Expected peak ground acceleration in Uttarakhand Himalaya, India region from a deterministic hazard model

Joshi, A.; Mohan, Kapil

doi:10.1007/s11069-009-9373-4

Cited by 16 publications

(8 citation statements)

References 23 publications

(33 reference statements)

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“…1a, b below. The tectonic setup of the study area has been studied quite extensively and is easily available (Joshi and Mohan 2010;Patil et al 2014).…”

Section: Study Areamentioning

confidence: 99%

Estimation of bedrock depth for a part of Garhwal Himalayas using two different geophysical techniques

et al. 2018

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It has now been well established that the depth of bedrock is a key parameter in assessing the impact of local site conditions on seismic hazard analysis. Where conventional geotechnical testing like standard penetration test (SPT) or cone penetration test (CPT) requires a far greater cost and manpower to be used for such purposes, geophysical testing like ground-penetrating radar (GPR) and multichannel analysis of surface waves (MASW) may provide the researchers with more viable options to achieve conclusive evidence on bedrock depth. Application of geophysical techniques has become more and more extensive and advanced in many geo-morphological studies since the early 2000s. Geophysical techniques require less time and effort, and the easy processing of the obtained data is the primary reason for their popularity. However, due to variability in subsoil mechanical properties, wave attenuation and dispersion and diverse geological boundary conditions, the results obtained through geophysical techniques are often ambiguous and non-unique. The interpretation of the obtained data also requires skill and experience, as the range may vary widely and more often than not consensus is difficult to achieve. In this paper, an endeavor has been made to coalesce the results of two widely used geophysical techniques, namely GPR and MASW to derive more conclusive evidence for the detection of bedrock depth in a part of Garhwal Himalayas. The study area comprises of two different cities of Uttarakhand, India. Both the sites possess different geo-morphological attributes and thus prove to be a perfect platform to conduct the experimentations. Both GPR and MASW testing have been performed and results are shown in graphical format. A comparison of the GPR survey with a conventional geotechnical testing (SPT) is also presented here. This study shows that GPR and MASW can provide complementary results in estimating bedrock depth.

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“…1a, b below. The tectonic setup of the study area has been studied quite extensively and is easily available (Joshi and Mohan 2010;Patil et al 2014).…”

Section: Study Areamentioning

confidence: 99%

Estimation of bedrock depth for a part of Garhwal Himalayas using two different geophysical techniques

et al. 2018

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“…The semi empirical modeling technique gives a chance to model a finite rupture plane for simulation of strong ground motion. This technique has been used by Joshi and Patel [17], Joshi and Mohan [19] for preparing of seismic hazard map. The technique of preparation of seismic hazard map given by Joshi and Patel [17] and Joshi and Mohan [19] lacks representation of probability associated with the observed peak ground acceleration at a different location.…”

Section: Preparation Of Seismic Hazard Map Using Semi Empiricalmentioning

confidence: 99%

“…Joshi and Patel [17] have formulated a method of seismic zonation, which is based on the deterministic modeling of finite ruptures along identified probable fault in an area using semi empirical approach. This method of seismic zonation based on semi empirical modeling of rupture plane has been used for preparing seismic hazard map of Doon valley [17], Assam valley [18], and the Uttarakhand Himalaya, India [19]. The technique of hazard zonation is based on the semi empirical simulation technique which in turn is dependent on the attenuation relation applicable in the region under study.…”

Section: Introductionmentioning

confidence: 99%

“…The technique of hazard zonation is based on the semi empirical simulation technique which in turn is dependent on the attenuation relation applicable in the region under study. In preparation of seismic zonation maps for the Uttarakhand Himalaya by Joshi and Mohan [19] the attenuation relation given by Abrahamson and Litehiser [20] has been used. Although the relation by Abrahamson and Litehiser [20] is based on worldwide data, it does not use any data from Himalayan earthquakes and clearly shows deviation from normality when this relation is used to predict Himalayan data [21].…”

