Publications of Nori Nakata

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Papers

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28 Norman H. Sleep and and Nori Nakata Nonlinear attenuation of S-waves by frictional failure at shallow depths 2017 Bull. Seismol. Soc. Am. in press
27 Erol Kalkan, Hasan S. Ulusoy, W. Wen, J.P.B. Fletcher, F. Wang, and Nori Nakata Site properties inferred at Delaney Park downhole array in Anchorage Alaska 2017 Bull. Seismol. Soc. Am. in press
26[pdf] Norman H. Sleep and Nori Nakata Nonlinear suppression of high-frequency S waves by strong Rayleigh waves 2016 Bull. Seismol. Soc. Am. 106(5) 2302-2312 doi:10.1785/0120160105
25[pdf]
[citation]
Florent Brenguier, Diane Rivet, Anne Obermann, Nori Nakata, Pierre Boué, Thomas Lecocq, Michel Campillo, and Nikolai Shapiro 4-D noise-based seismology at volcanoes: Ongoing efforts and perspectives 2016 J. Volcanol. Geoth. Res. 321 182-195 doi:10.1016/j.jvolgeores.2016.04.036
24[pdf] Michael Behm, Nori Nakata, and Götz Bokelmann Regional ambient noise tomograophy in the Eastern Alps of Europe 2016 Pure and Appl. Geophys. 173 2813-2840 doi:10.1007/s00024-016-1314-z
23[pdf] Nori Nakata Near-surface S-wave velocities estimated from traffic-induced Love waves using seismic interferometry with double beamforming 2016 Interpretation 4(4) SQ23-SQ31 doi:10.1190/INT-2016-0013.1
22[pdf] Sjoerd de Ridder, Florent Brenguier, Farnoush Forghani, Erica Galetti, Nori Nakata, and Cornelis Weemstra Introduction to special section: Ambient noise 2016 Interpretation 4(3) SJi doi:10.1190/INT-2016-0627-SPSEINTRO.1
21[pdf]
[citation]
Nori Nakata, Pierre Boué, Florent Brenguier, Philippe Roux, Valérie Ferrazzini, and Michel Campillo Body- and surface-wave reconstruction from seismic-noise correlations between arrays at Piton de la Fournaise volcano 2016 Geophys. Res. Lett. 43 1047-1054 doi:10.1002/2015GL066997
20[pdf]
[citation]
Nori Nakata and Gregory C. Beroza Reverse-time migration for microseismic sources using the geometric mean as an imaging condition 2016 Geophysics 81(2) KS51-KS60 doi:10.1190/GEO2015-0278.1
19[pdf]
[citation]
Rafal Czarny, Henryk Marcak, Nori Nakata, Zenon Pilecki, and Zbigniew Isakow Monitoring velocity changes caused by underground coal mining using seismic noise 2016 Pure and Appl. Geophys. 173 1907-1916 doi:10.1007/s00024-015-1234-3
18[pdf] Mehmet Çelebi, Hasan S. Ulusoy, and Nori Nakata Responses of a tall building in Los Angeles, California as inferred from local and distant earthquakes 2016 Earthq. Spectra 32(3) 1821-1843 doi:10.1193/050515EQS065M
17[pdf]
[citation]
Florent Brenguier, P. Kowalski, N. Ackerley, Nori Nakata, Pierre Boué, Michel Campillo, Eric Larose, S. Rambaud, C. Pequegnat, T. Lecocq, Philippe Roux, V. Ferrazzini, N. Villeneuve, N. M. Shapiro, and J. Chaput Towards 4-D noise-based seismic probing of volcanoes: Perspectives from a Large-N experiment on Piton de la Fournaise Volcano 2016 Seismol. Res. Lett. 87(1) 15-25 doi:10.1785/0220150173
16[pdf]
[citation]
Nori Nakata and Gregory C. Beroza Stochastic characterization of mesoscale seismic velocity heterogeneity in Long Beach, California 2015 Geophys. J. Int. 203 2049-2054 doi:10.1093/gji/ggv421
Supporting information
15[pdf]
[citation]
Nori Nakata, Wataru Tanaka, and Yoshiya Oda Damage detection of a building caused by the 2011 Tohoku-Oki earthquake with seismic interferometry 2015 Bull. Seismol. Soc. Am. 105(5) 2411-2419 doi:10.1785/0120140220
14[pdf]
[citation]
