JORDSKJELV

NGU Bulletin 427 - 1995

NGU BULLETIN

427

Neotectonics in the Ranafjorden area, northern Norway
Odleiv Olesen, Svein Gjelle, Herbert Henkel, Tor Arne Karlsen, Lars Olsen, Terje Skogseth
Page(s): 5-8
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On the composition, distribution and genesis of continental oxidate sediments
Bjørn Bølviken, Siv Kjeldsen, Rolf Tore Ottesen
Page(s): 9-11
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Quaternary palaeosols in Norway - examples from selected areas
Lars Olsen
Page(s): 12-15
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Bavtajohka Interglacial, the oldest Pleistocene vegetational record from Norway
Lars Olsen, Synøve F. Selvik
Page(s): 16-18
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Deglaciation of the Trondheimsfjord area, Central Norway
Arne J. Reite
Page(s): 19-21
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Large continental rotations during Vendian and Palaeozoic times: a simple geodynamic explanation
Trond Helge Torsvik
Page(s): 22-24
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Stratigraphy of the Otta-Vågå tract and regional stratigraphic implications
Brian A. Sturt, Reidulv Bøe, Donald M. Ramsay, Terje Bjerkgård
Page(s): 25-28
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Regional foliation patterns in gneisses as an aid to the correlation of metasupracrustal units in the Western Gneiss Region, southern Norway
Einar Tveten
Page(s): 29-32
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Geology of the West Troms Basement Complex, northern Norway, with emphasis on the Senja Shear Belt: a preliminary account.
Klaas Bouke Zwaan
Page(s): 33-36
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Pb-isotope constraints on the metallogeny in the Meråker Nappe.
Anne Birkeland
Page(s): 37-40
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N2-CO2-CH4-H2O metamorphic fluids in microdiamondbearing lithologies from the Western Gneiss Region in Norway
Rune B. Larsen, Ernst Burke, Larissa F. Dobrzhinetskaya, Elizabeth A. Eide, Brian A. Sturt
Page(s): 41-43
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Isotopic composition, deposition ages and environemnts of Central Norwegian Caledonian marbles
Reidar G. Trønnes, Bjørn Sundvoll
Page(s): 44-47
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Caledonian granitoids in the Frøya-Froan area, central Norway.
Øystein Nordgulen, Arne Solli, Bjørn Sundvoll
Page(s): 48-51
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Neoproterozoic sedimentation on the Rybachi and Sredni Peninsulas and Kildin Island, NW Kola, Russia
Anna Siedlecka
Page(s): 52-55
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Carbonate sand deposition along the coast of southern Norway
Dag Ottesen, Reidulv Bøe, Kari Grøsfjeld
Page(s): 56-59
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Deglaciation of the outermost Trondheimsfjord area, mid-Norway
Dag Ottesen, Bjørn Frengstad, Kåre Rokoengen
Page(s): 60-63
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Aspects of the geology of the southwestern Barents Sea from aeromagnetic data
Jan Reidar Skilbrei
Page(s): 64-67
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Structural setting of two Mesozoic half-grabens off the coast of Trøndelag, Mid-Norwegian shelf
Terje Thorsnes
Page(s): 68-71
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Monitoring of a tracer experiment with electrical resistivity at Haslemoen, Hedmark county, Norway
Marian Morris, Jan Steinar Rønning, Ole Bernt Lile, Nils Otto Kitterød
Page(s): 72-74
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The distribution of radioactive fall-out Nord-Trøndelag from detailed airborne and ground-gamma ray spectrometer surveying
Mark A. Smethurst, Eldar Gaare, Conall MacNiocaill, Peter Walker, Patrice de Caritat
Page(s): 75-78
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The Norwegian groundwater monitoring network (LGN): alkalinity trends in selected aquifers from southern Norway during 1980-1990
Patrice de Caritat, Lars A. Kirkhusmo
Page(s): 79-82
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Hydrogeological investigation of water for export from Nordland county, Norway
Arve Misund, David Banks, Patrice de Caritat
Page(s): 83-85
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A groundwater vulnerability assessment of the Korgen waterworks, Lillehammer
David Segar
Page(s): 86-88
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Combined use of common depth point and common offset techniques in shallow reflection seismics
Eirik Mauring, Jan Steinar Rønning
Page(s): 89-91
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Evaluation of geophysical methods for the delineation of bedrock fractures - a case history from Utengen, Hvaler, southeastern Norway
Jan Steinar Rønning, Torleif Lauritsen, Eirik Mauring
Page(s): 92-95
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Statistical methods in geochemical analysis: an important tool for evaluation and quality control of analytical methods and results
Andreas M. Grimstvedt
Page(s): 96-99
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The significance of analytical procedure in geochemical and environmental studies
Magne Ødegård
Page(s): 100-103
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Expanded use of superficial deposit information in local government with geographical information systems
Per Ryghaug
Page(s): 104-107
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The sequential development of magmatic and ore-forming processes in the Fundsjø Group, Meråker district, Central Norway
Tor Grenne, Jan Hertogen, Arne Solli, Anne Birkeland, Eyolf Erichsen, Jan Sverre Sandstad
Side(r): 108-111
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Rutile associated with eclogites in western Norway and scapolitised gabbros in southern Norway
Are Korneliussen
Page(s): 112-115
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Magmatic and detrial pyrrhotite and pentlandite and magmatic troilite from Nordfjellmark, Velfjord-Tosen region, Central Norwegian Caledonides
Lars Petter Nilsson, Brian A. Sturt
Page(s): 116-118
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Crushed rocks, minerals and mine tailings as sources of potassium in agriculture
Håvard Gautneb, Anne Kjersti Bakken
Page(s): 119-122
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A regional study of the dimension-stone potential in labradorite- bearing anorthositic rocks in the Rogaland Igneous Complex
Tom Heldal, Bjørn Lund
Page(s): 123-126
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Publikasjonstype

