This electronic supplement contains additional figures and animations that are meant to show the actual operations of LastQuake during the Ghorka, Nepal, earthquake and its main aftershock and how each felt earthquake led to additional LastQuake smartphone application installations.
Figure S1 a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, and y. Tweets published within the first 90 minutes following the 25 April M 7.8 Nepal earthquake. All 42 tweets were automatic. They concern the mainshock and five felt aftershocks and contain three erroneous flashsourced detections (Figs. S1_k, S1_p, S1_q), one being automatically disregarded (Fig. S1_q). The numbers of views and retweets (square with arrows) indicated for each tweet is determined by Twitter at the time of the study. Time is expressed in minutes from the M 7.8 occurrence.
Figure S2 a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, aa, bb, cc, dd, ee, ff, gg, hh, ii, and jj. Tweets published within the first 90 minutes following the 12 May M 7.3 Nepal earthquake. There were 41 automatic and 14 manual tweets (Figs. S2_f, S2_i, S2_k, S2_n, S2_p, S2_r, S2_t, S2_z, S2_bb, S2_ee, S2_ii). They concern the M 7.3 shock and six of its aftershocks. See caption for Figure S1.
Animation S1 [H.264-encoded MP4 Video; ~1 MB]. Geographic origins of the European Mediterranean Seismological Centre (EMSC) website visitors after the M 7.8 Nepal earthquake. Red circles represent geographic origins of statistically significant increased traffic. Black triangles represent the observed geographic origins of website visitors in the past 12 months. This characterizes the maximum spatial resolution of the Internet Protocol (IP) locations. Circle size is a function of the difference between the expected and the observed numbers of unique IPs. The star represents the epicenter location. IP locations are determined by Digital Element geolocation (http://www.digitalelement.com/, last accessed September 2015).
Animation S2 [H.264-encoded MP4 Video; ~13.8 MB]. Time evolution of the number of LastQuake applications in operation within 1500 km of the M 7.8 Nepal earthquake. The time step is three hours. Stars represent the earthquakes occurring within the time step and detected as felt by the EMSC. New application installations appear in red.
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