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Abstract
Social networks provide a basis for collective resilience to disasters. Combining the quasi-experimental context of a major earthquake in Ya'an, China, with anonymized mobile telecommunications records regarding 91,839 Ya'an residents, we use initial bursts of postdisaster communications (e.g. choice of alter, order of calls, and latency) to reveal the "important ties"that form the social network backbone. We find that only 26.8% of important ties activated during the earthquake were the strongest ties during normal times. Many important ties were hitherto latent and weak, only to become persistent and strong after the earthquake. We show that which ties activated during a sudden disaster are best predicted by the interaction of embeddedness and tie strength. Moreover, a backbone of important ties alone (without the inclusion of weak ties ordinarily seen as important to bridge communities) is sufficient to generate a hierarchical structure of social networks that connect a disaster zone's disparate communities.
Original language | English |
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Article number | pgad358 |
Journal | PNAS Nexus |
Volume | 2 |
Issue number | 11 |
Early online date | 2 Nov 2023 |
DOIs | |
Publication status | Published - Nov 2023 |
Bibliographical note
© The Author(s) 2023. Published by Oxford University Press on behalf of National Academy of Sciences.Funding
J.S.J. is supported by the Research Grants Council of Hong Kong (C7105-20G, 14505217, and 17506316). J.J. is supported by the National Natural Science Foundation of China (72074072, 72042009, and 72332004) and the Guangdong Provincial Key Laboratory of Future Networks of Intelligence (grant no. 2022B1212010001). Y.L. is supported by the Research Grants Council of Hong Kong (13503323) and the Lam Woo Research Fund at Lingnan University (LWP20020).
Keywords
- earthquake disaster
- quasi-experiment
- social network activation
- structural embeddedness
- tie strength
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