Molina, I., H. Kumagai, and H. Yepes, Resonances of a volcanic conduit
triggered by repetitive injections of an ash-laden gas,
Geophys. Res. Lett., 31, L03603, doi:10.129/2003GL018934, 2004
Nakano, M., H. Kumagai, and B.A. Chouet, Source mechanism of
long-period events at Kusatsu-Shirane Volcano, Japan, inferred from
waveform inversion of the effective excitation functions,
J. Volcanol. Geotherm. Res., 122, 149-164, 2003
Kumagai, H., K. Miyakawa, H. Negishi, H. Inoue, K. Obara, and
D. Suetsugu, Magmatic dike resonances inferred from very-long-period
seismic signals, Science, 299, 2058-2061 (10.1126/science.1081195),
2003
Kumagai, H., B.A. Chouet, and M. Nakano, Waveform inversion of
oscillatory signatures in long-period events beneath volcanoes,
J. Geophys. Res., 107, 2301, doi:10.1029/2001JB001704, 2002
Kumagai, H., B.A. Chouet, and M. Nakano, Temporal evolution of a
hydrothermal system in Kusatsu-Shirane Volcano, Japan, inferred from
the complex frequencies of long-period events, J. Geophys. Res., 107,
2236, doi:10.1029/2001JB000653, 2002
Kumagai, H. and B.A. Chouet, The dependence of acoustic properties of
a crack on the resonance mode and geometry, Geophys. Res. Lett., 28,
3325-3328, 2001
Kumagai, H., T. Ohminato, M. Nakano, M. Ooi, A. Kubo, H. Inoue, and
J. Oikawa, Very-long-period seismic signals and the caldera formation
at Miyake Island, Japan, Science, 293, 687-690, 2001
Tomatsu, T., H. Kumagai and P.B. Dawson, Tomographic inversion of
P-wave velocity and Q structures beneath the Kirishima volcanic
complex, southern Japan, based on the finite-difference calculations
of the complex travel times, Geophys. J. Int., 146, 781-794, 2001
Hasada, Y., H. Kumagai and M. Kumazawa, Autoregressive modeling of
transfer functions in frequency domain to determine complex travel
times, Earth Planets Space, 53, 3-11, 2001
Kumagai, H. and B.A. Chouet, Acoustic properties of a crack containing
magmatic or hydrothermal fluids, J. Geophys. Res., 105, 25,493-25,512,
2000
Kumagai, H., Y. Fukao, S. Watanabe and Y. Baba, A self-organized model
of earthquakes with constant stress drops and the b-value of 1,
Geophys. Res. Lett. 26, 2817-2820, 1999
Kumagai, H. and B.A. Chouet, The complex frequencies of long-period
seismic events as probes of fluid compositions beneath volcanoes,
Geophys. J. Int. 138, F7-F12, 1999
Takai, K., H. Kumagai and N. Fujii, Evidence for slow slip following a
moderate-size earthquake (Mw=5.7) in a subducting plate,
Geophys. Res. Lett., 26, 2113-2116, 1999
Nakano, M., H. Kumagai, M. Kumazawa, K. Yamaoka and B.A. Chouet, The
excitation and characteristic frequency of the long-period volcanic
event: an approach based on an inhomogeneous AR model of a linear
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