Geodynamics of the Chersky seismic belt

Parfenov, Leonid M.; Козьмин, Б. М.; Grinenko, O. V.; Imaev, V. S.; Имаева, Л. П.

doi:10.1016/0264-3707(88)90010-5

Cited by 26 publications

(27 citation statements)

References 8 publications

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“…Seven mechanisms in the Stanovoy foldbelt and south of it are taken from Parfenov et al (1987) and four mechanisms from Wang and Xu (1986) in the Great Khin- Wang and Xu (1986), P87: Parfenov et al (1987)). …”

Section: Focal Mechanism Datamentioning

confidence: 99%

New constraints on the intraplate stress field of the Amurian plate deduced from light earthquake focal mechanisms

Barth

Wenzel

2010

Tectonophysics

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The Amurian plate plays an important role for the understanding of eastern Asian plate dynamics. Different models of rigid-rotation and relative velocities with respect to adjacent plates have been proposed. As few GPS data and sparse stress observations have been available until today-particularly for the intraplate region-these models have proven hard to confirm or deny. To address this we determine new focal mechanisms for this region and perform a stress inversion for selected parts of the plate in order to provide better constraints on the plate dynamics.Most strong earthquakes occur on active plate margins and for these events focal mechanisms are routinely calculated by moment tensor inversion using teleseismic data on a global scale. Away from the plate margins, earthquake magnitudes are smaller and the efficiency of such automated procedures strongly depends on the number of seismic records available. Using the Frequency Sensitive Moment Tensor Inversion allows us to determine source mechanisms of light events with a smaller number of data. For the Amurian plate interior, we calculate 41 focal mechanisms for crustal earthquakes from 1993 to 2008 (3.9 ≤ M W ≤ 5.4). We combine these data with additional solutions from the literature to perform formal stress inversions for three separate regions. The reliability of the resulting stress orientations is evaluated by bootstrap analysis to show the variability of the principle stress axes.For all regions the resulting stress field shows a dominant strike-slip regime with an ENE-WSW orientation of the maximum horizontal compressional stress S H and is consistent with borehole stress data from the World Stress Map at the margins and in the central part of the Amurian plate. Moreover, our analysis reveals differences in both the stress ratio and the S H orientation within the plate interior. While the northern part of the Amurian plate might be influenced by the Baikal rift in terms of a small anti-clockwise rotation of S H , the eastern part of the plate clearly responds to the far field plate-boundary forces from the subducting Pacific plate.

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Section: Focal Mechanism Datamentioning

confidence: 99%

New constraints on the intraplate stress field of the Amurian plate deduced from light earthquake focal mechanisms

Barth

Wenzel

2010

Tectonophysics

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“…From the Laptev Sea, some workers (e.g., Chapman and Solomon, 1976;DeMets, 1992;Steblov et al, 2003) favor extending the North America-Eurasia boundary south across northeast Russia to join with the seismicity of Sakhalin Island, then on to northern Japan, attaching the Okhotsk region to the North American plate. Others (e.g., Zonenshayn et al, 1978;Savostin and Karasik, 1981;Cook et al, 1986;Parfenov et al, 1988;Fujita et al, 1990aFujita et al, , 1997Riegel et al, 1993;Seno et al, 1996) prefer to have the North America boundary follow the band of earthquakes along the Chersky Range to northern Kamchatka and suggest that the Sea of Okhotsk, Kamchatka, northern Japan, eastern Sakhalin, and the area around Magadan comprise a separate Okhotsk microplate or block. The present-day geodynamics of northeast Asia is controlled by the interactions of the Eurasian, North American, and Pacific plates (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…The present-day geodynamics of northeast Asia is controlled by the interactions of the Eurasian, North American, and Pacific plates (Fig. 1 inset; Cook et al, 1986;Parfenov et al, 1988;Fujita et al, 1990aFujita et al, , 1997, and possibly the presumed far-field effects of the Indian plate (e.g., Peltzer and Tapponnier, 1988;Worrall et al, 1996). The movement of these giant plates with respect to each other has resulted in the development of diffuse seismic zones between them and the apparent formation of at least three independent blocks or microplates (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…2; Tarr, 1970;Savostin and Karasik, 1981;Cook et al, 1986;Parfenov et al, 1988;Imaev et al, 1990;Fujita et al, 1990a). In the Arctic Ocean, the seismicity forms a narrow band of primarily normal faulting earthquakes along the Arctic (Gakkel) Mid-Ocean Ridge (Savostin and Karasik, 1981;Cook et al, 1986;Jemsek et al, 1986;Fujita et al, 1990a;Avetisov, 1996), which represents the locus of sea-floor spreading (e.g., Wilson, 1963;Vogt et al, 1979;Cochran et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

