last modified: 19 December, 2023

Akihiko Yokoo,
Associate Professor

Aso Volcanological Laboratory, Institute for Geothermal Science,
Graduate School of Science, Kyoto University
Kawayo, Minami-Aso, Kumamoto, 869-1404 Japan
TEL +81 967 67 0022; FAX +81 967 67 2153
e-mail: yokoo.akihiko.5a/at/kyoto-u.ac.jp

CURRENT RESEARCH

CURRICULUM VITAE

LIST OF PUBLICATIONS (click each check-box to open/close)

  1. Narita, S., Yokoo, A., Ohkura, T., Morita, M., Mori, T., and Yoshikawa, S., Heat transport process associated with the 2021 eruption of Aso volcano revealed by thermal and gas monitoring, Earth, Planets and Space, submitted in November 2023.
    1. Muramatsu, D., Aizawa, K., Yokoo, A., Tameguri, T., and Iguchi, M. (2023) Vulcanian eruption processes inferred from volcanic glow analysis at Sakurajima volcano, Japan, Bulletin of Volcanology, 85, 41, 10.1007/s00445-023-01656-x
    2. Nashimoto, S. and Yokoo, A. (2023) A new method to reconstruct the 3D ground surface temperature from aerial TIR and visible images: Application to the active crater of Aso volcano, Japan, Earth, Planets and Space, 75, 57, 10.1186/s40623-023-01786-8
    3. Ishii, K., Yokoo, A., Ohkura, T., and Kazama, T.(2023) Temporal variation in the depth of the magma surface at Aso volcano in 2014-2015, Bulletin of Volcanology, 85, 7, 10.1007/s00445-022-01616-x
    1. Tsunogai, U., Shingubara, R., Morishita, Y. Ito, M., Nakagawa, F., Yoshikawa, S., Utsugi, M., and Yokoo, A. (2022) Sampling volcanic plume using a drone-borne SelPS for remotely determined stable isotopic compositions of fumarolic carbon dioxide, Frontiers in Earth Science, 10, 833733, 10.3389/feart.2022.833733
    1. Ishii, K. and Yokoo, A. (2021) Combined approach to estimate the depth of the magma surface in a shallow conduit at Aso volcano, Japan, Earth, Planets and Space, 73, 187, 10.1186/s40623-021-01523-z
    2. Yokoo, A. and Ishii, K. (2021) Process to analyze radiometric JPEG files taken by a thermal infrared camera (in Japanese), Bulletin of Volcanological Society of Japan, 66, 229-240, 10.18940/kazan.66.3_229
    3. Shingubara, R., Tsunogai, U., Ito, M., Nakagawa, F., Yoshikawa, S., Utsugi, M., and Yokoo, A. (2021) Development of a drone-borne volcanic plume sampler, Journal of Volcanology and Geothermal Research, 412, 107197, 10.1016/j.jvolgeores.2021.107197
    1. Ishii, K., Yokoo, A., Iguchi, M., and Fujita, E. (2020) Utilizing the solution of sound diffraction by a thin screen to evaluate infrasound waves attenuated by volcano topography, Journal of Volcanology and Geothermal Research, 402, 106983, 10.1016/j.jvolgeores.2020.106983
    2. Maher, S., Matoza, R., de Groot-Hedlin, C., Gee, K., Fee, D., and Yokoo, A. (2020) Investigating spectral distortion of local volcano infrasound by nonlinear propagation at Sakurajima volcano, Japan, Journal of Geophysical Research, 125, e2019JB018284, 10.1029/2019JB018284
    1. Tsunematsu, K., Ishii, K., and Yokoo, A. (2019) Transport of ballistic projectiles during the 2015 Aso Strombolian eruptions, Earth, Planets and Space, 71, 49, 10.1186/s40623-019-1029-3
    2. Ishii, K., Yokoo, A., Kagiyama, T., Ohkura, T., Yoshikawa, S., and Inoue, H. (2019) Gas flow dynamics in the conduit of Strombolian explosion inferred from seismo-acoustic observation at Aso volcano, Japan, Earth, Planets and Space, 71, 13, 10.1186/s40623-019-0992-z
