The MTPy software package for magnetotelluric data analysis and visualisation

Kirkby, Alison; Zhang, Fei; Peacock, Jared; Hassan, Rakib; Duan, Jingming

doi:10.21105/joss.01358

Cited by 65 publications

(31 citation statements)

References 10 publications

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“…The phase tensor (Caldwell et al 2004) was also computed and represented for each site and period (Fig. 7b) using MTPy software (Kirkby et al 2019). The results are very scattered with high skew angle values, supporting general 3D data behavior.…”

Section: Data Acquisition Processing and Analysismentioning

confidence: 59%

Magnetotelluric characterization of the Alhama de Murcia Fault (Eastern Betics, Spain) and study of magnetotelluric interstation impedance inversion

Martí

Queralt

Marcuello

et al. 2020

Earth Planets Space

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The Lorca earthquake (May 11th, 2011, Mw 5.2) stands as the most destructive one in Spain over the last 50 years, interpreted as having occurred in an intersegment zone of the strike-slip Alhama de Murcia Fault (AMF) (Eastern Betics, Spain). Magnetotelluric data were acquired along a profile to the SW of Lorca (La Torrecilla profile), to characterize its signature at depth, as part of the multidisciplinary project "INTERGEOSIMA". Given the short distance between stations, some station pairs were recorded simultaneously, with magnetic sensors in only one of them. In order to properly understand the resulting impedances (called interstation impedances), and the effects of inverting them, we used synthetic models to compare the impedances and the interstation impedances and to analyze the corresponding inversion results, together with the inversion of the quasi-impedance (inversion of the interstation impedances, considering them as impedances). The results are sensitive to the location of the magnetic sensors and the resistivity underneath, but in general the use of the quasi-impedances in the inversion can be considered a valid procedure. Both the 2D and the 3D resistivity models obtained through the inversion allowed us to complement the previous ERT models and represent the continuation of the main fault gouge in depth showing its extension towards the SE.

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Section: Data Acquisition Processing and Analysismentioning

confidence: 59%

Magnetotelluric characterization of the Alhama de Murcia Fault (Eastern Betics, Spain) and study of magnetotelluric interstation impedance inversion

Martí

Queralt

Marcuello

et al. 2020

Earth Planets Space

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“…Given a resistivity of around 100 -300 Ohm-m (e.g., Ho et al 2014) from the surface direct current resistivity measurements, one may expect roughly that the maximum skin depth can be then approach about 2 -4 km if the lowest frequency is 4 Hz for the AMT surveys. Figure 4a shows the rose plots of the impedance, phase tensors, and the tippers produced with the MTpy package (Kirkby et al 2019) in the study area. The dominated impedance strike is about 175° and is consistent to the azimuth of the phase tensor.…”

Section: Survey Configurations and Data Processingmentioning

confidence: 99%

“…In addition, Fig. 4b shows the phase tensor (PT) ellipses (Caldwell et al 2004), skew angle (Bahr 1987), and the Parkinson-convention induction vectors (IVs) of the MT measurements in the study area produced with the MTpy package (Kirkby et al 2019). Following the Parkinson convention (Parkinson 1959), the IVs point to the concentration of the electric currents (i.e., the conductive regions) and therefore are used to infer the presence or absence of lateral resistivity variations.…”

Section: The Dimensionality Analysismentioning

confidence: 99%

An analysis of the subsurface fault systems with audio-magnetotelluric surveys in the western Ilan Plain of NE Taiwan

Chang¹,

Ho²,

Chen³

et al. 2020

Terr. Atmos. Ocean. Sci.

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We used the audio magnetotelluric (AMT) method to delineate subsurface resistivity structures associated with the western Ilan Plain, which is emerged from the orogenic belt in northeastern Taiwan and is thought to be influenced by the opening Okinawa Trough. The most recent extension phase of the Okinawa Trough starting from approximately 0.1 Ma involved ENE-and WSW-trending normal faults off the Ilan Plain. Nevertheless, the region was originally a thrust-and-fold belt related to the subduction of the Philippine Sea Plate under the Eurasia Plate. Our study focuses on how the later opening of the Okinawa Trough has affected this previously compressional region. From the results of the AMT surveys, we found that the area features a series of N-S trending fracture zones in addition to the E-W normal fault systems. Comparing the AMT data with the data from seismic reflection profiles, we found that the normal fault systems are truncated by young strike-slip faults and modified the relief of the rock basement in a recent stage of formation. The western part of the study area is dominated by left-lateral strike-slip faults while the eastern part is dominated by right-lateral strike-slip faults. The findings drawn from our AMT resistivity images as well as from the reinterpreted seismic profiles constitute new evidence that the extrusion regime may have gradually taken over the regional stress state and reset the regional stress-strain conditions that was one dominated by the Okinawa extension in the western and southern part of the Ilan plain.

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“…David Robinson, Adrian Hitchman, Kate Selway, and two anonymous reviewers provided insightful comments that have significantly improved the manuscript. The MTPy (Krieger & Peacock, ; Kirkby et al, ) and Matplotlib (Hunter, ) Python libraries were used to generate the figures shown in this paper. MTPy was also used to generate the input files used for modeling.…”

Section: Acknowledgmentsmentioning

confidence: 99%

Crustal Structure of the Eastern Arunta Region, Central Australia, From Magnetotelluric, Seismic, and Magnetic Data

Kirkby

Duan

2019

JGR Solid Earth

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We present a 3‐D inversion of magnetotelluric data acquired along a 340‐km transect in Central Australia. The results are interpreted with a coincident deep crustal seismic reflection survey and magnetic inversion. The profile crosses three Paleoproterozoic to Mesoproterozoic basement provinces, the Davenport, Aileron, and Warumpi Provinces, which are overlain by remnants of the Neoproterozoic to Cambrian Centralian Surperbasin, the Georgina and Amadeus Basins, and the Irindina Province. The inversion shows conductors near the base of the Irindina Province that connect to moderately conductive pathways from 50‐km depth and to off‐profile conductors at shallower depths. The shallow conductors may reflect anisotropic resistivity and are interpreted as sulfide minerals in fractures and faults near the base of the Irindina Province. Beneath the Amadeus Basin, and in the Aileron Province, there are two conductors associated strong magnetic susceptibilities from inversions, suggesting they are caused by magnetic, conductive minerals such as magnetite or pyrrhotite. Beneath the Davenport Province, the inversion images a conductive layer from ∼15‐ to 40‐km depth that is associated with elevated magnetic susceptibility and high seismic reflectivity. The margins between the different basement provinces from previous seismic interpretations are evident in the resistivity model. The positioning and geometry of the southern margin of the crustal conductor beneath the Davenport Province supports the positioning of the south dipping Atuckera Fault as interpreted on the seismic data. Likewise, the interpreted north dipping margin between the Warumpi and Aileron Province is imaged as a transition from resistive to conductive crust, with a steeply north dipping geometry.

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The MTPy software package for magnetotelluric data analysis and visualisation

Cited by 65 publications

References 10 publications

Magnetotelluric characterization of the Alhama de Murcia Fault (Eastern Betics, Spain) and study of magnetotelluric interstation impedance inversion

Magnetotelluric characterization of the Alhama de Murcia Fault (Eastern Betics, Spain) and study of magnetotelluric interstation impedance inversion

An analysis of the subsurface fault systems with audio-magnetotelluric surveys in the western Ilan Plain of NE Taiwan

Crustal Structure of the Eastern Arunta Region, Central Australia, From Magnetotelluric, Seismic, and Magnetic Data

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