“…1 north of about 58 • N) between the North American and Eurasian plates, within a broad zone of seismic activity known as the Chersky Seismic Belt (CSB, Fig. 2; Parfenov et al, 1988).…”

Section: Introductionmentioning

confidence: 99%

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Seismotectonics of the Chersky Seismic Belt, eastern Sakha Republic (Yakutia) and Magadan District, Russia

Fujita

Козьмин

Mackey

et al. 2009

Stephan Mueller Spec. Publ. Ser.

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Abstract. The Chersky seismic belt represents a zone of deformation between the North American and Eurasian plates in northeast Russia. The belt extends from the Laptev Sea into the Chersky Range where it splits into two branches. One branch extends to Kamchatka and the Aleutian-Kurile Junction, while the other branch extends south towards Sakhalin Island. Focal mechanisms indicate a change from extension to transpression in the northern Verkhoyansk Range and generally left-lateral transpression in the Chersky Range extending to northern Kamchatka. The few focal mechanisms on the second branch suggest rightlateral transpression. A large number of faults, sub-parallel to the seismicity and presumed to be strike-slip, are visible in satellite imagery and topographic maps and are also associated with seismically generated landslides.These data support a model in which the Sea of Okhotsk forms the core of a separate Okhotsk microplate surrounded by diffuse boundaries on the north and west. Microseismicity in continental northeast Russia is most heavily concentrated within and between the fault systems along the northern boundary of the proposed Okhotsk plate and indicates a high level of deformation. The sense of slip on the faults (both from focal mechanisms and geology) are also generally consistent with the extrusion of the Okhotsk plate to the southeast as it is compressed between its larger neighbors. The northernmost part of the Okhotsk plate may be decoupled to some degree from the more stable central Sea of Okhotsk.

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Extension across the Laptev Sea continental rifts constrained by gravity modeling

et al. 2015

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The Laptev Shelf is the area where the Gakkel Ridge, an active oceanic spreading axis, approaches a continental edge, causing a specific structural style dominated by extensive rift structures. From the latest Cretaceous to the Pliocene, extension exerted on the Laptev Shelf created there several deep subsided rifts and high-standing basement blocks. To understand syn-rift basin geometries and sediment supply relationships across the Laptev Shelf, accurate extension estimates are essential. Therefore, we used 2-D gravity modeling and 3-D gravity inversion to constrain the amount of crustal stretching across the North America-Eurasia plate boundary in the Laptev Shelf. The latest Cretaceous-Cenozoic extension in that area is partitioned among two rift zones, the Laptev Rift System and the New Siberian Rift. These rifts were both overprinted on the Eurasian margin that had been stretched by 190-250 km before the Late Cretaceous. While the Laptev Rift System, connected to the Gakkel Ridge, reveals increasing extension toward the shelf edge (190-380 km), the New Siberian Rift is characterized by approximately uniform stretching along strike (110-125 km). The architecture of the Laptev Rift System shows that the finite extension of about 500 km is sufficient to entirely eliminate crystalline continental crust. In the most stretched rift segment, continental mantle is exhumed at the base of the Late Mesozoic basement. The example of the Laptev Rift System shows that extension driven by divergent plate movement is a sufficient cause to produce almost complete continental breakup without an increased heat input from the asthenospheric mantle.

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Geodynamics of the Chersky seismic belt

Cited by 26 publications

References 8 publications

New constraints on the intraplate stress field of the Amurian plate deduced from light earthquake focal mechanisms

New constraints on the intraplate stress field of the Amurian plate deduced from light earthquake focal mechanisms

Seismotectonics of the Chersky Seismic Belt, eastern Sakha Republic (Yakutia) and Magadan District, Russia

Extension across the Laptev Sea continental rifts constrained by gravity modeling

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