    3. Yokoo, A., Ishii, K., Ohkura, T., and Kim, K. (2019) Monochromatic infrasound waves observed during the 2014-2015 eruption of Aso volcano, Japan, Earth, Planets and Space, 71, 12, 10.1186/s40623-019-0993-y
    4. Morita, M., Mori, T., Yokoo, A., Ohkura, T., and Morita, Y. (2019) Continuous monitoring of soil CO2 flux at Aso volcano, Japan: The influence of environmental parameters on diffuse degassing, Earth, Planets and Space, 71, 1, 10.1186/s40623-018-0980-8
    1. Muramatsu, D., Aizawa, K., Yokoo, A., Iguchi, M., and Tameguri, T. (2018) Estimation of vent radii from video recordings and infrasound data analysis: Implications for Vulcanian eruptions from Sakurajima volcano, Japan, Geophysical Research Letters, 45, 12,829-12,836, 10.1029/2018GL079898
    2. Shinohara, H., Yokoo, A., and Kazahaya, R. (2018) Variation of volcanic gas composition during the eruptive period in 2014-2015 at Nakadake crater, Aso volcano, Japan, Earth, Planets and Space, 70, 151, 10.1186/s40623-018-0919-0
    3. Ichimura, M., Yokoo, A., Kagiyama, T., Yoshikawa, S., and Inoue, H. (2018) Temporal variation in source location of continuous tremor before the ash-gas emissions in January 2014 at Aso volcano, Japan, Earth, Planets and Space, 70, 125, 10.1186/s40623-018-0895-4
    4. Cigolini, C., Coppola, D., Yokoo, A., and Laiolo, M. (2018) The thermal signature of Aso Volcano during unrest episodes detected from space and ground-based measurements, Earth, Planets and Space, 70, 67, 10.1186/s40623-018-0831-7
    5. Shinohara, H., Geshi, N., Yokoo, A., Ohkura, T., and Terada, A. (2018) Salt shell fallout during the ash eruption at the Nakadake crater, Aso volcano, Japan: evidence of an undergrounds hydrothermal system surrounding the erupting vent, Earth, Planets and Space, 70, 46, 10.1186/s40623-018-0798-4
    6. Miyabuchi, Y., Ishizuka, Y., Hara, C., Yokoo, A., and Ohkura, T. (2018) The September 14, 2015 phreatomagmatic eruption of Nakadake first crater, Aso Volcano, Japan: Eruption sequence inferred from ballistic, pyroclastic density current and fallout deposits, Journal of Volcanological and Geothermal Research, 351, 41-56, 10.1016/j.jvolgeores.2017.12.009
    1. Tournigand, P.Y., Taddeucci, J., Gaudin, D., Fernandez, J.J.P., Del Bello, E., Scarlato, P., Kueppers, U., Sesterhenn, J., and Yokoo, A. (2017) The initial development of transient volcanic plumes as a function of source conditions, Journal of Geophysical Research, 122, 9784-9803, 10.1002/2017JB014907
    2. Fee, D., Izbekov, P., Kim, K., Yokoo, A., Lopez, T., Prata, F., Kazahaya, R., Nakamichi, H., and Iguchi, M. (2017) Eruption mass estimation using infrasound waveform inversion and ash and gas measurements: Evaluation at Sakurajima Volcano, Japan, Earth and Planetary Science Letters, 480, 42-52, 10.1016/j.epsl.2017.09.043
    3. Yamamoto, K., Ohkura, T., Yokoo, A., Tameguri, T., Sonoda, T., and Inoue, H. (2017) Vertical ground deformation related with the 2014 and 2015 eruptions at Kuchierabujima volcano, Japan detected by repeated precise leveling surveys, Journal of Natural Disaster Science, 38, 133-144, 10.2328/jnds.38.133
    4. McKee, K., Fee, D., Yokoo, A., Matoza, R., and Kim, K. (2017) Analysis of gas jetting and fumarole acoustics at Aso Volcano, Japan, Journal of Volcanology and Geothermal Research, 340, 16-29, 10.1016/j.jvolgeores.2017.03.029
