ERE - 2010

Permanent URI for this collectionhttp://192.248.9.226/handle/123/18290

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Browsing ERE - 2010 by Author "Ekneligoda, TC"

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    Modeling simple craters using gravity measurements
    (Department of Earth Resources Engineering, 2010-09) Henkel, H; Ekneligoda, TC; Ratnayake, NP; Abeysinghe, AMKB; Premasiri, HMR; Karunaratne, S
    A study was carried out for two early Paleozoic impact structures in Sweden. These two impact structures (Granby and Tvaren) are located in the southern part of Sweden. Common features can be identified of these two structures as similar diameter of ca 2 km and a substantial post impact fill with Paleozoic sedimentary rocks. The Granby structure represents an almost completely preserved impact crater within a Paleozoic sedimentary rock sequence — only the uppermost part of the raised crater rim might be eroded and was subsequently covered by Quaternary sediments. The Tvaren structure is eroded below the surrounding pre-impact Paleozoic cover rocks into the underlying crystalline basement and has a Quaternary sediment fill. Gravity measurements were carried out on land and sea ice. The inverse gravity modeling shows a gradual change of density and the equivalent porosity with radial distance from the explosion center within the damage zone around and below simple craters.
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    Spatial properties of lineaments using a computer software
    (Department of Earth Resources Engineering, 2010-09) Ekneligoda, TC; Henkel, H; Ratnayake, NP; Abeysinghe, AMKB; Premasiri, HMR; Karunaratne, S
    An interactive software, Spatial Analysis of Lineaments, has been developed, that calculates the spatial properties azimuth, length, spacing, and unidirectional frequency of lineaments, provided that the starting and end coordinates of the lineaments are given. The software accepts a large number of lineaments. The different statistical properties are derived in series of steps and spatial outliers are removed in an interactive way. The software allows the user to sub-divide the azimuth group in to two or more if necessary. The nearest lineament is found based on the rules developed by Ekenligoda, & Henkel, 2004. The results are presented in graphical form for all spatial properties mentioned above together with mean, mode and standard deviation of each property and the number of lineaments involved for the derivation of spatial properties and the unidirectional lineament frequency.