Rie Kamei, Nori Nakata and David Lumley Introduction to microseismic source mechanisms 2015 The Leading Edge 34(8) 876-880 doi:10.1190/tle34080876.1
13[pdf]
[citation]
Norman H. Sleep and Nori Nakata Nonlinear attenuation from the interaction between different types of seismic waves and interaction of seismic waves with shallow ambient tectonic stress 2015 Geochem. Geophys. Geosyst. 16 2336-2363 doi:10.1002/2015GC005832
12[pdf] Nori Nakata, Jason P. Chang, Jesse F. Lawrence, and Pierre Boué Body-wave extraction and tomography at Long Beach, California, with ambient-noise interferometry 2015 J. Geophys. Res. 120 1159-1173 doi:10.1002/2015JB011870
Stanford news
Interviewed by KGO radio, NBC Bay Area, Boston Globe, ASCE, Daily Mail
11[pdf] Nori Nakata, Roel Snieder, and Michael Behm Body-wave interferometry using regional earthquakes with multi-dimensional deconvolution after wavefield decomposition at free surface 2014 Geophys. J. Int. 199 1125-1137 doi:10.1093/gji/ggu316
10[pdf] Nori Nakata and Roel Snieder Monitoring a building using deconvolution interferometry. II: Ambient-vibration analysis 2014 Bull. Seismol. Soc. Am. 104(1) 204-213 doi:10.1785/0120130050
9[pdf] Nori Nakata Combination of Hi-net and KiK-net data for deconvolution interferometry 2013 Bull. Seismol. Soc. Am. 103(6) 3073-3082 doi:10.1785/0120130101
8[pdf] Nori Nakata, Roel Snieder, Seiichiro Kuroda, Shunichiro Ito, Takao Aizawa, and Takashi Kunimi Monitoring a building using deconvolution interferometry. I: Earthquake-data analysis 2013 Bull. Seismol. Soc. Am. 103(3) 1662-1678 doi:10.1785/0120120291
7[pdf] Nori Nakata and Roel Snieder Time-lapse change in anisotropy in Japan's near surface caused by the 2011 Tohoku-Oki earthquake 2012 Geophys. Res. Lett. 39 L11313 doi:10.1029/2012GL051979
6[pdf] Nori Nakata and Roel Snieder Estimating near-surface shear-wave velocities in Japan by applying seismic interferometry to KiK-net data 2012 J. Geophys. Res. 117 B01308 Resaerch highlights: Nature, AGU
doi:10.1029/2011JB008595
5[pdf] Nori Nakata and Roel Snieder Near-surface weakening in Japan after the 2011 Tohoku-Oki earthquake 2011 Geophys. Res. Lett. 38 L17302 Resaerch highlights: IRIS
doi:10.1029/2011GL048800
4[pdf] Norimitsu Nakata, Roel Snieder, Takeshi Tsuji, Ken Larner, and Toshifumi Matsuoka Shear-wave imaging from traffic noise using seismic interferometry by cross-coherence 2011 Geophysics 76(6) SA97-SA106 doi:10.1190/GEO2010-0188.1
3[pdf] Takeshi Tsuji, Jack Dvorkin, Gary Mavko, Norimitsu Nakata, Toshifumi Matsuoka, Ayako Nakanishi, Shuichi Kodaira, and Osamu Nishizawa Vp/Vs ratio and shear-wave splitting in the Nankai Trough seismogenic zone: Insights into effective stress, pore pressure and sediment consolidation 2011 Geophysics 76(3) WA71-WA82 doi:10.1190/1.3560018
2[pdf] Norimitsu Nakata,Takeshi Tsuji, and Toshifumi matsuoka Acceleration of computation speed for elastic wave simulation using Graphic Processing Unit 2011 Explor. Geophys. 42 98-104 doi:10.1071/EG10039
1[pdf] Norimitsu Nakata Speeding up large-scale seismic data processing using GPU 2009 Buturi-Tansa 62(2) 234-235 in Japanese
copyright: ASEG, SEGJ, KSEG, SEG, AGU, SSA, GJI
Entries Per Page
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Brenguier, F., D. Rivet, A. Obermann, N. Nakata, P. Boué, T. Lecocq, M. Campillo, and N. Shapiro (2016), 4-D noise-based seismology at volcanoes: Ongoing efforts and perspectives, J. Volcanol. Geoth. Res., 321, 182-195, doi:10.1016/j.jvolgeores.2016.04.036


@Article{2016brenguier2,
  Title                    = {4-D noise-based seismology at volcanoes: {O}ngoing efforts and perspectives},
  Author                   = {Florent Brenguier, Diane Rivet, Anne Obermann, Nori Nakata, Pierre Bou\'{e}, Michel Campillo, and Nikolai Shapiro},
  Journal                  = {J. Volcanol. Geoth. Res.},
  Year                     = {2016},
  Pages                    = {182--195},
  Volume                   = {321}
}
    

Nakata, N., P. Boué, F. Brenguier, P. Roux, V. Ferrazzini, and M. Campillo (2016), Body- and surface-wave reconstruction from seismic-noise correlations between arrays at Piton de la Fournaise volcano, Geophys. Res. Lett., 43, 1047-1054, doi:10.1002/2015GL066997


@Article{2016nakata,
  Title                    = {Body- and surface-wave reconstruction from seismic-noise correlations between arrays at Piton de la Fournaise volcano},
  Author                   = {Nori Nakata, Pierre Bou\'{e}, Florent Brenguier, Pilippe Roux, Val\'{e}rie Ferrazzini, and Michel Campillo},
  Journal                  = {Geophys. Res. Lett..},
  Year                     = {2016},
  Pages                    = {1047--1054},
  Volume                   = {43}
}
    

Nakata, N. and G. C. Beroza (2015), Stochastic characterization of mesoscale seismic velocity heterogeneity in Long Beach, California, Geophys. J. Int., 203, 2049-2054, doi:10.1093/gji/ggv421


@Article{2015nakata3,
  Title                    = {Stochastic characterization of mesoscale seismic velocity heterogeneity in Long Beach, California},
  Author                   = {Nori Nakata and Gregory C. Beroza},
  Journal                  = {Geophys. J. Int.},
  Year                     = {2015},
  Pages                    = {2049--2054},
  Volume                   = {203}
}
    

Nakata, N., W. Tanaka, and Yoshiya Oda (2015), Damage detection of a building caused by the 2011 Tohoku-Oki earthquake with seismic interferometry, Bull. Seismol. Soc. Am., 105(5), 2411-2419, doi:10.1785/0120140220


@Article{2015nakata2,
  Title                    = {Damage detection of a building caused by the 2011 {T}ohoku-{O}ki earthquake with seismic interferometry},
  Author                   = {Nori Nakata, Wataru Tanaka, and Yoshiya Oda},
  Journal                  = {Bull. Seismol. Soc. Am.},
  Year                     = {2015},
  Number                   = {5},
  Pages                    = {2411--2419},
  Volume                   = {105}
}
    

Kamei, R., N. Nakata, and D. Lumley (2015), Introduction to microseismic source mechanisms, The Leading Edge, 34, 876-880, doi:10.1190/tle34080876.1.


@Article{2015kamei,
  Title                    = {Introduction to microseismic source mechanisms},
  Author                   = {Rie Kamei and Nori Nakata and David Lumley},
  Journal                  = {The Leading Edge},
  Year                     = {2015},
  Number                   = {8},
  Pages                    = {876--880},
  Volume                   = {34}
}
    

Sleep, N. H. and N. Nakata (2015), Nonlinear attenuation from the interaction between different types of seismic waves and interaction of seismic waves with shallow ambient tectonic stress, Geochem. Geophys. Geosyst., 16, 2336-2363, doi:10.1002/2015GC005832.


