Geoscience Research

28-33

Authors: KASHID DHANAJI LAHU, KASHID NITA DHANAJI

In the present paper the cropping pattern in Sindhudurg district is outlined, followed by the discussion on the area under individual crops. Bhatia’s method is used for concentration of selected crops. In this paper an attempt is made to study the changes in crop concentration in the study region. There has been a significant variation in the area patterns of the crop concentration in the study region. The indices of crop concentration area calculated for two periods i.e. 1981-86 and 1996-2001 and are given in the (table 1.1).The spatial variations in the degree of crop concentration area are found to be the result of the different interaction such as physiographic, climatic, hydrological, socio-economic and technological factors in organizational of an area.

7-21

Authors: Moidaki M., Gao S.S., Liu K.H., Abdelsalam M.G., Hogan J.P., Atekwana E

Receiver functions from numerous teleseismic earthquakes recorded at 26 broadband seismic stations within the New Madrid Seismic Zone (NMSZ) were analyzed to map crustal thickness, Poisson’s ratio and Moho thickness within and around the NMSZ. The results show that the average crustal thickness of the stations within the Mississippi embayment is 33.4±0.28 km. The crust thins to about 25.5±1.09 km at OXF and thickens to about 43.3±0.12 km at PLAL. In the Mazatazal Belt, the crust varies from 30.2±0.14 to 53.1±0.29 km thick. However, the crust is thicker at WCI (53.1±0.29 km). There is a dramatic change in crustal thickness between the cratonic stations and stations within the Mississippi embayment. Our results from the Mazatzal belt are comparable to other Proterozoic and Archean shields that include reasonably well determined Moho depths, mostly based on receiver functions. The average crustal thickness for all shields is 39 km, while the average for Proterozoic shields is 40 km, and the average for Achaean shields is 38 km. We observed a dramatic change in crustal thickness from stations with the Mississippi embayment over a very short distance.