Section: Introductionmentioning

confidence: 99%

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Seismic Hazard of the Uttarakhand Himalaya, India, from Deterministic Modeling of Possible Rupture Planes in the Area

Joshi

Kumar

Castaños

et al. 2013

International Journal of Geophysics

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This paper presents use of semiempirical method for seismic hazard zonation. The seismotectonically important region of Uttarakhand Himalaya has been considered in this work. Ruptures along the lineaments in the area identified from tectonic map are modeled deterministically using semi empirical approach given by Midorikawa (1993). This approach makes use of attenuation relation of peak ground acceleration for simulating strong ground motion at any site. Strong motion data collected over a span of three years in this region have been used to develop attenuation relation of peak ground acceleration of limited magnitude and distance applicability. The developed attenuation relation is used in the semi empirical method to predict peak ground acceleration from the modeled rupture planes in the area. A set of values of peak ground acceleration from possible ruptures in the area at the point of investigation is further used to compute probability of exceedance of peak ground acceleration of values 100 and 200 gals. The prepared map shows that regions like Tehri, Chamoli, Almora, Srinagar, Devprayag, Bageshwar, and Pauri fall in a zone of 10% probability of exceedence of peak ground acceleration of value 200 gals.

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“…The PGA values obtained for Western Himalaya varied between 0.15g and 0.3g, which is much lower than those given in earthquake code BIS 1893BIS -2002, and also in the present study. Joshi and Mohan's (2009) method of estimating hazard involved the modeling of rupture planes along identified lineaments in Uttarakhand. As the Southward dipping North Almora Thrust was considered in its entirety, and not segmented, it gave PGA values much higher than anywhere else, of the order of 0.55g, and that too South and West of MFT, i.e.…”

Section: Dpm 205mentioning

confidence: 99%

Assessment of seismic hazard in Uttarakhand Himalaya

Kumar

Sinvhal

2011

Disaster Prevention and Management: An International Journal

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Purpose -For a state like Uttarakhand, which is located in the seismically active Himalayan region and in the vicinity of plate boundaries, estimation of seismic hazards and the preparation of a zoning map are an urgent necessity. This paper aims to focus on this hazard. Design/methodology/approach -In total, 32 potential seismo-tectonic source zones were identified in a very wide area in and around the state, on the basis of seismicity and tectonics, and the longer ones were segmented. The maximum magnitude that each seismo-tectonic source zone can support was then estimated. The seismic hazard due to each seismo-tectonic source zone was assessed at 180 sites, in terms of peak ground acceleration (PGA). Findings -The maximum PGA at each site varied between 0.06g and 0.50g. The seismic hazard was highest around the main central thrust and the main boundary thrust, and five other thrusts between these two thrusts. This assessment was adapted to make a seismic zoning map of Uttarakhand, with five distinct zones. Research limitations/implications -If seismo-tectonic source zones from the contiguous regions of Nepal and Tibet were included as part of this assessment, then a higher hazard would be expected in Uttarakhand. Practical implications -Threat perceptions of a potential earthquake disaster can be assessed in this zoning map. Disaster mitigation strategies will vary geographically, with priorities defined by the zoning map presented here. The methodology evolved has the potential to be extended to other vulnerable states in the Himalayan arc. Originality/value -The seismic hazard assessed has been adapted to formulate a seismic zoning map of Uttarakhand.

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Expected peak ground acceleration in Uttarakhand Himalaya, India region from a deterministic hazard model

Cited by 16 publications

References 23 publications

Estimation of bedrock depth for a part of Garhwal Himalayas using two different geophysical techniques

Estimation of bedrock depth for a part of Garhwal Himalayas using two different geophysical techniques

Seismic Hazard of the Uttarakhand Himalaya, India, from Deterministic Modeling of Possible Rupture Planes in the Area

Assessment of seismic hazard in Uttarakhand Himalaya

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