Seismic Hazard Assessment of Dhanbad City, India, by deterministic approach
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Seismic Hazard Assessment of Dhanbad City, India, by deterministic approach Rahul Sinha1 · Rajib Sarkar1 Received: 27 July 2019 / Accepted: 8 May 2020 © Springer Nature B.V. 2020
Abstract Dhanbad is the largest producer of coal in the state of Jharkhand, India, and hence, it is one of the most important cities in the country. Considering the present-day importance and future growth of the city, assessment of seismic hazard is extremely needed, especially for the mining authorities and the city planners. The prime objective of this study is to develop seismic hazard map of Dhanbad City for the bedrock level following the deterministic approach. In view of the absence of the region-specific Ground Motion Prediction Equations, the concept of logic tree comprising four different attenuation models is adopted. It is observed that the Peak Ground Acceleration in the range of 0.10–0.26 g may be expected in the city. Specifically, southern blocks of the city such as Baghmara, Jharia and Baliapur are found to be most vulnerable to the seismic hazard. Besides, developed seismic hazard map is divided into four zones and smooth acceleration response spectrums are proposed for the zones as per the expected seismicity in different parts of the city. Keywords Hazard assessment · Seismic microzonation · Deterministic seismic hazard analysis (DSHA) · Site-specific response spectrum · Dhanbad City
1 Introduction Dhanbad is the second most populous city in the state of Jharkhand, India (Census 2011, Government of India). A rapid increase in the population has been witnessed in the last few years. Approximately 12% increase in population was registered in the year 2011 as compared to 2001 census data. Therefore, adequate city planning for Dhanbad City is the need of the hour. The main reason behind the high rate of increase in inhabitants is the abundance of coal in the city. Dhanbad, also known as the Coal Capital of India, is one of the largest producers of coal in the country. As a result, the city has become a hub of many industries. Moreover, due to high demands of coal, existing and new mines are being * Rajib Sarkar [email protected]; [email protected] Rahul Sinha [email protected] 1
Department of Civil Engineering, Indian Institute of Technology (ISM) Dhanbad, Dhanbad 826004, India
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explored for higher production. Hence, seismic stability of the mines and the overburden dumps has also become a major issue. Therefore, planning and execution of the mining activities must be carried out considering the expected seismicity. This highlights the importance of estimation of the seismic hazard for different parts of Dhanbad City. IS 1893-Part 1 (2016) has divided India into four number of zones (viz. Zone II, Zone III, Zone IV and Zone V). The code classifies Dhanbad into Zone III and recommends the PGA value of 0.16 g for the whole city. However, many investigators have suggested that ignoring spatial variability in seismic hazard may be fatal for important and lifelin
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