Summary of Crustal Thickness Measurements in Iceland

Fig 1: Map of Iceland showing selected crustal thickness measurements. Letters in paranthesis refer to comments below.

Supporting data

• Crustal thickness data
  
  

  latitude	longitude	thickness	Note
  64.37	-21.85	24	a
  63.83	-20.45	20	a
  64.10	-21.15	22	a
  64.90	-16.90	35	b
  64.05	-20.17	30	c
  65.25	-16.25	35	c
  65.05	-14.50	35	d
  65.70	-16.75	19	d
  65.60	-16.15	25	d
  65.88	-17.35	25	d
  65.50	-17.45	25	e
  65.30	-17.25	31	e
  64.30	-19.50	30	f

  
  
  
• Notes
  
  

  note	Reference
  a	Bjarnason et al. [1993]
  b	reinterpretation of Gebrande et al. [1980] (see below)
  c	Menke et al. [1996]
  d	Staples et al. [1997]
  e	B96 results
  f	unpublished record section (see below)

  
  
  
• References
  
  
  1. Bjarnason, I., W. Menke, O. Flovenz and D. Caress, Tomographic image of the spreading center in south Iceland, J. Geophys. Res. 98, 6607-6622, 1993
  2. Gebrande, H., H. Miller and P. Einarsson, Seismic structure of Iceland along the RRISP profile, J. Geophys. 47, 239-249, 1980.
  3. Menke, W., B. Brandsdottir, P. Einarsson and I. Bjarnason, Reinterpretation of the RRISP-77 Iceland shear wave profiles, Geophys. J. Int. 126, 166-172, 1996.
  4. Staples, R., R. White, B. Brandsdottir, W. Menke, P. Maguire and J. McBride, Faroes-Iceland Experiment - 1: The crustal structure of northeastern Iceland, in press in j. Geophys. Res., 1997.
  
  
  
• Note 1. Gebrande et al. (1980) give a record section for a shot D (their figure 1) showing a weak secondary arrival that we, following Bjarnason et al. (1993), interpret as PmP. It has a reduced arrival time of 4.0s at 100 km range, and 3.1 s at 150 km range (reduced to 7.0 km/s). Assuming a SIST-like crustal velocity model, the crustal thickness is about 35 km.
  
  
• Note 2. An unpublished record section of a Bardarbunga earthquake (22 June 1993) observed on the South Iceland Lowland array, with a Pg-Pn crossover distance of 160 km (corresponding to a crustal thickness of about 30 km).
  • Record section (PostScript version).
  • Apparent velocities (PostScript version).

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