Receiver function tomography of the central Tien Shan

Vinnik, Lev; Reigber, Christoph; Aleshin, I. M.; Kosarev, G. L.; Kaban, Mikhail K.; Oreshin, Sergey; Roecker, S. W.

doi:10.1016/j.epsl.2004.05.039

Cited by 166 publications

(165 citation statements)

References 29 publications

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“…For our research we use data from different origins. There are geological data like geologic maps and tectonic maps (DELVAUX et al 2001), geophysical data like a Bouguer anomaly map from surveys in the USSR in the late ´70 (, data from the GRACE satellite mission like EGM 2008 (PAVLIS et al 2008), GPS data (UNAVCO 2008), local seismic catalogues and seismic models from receiver functions (VINNIK et al 2004(VINNIK et al , 2006) and seismic tomography (MAKAROV et al 2005). In this work parts of the seismic hazard assessment are presented.…”

Section: Introductionmentioning

confidence: 99%

Rating of seismicity and reconstruction of the fault geometries in northern Tien Shan within the project “Seismic Hazard Assessment for Almaty”

Torizin

Jentzsch

Malischewsky

et al. 2009

Journal of Geodynamics

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, et al.. Rating of seismicity and reconstruction of the fault geometries in northern Tien Shan within the project "Seismic Hazard Assessment for Almaty". Journal of Geodynamics, Elsevier, 2009, 48 (3-5) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractThe project "Seismic Hazard Assessment for Almaty" has a main objective to improve existing seismic hazard maps for the region of northern Tien Shan and especially for the surroundings of Almaty and to generate a new geodynamic model of the region.In the first step a composite seismic catalogue for the northern Tien Shan region was created, which contains about 20,000 events and is representative for strong earthquakes for the period back to the year 500. For the period of instrumental observation 1911-2006 the catalogue contains data for earthquakes with a body wave magnitude larger than 4. For smaller events with magnitudes up to 2.2 the data are only available since 1980. The composite catalogue was created on the basis of several catalogues from the United States Geologic Survey (USGS), local catalogues from the Kazakh National Data Centre (KNDC) and the USSR earthquake catalogue. Due to the different magnitudes used in several catalogues a magnitude conversion was necessary. Event density maps were created to rate the seismicity in the region and to identify seismic sources. Subsurface fault geometries were constructed using tectonic model which uses fault parallel material flow and is constrained by GPS data. The fault geometry should improve the estimation of the expected seismic sources from seismic density maps. First analysis of the earthquake catalogue and the density maps has shown that nearly all large events are related to fault systems. Annual seismicity distribution maps suggest different processes as the cause for the seismic events. Apart from tectonics, also fluids play a major part in triggering of the earthquakes. Beneath the Issyk-Kul basin the absence of strong seismic activity suggest aseismic sliding at the flat ramp in a ductile crust part and low deformation within the stable Issyk-Kul micro continent which underthrust the northern ranges of Tien Shan. First results suggest a new partition of the region in tectonic units, whose bounding faults are responsible for most of the seismic activity.

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Section: Introductionmentioning

confidence: 99%

Rating of seismicity and reconstruction of the fault geometries in northern Tien Shan within the project “Seismic Hazard Assessment for Almaty”

Torizin

Jentzsch

Malischewsky

et al. 2009

Journal of Geodynamics

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“…Совместное обращение приемных функций про-дольных и поперечных волн [Vinnik et al, 2004] обеспечивает робастные оценки скорости попе-речных волн и менее точные оценки скорости про-дольных волн, а также отношения скоростей про-дольных и поперечных волн. Поиск оптимальных, в смысле наименьших квадратов, моделей выпол-няется методом модельного отжига [Mosegaard, Vestergaard, 1991].…”

Section: совместное обращение приемных функций продольных и поперечныunclassified

“…Задача картирования границы литосфера -астено-сфера упрощается при использовании приемных функций поперечных волн [Farra, Vinnik, 2000], так как в этом случае обменные волны Sp от глубоких границ вступают раньше, чем многократные коро-вые волны. Оптимальные результаты достигаются при совместном обращении приемных функций продольных и поперечных волн [Vinnik et al, 2004].…”

Section: Introductionunclassified

Crust and Mantle of the Baikal Rift Zone From P- And S-Wave Receiver Functions

Vinnik

Oreshin

Tsydypova³

et al. 2017

Geodin. tektonofiz.

