Estimation of Coda Wave Attenuation for the National Capital Region, Delhi, India Using Local Earthquakes

Mohanty, William K.; Prakash, Rajesh; Suresh, G.; Shukla, Archana; Walling, M. Yanger; Srivastava, J. P.

doi:10.1007/s00024-009-0448-7

Cited by 28 publications

(10 citation statements)

References 37 publications

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“…Attenuation variations in the earth are usually greater than the velocity variations. Attenuation studies in time or frequency domain are carried out by using either natural or artificial sources, or by various methods considering body or surface waves (MITCHELL, 1975;CORREIG and MITCHELL, 1980;ROECKER et al, 1982;PULLI, 1984;IBANEZ et al, 1990;MOHANTY et al, 2009;MUKHOPADHYAY and SHARMA, 2010;FORD et al, 2010;SHARMA et al, 2011). Low value of Q (Q \ 200) is associated with the tectonically and seismically active regions, while high value of Q (Q [ 600) is characterized of seismically inactive and stable regions.…”

Section: Introductionmentioning

confidence: 99%

“…In this study, the single scattering model for coda waves is used. Seismic wave attenuation studies in the world by single scattering model show good correlation with the seismicity of the regions (ZENG et al, 1997;TITZSCHKAU et al, 2010;MOHANTY et al, 2009;PAUL et al, 2003;SHARMA et al, 2008). This is the first study of coda wave attenuation which uses a single back-scattering model along the EAFZ.…”

Section: Introductionmentioning

confidence: 99%

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Estimation of Coda Wave Attenuation in the East Anatolia Fault Zone, Turkey

Sertçelik

2011

Pure Appl. Geophys.

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In this study, the attenuation of coda waves Q c (f) has been estimated for different lapse times and frequencies in the East Anatolia Fault Zone (EAFZ) in Turkey using a single back-scattering model of S-coda envelopes. The data include 255 earthquakes recorded by ten stations. The frequency-dependent Q c values are estimated at central frequencies of 1.5, 3, 6, 8, 12, and 18 Hz using 20-30-40 s lapse time windows. Along this fault zone, the frequency-dependent Q c obtained for all data and lapse time is Q c = 57.5f 0.82 . The entire study area is divided into six subregions according to the magnitude of the earthquakes and the location of the fault segments. The estimated average frequency-dependent relation for all lapse times are; Q c I ð Þ ¼ 34:3f 0:93 for Bingöl-KarliovaErzincan triple junction; Q c II ð Þ ¼ 56:3f 0:71 for Bingol-Lake Hazar segment; Q c III ð Þ ¼ 68:5f 0:75 for Lake Hazar-Sincik segment; Q c IV ð Þ ¼ 72:5f 0:78 Hazar-Sincik and Ç elikhan-Gölbaşı faults; Q c V ð Þ ¼ 59:7f 0:87 for Kahramanmaras triple junction and Q c VI ð Þ ¼ 67:4f 0:94 for Amanos Range and Karasu Basin. The lowest Q c is determined between Bingol and Malatya. The highest Q c value is along Amanos Range. In addition, Q c values are calculated for each regions at different lapse times. The average Q c value of the study region varies from 53 ± 11 at 1.5 Hz to 498 ± 41 at 18 Hz for 20 s lapse time window, as its variation is from 116 ± 11 at 1.5 Hz to 749 ± 75 at 18 Hz of central frequency for 40 s lapse time window. The increase of Q c with lapse times changes from one subregion to another along the fault zone. The rate of increment is significantly higher in Bingöl-Karliova-Erzincan triple junction than in the other subregions. This rapid increase of low Q c values in the junction reaches the general attenuation characteristics of the fault at 40 s lapse time. Finally, the low Q 0 and high n values can be attributed to the energy loss as a result of the heterogeneity and activity along the fault zone. The increase of Q c with frequency, lapse time may be related to heterogeneity decreases with depth. The rapid increase of Q c with depth in Bingöl-Karliova-Erzincan triple junction may be interpreted that the effect of the Northern Anatolian Fault Zone is effective in the upper crust is not so deep compared to EAFZ.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Estimation of Coda Wave Attenuation in the East Anatolia Fault Zone, Turkey

Sertçelik

2011

Pure Appl. Geophys.

