Crustal structure of the southeastern Tibetan Plateau from gravity data: New evidence for clockwise movement of the Chuan–Dian rhombic block

Xuan, Songbai; Shen, Chongyang; Shen, Wenbin; Wang, Jiapei; Jian-guo, LI

doi:10.1016/j.jseaes.2018.03.018

Cited by 7 publications

(6 citation statements)

References 44 publications

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“…(2009a, 2009b, 2011) and Xuan et al. (2018) employed a relationship between the harmonic number N and the NFG maximum responses to find the optimum values of N . This value is found at the local maxima of the NFG values (Aghajani et al., 2009b).…”

Section: Methodsmentioning

confidence: 99%

“…An important challenge in the NFG method is determining the optimum harmonic number (N) for generating the correct harmonic response. Aghajani et al (2009aAghajani et al ( , 2009bAghajani et al ( , 2011 and Xuan et al (2018) employed a relationship between the harmonic number N and the NFG maximum responses to find the optimum values of N. This value is found at the local maxima of the NFG values (Aghajani et al, 2009b). These values coincide well with the central depth of the anomalous bodies.…”

Section: Methodsmentioning

confidence: 99%

“…In the conservative NFG method, the optimal number of harmonics is estimated by N value analysis (Zeng et al, 2012). N-restricted processing was discussed by Aydin (1997), Aghajani et al (2009aAghajani et al ( , 2009bAghajani et al ( , 2011, Berezkin (1988), Dondurur (2005), Sindirgi et al (2008, Oruç (2011), Xuan et al (2018) and Zhang and Meng (2015).…”

Section: Geophysical Backgroundsmentioning

confidence: 99%

“…Aghajani et al., 2009a, 2009b, 2011; Zeng et al., 2002) or structural boundaries (e.g. Pamukçu & Akçig, 2011; Sindirgi et al., 2008; Xuan et al., 2015, 2018). Moreover, NFG gives a useful interpretation of electromagnetic data (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Adopting normalized full gradient method for regional‐scale gravity modelling: A case study for Northwestern Iran

Alipour,

Motaghi,

Mousavi

et al. 2023

Geophysical Prospecting

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The normalized full gradient was developed to determine anomalous bodies, such as oil and gas fields or simple geological structures studies. We believe that even in complicated geology, normalized full gradient is practical. We introduce data preprocessing and use step‐by‐step simple‐to‐complicated synthetic tests to develop previous researchers’ ideas for regional‐scale gravity modelling. One of the most important steps of the normalized full gradient is the determination of the N optimum value. We found that prevalent methods such as the standard spectral or maxima method are feasible in simple structures only. So, we have suggested the imaging criteria routine for complicated cases. We trace maximum normalized full gradient responses to detect the normalized full gradient responses at the increasing harmonic numbers as the transition of the extensive part of the anomaly to the sharp part of that. With imaging criteria for the determination of N optimum values, the complicated synthetic test results show the success of the normalized full gradient to understand complicated gravity signals. In the real case, we have studied the Northwestern Iran normalized full gradient model of the Bouguer ground gravity data beneath the seismic profile and prepared a P receiver function depth section to uncover the geometry of the Moho boundary and important interfaces in the crust. We suggest the inferred synthetic model from the Bouguer ground gravity anomaly and P receiver function depth section to normalized full gradient trustworthy test in real cases. According to the synthetic test results, we understand the frame of the normalized full gradient responses in the semi‐real case and truthful responses in the real case. Along with this, we study the second ground gravity profile of Northwestern Iran in a good resolution to uncover the deeper structures. The real case results show the possibility of Moho offset and thinning lithosphere beneath the North Tabriz Fault lithospheric boundary, the possible source of Sahand volcanic centre at the west side of the Moho offset beneath North Tabriz Fault, the deep root of the Sabalan volcanic centre in the lower crust and the lithospheric and asthenospheric wedge with the density contrast beneath Sahand–Sabalan volcanic centres. One of the most important results of our study is the lithosphere–asthenosphere boundary offset and stepped Moho possibility beneath the Talesh Mts next to the South Caspian Basin boundary.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Geophysical Backgroundsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Adopting normalized full gradient method for regional‐scale gravity modelling: A case study for Northwestern Iran

Alipour,

Motaghi,

Mousavi

et al. 2023

Geophysical Prospecting

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“…The RRF is a boundary fault between the Indochina and South China plates and is also the boundary of the Sichuan-Yunnan Block (SYB), which is the southeastward extrusion channel for mantle and crustal materials beneath the Tibetan Plateau. From a scientific perspective, studying the RRF in detail is important for further understanding the geodynamic processes occurring in the southeastern marginal region of the Tibetan Plateau (Wang et al, 1998;Gilley et al, 2003;Schoenbohm et al, 2005;Xuan et al, 2018;He et al, 2020;Yu et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Strong earthquake recurrence interval in the southern segment of the Red River Fault, southwestern China

Zhou,

Li,

Chang

et al. 2023

Front. Earth Sci.

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Along the southeastern margin of the Tibetan Plateau, an important boundary fault, known as the Red River Fault (RRF), formed during the extrusion of mantle and lower crustal materials beneath the Tibetan Plateau. The characteristics of RRF activity are important for understanding the tectonic evolution of the southeastern margin of the Tibetan Plateau. There is less knowledge about the strong earthquake recurrence interval in the southern segment of the RRF than about its northern segment. In this study, based on the characteristics of the active tectonic landform, three paleoseismic trenches were excavated in Adipo Village north of Honghe County in the southern segment of the RRF. In these trenches, three paleoseismic events that occurred in the middle and late Holocene were identified. According to the 14C dating results, these events were constrained to 785–504 BC, 26–492 AD, and 1,415–1857 AD. The average earthquake recurrence interval was determined to be approximately 960–1,320 a.

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Crustal structure of the Qiangtang and Songpan-Ganzi terranes (eastern Tibet) from the 2-D normalized full gradient of gravity anomaly

Xuan¹,

Shen²

2022

Geodesy and Geodynamics

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Crustal structure of the southeastern Tibetan Plateau from gravity data: New evidence for clockwise movement of the Chuan–Dian rhombic block

Cited by 7 publications

References 44 publications

Adopting normalized full gradient method for regional‐scale gravity modelling: A case study for Northwestern Iran

Adopting normalized full gradient method for regional‐scale gravity modelling: A case study for Northwestern Iran

Strong earthquake recurrence interval in the southern segment of the Red River Fault, southwestern China

Crustal structure of the Qiangtang and Songpan-Ganzi terranes (eastern Tibet) from the 2-D normalized full gradient of gravity anomaly

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