@Article{2015sleep,
  Title                    = {Nonlinear attenuation from the interaction between different types of seismic waves and interaction of seismic waves with shallow ambient tectonic stress},
  Author                   = {Norman H. Sleep and Nori Nakata},
  Journal                  = {Geochem. Geophys. Geosyst.},
  Year                     = {2015},
  Pages                    = {2336--2363},
  Volume                   = {16}
}
    




Conferences

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55 Nori Nakata, Gregory C. Beroza, and William L. Ellsworth Seismicity and structure changes following the 2016 Kumamoto earthquake 2016 AGU Fall meeting San Francisco, CA, USA December 12-16
54 Zack Spica, Nori Nakata, and Gregory C. Beroza Ambient field analysis at Groningen gas field 2016 AGU Fall meeting San Francisco, CA, USA December 12-16
53 Nori Nakata Seismicity and structure responses following the 2016 Kumamoto earthquake 2016 11th Joint meeting U.S.-Japan Natural Resources Panel on Earthquake Research Napa, CA, USA November 16-18
52 Nori Nakata, Gregory C. Beroza, Junzhe Sun, and Sergey Fomel Migration-based passive source imaging fo continuous data 2016 86th SEG annual meeting Dallas, TX, USA December 15-21
51 Junzhe Sun, Zhiguang Xue, Sergey Fomel, Tieyuan Zhu, and Nori Nakata Full waveform inversion of passive seismic data with unknown sources 2016 86th SEG annual meeting Dallas, TX, USA December 15-21
50 Nori Nakata and Gregory C. Beroza Assessment of predictive values of site response based on GMPE approaches using a Large-N array 2016 SCEC annual meeting Palm Springs, CA, USA September 11-14
49 Nori Nakata and Gregory C. Beroza Characterization of spatial variability of ground motion using a very dense array at Long Beach, California 2016 SSA annual meeting Reno, Nevada, USA April 20-22
48 Nori Nakata, Gregory C. Beroza, and Victor M. Cruz-Atienza Imaging low-frequency earthquakes with geometric-mean reverse time migration 2015 AGU Fall meeting San Francisco, CA, USA Dec 14-18
47 Nori Nakata, Pierre Boué, and Gregory C. Beroza Body-wave retrieval and imaging from ambient seismic fields with very dense arrays 2015 AGU Fall meeting San Francisco, CA, USA Dec 14-18 invited
46 Florent Brenguier, Nori Nakata, et al. Towards 4-D noise-based seismic probing of volcanoes: Perspectives from a Large-N Nodal experiment on Piton de la Fournaise volcano 2015 AGU Fall meeting San Francisco, CA, USA Dec 14-18
45 Nori Nakata and Gregory C. Beroza Data-driven characterization of subsurface structure with dense arrays at Long Beach and Diablo Canyon, California, USA 2015 International workshop on Best Practices in Physics-based Fault Rupture Models for Seismic Hazard Assessment of Nuclear Installations Vienna, Austria Nov 18-20
44 Nori Nakata and Gregory C. Beroza Reverse-time migration for microseismic sources using the geometric mean as an imaging condition 2015 85th SEG annual meeting New Orleans, LA, USA Oct 19-23
43 Nori Nakata and Gregory C. Beroza Stochastic characterization of 3D mesoscale seismic velocity heterogeneity in Long Beach, California 2015 SCEC annual meeting Palm Springs, CA, USA Sep 13-16
42 Nori Nakata Analysis of ambient noise continuously recorded by 2D dense arrays 2015 Symposium on energy and environmental geosciences Tokyo Japan May 8 in Japanese
41 Nori Nakata and Gregory C. Beroza Two-way reverse-time imaging for seismic sources 2015 SSA Annual Meeting Pasadena, CA, USA Apr 21-23
40 Norman H. Sleep and Nori Nakata Nonlinear interaction of strong S-waves, surface waves, P-waves, and near-field velocity pulses in the shallow subface leading to nonlinear attenuation 2015 SSA Annual Meeting Pasadena, CA, USA Apr 21-23
39 Pierre Boué, Laurent Stehly, Nori Nakata, and Gregory C. Beroza Empirical sensitivity kernels of noise correlations with respect to virtual sources 2014 AGU Fall meeting San Francisco, CA, USA Dec 15-19
38[abs] Nori Nakata, Jason P. Chang, and Jesse F. Lawrence P diving wave tomography using ambient noise recorded at Long Beach 2014 AGU Fall meeting San Francisco, CA, USA Dec 15-19