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“…Peak ground acceleration can be used to represent the intensity level of each site and can be estimated by attenuation relationships using magnitude, distance, and other aspects of ground motion (Edwards et al 2015;Yu 2015). Many countries have developed empirical attenuation relationships for PGA by using motion data from historical earthquakes (Albarello and D'Amico 2004;Mohanty et al 2009), and these relationships can be used to estimate the degree of ground shaking during an earthquake.…”

Section: Earthquake Hazard Simulationmentioning

confidence: 99%

Seismic Risk Assessment of the Railway Network of China’s Mainland

Zhu

Wang

et al. 2020

Int J Disaster Risk Sci

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Earthquakes pose a great risk to railway systems and services around the world. In China alone, earthquakes caused 88 rail service disruptions between 2012 and 2019. Here, we present a first-of-its-kind methodology to analyze the seismic risk of a railway system using an empirically derived train service fragility curve. We demonstrate our methodology using the Chinese railway system. In doing so, we generate a set of stochastic earthquake scenarios for China based on a national-scale seismicity model. Using disruption records, we construct an empirically grounded fragility curve that relates the failure probability of train services to peak ground acceleration. By combining the simulated earthquakes, the fragility curve, and empirical train flow data from 2016, we quantitatively assess the seismic impact and the risk faced by the Chinese railway system. The maximum train trip loss could reach 2400 trips in response to a single seismic event, accounting for 34% of the national daily train trips. Due to the spatially uneven daily train flow and seismicity distribution, the seismic impact on the railway system in different seismic zones is highly heterogeneous and does not always increase when the hazard intensity increases. More specifically, the results show that the railway lines located in the Qinghai-Tibet and Xinjiang seismic zones exhibit the highest risk. The generated impact curves and the risk map provide a basis for railway planning and risk management decisions.

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“…The parameters are used from the work of Singh et al [29] and Mitra [30]. The Stress drop for Indo-Gangetic Plains (IGP) is taken between 50-200 bars [31]. To achieve high amplitude of Peak Spectral Acceleration (PSA), stress drop values 150 bars the simulation has been estimated.…”

Section: (8)mentioning

confidence: 99%

Seismic Behaviour of 17th Century Khusro Tomb due to Site-Specific Ground Motion

Prasad¹,

Pallav²,

Singh³

2019

TOCIEJ

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Introduction: Site Specific time history analysis is performed on a 17th century old Khusro Tomb built-in 1622 A.D. by Sultan Nisar Begum. It is a beautiful example of Mughal architecture. Methods: A 3-D finite element model is prepared on Ansys Workbench. Gravity analysis results show the behaviour of Tomb due to its geometry and stress variation is plotted in a form of contour. Modal analysis results show the first three frequencies of Khusro Tomb viz., 21.62, 21.68 and 25.38 Hz. In the absence of earthquake record, the stochastic finite fault model is used to generate synthetic site-specific time history to assess the seismic behaviour of the tomb. Results and Conclusion: Time history analysis results shows that the Khusro Tomb's geometrical configuration is adequate to withstand the earthquake due to nearest Allahabad fault. The critical elements of the Tomb are highlighted based on analysis that can be effectively used for the maintenance of the Tomb.

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Estimation of Coda Wave Attenuation for the National Capital Region, Delhi, India Using Local Earthquakes

Cited by 28 publications

References 37 publications

Estimation of Coda Wave Attenuation in the East Anatolia Fault Zone, Turkey

Estimation of Coda Wave Attenuation in the East Anatolia Fault Zone, Turkey

Seismic Risk Assessment of the Railway Network of China’s Mainland

Seismic Behaviour of 17th Century Khusro Tomb due to Site-Specific Ground Motion

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