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- W2032978248 abstract "In regional seismic surveys use of small semipermanent networks of detectors is often made. This study aims at investigating qualitatively the location capability of networks constituted by four (bare minimum) sensors, arranged in different triangular configurations, which may be deployed in a region of known crustal structure. Their relative performances are evaluated on the basis of overall shifts in hypocentre, epicentre and origin time, these being computed by relocating a large number of assumed sources at three representative depths (0, 5 and 10 km) using an iterative method. Eight constructed examples, of which five pertain to sources lying outside a network and three pertain to sources contained within the outer boundaries of a network, provide data for the study. The influence of shape and size of a given network, on hypocentral determination, relative to the overall dimensions of the expected source region has been discussed. It is shown that a right-angled triangle (three stations at the vertices and one near the centroid) with its equal orthogonal arms comparable in length with radial distance to epicenters is the best suited configuration for locating sources surrounding the network. Reducing network aperture is found to render the network performance poor. However, if the sources happen to be situated inside the network, the response of one type of network is not appreciably different from that of another but comparatively much better than that of any of the ‘source-outside’ configurations. Nevertheless, a right-angled triangle (three stations at the vertices and one near the centroid) enclosing the sources seems to be a marginally better choice. Notwithstanding network geometry, an increase in the number of detectors brings about a definite improvement in the estimates of source parameters. This is demonstrated by taking six stations instead of four. It is also shown that network performance remains practically invariant with shallow source depth. The location errors are inferred to be mainly due to the effect of crustal layering." @default.
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- W2032978248 date "1978-11-01" @default.
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- W2032978248 title "Relative performance of different triangular networks in locating regional seismic sources" @default.
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- W2032978248 doi "https://doi.org/10.1007/bf02861522" @default.
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