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Journal Article
Published: 12 May 2021
Seismological Research Letters (2021) 92 (5): 2838–2849.
...Lars Ottemöller; Won‐Young Kim; Felix Waldhauser; Norunn Tjåland; Winfried Dallmann Abstract An earthquake sequence in the Storfjorden offshore area southwest of Spitsbergen in the Svalbard archipelago initiated with a 21 February 2008 magnitude M w 6.1 event. This area had previously not produced...
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Journal Article
Published: 17 March 2021
Seismological Research Letters (2021) 92 (5): 2695–2704.
...Myrto Pirli; Johannes Schweitzer; Berit Paulsen; Yana V. Konechnaya; Galina N. Antonovskaya Abstract About two decades of earthquake parametric data for the area of Storfjorden offer the best medium‐term image of seismicity yet for the arctic Svalbard Archipelago. Although seismic activity...
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First thumbnail for: Two Decades of Seismicity in <span class="search-h...
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Series: Geological Society, London, Memoirs
Published: 01 January 2016
EISBN: 9781862397088
.... Glacigenic debris-flow deposition is focused at the front of glacial troughs (e.g. Laberg & Vorren 1995 , 1996 ). Description The Storfjorden TMF (Fig. 1 a) shows a seaward-convex depocentre described by Pedrosa et al. (2011) and Lucchi et al. (2013) . The overall bathymetry shows...
Series: Geological Society, London, Memoirs
Published: 01 January 2016
EISBN: 9781862397088
... sediments accumulate on the continental slope during interglacial periods ( Dowdeswell et al. 2002 ). Description Storfjorden TMF consists of three coalescent lobes (I–III) produced by three ice streams (Fig. 1 a, b). It is dominated by an extensive network of gullies on the upper continental slope...
Series: Geological Society, London, Special Publications
Published: 01 January 2011
DOI: 10.1144/SP351.4
EISBN: 9781862395992
... on rockslide susceptibility in the Storfjorden area, a 900 km 2 fjord complex in western Norway that includes the monitored rockslide sites of Åknes and Heggursaksla. We have newly identified 52 potential rockslide sites from aerial photographs. The structural features critical for the development of large...
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Plots of δ18O and δ13C values of benthic and planktic foraminifera records for past 5 ka, representing different water masses from Storfjorden, Storfjorden Trough, and Storfjorden Fan. Average data for past 5 ka for core PS1243 at 2700 m water depth in Greenland Sea (data from Bauch et al., 2001) are also shown. Included are calculated equilibrium (eq.) δ18Ocalcite for Storfjorden brine basin, and for Storfjorden overflow assuming conditions for April 2000 (T = −1.934 °C) and May 2002 (T = −1.539 °C) and δ18Owater of 0.4‰. Abbreviations: GSDW—Greenland Sea Deep Water; GSIW—Greenland Sea Intermediate Water; AsW—Atlantic subsurface water.
Published: 01 October 2009
Figure 3. Plots of δ 18 O and δ 13 C values of benthic and planktic foraminifera records for past 5 ka, representing different water masses from Storfjorden, Storfjorden Trough, and Storfjorden Fan. Average data for past 5 ka for core PS1243 at 2700 m water depth in Greenland Sea (data from
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A: Map of Storfjorden with core locations marked. B: Conductivity, temperature, depth (CTD) profile, Storfjorden Trough, May 2002. C: CTD profile, Storfjorden, April 2000 (data from Skogseth et al., 2004).
Published: 01 October 2009
Figure 1. A: Map of Storfjorden with core locations marked. B: Conductivity, temperature, depth (CTD) profile, Storfjorden Trough, May 2002. C: CTD profile, Storfjorden, April 2000 (data from Skogseth et al., 2004 ).
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Map of relocated seismicity from 2008 to 2020 in Storfjorden together with double‐couple mechanisms obtained through moment tensor inversion as given in Table 1. Epicenters are plotted in color depending on the year of occurrence as given in the legend. The mechanisms near the 2008 the mainshock area are oblique normal, although they are pure strike‐slip faulting mechanisms for events north of the mainshock cluster. Linear features identified from the seismicity distribution are indicated by solid black lines and labeled with letters (A–H). The features A–F are repeated in Figure 5. Red boxes indicate the extent of the areas around features A, B, and H, respectively, from which events are selected for the projections in Figure 6. The directions of orange arrows indicate the trend of the greatest principal stress (σ1) and the least principal stress (σ3), and their length is inversely proportional to the horizontal projection of the plunge angles of the respective stress axes. Thin lines beneath orange arrows indicate the horizontal for plunge = 0°. The location of the 1976 Heerland earthquake is given by a black star. Dashed lines indicate the assumed southward continuation of two fault zones on either side of Storfjorden, Lomfjorden fault zone (LFZ) and SFZ, with unknown positions and fault patterns.
