic analysis by time history methods, it is useful to have time histories that represent the types of earthquake motions expected and match the target UHS from the NBCC over some prescribed period range. In this study, the stochastic finite-fault method is used to generate earthquake time histories that may be used to match the 2005 NBCC UHS for a range of Canadian sites. Records are provided for site classes A, C, D, and E. They are freely available at www.seismotoolbox.ca .

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Ground motion modelling in northwestern Himalaya using stochastic finite-fault method

Natural Hazards ◽

10.1007/s11069-020-04068-8 ◽

2020 ◽

Vol 103 (2) ◽

pp. 1989-2007

Author(s):

Ramees R. Mir ◽

Imtiyaz A. Parvez

Keyword(s):

Ground Motion ◽

Finite Fault ◽

Ground Motion Modelling ◽

Finite Fault Method

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Application of stochastic finite-fault method to marine earthquake : 2021 Fukushima earthquake in Japan

10.1109/ichceswidr54323.2021.9656290 ◽

2021 ◽

Author(s):

Wanjun Ma ◽

Penfei Dang ◽

Zhinan Xie ◽

Jianqi Lu

Keyword(s):

Finite Fault ◽

Finite Fault Method

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3-D joint geodetic and strong-motion finite fault inversion of the 2008 May 12, Wenchuan, China Earthquake

Geophysical Journal International ◽

10.1093/gji/ggaa239 ◽

2020 ◽

Vol 222 (2) ◽

pp. 1390-1404

Author(s):

Leonardo Ramirez-Guzman ◽

Stephen Hartzell

Keyword(s):

Time Window ◽

Joint Inversion ◽

Strong Motion ◽

Multiple Time ◽

Source Inversion ◽

Geodetic Inversion ◽

Finite Fault Inversion ◽

Finite Fault ◽

China Earthquake ◽

The Moment

SUMMARY We present a source inversion of the 2008 Wenchuan, China earthquake, using strong-motion waveforms and geodetic offsets together with 3-D synthetic ground motions. We applied the linear multiple time window technique considering geodetic and dynamic Green's functions computed with the finite-element method and the reciprocity and Strain Green's Tensor formalism. All ground motion estimates, valid up to 1 Hz, accounted for 3-D effects, including the topography and the geometry of the Beichuan and Pengguan faults. Our joint inversion has a higher moment (M0) than a purely geodetic inversion and the slip distribution presents differences when compared to 1-D model source inversions. The moment is estimated to be M0 = 1.2 × 1021 N·m, slightly larger than other works. Our results show that considering a complex 3-D structure reduces the size of large areas of 10 m slip or greater by distributing it in wider zones, with reduced slips, in the central portion of the Beichuan and the Pengguan faults. Finally, we compare our source with a relocated aftershock catalogue and conclude that the 4–5 m slip contours approximately bound the absence or presence of aftershocks.

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The near-source ground motion of the 6 August 1979 Coyote Lake, California, earthquake

Bulletin of the Seismological Society of America ◽

10.1785/bssa0730010201 ◽

1983 ◽

Vol 73 (1) ◽

pp. 201-218

Author(s):

Hsui-Lin Liu ◽

Donald V. Helmberger

Keyword(s):

Ground Motion ◽

Stress Drop ◽

Personal Communication ◽

Source Model ◽

Total Moment ◽

Motion Data ◽

Rupture Length ◽

Finite Fault ◽

Source Data ◽

Strong Ground

abstract A finite fault striking N24°W and extending to a depth of 10 km is proposed to explain the strong ground motion data for the 6 August 1979 Coyote Lake, California, earthquake (ML = 5.9). Our source model suggests that right-lateral faulting initiated at a depth of 8 km and ruptured toward the south with a velocity of 2.8 km/sec. This unilateral rupture can explain the large displacement recorded south of the epicenter. However, the waveform coherency across an array south and southwest of the epicenter suggests that the rupture length is less than 6 km. The maximum dislocation is about 120 cm in a small area near the hypocenter, and the total moment is estimated to be 3.5 ×1024 dyne-cm. An abrupt stopping phase which corresponds to a deceleration of right-lateral motion can explain the high peak acceleration recorded at array station 6. The stress drop in the hypocentral area is about 140 bars; the average stress drop over the entire rupture surface is 30 bars. The preferred finite-source model can predict the Pn1 waveforms and the beginning features in the teleseismic seismograms. No clear arrivals can be observed in the near-source data for the possible second and third smaller events suggested by Nabelek (personal communication).

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