naa a22 4500 510755135 CHVBK 20180411083119.0 cr unu---uuuuu 180411e20130601xx s 000 0 eng 10.1007/s12594-013-0101-z doi (NATIONALLICENCE)springer-10.1007/s12594-013-0101-z Mundepi A. Wadia Institute of Himalayan Geology, 248 001, Dehradun, India aut Seismic microzonation study in Doon valley, northwest Himalaya, India [Elektronische Daten] [A. Mundepi] Fundamental frequency map of site amplification at different sites in Doon valley, Uttarakhand, India is prepared from microtremor (ground ambient noise) using Horizontal to Vertical Spectral Ratio (HVSR) technique. The fan deposited alluvium filled synclinal valley of Doon lies between Main Boundary Thrust (MFT) and Himalayan Frontal Thrust (HFT) in the Himalayan active seismic belt and experienced many earthquakes in the past. The HVSR at different sites in the Doon valley ranges between the predominant frequencies 0.13 and 12.77 Hz. The HVSR in lower frequencies indicates that the site has either thick sediment covers or less compact rocks with fractures. Based on information on fundamental frequency and soft soil thickness, site classification map is generated. Results indicate that degree of compactness of rock types and presences of sediments vary significantly, which may play a major role in seismic hazard. The use of microtremor, therefore, constitutes an effective and inexpensive approach to site response and soft soil thickness estimation for preliminary microzonation. Geological Society of India, 2013 Microtremor nationallicence HVSR nationallicence Fundamental Frequency nationallicence Seismic microzonation nationallicence Soil thickness nationallicence Journal of the Geological Society of India Springer-Verlag 81/6(2013-06-01), 767-773 0016-7622 81:6<767 2013 81 12594 https://doi.org/10.1007/s12594-013-0101-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12594-013-0101-z text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Mundepi A. Wadia Institute of Himalayan Geology, 248 001, Dehradun, India aut NATIONALLICENCE 773 0- Journal of the Geological Society of India Springer-Verlag 81/6(2013-06-01), 767-773 0016-7622 81:6<767 2013 81 12594 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer