Single-event throws along the Delta Fault (Baikal rift) reconstructed from ground penetrating radar, geological and geomorphological data

Лунина, О. В.; Denisenko, Ivan A.

doi:10.1016/j.jsg.2020.104209

Cited by 12 publications

(8 citation statements)

References 38 publications

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“…In seismic profiles, fault interpretation is based on apparent offsetting of stratigraphic sequences, but in GPR profiles, faults can be detected through: (i) direct reflections from the fault plane/zone; (ii) diffraction hyperbola at the tip of a fault plane; (iii) termination of laterally continuous reflections along a fault; (iv) significant change in reflection amplitude along the fault; (v) across‐fault offset of reflections with varying intensities; and (vi) reflection truncation, sudden change in dip and thickness of reflections across the fault (Cai et al ., 1996; Slater and Niemi, 2003; Lunina and Denisenko, 2020).…”

Section: Ground‐penetrating Radar Studies Along the Kachchh Mainland ...mentioning

confidence: 99%

Mapping the near‐surface trace of the seismically active Kachchh Mainland Fault and its lateral extension in the blind zone, Western India

Maurya

Chowksey

Shaikh

et al. 2022

Near Surface Geophysics

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The W-WNW-striking Kachchh Mainland Fault (KMF) is the largest intra-basinal fault in the Kachchh Rift Basin (KRB) located at the western continental margin of the Indian plate, and is responsible for several historic earthquakes, including the 2001 Bhuj earthquake and the 1956 Anjar earthquake. The objective of the study is to constrain the precise location and near-surface characteristics of the KMF using field and ground penetrating radar (GPR) studies. Efforts were also made to ascertain and map the eastward continuity of the KMF. The fault has a prominent geomorphic expression up to the east of Devisar, where the KMF scarp finally dies out. The KMF marks the lithotectonic contact between Mesozoic rocks in the south and Tertiary rocks in the north. The segmented nature of the KMF has been previously attributed to transverse faults, complex deformation zones and heterogeneous assemblages of unconformable Quaternary deposits. Eight survey sites between Nirona and Sikra were chosen for near-surface investigation of KMF using GPR. Comparatively, high-amplitude radar reflections were received from well-compacted sand-and shale-rich Mesozoic rocks, whereas low-amplitude weak reflections were observed from softer and clay-rich Tertiary rocks. In the upper section of the GPR profiles, Quaternary deposits display lowto moderate-amplitude semi-continuous to wavy reflections. The traceable length of the KMF has been extended eastward by ∼20 km through the current study, which is considered a blind zone as feeble surficial evidence is present, but the fault trace is confirmed near the surface using GPR. The eastern part of the KMF is inferred to be a near-vertical north-dipping normal fault based on GPR data analysis. The tendency of the KMF to transform into a reverse fault in the vicinity of the intersection with transverse faults implies zones of relatively higher stress accumulation that might activate and trigger devastating earthquakes in the future.

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Section: Ground‐penetrating Radar Studies Along the Kachchh Mainland ...mentioning

confidence: 99%

Mapping the near‐surface trace of the seismically active Kachchh Mainland Fault and its lateral extension in the blind zone, Western India

Maurya

Chowksey

Shaikh

et al. 2022

Near Surface Geophysics

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“…Данное заключение подтверждается нашими структурногеологическими и георадиолокационными исследованиями в зоне Дельтового разлома, активизированного при Цаганском землетрясении 1862 г. на оз. Байкал [Lunina, Denisenko, 2020]. Если сравнивать два сегмента зоны разрывов по максимальной ширине и количеству разрывов, то следует заключить, что вклад пластической компоненты в движение рыхлых пород выше на северо-восточном сегменте, что подтверждается также более пологими углами падения большинства нарушений, хотя среди них есть и крутопадающие.…”

Section: заключениеunclassified

Geometry of Recent Rupture Zone at Сape Rytyi Based on Ground Penetrating Radar (Northwestern Coast of Lake Baikal)

Лунина

Denisenko

Gladkov

2022

Geodin. tektonofiz.

