On the isostatic gravity anomaly and disturbance and their applications to vening meinesz-moritz gravimetric inverse problem

• In this study,we showthat the traditionally defined Bouguer gravity anomaly needs a correction to become 'the no-topography gravity anomaly' and that the isostatic gravity anomaly is better defined by the latter anomaly plus a gravity anomaly compensation effect than by the Bouguer gravity anomaly plus a gravitational compensation effect. This is because only the newisostatic gravity anomaly completely removes and compensates for the topographic effect. F. A. Vening Meinesz' inverse problem in isostasy deals with solving for the Moho depth from the known external gravity field and mean Moho depth (known, e.g. from seismic reflection data) by a regional isostatic compensation using a flat Earth approximation. H. Moritz generalized the problem to that of a global compensation with a spherical mean Earth approximation. The problem can be formulated mathematically as that of solving a non-linear Fredholm integral equation. The solutions to these problems are based on the condition of isostatic balance of the isostatic gravity anomaly, and, theoretically, this assumption cannot be met by the old definition of the isostatic gravity anomaly. We show how the Moho geometry can be solved for the gravity anomaly, gravity disturbance and disturbing potential, etc., and, from a theoretical point of view, all these solutions are the same.

Ämnesord

NATURVETENSKAP  -- Geovetenskap och miljövetenskap (hsv//swe)

NATURAL SCIENCES  -- Earth and Related Environmental Sciences (hsv//eng)

Nyckelord

Composition of the continental crust.

Geopotential theory

Gravity anomalies and earth structure

Bouguer gravity anomalies

Compensation effects

Composition of the continental crusts

Fredholm integral equations

Geopotential theories

Gravity anomalies and Earth structures

Isostatic compensation

Seismic reflection data

Gravitation

Inverse problems

Tectonics

Bouguer anomaly

continental crust

Earth structure

geopotential

gravity anomaly

gravity field

inverse problem

Moho

topographic effect

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)