**3.2 MICMAC analysis: classification of CPT-based seismic soil liquefaction significant factors**

The driving power and dependency power of each variable was measured using the final reachability matrix to analyze the strength of the relationship between seismic soil liquefaction significant factors. Driving power is characterized as an activity that propels other activities, while dependency power is defined as an activity that is driven by other activities. The driving power and dependency power are determined from the final reachability matrix by adding the sum of all '1's in that factor's corresponding row and column.

This is considered as an input to build a graph to classify the factors into four clusters i.e., Autonomous, Dependent, Linkage, and Independent factors (see **Figure 2**). Autonomous factors (first cluster) have weak driving power and weak dependence power. Dependent factors (second cluster) have weak driving power and strong dependence power. Linkage factors (third cluster) have strong driving power and strong dependence power. In the dependent factors (fourth cluster) acquires strong driving power and weak dependence power. The soil liquefaction factors have been categorized based on these aforementioned clusters. The four clusters of soil liquefaction factors are:

#### *3.2.1 Cluster I: autonomous factors*

Cluster I, represents autonomous factors and consists of soil liquefaction factors which have weak driving power and dependence power. This cluster has six seismic soil liquefaction factors (55%). Cluster I factors are relatively disconnected from the system. Autonomous factors in cluster I are earthquake magnitude F1 (*M*), closest distance to rupture surface F3 (*R*/*rrup*), fines content F4 (*FC*), vertical effective stress F7 (*σ*<sup>0</sup> *<sup>v</sup>*), groundwater table F9 (*Dw*), and thickness of soil layer F11 (*Ts*).

*Elucidation of Seismic Soil Liquefaction Significant Factors DOI: http://dx.doi.org/10.5772/intechopen.97278*


**Figure 2.** *MICMAC Analysis of seismic soil liquefaction factors.*
