Tectonophysics and recent geodynamics

Kuzmin, Yu. O.

doi:10.1134/s1069351309110056

Cited by 22 publications

(12 citation statements)

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“…Ярким примером таких блоков, отсутствующих в общепринятой геологиче-ской модели NUVEL-1A [DeMets et al, 1990[DeMets et al, , 1994, являются микроплиты в Северо-Восточной Азии, рас-положенные в регионе взаимодействия трех крупней-ших тектонических плит: Евразийской, Североамери-канской и Тихоокеанской. Именно взаимное переме-щение тектонических блоков различного масштаба и их столкновение на границах являются основной при-чиной возникновения деформационных процессов в литосфере [Le Pichon, 1968;Minster et al, 1974;Kuzmin, 2009]. Скорость перемещения тектонических блоков может варьироваться от долей миллиметров в год для геодинамики стабильных в первом приближе-нии областей до нескольких сантиметров в год для крупномасштабной динамики литосферных плит, что обусловливает различную интенсивность деформаци-онных процессов.…”

Section: Introductionunclassified

Remote triggering of fault-strength changes on the San Andreas fault at Parkfield

Taira

Silver

Niu

et al. 2009

Nature

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Analysis of data from permanent GPS observation stations located in tectonically active regions provides for direct observation of deformation processes of the earth's surface which result from elastic interaction of the lithospheric plates and also occur when accumulated stresses are released by seismic events and postseismic processes.This article describes the methodology of applying the regression analysis of time series of data from GPS-stations for identification of individual components of the stations' displacements caused by the influence of various deformation processes. Modelling of the stations' displacements caused only by deformations of the marginal zone, wherein the lithospheric plates interact, allows us to study variations of the steady-state deformation in the marginal zone.The proposed methodology is applied to studies of variations of fields of cumulative surface displacements, surface displacement velocity and maximum shear strain velocity which are determined from the GPS data recorded prior to the Parkfield earthquake of 28 September 2004 (M w =6.0).Combined analysis of the variations of the above-mentioned fields shows that measurable anomalies of the elastic deformation of the transform fault's edge took place prior to the seismic event of 28 September 2004, and such anomalies were coincident in space and time with the focal area of the future seismic event. Геофизическая служба РАН, Обнинск, РоссияАннотация: Анализ данных постоянных станций GPS-наблюдений в тектонически активных регионах позволяет осуществлять прямое наблюдение процессов деформирования земной поверхности как вследствие упругого взаимо-действия литосферных плит, так и вследствие высвобождения накопленного напряжения в результате сейсмических событий и постсейсмических процессов.Представлена методология использования регрессионного анализа временных рядов станций GPS для выделения

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Section: Introductionunclassified

Remote triggering of fault-strength changes on the San Andreas fault at Parkfield

Taira

Silver

Niu

et al. 2009

Nature

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“…распределение вертикальных смещений на основе 26 квазиортогональных пересечений зоны разлома ниве лирными профилями. Уникальность заключалась в том, что практически одновременно проводились по вторные высокоточные (с погрешностью 1.5-2.0 мм) наблюдения с интервалом порядка 1 года [Kuzmin, 2009].…”

Section: пространственновременная структура современных геодинамическunclassified

“…Подобные низкие скорости относительных горизонтальных де формаций противоречит скоростям монотонного, од нонаправленного движения литосферных плит. Все это позволяет трактовать выявленные несоответствия как «парадокс малых скоростей горизонтальных де формаций» земной поверхности [Kuzmin, 2009].…”

Section: парадоксы скоростей деформаций и механизм формирования совреunclassified

“…Согласно изложенной выше региональной гео динамической схеме, данная линия должна испыты вать систематическое удлинение со среднегодовой скоростью порядка первые сантиметры в год, в соот ветствии с правосторонним сдвигом в зоне Передового разлома Копетдага. Так как этого не происходит, то очевидно, что региональные характеристики напря женнодеформированного состояния остаются практи чески неизменными во времени [Kuzmin, 2009].…”

Section: копетдагская сейсмоактивная зонаunclassified

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Rheology of the mantle and tectonics of the oceanic lithospheric plates