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In here, we present the results of the GPR study of the modern rupture zone discovered earlier in the periphery of the Rita River delta flowing into Lake Baikal. The research was aimed at subsurface imaging of dislocation geometry using the Logis-Geotech OKO-2 radar equipped with the ABDL Triton antenna. As a result, the characterizations have been obtained for six 73 to 197 m long profiles across the rupture zone. All disturbances visible on the aerial photography materials are highlighted on the radargrams by the oblique reflection event due to a decrease in the signal amplitude. The rupture zone has two large segments – northeastern and submeridional, – which differ in zone width, number of discontinuities, dip angles, and displacement amounts. The deformation features can be attributed to different amounts of a plastic loamy aggregate of coarse deposits in different parts of the Rita River delta that is indirectly confirmed by weaker signal amplitudes on the northeastern segment. Based on present and previous studies, we proposed that the M=5.2 earthquake occurred on August 13, 1962, in Lake Baikal initiated the gravitational sinking in the Rita river delta edge by subsidence along gently sloped rupture surfaces on one segment and along steeply sloped ones on the other. It is necessary to identify and monitor such phenomena to prevent the development of emergencies associated with the collapse of the coasts of large water reservoirs.

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“…By processing the radar signal data, the receiving device then creates a map using the detected electromagnetic waves, as shown in Figure 1. After the electromagnetic wave is launched, it will be reflected by various rock mass interfaces in the detecting medium due to the electrical differences between the different media [13]. The reflected wave has significant variations in its amplitude, frequency, wave velocity, phase, and other properties due to the varied electrical and geometric features of the materials inside the detecting medium.…”

Section: Principle Of Gpr Detection Technology Figure 1 Schematic Dia...mentioning

confidence: 99%

Application of Signal Imaging Analysis Technology in Prediction and Treatment of Water Inrush in Diversion Tunnel

Ye¹,

Wang²,

Feng³

2022

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A signal imaging analysis technology was proposed to accurately interpret geological radar detection images in order to address the issues of difficult interpretation of radar advance forecast images of water inrush in diversion tunnels in unfavorable geological zones and difficult detection of grouting effects in grouting circles. The waveform, amplitude, and frequency differences in the radar data among various geological bodies in the fracture development zone, broken zone, and water-rich zone can be analyzed by the signal imaging analysis technology, which can extract multiple technical parameters for comprehensive judgment and provide a foundation for the interpretation of geological radar images. In this study, signal mapping analysis technology was used to interpret the geological detection images taken in front of the tunnel face and the surrounding rock geological detection map after cement-polyvinyl alcohol grouting, respectively. The accuracy of the signal mapping analysis technology was confirmed, and the following conclusions were drawn: (1) Geographic Different geological structures, such as fissure zones, broken zones, and water-rich zones, have different reflection signal properties for radar electromagnetic waves. With the help of the image, distinct geological features can be identified and water inrush can be anticipated; (2) Electronic scanning imaging can be used to observe it. The geological radar image feedback of the grouting circle after grouting indicates that the lithology of the grouting circle is complete and the grouting reinforcement and sealing effect is good when the cement-polyvinyl alcohol slurry concretion particles are dense; (3) The numerical analysis results of the seepage field of the tunnel demonstrate that the grouting of the surrounding rock can effectively reduce water seepage and control water gushing. The study's findings offer a specific reference point for the forecasting and management of water gushing in diversion tunnels located in adverse geological regions.

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Single-event throws along the Delta Fault (Baikal rift) reconstructed from ground penetrating radar, geological and geomorphological data

Cited by 12 publications

References 38 publications

Mapping the near‐surface trace of the seismically active Kachchh Mainland Fault and its lateral extension in the blind zone, Western India

Mapping the near‐surface trace of the seismically active Kachchh Mainland Fault and its lateral extension in the blind zone, Western India

Geometry of Recent Rupture Zone at Сape Rytyi Based on Ground Penetrating Radar (Northwestern Coast of Lake Baikal)

Application of Signal Imaging Analysis Technology in Prediction and Treatment of Water Inrush in Diversion Tunnel

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