S T G Raghukanth, Bhargavi Podili, K P Sreejaya, I D Gupta, A D Roshan, R Sinha, S Chopra, D Srinagesh, Alpa Sheth, R Goswami, H S Mandal, Ram Jivan Singh, J K Chaudhary, S Arun Kumar, C V R Murty
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引用次数: 0
摘要
本文介绍了作为印度地震标准 IS 1893（第 1 部分）第七次修订的一部分，绘制印度新地震带图所采用的程序。新的地震带图主要基于对全国经纬度 0.1°×0.1° 网格间距进行的地震危险概率分析。但是，对于概率危险估计值较小的网格位置，则根据最近绘制的断层上最可能发生的最大震级，确定性地估计了最低危险水平。根据估算结果，印度陆地被划分为五个区域，分别为 "地震 II 区、III 区、IV 区、V 区和 VI 区"。这些地区重现期为 2475 年的峰值地面加速度估计分别为 0.15、0.30、0.45、0.60 和 0.75g，其中还包括场地放大效应。作为一项临时措施，建议对所有五个区域采用通用的归一化响应谱，三个不同的场地土壤条件各采用一个响应谱。
The paper describes the procedure employed for developing a new earthquake zone map of India as part of the seventh revision of the Indian Earthquake Standard IS 1893 (Part 1). This new zone map is based primarily on a probabilistic earthquake hazard analysis performed at a grid spacing of 0.1°×0.1° in longitudes and latitudes of the entire country. But, for grid locations with small probabilistic hazard estimates, a minimum level of hazard has been estimated deterministically for the most likely maximum magnitude of an earthquake on the nearest mapped fault. Based on the results, the Indian landmass is grouped into five zones, designated as ‘earthquake zones II, III, IV, V, and VI.’ The peak ground accelerations corresponding to a return period of 2475 yr in these zones are estimated as 0.15, 0.30, 0.45, 0.60, and 0.75g, which also include the site amplification effect. Common normalized response spectra are recommended for all five zones, one for each of the three different site soil conditions, as an interim measure.
期刊介绍：
The Journal of Earth System Science, an International Journal, was earlier a part of the Proceedings of the Indian Academy of Sciences – Section A begun in 1934, and later split in 1978 into theme journals. This journal was published as Proceedings – Earth and Planetary Sciences since 1978, and in 2005 was renamed ‘Journal of Earth System Science’.
The journal is highly inter-disciplinary and publishes scholarly research – new data, ideas, and conceptual advances – in Earth System Science. The focus is on the evolution of the Earth as a system: manuscripts describing changes of anthropogenic origin in a limited region are not considered unless they go beyond describing the changes to include an analysis of earth-system processes. The journal''s scope includes the solid earth (geosphere), the atmosphere, the hydrosphere (including cryosphere), and the biosphere; it also addresses related aspects of planetary and space sciences. Contributions pertaining to the Indian sub- continent and the surrounding Indian-Ocean region are particularly welcome. Given that a large number of manuscripts report either observations or model results for a limited domain, manuscripts intended for publication in JESS are expected to fulfill at least one of the following three criteria.
The data should be of relevance and should be of statistically significant size and from a region from where such data are sparse. If the data are from a well-sampled region, the data size should be considerable and advance our knowledge of the region.
A model study is carried out to explain observations reported either in the same manuscript or in the literature.
The analysis, whether of data or with models, is novel and the inferences advance the current knowledge.
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