RAPPORT

Utgivelsesår

1995

Sedimentological descriptions and results of analytical tests of sediment cores from fjords and lakes in northwest Western Norway

NGU-RAPPORT

2002.014

Publikasjonstype

Utgivelsesår

2002

ISSN

0800-3416

Summary

This cooperative project, involving NGU. Norsk Hydro ASA, the University ofBergen and Sogn og Fjordane College, aims at documenting past slide/masasmovement events recorded in Holocene fjord and lake sediments in western Norwaybetween Sognefjorden and Kristiansund. The assessment og triggering mechanismsof past mass movements is of critical importance for evaluating future risks oncoastal infrastructure and offshore installations.In this report (Phase c) we present the results of laboratory tests and visualdescriptions performed on 43 fjord cores and 26 lake cores that have beencollected in the frame of the current project. Most of the core have beenprofiled using the X-ray inspection system (XRI) and the multi sensor corelogger (MSCL). 55 cores were opend and sedimentologically described.Determinations of geotechnical parameters and sediment physical properties werecarried out on 27 and 26 fjord cores, respectively. Grain-size distibution hasbeen analysed in 35 samples from 3 fjord cores. Radiocarbon dating offoraminifers and shells in fjord cores and bulk gyttja and shells in lake coreswas carried out using both accelerator mass spectrometry (AMS) and conventionalradioactive counting methods. The dating samples were typically collectedbeneath or close to relatively coarse grained sediment intervals that canpossibly be linked to mass movement events. 51 samples from 25 cores have beendated and calendar year ages before present (BP) are reported in the next andon figures.

Forfattere

Lepland, Aivo

Bøe, Reidulv

Sønstegaard, Eivind

Haflidason, Haflidi

Hovland, Connie

Olsen, Heidi

Sandnes, Runar

Kommune

VOLDA

ØRSTA

STAD

Fylke

VESTLAND

MØRE OG ROMSDAL

Tilgjengelig

NGU-biblioteket

Postglacial mass movements in western Norway with special emphasis on the 2000-2200 BP and 2800-3200 BP periods - final report

