Seismicity of the Baikal rift system from regional network observations

Радзиминович, Н. А.; Гилева, Н. А.; Мельникова, В. И.; Ochkovskaya, M.G.

doi:10.1016/j.jseaes.2012.10.029

Cited by 35 publications

(13 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is situated at the boundary of the Siberian platform (craton) to the northwest and the Mongolian fold belt to the southeast. More recent studies prefer a mixture of several effects, giving a rather complex evolutionary picture (see the many references cited by Zhao et al 2006 andRadziminovich et al 2013). The Baikal rift zone is characterized by high surface heat flow, flanking normal faults, and slower upper-mantle velocity.…”

Section: East Asian Hotspotsmentioning

confidence: 99%

Multiscale Seismic Tomography

Zhao

2015

100

View full text Add to dashboard Cite

Section: East Asian Hotspotsmentioning

confidence: 99%

Multiscale Seismic Tomography

Zhao

2015

100

View full text Add to dashboard Cite

“…The instrumental seismicity recorded over the last 50 years by the regional network of the Institute of the Earth Crust in Irkutsk within the southwest Baikal rift region (e.g., Radziminovich et al, ) shows microseismic activity along the Sayan fault and within the Tunka basin (Figure b). The magnitudes of earthquakes are lower than Mw 5, with few events with magnitude close to 6 recorded in the Tunka basin and the southwestern Baikal Lake.…”

Section: Seismotectonic Settingmentioning

confidence: 99%

Characterizing the Present‐Day Activity of the Tunka and Sayan Faults Within Their Relay Zone (Western Baikal Rift System, Russia)

et al. 2018

View full text Add to dashboard Cite

The Sayan and Tunka faults are located at the boundary between the northernmost mountain belt of Central Asia (the Sayan‐Baikal ranges) and the Siberian platform. These prominent crustal structures were involved in the opening of the southern Baikal rift system since the beginning of the Cenozoic and define large‐scale sharp morphotectonic features. Despite low instrumental seismic activity, Late Pleistocene‐Holocene morphotectonic features along the two faults indicate that the faults are active and have the capacity to produce strong earthquakes. A careful mapping of the most recent trace of activity, within the south‐eastern parts of the two faults where they merge within a relay zone, demonstrates that they correspond now to left‐lateral‐reverse faults, suggesting a recent inversion of their vertical component. We also show that the two faults are now structurally connected via a young surface rupture and that no obvious post‐Last Glacial Maximum ruptures are observed along the central part of the Sayan Fault beyond its junction zone with the Tunka fault. This suggests that the left‐lateral strike‐slip deformation is transferred from the eastern Sayan fault to the Tunka fault. A detailed morphotectonic study along the south‐eastern Sayan fault allows estimating a left‐lateral slip rate between 1.3 (min) and 3.9 mm/year (max). Finally, a critical review of Russian paleoseismic data, combined with our paleoseismological investigations, allows us to propose that the mean recurrence time along the two faults is on the order of 4 kyr and that they may have either ruptured together or during seismic clusters.

show abstract

“…Поле «Сейсмоактивность» заполняется «Да» автоматически при условии, если заполнены поля «Палеосейсмогеологические при-знаки активности» (приуроченность к разлому па-леосейсмодислокации), «Последнее инструменталь-ное или историческое землетрясение с М≥5.5», «Ас-социируемый КСИ («Композитный сейсмогенный источник» в русскоязычных переводных публика-циях [Lunina et al, 2012b], «Composite seismogenic source» в иностранной литературе [Basili et al, 2008])» и/или «Ассоциируемый ИГГСИ («индивиду-альный геолого-геофизический сейсмогенный ис-точник», «Individual seismogenic sourse» [Basili et al, 2008])». Приуроченность того или иного землетря-сения к разлому определялась автором на основа-нии детального изучения данных о параметрах оча-гов землетрясений инструментального периода с M≥5.5, собранных из публикаций и электронных ре-сурсов [Solonenko et al, 1993;, 2003, 2004a, 2004bRadziminovich et al, 2013;Global CMT Catalog;Geophysical Survey…, 2016]. При анализе во внимание принимались нодальные плоскости, тип подвижки в очаге, глубина гипоцен-тра и положение эпицентра.…”

Section: сейсмоактивные разломыunclassified

The Digital Map of the Pliocene–quaternary Crustal Faults in the Southern East Siberia and the Adjacent Northern Mongolia

Лунина¹

2016

Geodin. tektonofiz.

View full text Add to dashboard Cite

Introduction. Studying and mapping of faults in the Earth's crust is one of the priority objectives in structural geology and tectonophysics. Generally, faults are associated with mineral deposits, thermal springs and earthquakes, and fault zones are areas of the most dangerous geological processes and various geophysical anomalies. In this regard, digital maps and databases on faults and fault zones are highly demanded both for science and practical applications. This paper presents a new digital map of the southern East Siberia and the adjacent Northern Mongolia, which shows faults in the crust which were active in the Pliocene-Quaternary. The map covers the territory between 96-124°E to 49-58°N. An annex to this paper contains files with geospatial data on the mapped faults.The input data, and their synthesis. We consolidated the database on faults active in the Pliocene-Quaternary stage of the crust development and mapped the faults on the basis of digital elevation models SRTM 90 m [Consortium for Spatial Information, 2004], space images from Landsat series satellites (Google Earth), electronic bathymetry data on Lake Baikal [Sherstyankin et al., 2006], topographic maps (1:200000 scale), regional and global earthquake catalogs, as well as the publications and maps based on the earlier studies of active tectonics and earthquake traces with the use of the ActiveTectonics Information System developed by the research team lead by the author of this paper [Lunina et al., 2014b]. For the major part of the southern East Siberia, we collected and processed our field observation data on faults and related deformation features (Fig. 1). The geographic locations of the faults were mapped with the use of MapInfo GIS. The precise detection of tectonic faults, topographically represented by river lineaments and benching, was ensured by the synthesis of cartographic, literature and field materials. A significant number of the detected lineaments, that were not confirmed by any data due to the poor knowledge of some regions in the southern East Siberia and the adjacent territories, are included in the database with a special mark and shown on the map as inferred faults.Results and discussion. The digital map (Fig. 2) shows 1678 faults composed of 2315 segments, including 1097 true, and 1218 inferred ones, identified by the fault strike changes or fragmentation. Using the consolidated fault database, we constructed maps showing fault segments differing in the degree of activity (Fig. 3), displacement types ( Fig. 4 and 7), and ages of the last activations (Fig. 8). Besides, we constructed a map of seismically active faults that can generate M≥5.5 earthquakes. The analysis of the thematic maps of faults gives grounds to conclusions that have been either partly supported or controversial, yet now are based on the factual justification of the faults in the ActiveTectonics Information System database. It is shown that the Baikal rift zone is bordered in the southwest by the Busiyngol basin and the West Belino-Busiyngo...

show abstract

Seismicity of the Baikal rift system from regional network observations

Cited by 35 publications

References 46 publications

Multiscale Seismic Tomography

Multiscale Seismic Tomography

Characterizing the Present‐Day Activity of the Tunka and Sayan Faults Within Their Relay Zone (Western Baikal Rift System, Russia)

The Digital Map of the Pliocene–quaternary Crustal Faults in the Southern East Siberia and the Adjacent Northern Mongolia

Contact Info

Product

Resources

About