Anisotropy of magnetic susceptibility analysis of deformed kaolinite: implications for evaluating landslides

Abstract

Plane strain tests were performed on seven kaolinite blocks, each of which developed shear bands. Anisotropy of magnetic susceptibility (AMS) analysis of the kaolinite reveals a threshold degree of magnetic anisotropy (P 0 ) exceeding which shear bands develop. Since P 0 is a strain-intensity gauge and soils are known to develop shear bands prior to landsliding, it is concluded that soil in every landslide-prone region must have its unique threshold P 0 exceeding which it develops shear bands before failing. Therefore, AMS monitoring of soil in landslide prone regions is proposed as a potential tool in the management of natural hazard zones.

Structural and magnetic fabric studies of recess structures in the western Himalaya: Implications for 1905 Kangra earthquake

“…Figure 3 (Pj vs. K m plot) shows absence of one-to-one correlation between the two parameters. Hence P j and AMS fabric can be correlated with strain (Borradaile, 1987;Pares and van der Pluijm, 2002; Mukherji et al 2004;Sen et al 2005;Majumder and Mamtani, 2009;Mamtani and Sengupta, 2009). …”

Distinctive diamagnetic fabrics in dolostones evolved at fault cores, the Dead Sea Transform

“…In most deformed environments, the directions of the AMS axes show a fair to good correlation with the directions of the principal (finite) strain axes (e.g., Borradaile, 1987Borradaile, , 1988Borradaile, , 1991Tarling and Hrouda, 1993;Borradaile and Henry, 1997;Par es et al, 1999;Latta and Anastasio, 2007;Soto et al, 2007;Mamtani and Sengupta, 2009;Hrouda et al, 2009;Burmeister et al, 2009;Hirt and Almqvist, 2012). No reliable correlation has been established between the magnitudes of the AMS axes and those of strain magnitudes (e.g., Par es and Van der Pluijm, 2004;Latta and Anastasio, 2007;Borradaile and Jackson, 2010) mainly because these relationships are complex, and may be governed by the percentage of the Fe and Mn-minerals in the rock (Rochette, 1988;Borradaile and Henry, 1997;Schmidt et al, 2006).…”

Fabric Analysis in Upper Crustal Post-Collisional Granitoids from the Serre Batholith (Southern Italy): Results from Microstructural and AMS Investigations

“…In particular, the above authors estimated the lowest X/Z ratio of the fabric ellipsoid for the upper crustal Santa Caterina granodiorites (BAG, depth c. 6 km) to be equal to 1.31, much lower than the value of 2.13 obtained for the deepest granitoids (Squillace tonalites, depth c. 23 km). The degree of magnetic anisotropy (Pj) is a gauge of the eccentricity of the AMS ellipsoid, and in several previous studies this has been considered as a strain intensity gauge (although not a measure of absolute strain [119][120][121]). In the present investigation, it is noted that Pj for the two granitoid units (BAG and MBG) is low and varies between 1.016-1.042 in the BAG and 1.012-1.112 in the MBG (Table 1).…”