Jökull


Jökull - 01.06.2000, Qupperneq 45

Jökull - 01.06.2000, Qupperneq 45
Comparison of tomographic crustal models with gravity data Figure 8. Bouguer anomaly fields upward continued to a plane 1 km a.s.l. and adjusted to a mean of 0 mGal. The contour intervals are 0.5 mGal. (a) The observed field, and (b) the simulated field. - Mœlt (a) og reiknað (b) Bouguer þyngdarsvið á Kröflusvœði á plani einum kílómetra ofan sjávarmáls. When compared with the LET model, this patt- ern of density variations shows some similarity, within the resolution of the LET, to the velocity anomalies determined at sea level (Figure 4a). The LET determ- ined velocities at 2 km intervals laterally (3 km along the eastern edge of the study area) and thus spatial discrepancies of up to 1 km between the centres of velocity anomalies (Figure 4a) and density anomalies (Figure 10) may be attributed to coarse resolution in the LET model. Velocities up to ~ 1 km/s higher than the average are imaged around the caldera and bene- ath Leirhnjúkur, in the neighbourhood of areas wh- ere high densities are required by the gravity field. The gradient of the velocity-density relationship used (Equation 1) is 230 kg/m3 per km/s and thus a velocity anomaly of 1 km/s would correspond to a density anomaly of 230 kg/m3, in approximate agreement with the gravity inversion results. ln(E) 11n DD° z 0.7 km □ cut off 1.5km □ b □ □ D Wavenumber 6 (Km'1) Figure 9. Graph of the natural logarithm of the power spectrum vs. wave number for the upward continu- ed, observed gravity field. - Línurit sem sýnir náttúr- lega logrann af aflrófi fyrir mismunandi bylgjulengdir þyngdarsviðsins. JÖKULL No. 48 43
Qupperneq 1
Qupperneq 2
Qupperneq 3
Qupperneq 4
Qupperneq 5
Qupperneq 6
Qupperneq 7
Qupperneq 8
Qupperneq 9
Qupperneq 10
Qupperneq 11
Qupperneq 12
Qupperneq 13
Qupperneq 14
Qupperneq 15
Qupperneq 16
Qupperneq 17
Qupperneq 18
Qupperneq 19
Qupperneq 20
Qupperneq 21
Qupperneq 22
Qupperneq 23
Qupperneq 24
Qupperneq 25
Qupperneq 26
Qupperneq 27
Qupperneq 28
Qupperneq 29
Qupperneq 30
Qupperneq 31
Qupperneq 32
Qupperneq 33
Qupperneq 34
Qupperneq 35
Qupperneq 36
Qupperneq 37
Qupperneq 38
Qupperneq 39
Qupperneq 40
Qupperneq 41
Qupperneq 42
Qupperneq 43
Qupperneq 44
Qupperneq 45
Qupperneq 46
Qupperneq 47
Qupperneq 48
Qupperneq 49
Qupperneq 50
Qupperneq 51
Qupperneq 52
Qupperneq 53
Qupperneq 54
Qupperneq 55
Qupperneq 56
Qupperneq 57
Qupperneq 58
Qupperneq 59
Qupperneq 60
Qupperneq 61
Qupperneq 62
Qupperneq 63
Qupperneq 64
Qupperneq 65
Qupperneq 66
Qupperneq 67
Qupperneq 68
Qupperneq 69
Qupperneq 70
Qupperneq 71
Qupperneq 72
Qupperneq 73
Qupperneq 74
Qupperneq 75
Qupperneq 76
Qupperneq 77
Qupperneq 78
Qupperneq 79
Qupperneq 80
Qupperneq 81
Qupperneq 82
Qupperneq 83
Qupperneq 84
Qupperneq 85
Qupperneq 86
Qupperneq 87
Qupperneq 88
Qupperneq 89
Qupperneq 90
Qupperneq 91
Qupperneq 92

x

Jökull

Direct Links

Hvis du vil linke til denne avis/magasin, skal du bruge disse links:

Link til denne avis/magasin: Jökull
https://timarit.is/publication/1155

Link til dette eksemplar:

Link til denne side:

Link til denne artikel:

Venligst ikke link direkte til billeder eller PDfs på Timarit.is, da sådanne webadresser kan ændres uden advarsel. Brug venligst de angivne webadresser for at linke til sitet.