Published: 12 May 2021
Figure 4. Map of relocated seismicity from 2008 to 2020 in Storfjorden together with double‐couple mechanisms obtained through moment tensor inversion as given in Table  1 . Epicenters are plotted in color depending on the year of occurrence as given in the legend. The mechanisms near the 2008
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Event cumulative count for the Heerland and Storfjorden 2008–2012 source regions, as defined in Figure 3f, as well as the entire Storfjorden area south of 77.5° N.
Published: 17 March 2021
Figure 5. Event cumulative count for the Heerland and Storfjorden 2008–2012 source regions, as defined in Figure  3f , as well as the entire Storfjorden area south of 77.5° N.
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Seismicity, focal mechanisms, and main tectonic structures in Storfjorden. Epicenters are noted as dots and double‐couple solutions as focal mechanism plots, numbered by order of event occurrence (Table S2, available in the supplemental material to this article): 1 = 21.02.2008 02:46; 2 = 29.02.2008 08:16; 3 = 10.04.2008 06:20; 4 = 13.01.2010 10:08; 5 = 13.03.2010 08:07; 6 = 12.04.2010 07:57; 7 = 15.09.2010 05:56; 8 = 22.09.2010 06:56; 9 = 16.11.2010 22:00; 10 = 22.01.2011 11:25; 11 = 05.05.2011 11:09; 12 = 03.08.2011 15:32; 13 = 02.10.2011 20:54; 14 = 27.07.2013 16:22; 15 = 11.01.2016 21:02; 16 = 29.03.2016 10:32; 17 = 16.07.2017 04:49; 18 = 31.12.2017 15:50. The focal mechanism of the 18 January 1976, mb 5.5 event in Heerland (Bungum and Kristoffersen, 1982) is also shown. To enhance visibility in the 2008–2012 source region, solutions most similar to that of the mainshock are shown in place; the others are moved. Main ruptures and similar geometries in Storfjorden, as well as the rupture at Heerland, are marked with dashed, gray lines, arrows noting sense of motion. Fault traces are marked with black lines, solid lines where mapped, dashed lines where assumed. Billefjorden fault zone (BFZ) mapped after Norsk Polarinstitutt (2015), Lomfjorden fault zone (LFZ) mapped after Piepjohn et al. (2019), and Storfjorden fault zone (SFZ) as in Pirli et al. (2013; references therein); Ter is the inferred Tertiary structure in Bergh and Grogan (2003), sense of motion based on the offset of the BFZ (not included in this map frame).
Published: 17 March 2021
Figure 6. Seismicity, focal mechanisms, and main tectonic structures in Storfjorden. Epicenters are noted as dots and double‐couple solutions as focal mechanism plots, numbered by order of event occurrence (Table S2, available in the supplemental material to this article): 1 = 21.02.2008 02:46; 2
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▴ Geometry of the two airgun-shot profiles conducted in Storfjorden on 12 August 2008 (left). The first and last, as well as every fifth shot of each line, are shown. Bandpass-filtered records (4.0–10.0 Hz) of the 29 airgun shots at six vertical elements of the SPITS array and the vertical channel of HSPBB and KBS (right). Top trace is the SPITS array beam of the six traces below.
Published: 01 January 2010
Figure 2. ▴ Geometry of the two airgun-shot profiles conducted in Storfjorden on 12 August 2008 (left). The first and last, as well as every fifth shot of each line, are shown. Bandpass-filtered records (4.0–10.0 Hz) of the 29 airgun shots at six vertical elements of the SPITS array
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▴ Map of Storfjorden (left) presenting the spatial distribution of the 150 relocated aftershocks (filled circles), the corresponding locations according to NORSAR's Regional Reviewed Bulletin (open circles), the epicenter of the mainshock (star), and the double-couple solutions determined by moment tensor inversion in this study. All aftershocks are scaled according to magnitude, the largest plotted event being characterized by a magnitude value of M 4.7. The three-dimensional spatial distribution (right) of the 2008 Storfjorden earthquake sequence, as obtained in this study. In the upper plot, the viewpoint lies in the south, while in the lower plot it is in the west, in both cases set 3° above sea level. The hypocenter of the main event is noted with a blue cube. The depth scale is exaggerated (∼2x) to facilitate an easier observation of the geometry of the distribution.
Published: 01 January 2010
Figure 9. ▴ Map of Storfjorden (left) presenting the spatial distribution of the 150 relocated aftershocks (filled circles), the corresponding locations according to NORSAR's Regional Reviewed Bulletin (open circles), the epicenter of the mainshock (star), and the double-couple solutions
Journal Article
Journal: GSA Bulletin
Published: 01 July 1999
GSA Bulletin (1999) 111 (7): 1080–1097.
...Julian A. Dowdeswell; Martin J. Siegert Abstract Long-range side-scan sonar images of the Barents Sea continental margin have been analyzed in conjunction with results from previous geophysical investigations to determine a qualitative model for sedimentation over the Bear Island and Storfjorden...
Journal Article
Journal: Geology
Published: 01 October 2009
Geology (2009) 37 (10): 903–906.
