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Khandelwal, D. D.
- Strong Motion Data Analysis of the 4 April 2011 Western Nepal Earthquake (M 5.7) and its Implications to the Seismic Hazard in the Central Himalaya
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Authors
Affiliations
1 Wadia Institute of Himalayan Geology, 33 GMS Road, Dehradun 248 001, IN
1 Wadia Institute of Himalayan Geology, 33 GMS Road, Dehradun 248 001, IN
Source
Current Science, Vol 109, No 10 (2015), Pagination: 1822-1830Abstract
In the present study, the strong motion data of the 4 April 2011 western Nepal earthquake (M 5.7) recorded by a dense network of 24 strong motion accelerograph stations have been used to estimate horizontal and vertical component of the peak ground acceleration (PGA) to better understand its bearing on the seismic hazard scenario of the Central Himalayan region. We assimilated attenuation curves using the observed PGA values and found that the zone is associated with higher H/V ratio in which the attenuation trend remains bimodal with one trend for closer distance up to 100-120 km, while the other trend corresponds to distances extending beyond 1000 km. We infer that the two different PGA trends have close bearing on the major tectonics and structural set-up of the region, which is possibly attributed to subsurface structural variation through which the seismic wave travels, suggesting changes of crustal heterogeneities beneath the source zone. The present work may improve the concept of ground motion model for evaluating seismic hazard for the Himalaya.Keywords
Earthquakes, Peak Ground Acceleration, Seismic Hazard, Strong Motion Data.Full Text
References
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- Observations of Rainfall in Garhwal Himalaya, India during 2008-2013 and its Correlation with TRMM Data
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PDF Views:97
Authors
Affiliations
1 Wadia Institute of Himalayan Geology, 33 G.M.S. Road, Dehradun 248 001, IN
1 Wadia Institute of Himalayan Geology, 33 G.M.S. Road, Dehradun 248 001, IN
Source
Current Science, Vol 108, No 6 (2015), Pagination: 1146-1151Abstract
Rainfall variations in the Garhwal Himalaya, Uttarakhand were studied for a period of six years from 2008 to 2013. The rainfall data were obtained through a dense network of rain gauges installed by India Meteorological Department (IMD), New Delhi, are spreaded over seven districts of Uttarakhand, combined with the data from Wadia Institute of Himalayan Geology (WIHG) rain gauge located at Ghuttu, Garhwal Himalaya. The rainfall data of WIHG have a sampling interval of 15 min, while IMD provides district- wise rainfall measurements with monthly temporal resolution. Therefore, extreme events of rainfall which occurred in a short duration of time were observed using the rainfall data of WIHG. Similarly, daily diurnal variations of rainfall were also observed in these data. The seasonal variations and distribution of rainfall in different districts of the Garhwal region were seen in both WIHG and IMD datasets. An increasing trend of rainfall activity was seen from 2008 to 2013. Meterological observations suggest that the isohyet has shifted towards end-September in recent years. Two events of extreme rainfall in the Garhwal Himalaya in 2012 and 2013 caused a major loss of life and property in the region. The rain gauge of WIHG recorded heavy rainfall during both the events. In 2012, ~70 mm rainfall was recorded in 1 h and in 2013 the rain gauge data showed about 250 mm rainfall in 52 h. The daily diurnal records of rainfall show a minimum between 0700 and 1300 h local time (local time = UT + 5.30 h) and diurnal maximum between 2200 and 0300 h local time for all the years. The seasonal variation of rainfall reveals that the peak season of monsoon ranges from June to September in the Garhwal region, which contributes about 50-90% to the annual rainfall. We also compared the observed results of rain gauges with TRMM-derived rainfall data and found a good correlation ranging from 0.6 to 0.9.Keywords
Extreme Rainfall Events, Rain Gauge, Monsoon Season, Seasonal And Diurnal Variations.Full Text