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![First thumbnail for: Combined Large‐ N Seismic Arrays and DAS Fiber Opt...]()
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![The location of the study area (a); Schematic tectonic map of the Hengill triple junction (Foulger and Toomey, 1989) (b). a: 1, Neovolcanic zones; 2, Ice caps; 3, Seismic lineation; b: Bold lines indicate the outlines of NNE trending eruption/fissure zones. The four hydrothermal activity centers are outlined by dashed lines. Fumaroles are indicated by dots. The line connecting the Hengill and Grensdalur volcanoes indicates the axis of the transverse tectonic structure; volcanism migrated along this axis.]()
![Overview map of the seismic network installations across the Hengill geothermal field. (a,b) Zoom into the location of vibrotruck sweeps along the main road in Mosfellsheiði and around the Nesjavellir power plant, respectively. (c) The permanent (OR, VI) and temporary (2C, YM nodal) seismic networks in Hengill and the location of the telecommunication optical fiber in the north. The red triangle shows the location of the NJ‐11 well. (d) The location of the Hengill area at the triple junction. (e) Zoom into the southern nodal array in Hverahlíð and locations of some of the fields most powerful boreholes. The main roads are shown as thin black lines. The color version of this figure is available only in the electronic edition.]()
![Reykjanes Peninsula oblique rift. West of the Hengill volcanic center (red dashed outline), Holocene lava shields and fissure eruptions (gray) occur in a right-stepping en echelon pattern cut by conjugate northeast and east–northeast-striking faults and northeast-trending fissures and crater rows. Arrows show spreading direction. Younger north–south (NS), dextral strike-slip faults related to the South Iceland seismic zone cut all units. After Sæmundsson et al. (2016) and Hjartardóttir et al. (2016). [Color online.]]()
![Sublatitudinal temperature cross section in the Hengill geothermal area (Spichak and Zakharova, personal communication 2011).]()
![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 is redrawn from Spichak et al. (2011b).]()
![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. The small box inside the bottom inset map indicates the Hengill triple junction, and black solid arrows are the spreading directions.]()
![Geological map of the Hengill volcanic system (adapted from Saemundsson and Einarsson 1980, with changes). Numbers indicate areas, lava flows, and other regional formations referred to in the text.]()
![Tectonic map of the Thingvellir area within the Hengill volcanic system. Numbers indicate areas and faults referred to in the text.]()
![Tectonic map of the Nesjavellir area within the Hengill volcanic system. Numbers indicate locations referred to in the text.]()
![Figure 2. A: MgO (wt%) variation in lavas relative to reference line. Five samples with >10% olivine and >18 wt% MgO are represented by symbols at 16 wt% MgO, but maintain their spatial distribution. B: Cr (ppm) variation in lavas relative to reference line, log scale on Y axis. Lavas 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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![First thumbnail for: Magmatic and tectonic history of Iceland's western...]()
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![First thumbnail for: Axial magma reservoirs located by variation in lav...]()
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![Magnitude–hypocentral distance–location distributions and magnitude–focal depth–location distributions of records used in this study. Only the records up to rhyp=20 km are plotted because there are few records beyond this distance range, with the exceptions of Basel and Hengill.]()
![COntrol SEISmicity and Manage Induced earthQuakes seismic monitoring network in the Hengill region in Iceland. The blue triangles and black circles mark locations of the seismic stations and the geothermal power plants, respectively. The yellow square shows the migration area used in the MALMI workflow. The color version of this figure is available only in the electronic edition.]()
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Journal Article
Combined Large‐ N Seismic Arrays and DAS Fiber Optic Cables across the Hengill Geothermal Field, Iceland Available to Purchase
Journal: Seismological Research Letters
Publisher: Seismological Society of America
Published: 13 July 2022
Seismological Research Letters (2022) 93 (5): 2498–2514.
... Jousset; Stefan Wiemer Abstract From June to August 2021, we deployed a dense seismic nodal network across the Hengill geothermal area in southwest Iceland to image and characterize faults and high‐temperature zones at high resolution. The nodal network comprised 498 geophone nodes spread across...