...Figure 3. Plots of δ 18 O and δ 13 C values of benthic and planktic foraminifera records for past 5 ka, representing different water masses from Storfjorden, Storfjorden Trough, and Storfjorden Fan. Average data for past 5 ka for core PS1243 at 2700 m water depth in Greenland Sea (data from...
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First thumbnail for: Stable isotope signals from brines in the Barents ...
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Bathymetric map of Barents Sea continental margin. Locations of three-dimensional seismic survey (southern box), Figures 2A–2C and 3D (multibeam bathymetry), Ocean Drilling Program (ODP) Site 986, and well 7216/11–1S (black dot) are indicated. B—Bear Island Trough, BITMF—Bear Island Trough Mouth Fan, STMF—Storfjorden Trough Mouth Fan, INBIS—INBIS (interfan Bear Island–Storfjorden Trough Mouth Fans) channel.
Published: 01 February 2010
Trough Mouth Fan, STMF—Storfjorden Trough Mouth Fan, INBIS—INBIS (interfan Bear Island–Storfjorden Trough Mouth Fans) channel.
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Figure 1. Overview color shaded-relief map of the Norwegian margin, including Svalbard and the Barents Sea. (A) 57°–69°N. (B) 69°–81°N. S—Skagerrak; MP—Måløy Plateau;F—Frøyabanken;SU—Suladjupet; H—Haltenbanken; SK—Sklinnadjupet; SR—Skjoldryggen; TB—Trænabanken; T—Trænadjupet; V—Vestfjorden; RB—Røstbanken; L—Lofoten Islands; TF—Tromsøflaket; BIT—Bear Island Trough; BIF—Bear Island Fan; B—Bear Island; SF—Storfjorden Fan; ST—Storfjorden Trough; NAL—Nordaustlandet.
Published: 01 July 2005
—Røstbanken; L—Lofoten Islands; TF—Tromsøflaket; BIT—Bear Island Trough; BIF—Bear Island Fan; B—Bear Island; SF—Storfjorden Fan; ST—Storfjorden Trough; NAL—Nordaustlandet.
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Figure 1. (cont.) Overview color shaded-relief map of the Norwegian margin, including Svalbard and the Barents Sea. (A) 57°–69°N. (B) 69°–81°N. S—Skagerrak; MP—Måløy Plateau;F—Frøyabanken;SU—Suladjupet; H—Haltenbanken; SK—Sklinnadjupet; SR—Skjoldryggen; TB—Trænabanken; T—Trænadjupet; V—Vestfjorden; RB—Røstbanken; L—Lofoten Islands; TF—Tromsøflaket; BIT—Bear Island Trough; BIF—Bear Island Fan; B—Bear Island; SF—Storfjorden Fan; ST—Storfjorden Trough; NAL—Nordaustlandet.
Published: 01 July 2005
; RB—Røstbanken; L—Lofoten Islands; TF—Tromsøflaket; BIT—Bear Island Trough; BIF—Bear Island Fan; B—Bear Island; SF—Storfjorden Fan; ST—Storfjorden Trough; NAL—Nordaustlandet.
Journal Article
Published: 01 January 2010
Seismological Research Letters (2010) 81 (1): 63–75.
...Figure 2. ▴ Geometry of the two airgun-shot profiles conducted in Storfjorden on 12 August 2008 (left). The first and last, as well as every fifth shot of each line, are shown. Bandpass-filtered records (4.0–10.0 Hz) of the 29 airgun shots at six vertical elements of the SPITS array...
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First thumbnail for: Preliminary Analysis of the 21 February 2008 Svalb...
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(a) Distribution of P axes (squares) and T axes (circles) of the 19 shocks of the Storfjorden earthquake sequence used for stress tensor inversion. Each P and T axis is identified by the event ID number listed in Table 1 and color coded for mechanism types: oblique dip slip (red), normal faulting (blue), and strike slip (black). (b) Orientations of σ1 axes (squares) and σ3 axes (circles) of the 208 acceptable stress models of the stress inversion using the 19 Storfjorden earthquake sequence dataset. The best‐fitting stress model (black symbols) has an average misfit value of 2.6° and corresponding stress ratio, R=0.40. The stress model with 90% confidence limit is plotted with gray‐shaded symbols, and open symbols indicate 99% confidence limit and average misfits of about 4.0° and 4.5°, respectively.
Published: 12 May 2021
Figure 7. (a) Distribution of P axes (squares) and T axes (circles) of the 19 shocks of the Storfjorden earthquake sequence used for stress tensor inversion. Each P and T axis is identified by the event ID number listed in Table  1 and color coded for mechanism types: oblique dip slip (red
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Distribution of magnitude ML and cumulative seismic moment of the Storfjorden earthquake sequence over time. Magnitudes are taken from the NNSN bulletin.
Published: 12 May 2021
Figure 3. Distribution of magnitude M L and cumulative seismic moment of the Storfjorden earthquake sequence over time. Magnitudes are taken from the NNSN bulletin.