Fróðskaparrit - 01.01.1971, Qupperneq 106

Fróðskaparrit - 01.01.1971, Qupperneq 106
114 Seismic Measurements on The Faeroe Islands, 1970 could be observed. For the other seismograms the correlation of a second event is uncertain. The travekimes of a seismic event were read from the original seismograms and were used together with the distances to calculate the velocities under use of the least-square-met'nod. Table 2 gives the results. Table 2 Vt V2 Profile 1: (km/s) (km/s) shotpoint 9—22 6.1 3.4 shotpoint 35—41 5.6 — shotpoint I, II, III 5.7 — The velocities are apparent velocities, because they are ob- served in only one direction. The second event of Profile 1 (shotpoint 9 to 17) seems to be the shearwave (S) belonging to the first arrival of a compressional wave (P), hereby assuming the ratio of velocities Vp to V8 is equal to j/3. Remarkable is the lower velocity of the first event in the second part of Profile 1 (5.6 km/s) when comparing it with the first part (6.1 km/s). The first arrivals represent a seismic horizon, which has a steeper downdip in the distance about 60 km than in 23 to 42 km. The velocity of 5.7 km/s, found for the shotpoints I, II, III, therefore represents a horizon also with the same downdip. When comparing these results with the velociities given by Pálmason (1965) the 6.1 and 5.6 (5.7) km/s seem to be apparent velocities of the substratum with a real velocity of 6.4 krn/s. The velocities 3.9 and 4.9 km/s of the basalt series of the islands could not be correlated. Also missing are velocities belonging to crustal horizons under the investigated one.
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