NGU-RAPPORT

2002.020

Publikasjonstype

Utgivelsesår

2002

ISSN

0800-3416

Summary

The Ormen Lange Gas Field was discovered in the Norwegian Sea outside Møre ogRomsdal in 1997. The development of this field, which is located in the area ofthe Storegga Slide, requires safety assessment. NGU and Norsk Hydro ASA, incooperation with the University of Bergen and Sogn og Fjordane College, havecarried out a project with the aim to collect and compile data on slides,avalanches and gravitational faults that may have resulted from largeearthquakes or tsunamis in northwest Western Norway. A major task in thepresent project has been to investigate the spatial extent and interpret theorigin of a postulated mass-movement event ca. 2000 year ago and to evaluateits causes; climatic variations, a tsunami (possibly caused by an earthquakeaffecting the offshore area), an earthquake only affecting parts of westernNorway, or a combination of an earthquake and a tsunami. Several other massmovements, including Storegga Slide tsunami deposits and pre-Storegga Slideslide and debrisflow deposits have been studied, both in fjord and lakesediments.Five of the 16 investigated fjords (Dalsfjorden, Førdefjorden, Syvdsfjorden,Voldafjorden, Ørstadfjorden) provide evidence for a 2000-2200 years BP(calendar years before present, i.e. 1950) event. Previous investigations showno indication of a large shelf-edge slide in the Storegga area, that may havecreated a tsunami at that time, nor are any mass-movement deposits found onland or in the investigated lakes. This suggests that the 2000-2200 BPdebrisflows and turbidites were most likely related to one or more earthquakeson land or close to the coast, and not an offshore megaslide-generated tsunami.Storegga Slide (8200 BP) tsunami deposits are observed in cores over most ofthe investigated area, both in the deep fjords and in lakes. Strikingsimilarity between major slide and debrisflow deposits at the 2000-2200 BP andca. 11 000-11 700 BP stratigraphic levels sugges a common triggeringmechanisms, probably earthquakes with epicenters in the Sunnfjord-Sunnmøreregion. A period of debrisflows, turbidites and snow avalanches around2800-3200 BP was most probably related to climatic irregularities, as alsoobserved from previous studies elsewhere. Most of these deposits are onlyobserved in cores and not in seismic data. Clusters of rock avalanches from thesecond half of the Holocene, in Romsdalen and Tafjorden, may be related toneotectonic activity of the newly discovered Berill fault, possibly around 3000BP. Several other periods of mass-movement activity (turbidity currents,floods, snow avalanches) have been recorded, e.g. 1700-1800 BP and 5300-5600BP. These are only observed in a few basins, and are thus interpreted to berelated to local climatic variations. Clusters of rock avalanche deposits inthe coastal area probably reflect old events, possibly just after thedeglaciation. Many small debrisflows and turbidities in the early Holocene wereprobably related to rapid land uplift and high rates of erosion, at that time.

Forfattere

Bøe, Reidulv

Lepland, Aivo

Blikra, Lars Harald

Longva, Oddvar

Sønstegaard, Eivind

Fylke

MØRE OG ROMSDAL

VESTLAND

Tilgjengelig

NGU-biblioteket

Rock avalanches, gravitational bedrock fractures and neontectonic faults onshore northern West Norway: Examples, regional distribution and triggering mechanisms

