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1

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Submarine fault scarps in the Sea of Marmara pull-apart (North Anatolian Fault): Implications for seismic hazard in Istanbul (2005)

R. Armijo ; N. Pondard ; B. Meyer ; [weitere]

In: Geochem. Geophys. Geosyst., Amsterdam, Elsevier Scientific Publishing Company, vol. 6, no. 6, pp. 1-29, pp. Q06009

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Publikationsdatum: 2005

Beschreibung: Earthquake scarps associated with recent historical events have been found on the floor of the Sea of Marmara, along the North Anatolian Fault (NAF). The MAuto-Regressive Moving Average-processRASCARPS cruise using an unmanned submersible (ROV) provides direct observations to study the fine-scale morphology and geology of those scarps, their distribution, and geometry. The observations are consistent with the diversity of fault mechanisms and the fault segmentation within the north Marmara extensional step-over, between the strike-slip Ganos and Izmit faults. Smaller strike-slip segments and pull-apart basins alternate within the main step-over, commonly combining strike-slip and extension. Rapid sedimentation rates of 1-3 mm/yr appear to compete with normal faulting components of up to 6 mm/yr at the pull-apart margins. In spite of the fast sedimentation rates the submarine scarps are preserved and accumulate relief. Sets of youthful earthquake scarps extend offshore from the Ganos and Izmit faults on land into the Sea of Marmara. Our observations suggest that they correspond to the submarine ruptures of the 1999 Izmit (Mw 7.4) and the 1912 Ganos (Ms 7.4) earthquakes. While the 1999 rupture ends at the immediate eastern entrance of the extensional Cinarcik Basin, the 1912 rupture appears to have crossed the Ganos restraining bend into the Sea of Marmara floor for 60 km with a right-lateral slip of 5 m, ending in the Central Basin step-over. From the Gulf of Saros to Marmara the total 1912 rupture length is probably about 140 km, not 50 km as previously thought. The direct observations of submarine scarps in Marmara are critical to defining barriers that have arrested past earthquakes as well as defining a possible segmentation of the contemporary state of loading. Incorporating the submarine scarp evidence modifies substantially our understanding of the current state of loading along the NAF next to Istanbul. Coulomb stress modeling shows a zone of maximum loading with at least 4-5 m of slip deficit encompassing the strike-slip segment 70 km long between the Cinarcik and Central Basins. That segment alone would be capable of generating a large-magnitude earthquake (Mw 7.2). Other segments in Marmara appear less loaded. FROTH

Schlagwort(e): Earthquake hazard ; Turkey ; Fault zone ; NAF ; G3 ; G-cubed ; AGU ; Ucarkus ; Lepinay ; Cagatay ; Cakir ; Structural geology ; 7230 ; Seismology: ; Seismicity ; and ; tectonics ; Oezalaybey ; Ozalaybey ; Lefevre ; 7223 ; Earthquake ; interaction, ; forecasting, ; and ; prediction ; morphology ; submersible ; 8110 ; Tectonophysics: ; Continental ; tectonics: ; general ; 1766 ; 1894 ; 1912 ; 1999 ; Earthquake

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Überblick

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Introduction: Seismogenesis in the eastern United States (1988)

W.-P. Chen ; L. Seeber

In: Seism. Res. Letters, Taipei, Conseil de l'Europe, vol. 59, no. 3, pp. 115-116, pp. B09401, (ISBN: 0-12-018847-3)

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Publikationsdatum: 1988

Schlagwort(e): Seismicity ; Geol. aspects ; Tectonics ; SRL

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3

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On the modified Mercalli intensities and magnitudes of the 1811-12 New Madrid earthquakes (2000)

S. E. Hough ; J. G. Armbuster ; L. Seeber ; [weitere]

In: J. Geophys. Res., Berlin, Ges. f. Geowissenschaften e.V., vol. 105, no. 839-23, pp. 864, pp. 1482, (ISSN 0343-5164)

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Publikationsdatum: 2000

Schlagwort(e): Intensity ; Magnitude ; historical ; Seismicity ; Earthquake ; intra-plate ; USA ; JGR

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Cross-fault triggering in the November 1987 Superstition Hills earthquakes sequence, southern California (1989)

K. W. Hudnut ; L. Seeber ; J. Pacheco

In: Geophys. Res. Lett., Taipei, Am. Inst. Min. Metal. Petr. Eng., vol. 16, no. 3/4, pp. 199-202, pp. 2324, (ISSN 0343-5164)

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Publikationsdatum: 1989

Schlagwort(e): Earthquake ; Geol. aspects ; Stress ; Earthquake precursor: prediction research ; GRL

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5

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The 1886 Charleston, South Carolina earthquake and the Appalachian detachment (1981)

L. Seeber ; J. G. Armbruster

In: J. Geophys. Res., Luxembourg, Conseil de l'Europe, vol. 86, no. 1-4, pp. 7874-7894, pp. 1006, (ISSN: 1340-4202)

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Publikationsdatum: 1981

Schlagwort(e): Earthquake ; Seismology ; Geol. aspects ; Tectonics ; JGR

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6

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Some elements of continental subduction along the Himalayan front (1984)

L. Seeber ; J. G. Armbruster

In: Tectonophys., Luxembourg, Conseil de l'Europe, vol. 105, no. 1-4, pp. 263-278, pp. 1006, (ISSN: 1340-4202)

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Publikationsdatum: 1984

Schlagwort(e): Subduction zone ; China ; Seismicity

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7

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The 1886-1889 aftershocks of the Charleston, South Carolina earthquake: A widespread burst of seismicity (1987)

L. Seeber ; J. G. Armbruster

In: J. Geophys. Res., Luxembourg, Conseil de l'Europe, vol. 92, no. 1-4, pp. 2663-2696, pp. 1006, (ISSN: 1340-4202)

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Publikationsdatum: 1987

Schlagwort(e): Earthquake ; Seismicity ; Aftershocks ; JGR

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8

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NCEER-91, A new catalog for U. S. earthquakes east of New Madrid: Improved intensity-based magnitudes and recurrence relations (1991)

L. Seeber ; J. G. Armbruster

In: NCEER Bulletin, Luxembourg, Conseil de l'Europe, vol. 5, no. 1-4, pp. 1-9, pp. 1006, (ISSN: 1340-4202)

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Publikationsdatum: 1991

Schlagwort(e): Seismicity ; Seismology ; Magnitude ; Earthquake catalog

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9

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Surface rupture and damage patterns in the Ms-2dSus0 = 6.4, September 29, 1993 Killari (Latur) earthquake in central India (1993)

L. Seeber ; S. K. Jain ; C. V. R. Murty ; [weitere]

In: NCEER Bull., Luxembourg, Conseil de l'Europe, vol. 7, no. 4, pp. 12, pp. 1006, (ISSN: 1340-4202)

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Publikationsdatum: 1993

Schlagwort(e): Earthquake ; Seismology ; Geol. aspects ; Intensity

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10

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The San Andreas Fault system through the Transverse Ranges as illuminated by earthquakes (1995)

L. Seeber ; J. G. Armbruster

In: J. Geophys. Res., Luxembourg, Conseil de l'Europe, vol. 100, no. 4, pp. 8285-8310, pp. 1006, (ISSN: 1340-4202)

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Publikationsdatum: 1995

Schlagwort(e): Fault zone ; Seismicity ; JGR

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