# Assessing the fracture occurrence using the "Weighted fracturing density": A step towards estimating rock instability hazard

### Details

Serval ID

serval:BIB_7FB14E02D395

Type

**Article**: article from journal or magazin.

Collection

Publications

Fund

Title

Assessing the fracture occurrence using the "Weighted fracturing density": A step towards estimating rock instability hazard

Journal

Natural Hazards and Earth System Science

ISSN-L

1561-8633

Publication state

Published

Issued date

2004

Peer-reviewed

Oui

Volume

4

Pages

83-93

Language

english

Abstract

Based on the assumption that major class of rock instabilities are

created by discontinuities, a method is proposed to estimate the

fracture density by means of a digital elevation model (DEM). By

using the mean orientation, the mean spacing and the mean trace length

of discontinuity sets potentially involved in slope instabilities

and a DEM, it is possible to calculate the mean number of discontinuities

of a given set per cell of the DEM. This would allow for an estimation

of the probability of the presence of at least one discontinuity

in a given area or simply in a topographic cell of the DEM. This

analysis highlights sites potentially affected by rockslides within

a region. Depending on the available data, the mean number can be

calculated either by area, or along a line parallel to the mean apparent

spacing. The effective use of the probability of occurrence is dependent

on the size of the discontinuities because short and closely spaced

discontinuities will have a 100% probability of occurrence in each

favorable location. The a posteriori prediction of a recent rockslide

is discussed as an example.

created by discontinuities, a method is proposed to estimate the

fracture density by means of a digital elevation model (DEM). By

using the mean orientation, the mean spacing and the mean trace length

of discontinuity sets potentially involved in slope instabilities

and a DEM, it is possible to calculate the mean number of discontinuities

of a given set per cell of the DEM. This would allow for an estimation

of the probability of the presence of at least one discontinuity

in a given area or simply in a topographic cell of the DEM. This

analysis highlights sites potentially affected by rockslides within

a region. Depending on the available data, the mean number can be

calculated either by area, or along a line parallel to the mean apparent

spacing. The effective use of the probability of occurrence is dependent

on the size of the discontinuities because short and closely spaced

discontinuities will have a 100% probability of occurrence in each

favorable location. The a posteriori prediction of a recent rockslide

is discussed as an example.

Keywords

geometry, length, traces

Create date

25/11/2013 19:41

Last modification date

18/11/2016 14:22