NGU-RAPPORT

2002.016

Publikasjonstype

Utgivelsesår

2002

ISSN

0800-3416

Summary

The present report aims on graviational slope failures in Møre & Romsdal andSogn & Fjordane counties. It presents selected examples and an overview of theregional occurrence of rock avalanches and other bedrock failures. The datadiscussed here have been collected through several NGU projects since 1995, thepresent one being: "Regional landslide occurrences and possible post-glacialearthquake activity in northwestern Norway" (phase D); a project funded byNorsk Hydro ASA and NGU. Geological studies show that several areas in westernNorway have been affected by a significant number of large rock avalanchesthroughout the postglacial period. The geographic distribution of rockavalanches and gravitational bedrock fractures clearly shows a clustering inspecific zones, with the highest frequency in the inner fjord areas of westernNorway. The highest number of such features are also found in two smaller areasof Møre & Romsdal, in a more coastal position around Oterøya and Syvdsfjorden.A group of gravitational failures also occur in the phyllite areas in Aurland,Sogn og Fjordane.The age of the features is still poorly constrained, but a review of existingdatashed som light on the time-frame. The bedrock fractures and rock avalanchesaround Oterøya probably occurred shortly after the deglaciation. The timeconstraint is weak for the coastal area further southwest, but the data pointto several events of different ages. Several dated events in the inner fjordareas of Møre & Romsdal suggests high rock-avalanche activity during the secondhalf of the Holocene. This can be seen in context with a neotectonic fault(Berill fault) in Innfjorden, west of Romsdalen. The Berill fault is at leastyounger than the Younger Dryas period (11500 cal. BP). Some dates of rockavalanches around 3000 cal. BP in Innfjorden and Tafjorden indicate arelationship with the faulting event. The data from Aurland in Sogn & Fjordanesuggest that the gravitational failures in the phyllite area are related to twostages, one shortly after the deglaciation and a smaller event at about 3000cal. BP.Review of historical earthquakes indicate that the triggering of large rockavalanches and deep-seated bedrock failures requires a minimum earthquakemagnitude of about 6.0-6.5 on the Richter scale. The distinct clustering offeatures in specific zones indicates that large earthquake played a role. Therecently detected neotectonic fault (Berill fault) further help to explain somerock avalanches in the fjords of Møre og Romsdal. The fault is situated in thearea of the highest land-uplift gradient in western Norway, which could be thecause for crustal instability. Earthquakes related to this fault were probablyof the order of M 6.5. The spatial distribution of the clustering in Møfre &Romsdal seems to fit a relationship between aerial extent of landslides andearthquake magnitudes of M 6.5 In conclusion, future work should especiallyaim on further investigations of possible neotectonic faults, in order to get abetter understanding of the palaeoseismic activity.

Forfattere

Blikra, Lars Harald

Braathen, Alvar

Anda, Einar

Stalsberg, Knut

Longva, Oddvar

Fylke

MØRE OG ROMSDAL

VESTLAND

Tilgjengelig

NGU-biblioteket

Hazard evaluation of rock avalanches; The Baraldsnes - Oterøya area

NGU-RAPPORT

2001.108

Publikasjonstype

Utgivelsesår

2002

ISSN

0800-3416

Summary

The report provides an evaluation of the hazard related to Skår/Baraldsnes area in accordance with a contract with Hydro Technology and Projects. Geological and historical data on rock-avalanche events demonstrate that the high-risk areas are concentrated to the inner part of deep fjords of western Norway. The studied locations, Baraldsneset, Oppstadhornet and Hellenakken, are situated outside the high-risk areas. Major avalanches cannot be excluded from this region, but the probability is much lower. There are no indications of larger-scale instability structures on Skårahornet near Baraldsneset, and the probability of large rock avalanches from this near area considered very low and at least lower than a yearly probability of 10-4. Debris flows triggered along Kloppelva at the western slope of Skårahornet can reach the fjord in the western part of the considered area and a hazard zone with an estimated yearly of 10-4 is present. Several areas exhibiting collapsed bedrock characterize the 700-m-high slope towards Oppstadhornet. There, distinct large blocks show instense fracturing and overall down-slope sliding both along the foliation and on cross-fractures. Surface disturbanches at two locations indicate recent movement; these failures are younger than ca. 11500 years. The volume of the entire failure is estimated to be c. 20 mill m3 (scenario 1), including a 2-3 mill m3 large steep easter part (scenario 3) that is characterized by fractures and fissures showing evidence of movements. A potential more limited slide from the upper parts of the collapsed area (scenario 2) may influence a mass of 5-7 mill m3. This part constitutes the unstable top layer modelled by NGI. Estimates of potential run-out distances indicate that a large rock avalanche involving the entire area may go 0,7 - 1,2 km into the fjord (scenario 1), whereas the uppermost top of the slide may reach 0

Forfattere

Blikra, Lars H.

