Three-dimensional interpretation of sparse survey line MT data: Synthetic examples

Lin, Changhong; Tan, Handong; Qing, Shu; Tong, Tuo; Zhang, Yumei

doi:10.1007/s11770-012-0308-6

Cited by 2 publications

(2 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous works [Siripunvaraporn et al, 2005;Lin et al, 2011aLin et al, , 2012 have proved that reliable 3-D structure close to the sparse lines can be obtained by 3-D inversion. To clearly understand the complex deep structures beneath Namche Barwa, four vertical cross sections ( Figure 6) close to the MT lines are plotted along both the SW-NE direction (AA 0 ) and NW-SE direction (BB 0 , CC 0 , and DD 0 ).…”

Section: Inversion Resultsmentioning

confidence: 99%

“…A synthetic test is presented to investigate whether the observed conductive zones and resistive regions can be constrained by these sparse data and limited frequency range used. Although previous synthetic and field examples [ Siripunvaraporn et al ., ; Lin et al ., , ] have demonstrated that reasonable 3‐D structure close to the sparse lines can be obtained by 3‐D inversion, the targets in those examples are shallower than the structures in this study. In order to assess the reliability and resolution capability of our observed data, we designed the model in Figure a and computed the synthetic responses with Gaussian noise at the same frequencies of 194–0.00275 Hz at the same 83 sparse sites.…”

Section: Three‐dimensional Resistivity Imagingmentioning

confidence: 99%

See 1 more Smart Citation

Crustal structure beneath Namche Barwa, eastern Himalayan syntaxis: New insights from three‐dimensional magnetotelluric imaging

et al. 2017

Self Cite

View full text Add to dashboard Cite

The eastern terminations of the Himalayan orogeny, named Namche Barwa, are considered a vital natural laboratory in the Tibetan plateau for geodynamics due to its distinctive geological and geomorphological characteristics. Magnetotelluric (MT) data measured at 83 sites around the Namche Barwa are imaged by three‐dimensional (3‐D) inversion to better reveal the crustal structure of the eastern Himalaya. The results show a complex and heterogeneous electrical structure beneath the Namche Barwa. The electrical conductors distributed in the middle and lower crust around the Namche Barwa provide additional evidence for the “crustal flow” model if they are considered as some parts of the flow in a relatively large‐scale region. The near‐surface resistivity model beneath the inner part of Namche Barwa conforms with the locations of hot spring and fluid inclusions, the brittle‐ductile transition, and the 300°C–400°C isotherm from previous hydrothermal studies. Relatively resistive upper crust (>800 Ωm) is underlain by a more conductive middle to lower crust (<80 Ωm). The electrical characteristics of the thermal structure at shallow depth indicate an accumulation of hydrous melting, a localized conductive steep dipping zone for decompression melting consistent with the “tectonic aneurysm” model for explaining the exhumation mechanism of metamorphic rocks at Namche Barwa. The results also imply that both surface processes and local tectonic responses play a vital role in the evolution of Namche Barwa. An alternative hypothesis that the primary sustained heat source accounts for the local thermal‐rheological structure beneath Namche Barwa is also discussed.

show abstract

Section: Inversion Resultsmentioning

confidence: 99%

Section: Three‐dimensional Resistivity Imagingmentioning

confidence: 99%