KOIZUMI Naoji

写真a

Title

Professor

Research Fields, Keywords

Earthquake, Groundwater, Crustal Deformation

Homepage URL

http://db.spins.usp.ac.jp/html/200000240_ja.html

Profile

Research Interest:
Studies of relationship among groundwater, crustal deformation and earthquake.
Hydrological and geochemical research for prediction of earthquake and volcanic eruption

Graduating School 【 display / non-display

  • Kyoto University  Faculty of Science  1981.03

Graduate School 【 display / non-display

  • Kyoto University  Graduate School, Division of Natural Science  Doctor's Course  1988.12

Campus Career 【 display / non-display

  • University of Shiga Prefecture  School of Environmental Science  Department of Ecosystemus Studies  Professor   2015.10 - Now

External Career 【 display / non-display

  • National Institute of Advanced Industrial Science and Technology  Geological Survey of Japan  Group Leader, Principal Research Manager   2001.04 - 2015.09

Academic Society Affiliations 【 display / non-display

  • American Geophysical Union

Field of expertise (Grants-in-aid for Scientific Research classification) 【 display / non-display

  • Solid earth and planetary physics

  • Meteorology/Physical oceanography/Hydrology

  • Natural disaster / Disaster prevention science

  • Other

 

Papers 【 display / non-display

  • Postseismic well water level increases at the Dogo hot spring in Japan

    Koizumi N. and C.Kinoshita

    Seismological Society of Japan  Journal of Seismological Society of Japan  70   125 - 134  2017.06

    DOI: 10.4294/zisin.2016-21  Joint Work  Joint(The main charge)

  • Groundwater pressure changes and crustal deformation before and after the 2007 and 2014 eruptions of Mt.Ontake

    Koizumi.N., T.Sato, Y.Kitagawa and T.Ochi

    Springer  Earth Planets and Space  68    2016.03

    10.1186/s40623-016-0420-6  Joint Work  Joint(The main charge)

    [Abstract]

    Volcanic activity generally causes crustal deformation, which sometimes induces groundwater changes, and both of these phenomena are sometimes detected before volcanic eruptions. Therefore, investigations of crustal deformation and groundwater changes can be useful for predicting volcanic eruptions. The Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, has been observing groundwater pressure at Ohtaki observatory(GOT) since 1998. GOT is about 10 km southeast of the summit of Mt. Ontake. During this observation period, Mt. Ontake has erupted twice, in 2007 and in 2014. Before the 2007 eruption, the groundwater pressure at GOT clearly dropped, but it did not change before or after the 2014 eruption. These observations are consistent with the crustal deformation observed by Global Navigation Satellite System stations of the Geospatial Information Authority of Japan. The difference between the 2007 and 2014 eruptions can be explained if a relatively large magma intrusion occurred before the 2007 eruption but no or a small magma intrusion before the 2014 eruption.

  • Relation between the strong ground motion and coseismic well water level rises during the 1999 Chi-Chi, Taiwan, earthquake in the alluvial fan near the hypocentral region

    Higa,M., M.Nakamura, N.Koizumi and W.-C. Lai

    Geological Survey of Japan, AIST  67 (1)   1 - 10  2016.04

    Joint Work  Joint(The vice charge)

    [Abstract]

    We compared the coseismic well water level rises (Cw) and the strong ground motions during the 1999 Chi-Chi, Taiwan, earthquake in the Quaternary alluvial fan near the hypocentral region using data produced by the dense networks of strong ground motion and groundwater observation. The correlation between the Cw of the shallowest aquifer (Layer 1) and the ground motion response spectra at 1 Hz (Sv(1.0)) is stronger than that at 0.1 Hz (Sv(0.1)). On the other hand, the correlation between the Cw of the deeper aquifers (Layers 2-1, 2-2, 3 and 4) and Sv (1.0) are weaker than that at 0.1 Hz. We also found the good correlation between the Cw and hydraulic conductivity in the all aquifers. It is difficult to estimate Cw only by the spectral amplitude even in a Quaternary alluvial fan, where the geological and geomorphological conditions are similar.

  • Detection of short-term slow slip events along the Nankai Trough via groundwater observations

    Kitagawa,Y., N.Koizumi

    American Geophysical Union  Geophys. Res. Lett  40   6079 - 6083  2013.12

    10.1002/2013GL058322  Joint Work  Joint(The vice charge)

  • 地下水観測による地震予知研究-地下水位変化から地殻変動を推定する事による地震予測

    小泉尚嗣

    国立研究開発法人産業技術総合研究所  Synthesiology  6 (1)   24 - 33  2013

    Single Work  

  • Coseismic and postseismic groundwater pressure changes

    Koizumi N.

     Journal of Geography  122 (1)   159 - 169  2013

    Single Work  

  • Recent hydrological and geochemical researches for earthquake prediction in Japan

    Matsumoto N., N.Koizumi

    Springer  Natural Hazards    2011

    10.1007/s11069-011-9980-8  Joint Work  Joint(The vice charge)

  • Frequency characteristics of the response of water pressure in a closed well to volumetric strain in the high‐frequency domain

    Kitagawa Y., S.Itaba, N.Matsumoto, N.Koizumi

    American Geophysical Union  Journal of Geophysical Research  116    2011

    10.1029/2010JB007794  Joint Work  Joint(The vice charge)

  • Evaluation of the effects of ground shaking and static volumetric strain change on earthquake-related groundwater level changes in Taiwan

    Lai W.-C., K.-C. Hsu., C.-L. Shieh,Y.-P. Lee.,K.-C. Chung, N. Koizumi, . Matsumoto

    Springer  Earth Planets Space  62   391 - 400  2010

    Joint Work  Joint(The vice charge)

  • Continuous observation of groundwater and crustal deformation for forecasting Tonankai and Nankai Earthquakes in Japan

    Itaba S., N. Koizumi, N. Matsumoto, R. Ohtani

    Springer  Continuous observation of groundwater and crustal deformation for forecasting Tonankai and Nankai Earthquakes in Japan  167   1105 - 1114  2010

    10.1007/s00024-010-0095-z  Joint Work  Joint(The vice charge)

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Books 【 display / non-display

  • Science of Earthquake Prediction

    I.Kawasaki, N.Koizumi, S.Tsukada, T.Nagao, T.Nishimura, Y.Hiramatsu, T.Hori, K.Yamaoka

    University of Tokyo Press  218p  2007

    Scholarly Book  Joint Work