    1. Kazahaya, R., Shinohara, H., Mori, T., Iguchi, M., and Yokoo, A. (2016) Pre-eruptive inflation caused by gas accumulation: Insight from detailed gas flux variation at Sakurajima volcano, Japan, Geophysical Research Letters, 43, 11,219-11,225, 10.1002/2016GL070727
    2. Aizawa, K., Cimarelli, C., Alatorre-Igbargüengoitia, M.A., Yokoo, A., Dingwell, D.B., and Iguchi, M. (2016) Physical properties of volcanic lightning: constraints from magnetotelluric and video observations at Sakurajima volcano, Japan, Earth and Planetary Science Letters, 444, 45-55, 10.1016/j.epsl.2016.03.024
    3. Cimarelli, C., Alatorre-Igbargüengoitia, M.A., Aizawa, K., Yokoo, A., Díaz-Marina, A., Iguchi, M., and Dingwell, D.B. (2016) Multiparametric observation of volcanic lightning: Sakurajima volcano, Japan, Geophysical Research Letters, 43, 4221-4228, 10.1002/2015GL067445
    1. Kim, K., Fee, D., Yokoo, A., and Johnathan, M.L. (2015) Acoustic source inversion to estimate volume flux from volcanic explosions, Geophysical Research Letters, 42, 5243-5249, 10.1002/2015GL064466
    2. Yokoo, A. and Miyabuchi, Y. (2015) Eruption at the Nakadake 1st crater of Aso Volcano started in November 2014 (in Japanese), Bulletin of Volcanological Society of Japan, 60, 275-278, 10.18940/kazan.60.2_275
    1. Fee, D., Yokoo, A., and Johnson, J.B. (2014) Introduction to an open communitiy infrasound dataset from the actively erupting Sakurajima Volcano, Japan, Seismological Research Letter, 85, 1151-1162, 10.1785/0220140051
    2. McKee, K., Fee, D., Rowell, C., and Yokoo, A. (2014) Network-based evaluation of the infrasonic source location at Sakurajima Volcano, Seismological Research Letter, 85, 1200-1211, 10.1785/0220140119
    3. Yokoo, A., Suzuki, Y.J., and Iguchi, M. (2014) Dual infrasound sources from a Vulcanian eruption of Sakurajima volcano, inferred from cross-array observation, Seismological Research Letter, 85, 1212-1222, 10.1785/0220140047
    4. Suwa, H., Suzuki, Y.J., and Yokoo, A. (2014) Estimation of exit velocity of volcanic plume from analysis of vortex structures, Earth and Planetary Science Letters, 385C, 154-161, 10.1016/j.epsl.2013.10.032
    1. Shimano, T., Nishimura, T., Chiga, N., Yoshibasaki, Y., Iguchi, M., Miki, D., and Yokoo, A. (2013) Development of automatic volcanic ash sampling apparatus at active volcanoes, Bulletin of Volcanology, 73, 773, 10.1007/s00445-013-0773-7
    2. Ichihara, M., Lyons, J.J., and Yokoo, A. (2013) Switching from seismic to seismo-acoustic harmonic tremor at a transition of eruptive activity during the Shinmoe-dake 2011 eruption, Earth, Planets, and Space, 65, 633-653, 10.5047/eps.2013.05.003
    3. Yokoo, A., Iguchi, M., Tameguri, T. and Yamamaoto, K. (2013) Processes prior to outburst of Vulcanian eruption at Showa crater of Sakurajima volcano, Bulletin of Volcanological Society of Japan, 58, 163-181, 10.18940/kazan.58.1_163
    1. Ichihara, M., Takeo, M., Yokoo, A., Oikawa, J. and Ohminato, T. (2012) Monitoring volcanic activities using correlation patterns between infrasound and ground motion, Geophysical Research Letters, 39, L04304, 10.1029/2011GL050542
    1. Aizawa, K., Kanda, W., Ogawa, Y., Iguchi, M., Yokoo, A., Yakiwara, H. and Sugano, T. (2011) Temporal changes in electrical resistivity at Sakurajima volcano from continuous magnetotelluric observations: Possible indication of lateral magma degassing, Journal of Volcanology and Geothermal Research, 199, 165-175, 10.1016/j.jvolgeores.2010.11.003
