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Indian Region (indian + region)

Distribution by Scientific Domains
Earth and Environmental Science71%
Engineering28%

Selected Abstracts

A deterministic seismic hazard map of India and adjacent areas

GEOPHYSICAL JOURNAL INTERNATIONAL, Issue 2 2003
Imtiyaz A. Parvez
SUMMARY A seismic hazard map of the territory of India and adjacent areas has been prepared using a deterministic approach based on the computation of synthetic seismograms complete with all main phases. The input data set consists of structural models, seismogenic zones, focal mechanisms and earthquake catalogues. There are few probabilistic hazard maps available for the Indian subcontinent, however, this is the first study aimed at producing a deterministic seismic hazard map for the Indian region using realistic strong ground motion modelling with the knowledge of the physical process of earthquake generation, the level of seismicity and wave propagation in anelastic media. Synthetic seismograms at a frequency of 1 Hz have been generated at a regular grid of 0.2°× 0.2° by the modal summation technique. The seismic hazard, expressed in terms of maximum displacement (Dmax), maximum velocity (Vmax), and design ground acceleration (DGA), has been extracted from the synthetic signals and mapped on a regular grid over the studied territory. The estimated values of the peak ground acceleration are compared with the observed data available for the Himalayan region and are found to be in agreement. Many parts of the Himalayan region have DGA values exceeding 0.6 g. The epicentral areas of the great Assam earthquakes of 1897 and 1950 in northeast India represent the maximum hazard with DGA values reaching 1.2,1.3 g. The peak velocity and displacement in the same region is estimated as 120,177 cm s,1 and 60,90 cm, respectively. [source]

Large-scale summer monsoon rainfall over India and its relation to 850 hPa wind shear

HYDROLOGICAL PROCESSES, Issue 15 2007
V. S. Prasad
Abstract The daily variations of the horizontal wind shear at the 850 hPa level between a southern region (5,15°N, 40,80°E; Zone 1) and a northern region (20,30°N, 70,90°E; Zone 2) during the period 1979,2002 were investigated. Investigations revealed that the changes of this wind shear on a daily basis are directly related to the large-scale rainfall over the Indian region during the monsoon season. The wind shear of zonal wind together with Zone 2 is useful for determining active, weak and break periods of the Indian summer monsoon (ISM). Thus, the Horizontal Wind Shear can be used as a dynamical circulation Index (HWSI) for studying ISM variability. Copyright © 2007 John Wiley & Sons, Ltd. [source]

Indoor/outdoor relationships of carbon monoxide and oxides of nitrogen in domestic homes with roadside, urban and rural locations in a central Indian region

INDOOR AIR, Issue 2 2005
A. J. Lawrence
First page of article [source]

Point and areal PMP estimates for durations of two and three days in India

METEOROLOGICAL APPLICATIONS, Issue 1 2000
P R Rakhecha
The risk of dam failure in India, coupled with better analysis of extreme storm events, has led to the estimation of revised one-day probable maximum precipitation (PMP). For some water conservation projects where the catchment area is very large, there is a need to have estimates of PMP for durations of both two and three days. These are provided in this paper. It was found that the two-day PMP over the Indian region varied from 100 cm over the central peninsula to over 290 cm in eastern India. For a duration of three days the corresponding values are 120 cm and 370 cm. For water management projects which include impounding reservoirs, an estimate has been made of the probable maximum flood (PMF) based on the new PMP estimates. The results of the design flood estimates were compared with existing estimates at the same sites and in most cases were found to be considerably higher. A comparison of the revised estimates of PMF and recorded floods in India shows that the trend of the rates of runoff in relation to catchment area differ by an average of 38% for an area of 1000 km2 and 46% for an area of 10 000 km2. These results show that some dams in India may be unsafe in the event of the probable maximum flood. Copyright © 2000 Royal Meteorological Society [source]

Development of a high resolution daily gridded temperature data set (1969,2005) for the Indian region

ATMOSPHERIC SCIENCE LETTERS, Issue 4 2009
A. K. Srivastava
Abstract A high resolution daily gridded temperature data set for the Indian region was developed using temperature data of 395 quality controlled stations for the period 1969,2005. A modified version of the Shepard's angular distance weighting algorithm was used for interpolating the station temperature data into 1° latitude × 1° longitude grids. Using the cross validation, errors were estimated and found less than 0.5 °C. The data set was also compared with another high resolution data set and found comparable. Mean frequency of cold and heat waves, temperature anomalies associated with the monsoon breaks have been presented. Copyright © 2009 Royal Meteorological Society [source]

Black carbon aerosol mass concentration variation in urban and rural environments of India,a case study

ATMOSPHERIC SCIENCE LETTERS, Issue 1 2009
K. V. S. Badarinath
Abstract The present study provides an account of the black carbon (BC) aerosol mass concentration variation in contrasting environments of India corresponding to the urban and rural areas of Hyderabad and Anantapur during August 2006. The study period corresponds to the monsoon season over the Indian region. The diurnal variation of BC showed two peaks, during morning and late evening, which are mostly, related to the diurnal changes in the local boundary layer and traffic density patterns. BC mass concentrations over Hyderabad are estimated to be 92% higher compared to those at the Anantapur site suggesting considerable contrast in its spatial variations. Copyright © 2009 Royal Meteorological Society [source]