Braathern, Alvar

Skurtveit, Elin

Fylke

MØRE OG ROMSDAL

Tilgjengelig

NGU-biblioteket

3rd Slope Tectonics Conference - Program and abstract book

NGU-RAPPORT

2014.030

Publikasjonstype

Utgivelsesår

2014

ISSN

0800-3416

Summary

The 3rd Slope Tectonic Conference arranged at the Geological Survey of Norway on September 8.-12. 2014, follows the 2nd Slope Tectonic Conference organized at the Geological Survey of Austria in 2011 and the 1st Slope Tectonic conference organized at the University of Lausanne, Switzerland in 2008. It stands in an international tradition and a total of 56 contributions will be given on rock slopes affected by slope tectonic processes from 20 counties including Argentina, Austria, Canada, Chile, China, Czech Republic, France, Iceland, Italy, Japan, Kazakhstan, Mongolia, Morocco, Nepal, Norway, Pakistan, Po-land, Scotland (UK), Slovakia, and Switzerland.

Forfattere

Hermanns, R.L.

Liinamaa-Dehls, A.

Dehls, J.F.

Oppikofer, T.

Tilgjengelig

NGU-biblioteket

Geofaredagen 2016 - Program og sammendrag

NGU-RAPPORT

2016.035

Publikasjonstype

Utgivelsesår

2016

ISSN

0800-3416

Prosjektnr

053510

Summary

Geofaredagen 2016 er en del av prosjektet SAK Geofare, som er finansiert av Norges forskningsråd. Geofaredagen 2016 er et møtested, blant annet for studenter, der det presenteres 20 vitenskaplige foredrag og 17 vitenskaplige postere om ny utvikling innen geofarearbeid og pågående forskning i Norge. Temaene for dagen er flom, jord-og flomskred, snøskred, steinsprang, fjellskred, jordskjelv og klimarelatert geofareforskning. Foredragsholderne er studenter og forskere fra nesten alle de norske universitetene (HSF, NTNU, UN IS, UiB, UiO, UiT), Göteborgs universitet (Sverige), Technical University Munich (Tyskland), forskningsinstitusjoner som Norut og NGI, samt statlige etater som NVE, SVV og NGU.
Deltakerne på Geofaredagen 2016 kommer fra ovennevnte institusjoner, andre statlige institusjoner, forskningsinstitusjoner og konsulentfirmaer, samt lcsrer fra videregående skoler. Foredrag og postere vii presenters arbeid fra hele Norge, inkludert Svalbard. Ett foredrag handler om et prosjekt i Tyskland. Geofaredagen 2016 blir etterfulgt av en todagers ekskursjon til Sunndalen, lnnerdalen, Langfjorden og Romsdalen. Det er mer en 100 registrerte deltakere på Geofaredagen 2016.

Forfattere

Hermanns, Reginald

Blikra, Lars Harald

Panthi, Krishna

Hilger, Paula

Nicolet, Pierrick

Krogh, Kaja

Tilgjengelig

NGU-biblioteket

Prosjekt

Administrasjon Skred

"Shaken not stirred": Mosaic sand - a semi-liquefaction phenomenon originating from strong earthquakes

NGU-RAPPORT

2020.020

Publikasjonstype

Utgivelsesår

2020

ISSN

0800-3416

Prosjektnr

378700

Summary

The formation of mosaic sand, here as exemplified from a 0.23 km2 sand field at the coast of Nordland County in Northern Norway, is thought to be related to earthquake induced shaking, re-mobilization and partial (semi-) liquefaction of water-saturated, stratified fine and medium sand. It is therefore a part of the broad class of sediments with seismically induced deformations, known as seismites. The process associated with the formation of mosaic sand may best be described as 'shaken, not stirred', because the individual parts of stratified sands are apparently not totally removed from their original position. The layers are rather broken, fragmented in pieces or ball-like structures, which are deformed, partly rotated and then settled in a complex mosaic mixture. It may also appear just as a cluster of load casts. The structure developed resembles those of a dense conglomerate, a cluster of pseudo-nodules, or as pudding balls (armored sediment balls) cemented by sand.

Forfattere

Olsen, L.

Høgaas, F.

Fylke

TRØNDELAG

NORDLAND

Tilgjengelig

NGU-biblioteket

Prosjekt

Avsluttende kvartærgeologisk kartlegging i påbegynte områder ("Regional kvartærgeologisk kartlegging i Norge II")