eprintid: 212 rev_number: 22 eprint_status: archive userid: 2 dir: disk0/00/00/02/12 datestamp: 2015-02-10 10:21:52 lastmod: 2020-03-24 08:36:29 status_changed: 2015-04-27 07:27:39 type: article metadata_visibility: show creators_name: Baiesi, Marco creators_name: Paczuski, Maya creators_id: creators_id: maya@ic.ac.uk corp_creators: INFM–Dipartimento di Fisica, Università di Padova, I-35131 Padova, Italy corp_creators: Mathematical Physics, Department of Mathematics, Imperial College London, London SW7 2BZ, United Kingdom title: Scale-free networks of earthquakes and aftershocks ispublished: pub subjects: MP2_3 divisions: EPOS-P full_text_status: none abstract: We propose a metric to quantify correlations between earthquakes. The metric consists of a product involving the time interval and spatial distance between two events, as well as the magnitude of the first one. According to this metric, events typically are strongly correlated to only one or a few preceding ones. Thus a classification of events as foreshocks, main shocks, or aftershocks emerges automatically without imposing predetermined space-time windows. In the simplest network construction, each earthquake receives an incoming link from its most correlated predecessor. The number of aftershocks for any event, identified by its outgoing links, is found to be scale free with exponent γ=2.0(1). The original Omori law with p=1 emerges as a robust feature of seismicity, holding up to years even for aftershock sequences initiated by intermediate magnitude events. The broad distribution of distances between earthquakes and their linked aftershocks sug- gests that aftershock collection with fixed space windows is not appropriate. date: 2004 date_type: published publication: Physical Review E volume: 69 number: 6 publisher: The American Physical Society id_number: doi:10.1103/PhysRevE.69.066106 refereed: TRUE issn: 1539-3755 official_url: http://dx.doi.org/10.1103/PhysRevE.69.066106 access_IS-EPOS: unlimited owner: Publisher citation: Baiesi, Marco and Paczuski, Maya (2004) Scale-free networks of earthquakes and aftershocks. Physical Review E, 69 (6). DOI: https://doi.org/10.1103/PhysRevE.69.066106 <https://doi.org/10.1103/PhysRevE.69.066106>