    1. Yokoo, A. and Iguchi, M. (2010) Using infrasound waves from eruption video to explain ground deformation preceding the eruption of Suwanosejima volcano, Japan, Journal of Volcanology and Geothermal Research, 196, 287-294, 10.1016/j.jvolgeores.2010.08.008
    2. Aizawa, K., Yokoo, A., Kanda, W., Ogawa, Y. and Iguchi, M. (2010) Magnetotelluric pulses generated by volcanic lightning at Sakurajima volcano, Japan, Geophysical Research Letters, 37, L17301, 10.1029/2010GL044208
    1. Yokoo, A. (2009) Continuous thermal monitoring of the 2008 eruptions at Showa crater of Sakurajima volcano, Japan, Earth, Planets and Space, 61, 1345-1350, 10.1186/BF03352987
    2. Yokoo, A., Tameguri, T. and Iguchi, M. (2009) Swelling-up of lava plug associated with Vulcanian eruption at Sakurajima volcano, as revealed by infrasound record -Case study on eruption on January 2, 2007-, Bulletin of Volcanology, 71, 619-630, 10.1007/s00445-008-0247-5
    3. Yokoo, A. (2009) Study on Air Pressure Waves Induced by Volcanic Eruptions -Signals Recorded in Eruption Movies- (in Japanese), Bulletin of Volcanology Society of Japan, 54, 43-50, 10.18940/kazan.54.1_43
    1. Yokoo, A. and Ishihara, K. (2007) Analysis of pressure waves observed in Sakurajima eruption movies, Earth, Planets and Space, 59, 177-181, 10.1186/BF03352691
    2. Yokoo, A., Iguchi, M. and Ishihara, K. (2007) Geothermal activity on the flank of Sakurajima volcano inferred from infrared thermal observation (in Japanese with English abstract), Bulletin of Volcanological Society of Japan, 52, 121-126, 10.18940/kazan.52.2_121
    1. Yokoo, A., Ichihara, M., Goto, A. and Taniguchi, H. (2006) Atmospheric pressure waves in the field of volcanology, Shock Waves, 15, 295-300, 10.1007/s00193-006-0009-2
    1. Yokoo, A., Maeno, F. and Taniguchi, H. (2005) Asama Explosion of September 1st, 2004 - On the Damage to Glass Windows and Estimation of Explosion Energy (in Japanese with English abstract), Bulletin of Volcanological Society of Japan, 50, 195-201, 10.18940/kazan.50.3_195
    1. Yokoo, A. and Taniguchi, H. (2004) Application of video image processing to detect volcanic pressure waves: A case study on archived images of Aso volcano, Japan, Geophysical Research Letters, 31, L23604, 10.1029/2004GL021183
    2. Yokoo, A., Ichihara, M. and Taniguchi, H. (2004) Flashing arc on Izu-Oshima 1986 eruption (in Japanese with English abstract), Bulletin of Volcanological Society of Japan, 49, 299-304, 10.18940/kazan.49.5_299
    1. Yokoo, A., Taniguchi, H., Goto, A. and Oshima, H. (2002) Energy and depth of Usu 2000 phreatic explosions, Geophysical Research Letters, 29, 2195, 10.1029/2002GL015928
    2. Yokoo, A., Taniguchi, H., Oshima, H., Goto, A., Miyamoto, T. and Research Group on Volcanic Explosions (2002) Study on the Usu 2000 phreatic explosions in terms of field explosion experiments (in Japanese with English abstract), Bulletin of Volcanological Society of Japan, 47, 243-253, 10.18940/kazan.47.4_243
    1. Miwa, T., Nagai, M., Ueda, H., and Yokoo, A., Classification of volcanic ash particles with a convolutional neural network on RGB mirophotographs: Towards real-time monitoring of an ongoing eruption, Report of National Research Institute for Earth Science and Disaster Resilience, 88, 1-7, 2023.
