Fig. 3: Seismicity located during 23–24 March and 5–6 April VT swarms.

a Epicentres calculated showing concentric distribution. b Temporal evolution of depths during 23–24 March, most seismicity is shallower than 5 km. c Temporal evolution of depths during 5–6 April, seismicity is shallower than 5 km until 18:00 UTC on 5 April, when locations transitioned to deeper levels.