Fig 1.
Possible dyadic and triadic motifs of an undirected network.
The upper panel includes the two types of dyadic motifs: no-link dyads and one-link dyads; the lower panel lists the four types of triadic motifs: no-link triads, one-link triads, two-link triads and three-link triads. In this study, only no-link dyads, one-link dyads, two-link triads and three-link triads are considered.
Fig 2.
Temporal trajectory of dyadic motifs.
The z score of a dyad measures the deviation of the number of this dyad from its expected number predicted by the null models. Its magnitude indicates the importance of a dyad in determining the structure of the online-social-interaction network.
Fig 3.
Temporal trajectories of triadic motifs.
(a) shows the change of the z scores over time for the number of two-link triads and three-link triads respectively. (b) shows the everyday deviation of the z score from the average pre-impact z score. The deviation reflects the difference in online-social-interaction patterns on a particular day from pre-impact patterns.
Fig 4.
Temporal evolution of infrastructure networks.
The z score indicates deviation from regular human mobility patterns (assumed to be the pre-impact patterns), a metric of infrastructure performance.