    2. Uchida, H., Kanno, Y., Kishimoto, H., Yano, M., and Yokoo, A., Application examples of volcano monitoring method using correlation of infrasound waves in moving time window (in Japanese), Journal of Seismology, Volcanology and related Engineering, 87, 1, 2023. full text
    1. Miyabuchi, Y., Iizuka, Y., Hara, C., Yokoo, A., and Ohraku, T., The September 14, 2015 explosive eruption at Nakadake first crater, Aso Volcano, Japan (in Japanese), Monthly Chikyu, 43, 425-431, 2021.
    1. Yamamoto, K., Yoshikawa, S., Matsushima, T., Ohkura, T., Yokoo, A., Inoue, H., Mishima, T., Uchida, K., Sonoda, T., Seki, K., Komatsu, S., Hotta, K., and Fujita, S., Vertical ground deformation in Sakurajima Volcano measured by precise leveling survey conducted in November 2014 (in Japanese), Annuals of Disaster Prevention Research Institute, Kyoto University, 58B, 70-75, 2015. full text
    1. Yamamoto, K., Matsushima, T., Yoshikawa, S., Ohkura, T., Yokoo, A., Aizawa, K., Inoue, H., Mishima, T., Uchida, K., Sonoda, T., Seki, K., Komatsu, S., Hotta, K., Takahashi, A., Toyofuku, T., Asano, H., and Narita, T., Vertical ground deformation in Sakurajima Volcano and around Aira Caldera measured by precise leveling conducted in October and November 2013 (in Japanese), Annuals of Disaster Prevention Research Institute, Kyoto University, 57B, 116-124, 2014. full text
    1. Nakamichi, H., Aoyama, H., Nishimura, T., Hakiwara, H., Ohta, Y., Yokoo, A., and Iguchi, M., Seismic array observation close to the active crater at Suwanose-jima volcano, southwest Japan in the period from October to November 2010 (in Japanese), Annuals of Disaster Prevention Research Institute, Kyoto University, 56B, 227-235, 2013. full text
    2. Yamamoto, K., Sonoda, T., Takayama, T., Ichikawa, N., Ohkura, T., Yokoo, A., Yoshikawa, S., Inoue, H., Suwa, H., Matsushima, T., Fujita, S., and Kamizono, M., Vertical ground deformation in and around Sakurajima volcano measured by precise leveling (in Japanese), Annuals of Disaster Prevention Research Institute, Kyoto University, 56B, 187-195 2013. full text
    1. Kagiyama, T. and Yokoo, A., Volcanic activity of Nakadake crater, Aso volcano, on the aspect of failed eruption (in Japanese), Monthly Chikyu, 34, 704-705, 2012.
    2. Yokoo, A. and Ichihara, M., Cross-correlation analysis of infrasound and seismic signals at Aso volcano (in Japanese), Monthly Chikyu, 34, 753-765, 2012.