FIGURES
Journal Article
Observations and Analyses of Shear‐Wave Splitting in the Geothermal Field at Hengill, Iceland Available to Purchase
Journal: Seismological Research Letters
Publisher: Seismological Society of America
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
Journal Article
An Application of Relative Moment Tensor Inversion to Aftershocks of the June 1998 Hengill Earthquake in Southwest Iceland Available to Purchase
Publisher: Seismological Society of America
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...
FIGURES
Journal Article
Non-double-couple earthquakes at the Hengill-Grensdalur volcanic complex, Iceland: Are they artifacts of crustal heterogeneity? Available to Purchase
Publisher: Seismological Society of America
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...
Image
The location of the study area ( a ); Schematic tectonic map of the Hengill... Available to Purchase
in Application of the Electromagnetic Geothermometer in Geothermics and Geothermal Exploration
> Russian Geology and Geophysics
Published: 01 September 2022
Fig. 5. The location of the study area ( a ); Schematic tectonic map of the Hengill triple junction ( Foulger and Toomey, 1989 ) ( b ). a : 1 , Neovolcanic zones; 2 , Ice caps; 3 , Seismic lineation; b : Bold lines indicate the outlines of NNE trending eruption/fissure zones. The four
Image
Overview map of the seismic network installations across the Hengill geothe... Available to Purchase
in Combined Large‐ N Seismic Arrays and DAS Fiber Optic Cables across the Hengill Geothermal Field, Iceland
> Seismological Research Letters
Published: 13 July 2022
Figure 1. Overview map of the seismic network installations across the Hengill geothermal field. (a,b) Zoom into the location of vibrotruck sweeps along the main road in Mosfellsheiði and around the Nesjavellir power plant, respectively. (c) The permanent (OR, VI) and temporary (2C, YM nodal
Image
![Reykjanes Peninsula oblique rift. West of the Hengill volcanic center (red dashed outline), Holocene lava shields and fissure eruptions (gray) occur in a right-stepping en echelon pattern cut by conjugate northeast and east–northeast-striking faults and northeast-trending fissures and crater rows. Arrows show spreading direction. Younger north–south (NS), dextral strike-slip faults related to the South Iceland seismic zone cut all units. After Sæmundsson et al. (2016) and Hjartardóttir et al. (2016). [Color online.]](https://gsw.silverchair-cdn.com/gsw/Content_public/Journal/cjes/56/12/10.1139_cjes-2018-0260/1/s_cjes-2018-0260f4.jpeg?Expires=2147483647&Signature=MZGyUgIP6vVd8lwn-Ie1g2FzmlUyxui9I5-hSIZqN-IyC2kA8EUOS8ki7JXPYq5FC4CR0Df0c3r2hye2S1V7WrgxibNh2KVGlV8iz~LDTgwtp~qGv5usLgPaetS7~5Wi~VF4U-0X~kkyteoJscpQSOOB826ItSnbyLY-auId44ACY-suGCnicVSp5IYzAj3uXfvC4uHYCTGGVSGFP5~-5ewZsfOFLsfp047rQ0G~w8J60FOTpOZLxwtbWVnuJffrK~buXPOzCyLpUYmAm2si62~WTmf9~u0AyFcuymRUl3wN3oYPMf7ZiMXy3RrBsUkTHO2LM1RxwH9zuOPkQZM~eQ__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
Reykjanes Peninsula oblique rift. West of the Hengill volcanic center (red ... Available to Purchase
in Evolution of migrating transform faults in anisotropic oceanic crust: examples from Iceland
> Canadian Journal of Earth Sciences
Published: 15 February 2019
Fig. 4. Reykjanes Peninsula oblique rift. West of the Hengill volcanic center (red dashed outline), Holocene lava shields and fissure eruptions (gray) occur in a right-stepping en echelon pattern cut by conjugate northeast and east–northeast-striking faults and northeast-trending fissures
Image
Sublatitudinal temperature cross section in the Hengill geothermal area (Sp... Available to Purchase
in The subsurface temperature assessment by means of an indirect electromagnetic geothermometer
> Geophysics
Published: 11 July 2012
Figure 14. Sublatitudinal temperature cross section in the Hengill geothermal area (Spichak and Zakharova, personal communication 2011).
