Deglacial paleoseismicity in Sweden: the 9663 BP Iggesund event

Mörner, Nils‐Axel; Tröften, Per Einar; Sjöberg, Rabbé; Grant, Douglas; Dawson, Sue; Bronge, Christian; Kvamsdal, Ole; Sidén, Alf

doi:10.1016/s0277-3791(00)00095-0

Cited by 39 publications

(31 citation statements)

References 10 publications

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“…In this search, the focus has primarily been on looking for basement-related faults that are penetrating the overlying late glacial or Holocene sedimentary layers up to or sufficiently close to the surface to enable us to classify them as postglacial faults. The interesting paleoseismic observations reported by Mörner (1996Mörner ( , 2000 for southern Sweden are problematic in this sense since they are not accompanied by similar observations of deep-seated basement-related faults.…”

Section: Deglaciation-related Seismicitymentioning

confidence: 76%

Postglacial seismicity offshore mid-Norway with emphasis on spatio-temporal–magnitudal variations

Bungum

Lindholm

Faleide³

2005

Marine and Petroleum Geology

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Section: Deglaciation-related Seismicitymentioning

confidence: 76%

Postglacial seismicity offshore mid-Norway with emphasis on spatio-temporal–magnitudal variations

Bungum

Lindholm

Faleide³

2005

Marine and Petroleum Geology

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“…Earthquake activity mainly reflects the ongoing collision of the Alpine belt as it has been described by Persaud & Pfiffner (2004) for the eastern Swiss Alps. Potentially, the higher frequency in the oldest paleoseismic record images also the isostatic rebound after the retreat of the glaciers in the Alpine valleys as reported for Northern Europe (Ringrose 1987;Mörner 2000). The clustering during the last 4000 y BP can partly be an effect of the increasing quality of the database but probably reflects a periodic activation of a seismogenic zone in Central Switzerland during more recent times.…”

Section: Discussionmentioning

confidence: 93%

Earthquake-induced deformation structures in lake deposits: A Late Pleistocene to Holocene paleoseismic record for Central Switzerland

Monecke

Anselmetti

Becker³

et al. 2006

Eclogae geol. Helv.

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Paleoseismic record in lake deposits in Central Switzerland 343 ZUSAMMENFASSUNG In den bis zu 15,000 Jahre alten Sedimenten von vier Seen in der Zentralschweiz wurden Spuren von drei starken historischen und mindestens sieben prähistorischen Erdbeben gefunden. Der Schweizer Erdbebenkatalog der letzten 1000 Jahre verzeichnet in der Zentralschweiz drei grössere Erdbeben mit Magnituden zwischen Mw=5.7 und Mw = 6.2 (1964 AD Alpnach, 1774 AD Altdorf, 1601 AD Unterwalden) sowie ein katastrophales Mw = 6.9 Ereignis in Basel im Jahre 1356 AD. Zur Bestimmung der Wiederkehrraten dieser starken Erdbeben wurden mit Hilfe von hochauflösender Seismik und Sedimentkernanalysen paläoseismische Untersuchungen in vier verschiedenen Seen in der Zentralschweiz durchgeführt (Lungerer See, Baldegger See, Seelisberg Seeli und Vierwaldstätter See). In Abhängigkeit von der Geometrie des Seebeckens, des Sedimenttyps und der lokalen Bodenerschütterung treten wäh-rend eines Erdbebens grosse subaquatische Rutschungen oder kleine in-situ Deformationsstrukturen auf. Die Spuren der historischen Erdbeben zeigen, dass Seesedimente nur ab einer Magnitude von Mw>5.7 und bei einer lokalen Bodenerschütterung der Intensität >VII deformiert werden. Mindestens sechs prähistorische Erdbeben in der Zentralschweiz (Epizentrum und Magnitude ähnlich wie beim Mw=6.2 Unterwalden Erdbeben), sowie ein starkes prähisto-risches Erdbeben in der Baselregion (Magnitude ähnlich wie beim Mw = 6.9 Basel Erdbeben) konnten anhand der Art und regionalen Verteilung der Deformationsstrukturen bestimmt werden. Darüber hinaus gibt es Hinweise auf ein weiteres Ereignis in der Nähe von Basel und vier weitere Ereignisse in der Zentralschweiz. Im Vergleich zum Mittleren Holozän scheint die Erdbebenhäufigkeit in der Zentralschweiz erhöht während des Spätpleistozäns/Frühho-lozäns und während der letzten 4000 Jahre. Dies kann einerseits auf isostatische Ausgleichsbewegungen nach dem Abschmelzen des Eises vor 15,000 Jahren, sowie auf eine periodische Aktivierung einer alpinen seismogenen Zone in jüngerer Zeit zurückgeführt werden. ABSTRACTTraces of three larger historic and at least seven prehistoric earthquakes during the last 15,000 years were found in the sedimentary record of four lakes in Central Switzerland. The Swiss historic earthquake catalogue of approximately the last 1000 years reports three larger earthquakes in Central Switzerland with moment magnitudes varying between Mw = 5.7 and Mw = 6.2 (1964 AD Alpnach, 1774 AD Altdorf, 1601 AD Unterwalden) and the nearby catastrophic Mw = 6.9 event close to Basel in 1356 AD. In order to determine the recurrence intervals of such events and thus, the seismic hazard and risk, paleoseismic investigations were carried out in four different lakes of Central Switzerland (Lungerer See, Baldegger See, Seelisberg Seeli, Vierwaldstätter See) using high-resolution seismic data and sediment core analyses. Depending on lake basin geometry, sediment type and local ground shaking earthquake-induced deformation structures comprise large-scale mass...

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“…In association with those earthquakes, tsunami events have also been recorded. Up to now, a total of 17 events (Table 1) have been documented and described (Mörner, 1996(Mörner, , 1998(Mörner, , 2003(Mörner, , 2008b(Mörner, , 2009aMörner et al, 2000). They are traced both in on-shore environment as intra-clay sand-layers containing a planctonic microfossil fauna and flora, and in off-shore environment as extensive turbidites (followed over distances as large as 320 km).…”

Section: Swedenmentioning

confidence: 99%

“…In the Hudiksvall area of central Sweden, there occurred a very large earthquake in the varve-year 9663 BP (Mörner et al, 2000;Mörner, 1998Mörner, , 2003Mörner, , 2008aMörner, , 2011. The paleogeography of this event is very well known ( Fig.…”

Section: The 9663 Bp Paleoseismic Eventmentioning

confidence: 99%

Traces of Tsunami Events in off- and on-Shore Environments. Case Studies in the Maldives Scotland and Sweden

Mörner¹,

Nils-Axel²,

Dawson³

et al. 2011

The Tsunami Threat - Research and Technology

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Deglacial paleoseismicity in Sweden: the 9663 BP Iggesund event

Cited by 39 publications

References 10 publications

Postglacial seismicity offshore mid-Norway with emphasis on spatio-temporal–magnitudal variations

Postglacial seismicity offshore mid-Norway with emphasis on spatio-temporal–magnitudal variations

Earthquake-induced deformation structures in lake deposits: A Late Pleistocene to Holocene paleoseismic record for Central Switzerland

Traces of Tsunami Events in off- and on-Shore Environments. Case Studies in the Maldives Scotland and Sweden

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