    3. Yamamoto, K., Sonoda, T., Takayama, T., Ichikawa, N., Ohkura, T., Yokoo, A., Yoshikawa, S., Inoue, H., Hotta, K., Matsushima, T., Uchida, K., and Nakamoto, M., Vertical ground deformation in Sakruajima volcano measured by precise levelling survesy (during November 2010 - November 2011) (in Japanese), Annuals of Disaster Prevention Research Institute, Kyoto University, 55B, 155-161, 2012. full text
    4. Yokoo, A., Suzuki, Y.J., and Iguchi, M., Infrasound array observation at Sakurajima volcano (in Japanese), Annuals of Disaster Prevention Research Institute, Kyoto University, 55B, 163-167, 2012. full text
    1. Yamamoto, K., Sonoda, T., Takayama, T., Ichikawa, N., Ohkura, T., Yoshikawa, S., Inoue, H., Yokoo, A., Matsushima, T., Uchida, K. and Nakamoto, M. Precise leveling survey around Sakurajima volcano (November 2010) (in Japanese with English Abstract), The 11th Joint Observations of Sakurajima Volcano, 29-34, 2011. full text
    2. Yokoo, A., Shimano, T., Matsumoto, A., Miwa, M., Kazahaya, R., Mannen K., Terada, A., Suzuki, YJ, Kohno, Y., Kozono, T., Sato, E., Hoshide, T., Nakaoka, R. and Minami, S., Report of 2011 IUGG General Assembly in Melbourne, Australia (in Japanese), Bulletin of Volcanological Society of Japan, 56, 213-219, 10.18940/kazan.56.6_213, 2011.
    3. Yokoo, A., Infrasound wave from volcanic eruptions (in Japanese), Sound, 26, 11-14, 2011. full text
    1. Aizawa, K., Yokoo, A., Kanda, W. and Ogawa, Y., Magnetotelluric pulses generated by volcanic lightning at Sakurajima volcano, Japan, Conductivity Anomaly Study Report, 12-16, 2010. full text
    2. Iguchi, M., Yokoo, A. and Tameguri, T., Intensity of volcanic explosions at Showa crater of Sakurajima volcano (in Japanese with English Abstract), Annuals of Disaster Prevention Research Institute, Kyoto University, 53B, 233-240, 2010. full text
    3. Aizawa, K., Kanda, W., Ogawa, Y., Iguchi, M., Yokoo, A., Yakiwara, H. and Sugano, T. Electric resistivity change of Sakurajima volcano from magnetotelluric continuous observation (in Japanese with English Abstract), The 11th Joint Observations of Sakurajima Volcano, 73-79, 2010. full text
    4. Shimano, T., Iguchi, M., Yokoo, A. and Miki, D. Grain size monitoring of ashfall from Showa ctarter by time series sampling at Sakurajima volcano (in Japanese with English Abstract), The 11th Joint Observations of Sakurajima Volcano, 93-96, 2010. full text
    5. Yokoo, A., Iguchi, M., Tameguri, T. and Sonoda, T., Eruption activity of Showa crater of Sakurajima volcano until 2010 (in Japanese), Report of Collaborative Study of Disaster Prevention Research Institute, Kyoto University (21G-12; Principal investigator, Shimano, T.), 3-15, 2010. full text
    6. Takimoto, H., Ishimine, Y., Kinoshita, K., Yokoo, A. and Iguchi, M., Quantitative analysis of the discharge speeds of the ash clouds from Sakurajima volcano using particle image velocimetry (in Japanese with English abstract), Report of Collaborative Study of Disaster Prevention Research Institute, Kyoto University (21G-12; Principal investigator, Shimano, T.), 17-21, 2010. full text
    7. Shimano, T., Yokoo, A., Iguchi, M. and Miki, D., Petrological monitoring of Showa crater by time series sampling of ash at Sakurajima volcano (in Japanese with English abstract), Report of Collaborative Study of Disaster Prevention Research Institute, Kyoto University (21G-12; Principal investigator, Shimano, T.), 29-35, 2010. full text
    1. Iguchi, M., et al. (55th of 83 authors), The 2008 project of artificial explosion experiment at Sakurajima volcano (in Japanese with English abstract), Annuals of Disaster Prevention Research Institute, Kyoto University, 52B, 293-307, 2009. full text
