Fig. 1

An overview map of the researched area showing the positions of the seismic sensors (dots) and mapped maar features (modified after Mrlina et al. 2009). Two array configurations are shown (green dots: Array 1—lacustrine sediments; blue dots: Array 2—volcanic breccia). Maar features as presented by Mrlina et al. (2009): (1) approximate contour of the lacustrine sediments; (2) centre of maar diatreme; (3) volcanic breccia; (4) erupted magnetic rocks accumulations; (5) relicts of tephra rim outside the crater; (6) morphological edge of the crater; (7) MY-1 borehole; (8) mapped faults of the Tachov fault zone (Flechsig et al. 2015). The positions of the consecutive double-station measurements are indicated by cyan dots. The positions of the reference stations at the southern edge of the crater are shown by purple dots. The black solid cross indicates the two dominant directions of the resonance (discussed later in the results section). The coordinates are given in m of WGS84 UTM projection in the 33N zone. The inset map (top right) displays the position of the Mýtina maar (red square) in a regional context, whilst the inset photo (bottom right) shows the typical field installation