Trubitsyn

2012

Izv., Phys. Solid Earth

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Recent deformation processes taking place in real time are analyzed on the basis of data on fault zones which were collected by longterm detailed geodetic survey studies with application of field methods and satellite monitoring.A new category of recent crustal movements is described and termed as parametrically induced tectonic strain in fault zones. It is shown that in the fault zones located in seismically active and aseismic regions, super intensive displacements of the crust (5 to 7 cm per year, i.e. (5 to 7)•10 -5 per year) occur due to very small external impacts of natural or technogenic / industrial origin.The spatial discreteness of anomalous deformation processes is established along the strike of the regional Rechitsky fault in the Pripyat basin. It is concluded that recent anomalous activity of the fault zones needs to be taken into account in defining regional regularities of geodynamic processes on the basis of realtime measurements.The paper presents results of analyses of data collected by longterm (20 to 50 years) geodetic surveys in highly seismi cally active regions of Kopetdag, Kamchatka and California. It is evidenced by instrumental geodetic measurements of recent vertical and horizontal displacements in fault zones that deformations are 'paradoxically' deviating from the inherited move ments of the past geological periods.In terms of the recent geodynamics, the 'paradoxes' of high and low strain velocities are related to a reliable empirical fact of the presence of extremely high local velocities of deformations in the fault zones (about 10 -5 per year and above), which take place at the background of slow regional deformations which velocities are lower by the order of 2 to 3. Very low average annual velocities of horizontal deformation are recorded in the seismic regions of Kopetdag and Kamchatka and in the San Andreas fault zone; they amount to only 3 to 5 amplitudes of the earth tidal deformations per year.A 'faultblock' dilemma is stated for the recent geodynamics of faults in view of interpretations of monitoring results. The matter is that either a block is an active element generating anomalous recent deformation and a fault is a 'passive' ele ment, or a fault zone itself is a source of anomalous displacements and blocks are passive elements, i.e. host medium. 'Para doxes' of high and low strain velocities are explainable under the concept that the anomalous recent geodynamics is caused by parametric excitation of deformation processes in fault zones in conditions of a quasistatic regime of loading.Based on empirical data, it is revealed that recent deformation processes migrate in fault zones both in space and time. Two types of waves, 'interfault' and 'intrafault', are described. A phenomenological model of autowave deformation proc esses is proposed; the model is consistent with monitoring data. A definition of 'pseudowave' is introduced. Arrangements to establish a system for monitoring deformation autowaves are described.When applied to geological deformation monito...

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“…It should be noted that upon establishment of numerous geodetic polygons with quite dense networks of measuring gauges, it was convincingly concluded that strain waves propagate both along and between faults [Kuzmin, 2009].…”

Section: Introductionmentioning

confidence: 99%

Migration of seismic and volcanic activity as display of wave geodynamic process

Викулин¹,

Викулина²,

Акманова³

et al. 2012

Geodyn. Tectonophys.

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Publications about the earthquake foci migration have been reviewed. An important result of such studies is establishment of wave nature of seismic activity migration that is manifested by two types of rotational waves; such waves are responsible for interaction between earthquakes foci and propagate with different velocities. Waves determining long-range interaction of earthquake foci are classified as Type 1; their limiting velocities range from 1 to 10 cm/s. Waves determining short-range interaction of foreshocks and aftershocks of individual earthquakes are classified as Type 2; their velocities range from 1 to 10 km/s. According to the classification described in [Bykov, 2005], these two types of migration waves correspond to slow and fast tectonic waves. The most complete data on earthquakes (for a period over 4.1 million of years) and volcanic eruptions (for 12 thousand years) of the planet are consolidated in a unified systematic format and analyzed by methods developed by the authors. For the Pacific margin, Alpine-Himalayan belt and the Mid-Atlantic Ridge, which are the three most active zones of the Earth, new patterns of spatial and temporal distribution of seismic and volcanic activity are revealed; they correspond to Type 1 of rotational waves. The wave nature of the migration of seismic and volcanic activity is confirmed. A new approach to solving problems of geodynamics is proposed with application of the data on migration of seismic and volcanic activity, which are consolidated in this study, in combination with data on velocities of movement of tectonic plate boundaries. This approach is based on the concept of integration of seismic, volcanic and tectonic processes that develop in the block geomedium and interact with each other through rotating waves with a symmetric stress tensor. The data obtained in this study give grounds to suggest that a geodynamic value, that is mechanically analogous to an impulse, remains constant in such interactions. It is thus shown that the process of wave migration of geodynamic activity should be described by models with strongly nonlinear equations of motion.Key words: migration, waves, rotation, seismicity, volcanism, geodynamics, conservation law, rheidity. MIGRATION OF SEISMIC AND VOLCANIC ACTIVITY AS DISPLAY OF WAVE GEODYNAMIC PROCESS

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Tectonophysics and recent geodynamics

Cited by 22 publications

References 1 publication

Remote triggering of fault-strength changes on the San Andreas fault at Parkfield

Remote triggering of fault-strength changes on the San Andreas fault at Parkfield

Rheology of the mantle and tectonics of the oceanic lithospheric plates

Migration of seismic and volcanic activity as display of wave geodynamic process

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