    2. Yokoo, A. and Tameguri, T., Characteristics of infrasound and seismic signals associated with eruptions at Showa crater of Sakurajima volcano (in Japanese with English abstract), Annuals of Disaster Prevention Research Institute, Kyoto University, 52B, 309-317, 2009. full text
    3. Ishimine, Y., Takimoto, H., Kanda, M., Kinoshita, K., Yokoo, A. and Iguchi, M., PIV analysis of ash clouds ejected from Showa crater of Sakurajima volcano (in Japanese with English abstract), Annuals of Disaster Prevention Research Institute, Kyoto University, 52B, 319-322, 2009. full text
    4. Aizawa, K., Kanda, W., Ogawa, Y., Yokoo, A. and Iguchi, M., Shallow resistivity changes of Sakurajima volcano from magnetotelluric continuous observation, Conductivity Anomaly Study Report, 82, 2009. full text
    1. Yokoo, A., Tameguri, T., Iguchi, M. and Ishihara, K., Sequence and characteristics of the 2007 eruption at Showa crater of Sakurajima volcano (in Japanese with English abstract), Annuals of Disaster Prevention Research Institute, Kyoto University, 51B, 267-273, 2008. full text
    2. Iguchi, M., Tameguri, T. and Yokoo, A., Progress of volcanic activity in 1997-2007 (in Japanese), The 10th Joint Observations of Sakurajima Volcano, 1-18, 2008. full text
    3. Yokoo, A. and Iguchi, M., Geothermal observation on the flank of Sakurajima volcano with infrared thermal camera (in Japanese), The 10th Joint Observations of Sakurajima Volcano, 105-112, 2008. full text
    4. Yokoo, A., Tameguri, T. and Iguchi, M., Continuous monitoring of thermal activity around Showa crater of Sakurajima volcano with an infrared thermal camera (in Japanese), The 10th Joint Observations of Sakurajima Volcano, 113-122, 2008. full text
    5. Yokoo, A. and Matsushima, N., Aerial thermal observation at Sakurajima volcano (in Japanese), The 10th Joint Observations of Sakurajima Volcano, 131-136, 2008. full text
    6. Mori, T., Kagesawa, H., Hirabayashi, J., Yamamoto, K., Miki, D., Yokoo, A., Kazahaya, K., Mori, T., Ohwada, M., Shinohara, H., Saito, G. and Yasuhara, M., Change of SO2 emission rate in the recent 10 years (in Japanese), The 10th Joint Observations of Sakurajima Volcano, 137-142, 2008. full text
    7. Yokoo, A., Iguchi, M., Tameguri, T., Watada, S. and Oikawa, J., Observation of infrasound waves associated with volcanic eruptions at Sakurajima volcano (in Japanese), The 10th Joint Observations of Sakurajima Volcano, 173-181, 2008. full text
    1. Yokoo, A. and Ishihara, K., Volcanic activity around Showa Crater of Sakurajima volcano monitored with infrared and video cameras, Annuals of Disaster Prevention Research Institute, Kyoto University, 50C, 149-156, 2007. full text
    2. Goto, A., Kagiyama, T., Miyamoto, T, Yokoo, A. and Taniguchi, H., Long-term prediction of Usu volcano 2000 eruptive activity based on the measurements of heat discharge rate (in Japanese with English abstract), Geophysical Bulletin of Hokkaido University, 70, 137-144, 2007. full text
    1. Yokoo, A. and Ishihara, K., Some characters of volcanic pressure waves derived from video images, Annuals of Disaster Prevention Research Institute, Kyoto University, 49C, 219-224, 2006. full text
    1. Maeno, F., Yokoo, A., Kanno, S., Kontani, K., Kogure, M. and Taniguchi, H., Distribution of air vibration generated by the eruption of Asama volcano on September 1st, 2004 by questionnaire survey (in Japanese with English abstract), Northeast Asian Studies, 9, 243-252, 2005. full text
    1. Yokoo, A. and Taniguchi, H., Formation process of Taisho II Secondary lava flow at Sakurajima volcano (in Japanese with English abstract), Northeast Asian Studies, 5, 93-111, 2001. full text

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