Bedding control on landslides: a methodological approach for computer-aided mapping analysis

Abstract

Abstract. Litho-structural control on the spatial and temporal evolution of landslides is one of the major typical aspects on slopes constituted of structurally complex sequences. Mainly focused on instabilities of the earth flow type, a semi-quantitative analysis has been developed with the purpose of identifying and characterizing litho-structural control exerted by bedding on slopes and its effects on landsliding. In quantitative terms, a technique for azimuth data interpolation, Non-continuous Azimuth Distribution Methodological Approach (NADIA), is presented by means of a GIS software application. In addition, processed by NADIA, two indexes have been determined: (i) , aimed at defining the relationship between the orientation of geological bedding planes and slope aspect, and (ii) C, which recognizes localized slope sectors in which the stony component of structurally complex formations is abundant and therefore operates an evolutive control of landslide masses. Furthermore, some Litho-Structural Models (LSMs) of slopes are proposed aiming at characterizing recurrent forms of structural control in the source, channel and deposition areas of gravitational movements. In order to elaborate evolutive models controlling landslide scenarios, LSMs were qualitatively related and compared with and C quantitative indexes. The methodological procedure has been applied to a lithostructurally complex area of Southern Italy where data about azimuth measurements and landslide mapping were known. It was found that the proposed methodology enables the recognition of typical control conditions on landslides in relation to the LSMs. Different control patterns on landslide shape and on style and distribution of the activity resulted for each LSM. This provides the possibility for first-order identification to be made of the spatial evolution of landslide bodies.

An approach to reduce mapping errors in the production of landslide inventory maps

“…LIMs are also used to determine the statistics of landslide size (area and volume) (Malamud et al, 2004a;, and to investigate correlations between the location and abundance of landslides and the local geological structure (Grelle et al, 2011;Marchesini et al, 2013;Santangelo et al, 2015b). Our results revealed that the geographical accuracy of the location (and hence the shape and size) of the landslides depends on the size of the slope failures (Fig.…”

“…Based on our experience, and the production of LIMs for more than 4 ×10 5 km 2 in different physiographical and climatic settings in Italy (Antonini et al, 1993(Antonini et al, , 2002bArdizzone et al, 2012;Cardinali et al, 2001;Guzzetti and Cardinali, 1989;Santangelo et al, 2015a), and elsewhere in the world (e.g. , we identify three main steps for the production of a LIM (Fig.…”

Analisis Kestabilan Lereng Batu Di Jalan Raya Lhoknga Km 17,8 Kabupaten Aceh Besar

“…Dalam metode kinematik analisis, pengaruh struktur geologi berupa bidang diskontinuitas berupa perlapisan, kekar, lipatan, rekahan dan patahan akan dianalisis secara seksama. Aspek struktur geologi bidang diskontinuitas ini sangat mempengaruhi tingkat kestabilan lereng batuan (Rusydy, et al, 2016;Grelle, et al, 2011;Wyllie & Mah, 2004). Berdasarkan hasil analisis kinematik lereng ini, nantinya akan dapat diperkirakan sebuah lereng stabil atau tidak.…”

Application of paleostress analysis for the identification of potential instability precursors within the Benue Trough Nigeria

“…The understanding of the stress orientation will improve the knowledge of deformation mechanisms, which is crucial for the implementation of a viable monitoring system. Irfan (1999), Revellino et al (2010), Grelle et al (2011), Aucelli et al (2013), Prakash et al (2015) have reported structurally-controlled landslides. Investigation of the landslides revealed that the geo-structural settings predisposed the slopes to factors triggering mass movements, which is consistent with Fookes and Wilson (1966), Zaruba andMencl (1969), andVarnes (1978).…”