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Hengill

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Journal Article
Published: 28 January 2015
Seismological Research Letters (2015) 86 (2A): 424-430.
... is the Hengill volcanic center, which lies on the plate boundary between the North American and the European crustal plates in southwestern Iceland. The rifting of the two plates has opened a north‐northeast‐trending system of normal faults with frequent magma intrusions. The Hengill central volcano and its...
FIGURES | View All (5)
Journal Article
Published: 01 April 2008
Bulletin of the Seismological Society of America (2008) 98 (2): 636-650.
...L. Hagos; H. Shomali; B. Lund; R. Böðvarsson; R. Roberts Abstract Using spectral amplitudes from the South Iceland Lowland ( SIL ) seismic network, we conduct a relative moment tensor inversion ( RMTI ) on aftershocks of the June 1998 M w 5.4 event that occurred at the Hengill triple junction...
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Journal Article
Published: 01 February 1993
Bulletin of the Seismological Society of America (1993) 83 (1): 38-52.
... or thermal contraction due to cooling. Nevertheless, the possible biasing effects of wave propagation in structurally complicated volcanic regions has made the identification of non-DC mechanisms as true source phenomena uncertain. Non-DC earthquakes are common at the Hengill-Grensdalur volcanic complex...
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Location of the EM sites and boreholes in the <b>Hengill</b> geothermal area. Circ...
in > Geophysics
Published: 11 July 2012
Figure 13. Location of the EM sites and boreholes in the Hengill geothermal area. Circles mark MT sites, dots indicate TDEM sites, triangles mark boreholes; H means Mt Hengill, He-Hellisheidi, Ne-Nesjavellir, Hv-Hveragerdi. Upper map is redrawn from Foulger and Toomey, (1989) , lower map
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Sublatitudinal temperature cross section in the <b>Hengill</b> geothermal area (Sp...
in > Geophysics
Published: 11 July 2012
Figure 14. Sublatitudinal temperature cross section in the Hengill geothermal area (Spichak and Zakharova, personal communication 2011).
Image
Map showing the <b>Hengill</b> volcanic area. Triangles represent the stations in ...
Published: 01 April 2008
Figure 1. Map showing the Hengill volcanic area. Triangles represent the stations in the SIL network. Inset map on top shows surface faults trending north-northeast–south-southeast (Saemundsson, personal comm., 2006). Bottom inset map shows the major regional and global tectonic features
Journal Article
Journal: GSA Bulletin
Published: 01 November 2005
GSA Bulletin (2005) 117 (11-12): 1451-1465.
... on time scales of thousands of years. Lake Thingvallavatn is oriented SW-NE, parallel to the trend of normal faults and fissures, which extend northeast from Hengill, a central volcano system. Thingvallavatn's lake sediments provide a continuous high-fidelity record of tectono-magmatic processes. Chirp...
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Journal Article
Published: 01 June 2013
Bulletin of the Seismological Society of America (2013) 103 (3): 1875-1897.
... the evaluation of seismic hazard in the vicinity of geothermal power plants is associated with high uncertainty. Various ground‐motion datasets of induced and natural seismicity (from Basel, Geysers, Hengill, Roswinkel, Soultz, and Voerendaal) were compiled and processed, and moment magnitudes for all events...
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Journal Article
Journal: Geophysics
Published: 11 July 2012
Geophysics (2012) 77 (4): WB179-WB190.
...Figure 13. Location of the EM sites and boreholes in the Hengill geothermal area. Circles mark MT sites, dots indicate TDEM sites, triangles mark boreholes; H means Mt Hengill, He-Hellisheidi, Ne-Nesjavellir, Hv-Hveragerdi. Upper map is redrawn from Foulger and Toomey, (1989) , lower map...
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Journal Article
Journal: Geophysics
Published: 01 December 1999
Geophysics (1999) 64 (6): 1877-1889.
... with that of the Hengill-Grensdalur area in Iceland, a largely unexploited water-dominated field in an extensional stress regime. These differences are poorly understood but may be linked to the contrasting regional stress regimes and the industrial exploitation at The Geysers. GeoRef, Copyright 2005, American...
Journal Article
Published: 01 August 1996
Bulletin of the Seismological Society of America (1996) 86 (4): 972-980.
... on inequality constraint for an amplitude ratio takes the same mathematical form as a polarity observation. Three-component digital data for an earthquake at the Hengill-Grensdalur geothermal area in southwestern Iceland illustrate the power of the method. Polarities of P , SH , and SV waves, unusually well...
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Magnitude–hypocentral distance–location distributions and magnitude–focal d...
Published: 01 June 2013
Figure 1. Magnitude–hypocentral distance–location distributions and magnitude–focal depth–location distributions of records used in this study. Only the records up to r hyp =20  km are plotted because there are few records beyond this distance range, with the exceptions of Basel and Hengill.
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Well logs (solid lines) and estimated temperature profiles (lines with tria...
in > Geophysics
Published: 11 July 2012
of the profiles in Hengill geothermal area. (After Spichak and Zakharova, 2009a , 2009b .)
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Figure 2. A: MgO (wt%) variation in lavas relative to reference line. Five ...
in > Geology
Published: 01 August 2000
with >10% (accumulated) olivine are identified on both plots. Hengill data are from Walker (1992) . Three shaded vertical areas highlight low-MgO and low-Cr clusters, three areas influenced by volcanic centers Reykjanes, Trölladyngja, and Hengill.
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Figure 1. Simplified map of Reykjanes Peninsula showing representative dist...
in > Geology
Published: 01 August 2000
at locality X but erupted from vent at Y would be located on reference line at Z. General locations of Reykjanes, Trölladyngja, and Hengill are indicated.
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Limitation of the first-arrival method. Examples of two focal mechanisms th...
Published: 01 August 2015
Figure 5. Limitation of the first-arrival method. Examples of two focal mechanisms that fit a high-quality data set of first polarity observations from the Hengill geothermal area, Iceland. Lower focal hemispheres are shown in equal area projection. Open and solid circles indicate inward
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Figure 1. Bathymetric map of Thingvallavatn (contours in m). Positions of C...
Published: 01 November 2005
Hengill triple junction; SISZ—South Iceland seismic zone; WRZ—western rift zone; RR—Reykjanes Ridge; NAM—North America plate; EUR—Europe plate. Stipple indicates volcanic zones, and the arrows describe the relative plate motion vector ( DeMets et al., 1994 ).
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Figure 7. Chirp profiles within the central lake run parallel to tectonic s...
Published: 01 November 2005
Figure 7. Chirp profiles within the central lake run parallel to tectonic structure (see Fig. 1 for position). This profile runs from the volcanic ridge, which links Hengill to Nesjaey and Sandey, northward to the east of Sandey into the well-sedimented northern part of the lake. The flank
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Magnitude‐Conversion Formulas Used to Estimate  M  w  for Those Earthquakes...
Published: 01 June 2013
M w = M L −0.3 for M L >4 ( Goertz‐Allmann et al. , 2011 ) 0.175 for M L >4 Geysers M w =0.90 M D +0.47 0.08 Hengill M w =0.546 M w,IMO +1.072 0.28 Roswinkel M w =0.578 M L +1.168 0.10 Soultz M w =0.614 M L +0.433 0.19 Voerendaal M w =0.641 M L
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The southwestern part of Iceland. Dotted lines outline the western volcanic...
Published: 01 August 2011
by small circles. This period of time is selected to show the activity in a relatively calm seismic period in the zone; the exception was Hengill volcano at the western end of the SISZ, where high activity of small earthquakes started in 1994.