Determination of Q β(f) in Different Parts of Kumaon Himalaya from the Inversion of Spectral Acceleration Data

Joshi, A.; Kumar, Parveen; Mohanty, Manoranjan; Bansal, A. R.; Dimri, V. P.; Chadha, R. K.

doi:10.1007/s00024-011-0421-0

Cited by 21 publications

(6 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…investigated the lapse time dependencies of coda waves in the Kumaon Himalaya; their study revealed that by increasing the lapse time window from 20 to 50 s, Q 0 (Q c at 1 Hz) increases from 64 2 to 230 19, whereas the frequency-dependent parameter n decreases from 1.08 to 0.81. found that the frequency-dependent relationships of quality factors for P and S waves were Q P 22 5f 1:350:04 and Q S 104 10f 1:30:03 , respectively, in the Kumaon Himalaya. Joshi et al (2012) computed the regional attenuation near the Pithoragarh region in the Kumaon Himalaya as Q β f 29 1:2f 1:10:06 .…”

Section: Introductionmentioning

confidence: 99%

“…The approach suggested by Joshi (2006a) and subsequently modified by Joshi et al (2012) was applied to calculate the Q β f. Forty events recorded at 16 stations were utilized for the present work. The input parameters, such as seismic moment and corner frequency, are calculated from the inversion algorithm.…”

Section: Introductionmentioning

confidence: 99%

“…The software QINV developed by Joshi (2006a) and subsequently modified by Joshi et al (2012) was used in the present study. Seismic moment is one of the most important parameters required as input to the present algorithm.…”

mentioning

confidence: 99%

“…Computed values of seismic moment at different stations were used to calculate the average seismic moment for each event. The initial value of Q β f given by Joshi et al (2012) for the Kumaon region was used for obtaining source spectra. The inputs of the first part of inversion were (1) the average value of the seismic moment computed from two horizontal components recorded at several stations, (2) the spectra of the S phase in the acceleration record, and (3) values of the corner frequency, which was selected iteratively.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Detailed Attenuation Study of Shear Waves in the Kumaon Himalaya, India, Using the Inversion of Strong‐Motion Data

Kumar¹,

Joshi²,

Sandeep³

et al. 2015

Bulletin of the Seismological Society of America

Self Cite

View full text Add to dashboard Cite

The frequency-dependent shear-wave quality factor Q β f of the seismically active Kumaon Himalaya was calculated using strong-motion data recorded between 2006 and 2012. The inversion algorithm of strong-motion data, developed here, simultaneously gives the shear-wave quality factor and the site effect for each earthquake. The site effects obtained from the present inversion are within the standard limit of error and agree with those obtained through the H/V technique (H/V being the ratio of the Fourier spectra of the horizontal and vertical components of the record). The Q β f values (in which Q β is shear-wave quality factor and f is frequency) at different stations were computed using both the north-south and east-west components of acceleration records. The Q β f values obtained from both components at 16 stations in the Kumaon Himalaya were used to compute a regional Qf relationship having the form Q β f 28 2:0f 1:20:07 . This Qf relationship suggests a low Q 0 value (< 200) and a high n value (> 0:8) for tectonically and seismically active regions.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Detailed Attenuation Study of Shear Waves in the Kumaon Himalaya, India, Using the Inversion of Strong‐Motion Data

Kumar¹,

Joshi²,

Sandeep³

et al. 2015

Bulletin of the Seismological Society of America

Self Cite

View full text Add to dashboard Cite

show abstract

“…The approach suggested by Joshi (2006a) and subsequently modified by Joshi et al (2012) was applied to calculate the Qβ(f) and source parameters. The greatest advantage of this method is its accuracy and rapidness.…”

Section: Introductionmentioning

confidence: 99%

Estimation of Quality Factor (Qβ) Using Accelerograms of Ahar-Varzaghan Earthquakes, Northwestern Iran

Mahood

Amiri

2017

IJGE

View full text Add to dashboard Cite

High-frequency strong-motion data of two recent major earthquakes in the Ahar-Varzaghan region, Northwestern Iran, have been used to determine shear-wave quality factor (Qβ (f )) and seismic source parameters. Data from a local array of 12 stations, two main shocks (Ahar-Varzaghan doublet earthquakes (Mw 6.4 and 6.3) on August 11, 2012), and 38 aftershocks of magnitude 4.1 -5 were analyzed. The classic Brune model is used to predict the shape of the source spectrum and to provide scaling relationships between spectral and source parameters. In order to obtain reliable estimates of the source spectrum, the effects of attenuation need to be estimated and corrected. By using an inversion algorithm in this work, an average relation in the form Qβ = (114 ± 21) f (0.90 ± 0.07) is obtained. The best fit theoretical spectrum provides final values of source parameters, i.e. seismic moment Mo and corner frequency fc as 3.19 × 10 25 dyne cm and 0.69 Hz, respectively, for the first event. Obtained Q(f) relationship suggests a low Qo value (< 200) and a high n value (> 0.8) for high heterogeneous, tectonically and seismically active regions.

show abstract

Assessment of Site Amplification Using Borehole and Surface Data: Variability of Site Effect Estimation from Different Phases of the Accelerogram

Kumar¹,

Sandeep²,

Monika³

2021

Lecture Notes in Civil Engineering

View full text Add to dashboard Cite

Determination of Q β(f) in Different Parts of Kumaon Himalaya from the Inversion of Spectral Acceleration Data

Cited by 21 publications

References 20 publications

Detailed Attenuation Study of Shear Waves in the Kumaon Himalaya, India, Using the Inversion of Strong‐Motion Data

Detailed Attenuation Study of Shear Waves in the Kumaon Himalaya, India, Using the Inversion of Strong‐Motion Data

Estimation of Quality Factor (Qβ) Using Accelerograms of Ahar-Varzaghan Earthquakes, Northwestern Iran

Assessment of Site Amplification Using Borehole and Surface Data: Variability of Site Effect Estimation from Different Phases of the Accelerogram

Contact Info

Product

Resources

About