25,000 Years long seismic cycle in a slow deforming continental region of Mongolia

Bollinger, Laurent; Klinger, Yann; Forman, Steven L.; Chimed, Odonbaatar; Bayasgalan, A.; Munkhuu, Ulziibat; Davaasuren, Ganzorig; Dolgorsuren, Tulga; Enkhee, Bayarsaikhan; Дэмбэрэл, С.

doi:10.1038/s41598-021-97167-w

Cited by 12 publications

(4 citation statements)

References 41 publications

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“…Indeed, further studies could reveal longer intervals, but even doubling or tripling this value limits the quiescence period within the Holocene and the Late Pleistocene. Even in slow deforming continental regions, substantiated recurrence intervals fall within 20-30 ka (Bollinger et al, 2021). This estimate is close to Trifonov and Machette (1993) estimate for the World Map of Major Active Faults.…”

Section: The Concept Of An Active Faultsupporting

confidence: 86%

The Database of the Active Faults of Eurasia (AFEAD): Ontology and Design behind the Continental-Scale Dataset

Zelenin

Bachmanov

Garipova

et al. 2021

Preprint

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Abstract. Active faults are those faults on which movement is possible in the future. It draws particular attention to active faults in geodynamic studies and seismic hazard assessment. Here we present a high-detail continental-scale geodatabase: The Active Faults of Eurasia Database (AFEAD). It comprises 46,775 objects stored in the shapefile format with spatial detail sufficient for a map of scale 1:1M. Fault sense, a rank of confidence in activity, a rank of slip rate, and a reference to source publications are provided for each database entry. Where possible, it is supplemented with a fault name, fault zone name, abbreviated fault parameters (e.g., slip rate, age of the last motion, total offset), and text information from the sources. The database was collected from 612 sources, including regional maps, databases, and research papers. AFEAD facilitates a spatial search for local studies. It provides sufficient detail for planning a study of a particular fault system and guides deeper bibliographical investigations if needed. This scenario is particularly significant for vast Central and North Asia areas, where most studies are available only in Russian and hardcopy. Moreover, the database model provides the basis for GIS-based regional and continental-scale integrative studies. The database is available at https://doi.org/10.13140/RG.2.2.10333.74726 and via web map at http://neotec.ginras.ru/index/mapbox/database_map.html (last access: July 30, 2021). Some database representations with supplementary data are hosted at http://neotec.ginras.ru/index/english/database_eng.html.

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Section: The Concept Of An Active Faultsupporting

confidence: 86%

The Database of the Active Faults of Eurasia (AFEAD): Ontology and Design behind the Continental-Scale Dataset

Zelenin

Bachmanov

Garipova

et al. 2021

Preprint

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“…The case of SDCR is really significant from this viewpoint. Slow slipping faults showcase a wide range of behaviors varying from almost absent background seismicity to devastating clustered seismic activity (M w > 8) [373]. Such a property poses a serious challenge to seismic hazard assessment because only a limited number of paleoseismological recordings are available.…”

Section: Relationships Between Seismicity and Global Geodynamicsmentioning

confidence: 99%

Earth’s gradients as the engine of plate tectonics and earthquakes

Zaccagnino

Doglioni

2022

Riv. Nuovo Cim.

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The processes occurring on the Earth are controlled by several gradients. The surface of the Planet is featured by complex geological patterns produced by both endogenous and exogenous phenomena. The lack of direct investigations still makes Earth interior poorly understood and prevents complete clarification of the mechanisms ruling geodynamics and tectonics. Nowadays, slab-pull is considered the force with the greatest impact on plate motions, but also ridge-push, trench suction and physico-chemical heterogeneities are thought to play an important role. However, several counterarguments suggest that these mechanisms are insufficient to explain plate tectonics. While large part of the scientific community agreed that either bottom-up or top-down driven mantle convection is the cause of lithospheric displacements, geodetic observations and geodynamic models also support an astronomical contribution to plate motions. Moreover, several evidences indicate that tectonic plates follow a mainstream and how the lithosphere has a roughly westerly drift with respect to the asthenospheric mantle. An even more wide-open debate rises for the occurrence of earthquakes, which should be framed within the different tectonic setting, which affects the spatial and temporal properties of seismicity. In extensional regions, the dominant source of energy is given by gravitational potential, whereas in strike-slip faults and thrusts, earthquakes mainly dissipate elastic potential energy indeed. In the present article, a review is given of the most significant results of the last years in the field of geodynamics and earthquake geology following the common thread of gradients, which ultimately shape our planet.

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“… 11 ). Locally, the expression of surface ruptures can be highly variable, implying frequent hanging wall collapses, fault-related fold scarps, or pressure ridges 12 – 16 , which complicates the quantification of displacement. In the case of historical and paleo-earthquakes ruptures along megathrusts systems, identifying and quantifying surface ruptures are even more difficult.…”

Section: Introductionmentioning

confidence: 99%

Surface rupture and landscape response in the middle of the great Mw 8.3 1934 earthquake mesoseismal area: Khutti Khola site

Riesner

Bollinger

Rizza

et al. 2023

Sci Rep

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Large earthquakes breaking the frontal faults of the Himalayan thrust system produce surface ruptures, quickly altered due to the monsoon conditions. Therefore, the location and existence of the Mw8.3 1934 Bihar–Nepal surface ruptures remain vividly disputed. Even though, previous studies revealed remnants of this surface rupture at the western end of the devastated zone, ruptures extent remains undocumented in its central part. Evidence for recent earthquakes is revealed along the frontal thrust in this region. The Khutti Khola river cuts an 8 m-high fault scarp exposing Siwalik siltstone thrusted over recent alluvial deposits, with faults sealed by a colluvial wedge and undeformed alluvial sediments. Detrital charcoals radiocarbon dating reveals that the last event occurred between the seventeenth century and the post-bomb era, advocating for the 1934 earthquake as the most recent event. In the hanging wall, fluvial terraces associated with fault scarps were abandoned after a penultimate event that happened after the tenth century, a rupture we associate with the historic earthquake of 1255CE. Slips of 11–17 m and 14–22 m for the 1934 and 1255 earthquakes, respectively, compare well with the ~ 10–15 m slip deficit accumulated between the two earthquakes, suggesting that most of the deformation along the front is accommodated by surface-rupturing earthquakes.

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25,000 Years long seismic cycle in a slow deforming continental region of Mongolia

Cited by 12 publications

References 41 publications

The Database of the Active Faults of Eurasia (AFEAD): Ontology and Design behind the Continental-Scale Dataset

The Database of the Active Faults of Eurasia (AFEAD): Ontology and Design behind the Continental-Scale Dataset

Earth’s gradients as the engine of plate tectonics and earthquakes

Surface rupture and landscape response in the middle of the great Mw 8.3 1934 earthquake mesoseismal area: Khutti Khola site

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