Fig. 2From: Multi-index method using offshore ocean-bottom pressure data for real-time tsunami forecastRelations between the three indices [two variance reductions, \(\hbox {VRO}(t)\) and \(\hbox {VRC}(t)\), and correlation coefficient \(\hbox {R}(t)\)] and the ratio \(\alpha (t)\) in \(\hbox {VRO}(t)\)–\(\hbox {VRC}(t)\) diagram. All possible pairs of all scenarios are restricted to the region between the curves of \(\hbox {R}(t) = 1.0\) and \(\hbox {R}(t) =-1.0\) Back to article page