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Abstract:We have obtained P-wave and S-wave receiver functions for 10 broadband seismograph stations in the Baikal rift zone (BRZ) and inverted them for seismic velocity models of the crust and upper mantle. The thinnest crust (30-35 km) is found in the Baikal basin, the thickest in the East Sayan uplift (45-50 km). Intermediate values (40 km) are found in the BRZ at distances around 100 km from Lake Baikal. A high (at least 1.8) Vp/Vs ratio is observed in the middle and lower crust. It exceeds 2.0 at some stations. In our opinion, the highest Vp/Vs ratios are due to fluid-filled porosity with a high pore pressure. The seismic lithosphere -asthenosphere boundary (LAB) is manifested by a shear velocity drop from 4.5 km/s to 4.0-4.2 km/s. Beneath the Baikal basin, the LAB is located at a depth not more than 50 km, and the S velocity drop is maximal (10 %). A similar structure is found outside the basin, underneath a segment of the East Sayan uplift. At other locations in the BRZ, a typical depth of the LAB varies from 80 to 90 km. Having considered changes in the depth of the 410 km seismic discontinuity, we cannot find any evidence of an elevated temperature of a hypothetical thermal plume beneath the BRZ.Key words: сrust; Vp/Vs ratio; fluid-filled porosity; mantle; mantle plume; lithosphere -asthenosphere boundary GEODYNAMICS & TECTONOPHYSICS P U B L I S H E D B Y T H E I N S T I T U T E O F T H E E A R T H ' S C R U S T S I B E R I A N B R A N C H O F R U S S I A N A C A D E M Y O F S C I E N C E S R e c e n t G e o d y n a m i c s RESEARCH ARTICLEReceived: August 13, 2017 Revised: September 20, 2017 Recommended by K.Zh. Seminsky Accepted: October 18, 2017For citation : Vinnik L.P., Oreshin S.I., Tsydуpova L.R., Mordvinova V.V., Kobelev M.M., Khritova M.A., Tubanov Ts.A., 2017. Crust and mantle of the Baikal rift zone from P-and S-wave receiver functions.

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“…However in most cases, it is safe to say that cooling initiated, seemingly in a somewhat poly-phased fashion, during the last 10 to 15 Ma. These cooling curves in the models might thus represent the timing of the denudation of the modern Tien Shan orogenic edifice and can be corroborated by several lines of independent geological evidence from such fields as sedimentology [Cobbold et al, 1994;Métivier & Gaudemer, 1997;Dill et al, 2007], magneto-stratigraphy [Sun et al, 2004;Charreau et al, 2005;Huang et al, 2006;Ji et al, 2008], geomorphology and structure [Tibaldi et al, 1997;Yin et al, 1998;Burbank et al, 1999;Abdrakhmatov et al, 2001;Thompson et al, 2002;Buslov et al, 2003;Fu et al, 2003;Hubert-Ferrari et al, 2007;Oskin & Burbank, 2007], geophysics [Trapeznikov et al, 1997;Bielinski et al, 2003;Rybin et al, 2004;, geodesy [Abdrakhmatov et al, 1996;Reigber et al, 2001;Vinnik et al, 2004;Tychkov et al, 2008], and other geochronological studies [Sobel & Dumitru, 1997;Bullen et al, 2001;Sobel et al, 2006;De Grave et al, 2007a;Heermance et al, 2007]. We should caution the reader that this Late Cenozoic feature is mainly obtained by modelling the AFT data [Laslett et al, 1987;Ketcham et al, 2000].…”

Section: Termochronologymentioning

confidence: 99%