Detailed S-wave structure in the Dublin Basin and its northern margin |
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| Authors: | N P Murphy A W B Jacob |
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| Institution: | Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 2, Ireland |
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| Abstract: | Summary. The seismic structure has been measured to a depth of about 3 km along a 30 km seismic profile in east central Ireland. This profile is unusual in that it is the S -wave velocity—depth structure that has been measured to a degree of precision more normally associated with P -wave results. One reason for this is that the sources used were quarry blasts which generated strong S -waves and short-period surface waves but rather weak P -waves.
The results show a layer of Carboniferous limestone with shear velocity 2.65 km?1 s overlying a layer with a velocity of 3.06 km s?1. This second layer was interpreted as Lower Palaeozoic strata (Silurian/Ordovician) since this velocity was evident in an inlier seen at the surface at the northern end of the line. A third refraction horizon, shear velocity 3.45 km s?1 and displaying a basinal structure, was also recognized. This may be Cambrian or Precambrian basement. |
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| Keywords: | seismic structure S-waves |
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