Image
Location of the EM sites and boreholes in the Hengill geothermal area. Circ... Available to Purchase
in The subsurface temperature assessment by means of an indirect electromagnetic geothermometer
> 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
Image
Map showing the Hengill volcanic area. Triangles represent the stations in ... Available to Purchase
in An Application of Relative Moment Tensor Inversion to Aftershocks of the June 1998 Hengill Earthquake in Southwest Iceland
> Bulletin of the Seismological Society of America
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
Image
Geological map of the Hengill volcanic system (adapted from Saemundsson and... Available to Purchase
Published: 01 July 2006
Figure 2. Geological map of the Hengill volcanic system (adapted from Saemundsson and Einarsson 1980 , with changes). Numbers indicate areas, lava flows, and other regional formations referred to in the text.
Image
Tectonic map of the Thingvellir area within the Hengill volcanic system. Nu... Available to Purchase
Published: 01 July 2006
Figure 3. Tectonic map of the Thingvellir area within the Hengill volcanic system. Numbers indicate areas and faults referred to in the text.
Image
Tectonic map of the Nesjavellir area within the Hengill volcanic system. Nu... Available to Purchase
Published: 01 July 2006
Figure 4. Tectonic map of the Nesjavellir area within the Hengill volcanic system. Numbers indicate locations referred to in the text.
Image
Figure 2. A: MgO (wt%) variation in lavas relative to reference line. Five ... Available to Purchase
in Axial magma reservoirs located by variation in lava chemistry along Iceland's mid-ocean ridge
> 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.
Journal Article
Application of the Electromagnetic Geothermometer in Geothermics and Geothermal Exploration Available to Purchase
Journal: Russian Geology and Geophysics
Publisher: Novosibirsk State University
Published: 01 September 2022
Russ. Geol. Geophys. (2022) 63 (9): 1078–1092.
...Fig. 5. The location of the study area ( a ); Schematic tectonic map of the Hengill triple junction ( Foulger and Toomey, 1989 ) ( b ). a : 1 , Neovolcanic zones; 2 , Ice caps; 3 , Seismic lineation; b : Bold lines indicate the outlines of NNE trending eruption/fissure zones. The four...
FIGURES
Journal Article
Magmatic and tectonic history of Iceland's western rift zone at Lake Thingvallavatn Available to Purchase
Journal: GSA Bulletin
Publisher: Geological Society of America
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...
FIGURES
Journal Article
Axial magma reservoirs located by variation in lava chemistry along Iceland's mid-ocean ridge Available to Purchase
Journal: Geology
Publisher: Geological Society of America
Published: 01 August 2000
Geology (2000) 28 (8): 699–702.
... 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. ...
FIGURES
Journal Article
Earthquake mechanisms from linear-programming inversion of seismic-wave amplitude ratios Available to Purchase
Publisher: Seismological Society of America
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...
Image
Magnitude–hypocentral distance–location distributions and magnitude–focal d... Available to Purchase
in Predicting Ground Motion from Induced Earthquakes in Geothermal Areas
> Bulletin of the Seismological Society of America
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.
Image
COntrol SEISmicity and Manage Induced earthQuakes seismic monitoring networ... Available to Purchase
in MALMI: An Automated Earthquake Detection and Location Workflow Based on Machine Learning and Waveform Migration
> Seismological Research Letters
Published: 11 May 2022
Figure 2. COntrol SEISmicity and Manage Induced earthQuakes seismic monitoring network in the Hengill region in Iceland. The blue triangles and black circles mark locations of the seismic stations and the geothermal power plants, respectively. The yellow square shows the migration area used
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