  Intermediate mass black holes (IMBHs) with a mass between $10^{2}$ and
$10^{5}$ times that of the sun, which bridges the {mass gap between the}
stellar-mass black holes and the supermassive black holes, are crucial in
understanding the evolution of the black holes. Although they are widely
believed to exist, decisive evidence has long been absent. Motivated by the
successful detection of massive stellar-mass black holes by advanced LIGO,
through the gravitational wave radiation during the binary merger, in this work
we investigate the prospect of detecting/identifying the lightest IMBHs
(LIMBHs; the black holes $\gtrsim 100M_\odot$) with the second generation
gravitational wave detectors. In general, the chance of hearing the birth of
the LIMBHs is significantly higher than that to identify pre-merger IMBHs. The
other formation channel of LIMBHs, where stars with huge mass/low-metallicity
directly collapse, is likely "silent", so the merger-driven birth of the LIMBHs
may be the only "observable" scenario in the near future. Moreover, the
prospect of establishing the presence of (lightest) intermediate mass black
holes in the O3 run and beyond of advanced LIGO is found quite promising,
implying that such an instrument could make another breakthrough on astronomy
in the near future. The joining of other detectors like advanced Virgo would
only increase the detection rate.
