3D Gravity, FTG and Magnetic Modeling: the new IGMAS+ Software

Schmidt, Sabine; Götze, H.-J.; Fichler, Ch.; Ebbing, J.; Alvers, Michael R.

doi:10.3997/2214-4609-pdb.166.d_pp_06

Cited by 22 publications

(15 citation statements)

References 1 publication

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“…[25] The software used for the gravity modeling was IGMAS+, an extension of the original 3-D modeling package IGMAS developed by Götze [1984]; IGMAS+ is a modern interpretation system with geographic information system functionality [Götze and Schmidt, 2002;Schmidt et al, 2004Schmidt et al, , 2010. The system uses polyhedrons with triangulated surfaces to approximate bodies of density and/or magnetic susceptibility within the Earth's crust and mantle, the geometries of which are defined by a number of parallel vertical modeling sections [Götze and Lahmeyer, 1988].…”

Section: Methods and Constraining Datamentioning

confidence: 99%

Three‐dimensional density modeling of the EGM2008 gravity field over the Mount Paekdu volcanic area

Choi

Götze

2013

JGR Solid Earth

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[1] Here we use the global gravity field data set EGM2008 for 3-D crustal density modeling of the Mount Paekdu stratovolcano and surrounding area located on the border between North Korea and China. Curvature analysis and Euler deconvolution are used to assist interpretation, and the 3-D model is constrained by multiple geological and geophysical data sets. Mount Paekdu is characterized by a low Bouguer anomaly of À110 × 10 À5 m/s 2 , which is caused by the combined gravity effects of (1) a depth to the Moho of about 40 km, (2) a zone with lower P wave velocity and density than the surrounding, (3) low density volcanic rocks on the surface, and (4) the presence of a magma chamber that has not previously been identified. The modeled magma chamber has a mean thickness of 5 km and a density of about 2350 kg/m 3 and is located <10 km from the surface. Magma chambers are also modeled beneath Mount Wangtian and Mount Nampotae. However, the results of the 3-D density modeling do not confirm the existence of a previously proposed midcrustal low-velocity zone in the area 70 km to the north of Mount Paekdu. Since the Pliocene, volcanic activity in the Mount Paekdu region has migrated from the east coast of North Korea to the northwest, following the path of NW-SE trending faults.

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Section: Methods and Constraining Datamentioning

confidence: 99%

Three‐dimensional density modeling of the EGM2008 gravity field over the Mount Paekdu volcanic area

Choi

Götze

2013

JGR Solid Earth

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“…The objects extracted in the OOA part were re-constructed in IGMAS+ (3D Interactive Gravity and Magnetic Application System; Götze and Lahmeyer, 1988;Schmidt et al, 2010), which facilitates interactive forward modelling of the subsurface in an object-oriented environment. The results from OOA were exported as classified cross sections that were used to constrain the shape of the objects through the reconstruction process.…”

Section: Objects Reconstructionmentioning

confidence: 99%

3D object-oriented image analysis in 3D geophysical modelling: Analysing the central part of the East African Rift System

Fadel

Meijde

Kerle

et al. 2015

International Journal of Applied Earth Observation and Geoinfor

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Non-uniqueness of satellite gravity interpretation has traditionally been reduced by using a priori information from seismic tomography models. This reduction in the non-uniqueness has been based on velocity-density conversion formulas or user interpretation of the 3D subsurface structures (objects) based on the seismic tomography models and then forward modelling these objects. However, this form of object-based approach has been done without a standardized methodology on how to extract the subsurface structures from the 3D models. In this research, a 3D object-oriented image analysis (3D OOA) approach was implemented to extract the 3D subsurface structures from geophysical data. The approach was applied on a 3D shear wave seismic tomography model of the central part of the East African Rift System. Subsequently, the extracted 3D objects from the tomography model were reconstructed in the 3D interactive modelling environment IGMAS+, and their density contrast values were calculated using an object-based inversion technique to calculate the forward signal of the objects and compare it with the measured satellite gravity. Thus, a new object-based approach was implemented to interpret and extract the 3D subsurface objects from 3D geophysical data. We also introduce a new approach to constrain the interpretation of the satellite gravity measurements that can be applied using any 3D geophysical model.

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“…The software used for the gravity modelling was IGMAS 3‐D modelling package developed by Götze (1984). IGMAS+ was later extended towards a modern interpretation system with GIS functionality today (Götze & Schmidt 2002; Schmidt et al 2004, 2010). The kernel of the system uses polyhedrons with triangulated surfaces to approximate bodies of constant density and/or magnetic susceptibility within the earth's crust and mantle, the geometry of which is defined by a number of parallel vertical modelling sections (Götze & Lahmeyer 1988).…”

Section: 3‐d Gravity Modellingmentioning

confidence: 99%

3-D density modelling of underground structures and spatial distribution of salt diapirism in the Dead Sea Basin

Choi¹,

Götze²,

Meyer

et al. 2011

Geophysical Journal International

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S U M M A R YA new compilation of Bouguer gravity data stemming from airborne, shipborne and terrestrial data set in the entire Dead Sea Basin (DSB) was reinterpreted by applying 3-D density modelling that incorporated independent information on other geophysical researches allowing for regional and residual filtering in the gravity field, carrying out curvature analysis and Euler deconvolution of the combined gravity field. 3-D density modelling enables us to detailed resolution of upper crustal structures from the southern to the northern subbasin below the saline Dead Sea. 3-D gravity modelling led to the identification of three salt structures, which are found beneath the Sedom area, the Lisan Peninsula and the Dead Sea. In the vicinity of the western margin of the Dead Sea, a salt diapir segment with a thickness of about 4 km has been identified at a top depth of about 2 km, which has not been recognised by any other geophysical interpretations. The thickness of the sedimentary infill overlying the basement in the DSB decreases from 14 km in the vicinity of the Lisan Peninsula to 8 km in the northern and the southern subbasins. Large negative gravity anomalies (lower than -100 × 10 −5 m s −2 ) observed in the DSB correspond with the spatial distribution of salt diapirism with an average density of 2 100 kg m −3 . The shallower microearthquakes registered in the DSB are related to the movement of salt diapir in the DSB.

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3D Gravity, FTG and Magnetic Modeling: the new IGMAS+ Software

Cited by 22 publications

References 1 publication

Three‐dimensional density modeling of the EGM2008 gravity field over the Mount Paekdu volcanic area

Three‐dimensional density modeling of the EGM2008 gravity field over the Mount Paekdu volcanic area

3D object-oriented image analysis in 3D geophysical modelling: Analysing the central part of the East African Rift System

3-D density modelling of underground structures and spatial distribution of salt diapirism in the Dead Sea Basin

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