Determination of the Lithosphere-Asthenosphere Boundary using program LABWA2015

Czechowski, Leszek

doi:10.31223/osf.io/ucvsx

Cited by 2 publications

(4 citation statements)

References 10 publications

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“…It is also worth improving the simple 1 dimensional model of the lithosphere discussed in Sect. 2, which could be done using methods presented in the papers of Czechowski (2018) or Jones et al (2014). Developing standard procedures to use deep dynamic isostasy (DDI, Sect.…”

Section: Discussionmentioning

confidence: 99%

“…This means that the system of Eqs. (1-2) can also be used to determine different thermal and/or elastic properties of the lithosphere (see Czechowski 2018). Methods based on Eqs.…”

Section: Local Isostasymentioning

confidence: 99%

“…However, verification of this assumption is often not possible (see Fig. 2a and Fullea et al 2006;Grinc et al 2014;Krysinski et al 2013Krysinski et al , 2015Czechowski 2018). 2.…”

Section: Local Isostasymentioning

confidence: 99%

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Mantle Flow and Determining Position of LAB Assuming Isostasy

Czechowski

2019

Pure Appl. Geophys.

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The assumption of isostatic equilibrium is often used in geophysics; e.g., the depth of the lithosphere-asthenosphere boundary (LAB) is determined using data regarding the gravity field and topography, together with the assumption of isostasy. However, isostasy implies a hydrostatic state, which is contrary to the mantle convection hypothesis, which states that most of the mantle matter is in motion. We therefore discuss herein the question of when the assumption of isostasy can be used. It is suggested that isostasy may be used for parts of oceanic plates (except for subduction zones, hotspots, and oceanic ridges) and for many continental regions (except for postglacial regions and regions of intensive volcanic or tectonic activity). Moreover, using the results of a numerical model of convection and calculations of dynamic topography, it is shown that some generalization of isostasy is possible in the form of deep dynamic isostasy (DDI). It is also indicated that, for some regions without isostatic equilibrium (e.g., postglacial regions), it is possible to use the ''isostatic'' method with some corrections to the results.

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Section: Discussionmentioning

confidence: 99%

“…This means that the system of Eqs. (1-2) can also be used to determine different thermal and/or elastic properties of the lithosphere (see Czechowski 2018). Methods based on Eqs.…”

Section: Local Isostasymentioning

confidence: 99%

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Mantle Flow and Determining Position of LAB Assuming Isostasy

Czechowski

2019

Pure Appl. Geophys.

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“…Moreover, we investigated the role of assumption about the steady state temperature distribution for the continental lithosphere. For this purpose, we use some of the options offered by LABWA2015 package - Czechowski (2018).…”

Section: Introductionmentioning

confidence: 99%

Isostasy, LAB and some properties of asthenosphere in chosen regions of Poland

Czechowski¹

2019

Preprint

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We use programs from the package LABWA2015 to determine position of Lithosphere-Asthenosphere Boundary (LAB) and some properties of lower lithosphere in chosen sites in Poland. Seismic, topographic, thermal and petrological data are used together with assumption about isostasy. Moreover we investigate the role of assumption about the steady state temperature distribution. We have found that sometimes this assumption for continental lithosphere can be unjustified but usually does not lead to significant errors. We have found also that in chosen sites, the thermal LAB is in the depth range 85-95 km. The average value of thermal conductivity of mantle is ~4 W m-1 K-1. Just below MOHO, a level of approximate isostatic compensation is found. More precise compensation is found in the asthenosphere at ~110 km but its position is sensitive to the density distribution.

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Determination of the Lithosphere-Asthenosphere Boundary using program LABWA2015

Cited by 2 publications

References 10 publications

Mantle Flow and Determining Position of LAB Assuming Isostasy

Mantle Flow and Determining Position of LAB Assuming Isostasy

Isostasy, LAB and some properties of asthenosphere in chosen regions of Poland

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