37 Nori Nakata, Rie Kamei, and David Lumley Microseismic source mechanisms 101 2014 84th SEG annual meeting, post-convention workshop Denver, Colorado, USA Oct 31
36[pdf] Nori Nakata, Jason P. Chang, and Jesse F. Lawrence Body-wave extraction and tomography at Long Beach, CA, with ambient-noise interferometry 2014 84th SEG annual meeting Denver, Colorado, USA Oct 27-31
35 Jason P. Chang, Nori Nakata, Robert G. Clapp, and Biondo Biondi High-frequency surface and body waves from ambient noise cross-correlations at Long Beach, CA 2014 84th SEG annual meeting Denver, Colorado, USA Oct 27-31
34[abs] Nori Nakata, Kiwamu Nishida, and Hitoshi Kawakatsu Wave propagation between F-net and NECESSArray retrieved from ambient noise 2014 SCEC annual meeting Palm Springs, CA, USA September
33 Nori Nakata Body-wave extraction from ambient noise recorded by a dense array 2014 Workshop for wave propagation Tokyo, Japan September in Japanese
32 Nori Nakata Frequency-dependent time-lapse velocity changes caused by the 2011 Tohoku-Oki earthquake 2014 Joint SEG/AGU Summer Research Workshop: Advances in Active+Passive "Full Wavefield" seismic imaging: from reservoirs to plate tectonics Vancouver, Canada July
31 Jason P. Chang, Taylor Dahlke, Nori Nakata, and Biondo Biondi Resolving subsurface structure from cross-correlation of continuously recorded ambient noise at Long Beach, CA 2014 Spring 2014 Conference; Big Data for Energy and Environment Stanford, CA, USA May
30 Kazuya Shiraishi and Nori Nakata Seismic interferometry in image domain using reverse time migration 2014 130th SEGJ Conference Tokyo, Japan May in Japanese
29[abs] Nori Nakata and Jesse Lawrence Depth constraint of velocity changes caused by the 2011 Tohoku-Oki earthquake 2014 SSA Annual Meeting Anchorange, Alaska, USA April
28 Nori Nakata and Roel Snieder Monitoring a building using deconvolution interferometry from earthquake and ambient-noise data 2014 SSA Annual Meeting Anchorange, Alaska, USA April
27 Michael Behm, Nori Nakata, Irene Bianchi, and Götz Bokelmann Love and Rayleigh wave dispersion from regional ambient noise tomography in the Eastern Alps of Europe 2014 EGU General Assembly Vienna, Austria April 2014-6021
26 Nori Nakata Application of deconvolution interferometry with both Hi-net and KiK-net data 2013 AGU Fall meeting San Francisco, CA, USA Dec 9-13
25 Michael Behm, Nori Nakata (speaker), Götz Bokelmann, and Simon Lloyd Ambient noise tomography in the Eastern Alps of Europe 2013 AGU Fall meeting San Francisco, CA, USA Dec 9-13
24 Nori Nakata and Roel Snieder Interferometry with passive seismic data: Imaging and Monitoring 2013 EAGE/SEG Forum 2013, Turning noise into geological information: The next big step? Lisbon, Portugal Nov 11-14
23 Nori Nakata and Roel Snieder Body-wave interferometry using local earthquakes with multi-dimensional deconvoution and wavefield decomposition at free surface 2013 83rd SEG annual meeting Houston, Texas, USA Sep 22-27
22 Nori Nakata and Roel Snieder
仲田典弘, Roel Snieder
Time-lapse changes in velocity and anisotropy after the 2011 Tohoku earthquake estimated by seismic interferometry
地震波干渉法を用いた東北沖地震に伴う時間変化の解析
2013 Japan Geoscience Union Meeting (JpGU)
日本地球惑星科学連合2013年大会
Chiba, Japan May invited, in Japanese
21 Roel Snieder and Nori Nakata (speaker) Time-lapse changes in velocity and anisotropy in Japan's near surface after the 2011 Tohoku earthquake 2012 AGU Fall meeting San Francisco, CA, USA Dec 3-7 invited
20 Nori Nakata and Roel Snieder Time-lapse change in near-surface shear-wave velocities caused by rainfall and large earthquakes detected by applying seismic interferometry to earthquake data 2012 82th SEG annual meeting Las Vegas, NV, USA Nov 4-9
19 Roel Snieder, Nori Nakata, Filippo Broggini, Kees Wapenaar, and Jyoti Behura Development in seismic interferometry: Time-lapse monitoring and autofocusing of internal multiples 2012 82th SEG annual meeting Las Vegas, NV, USA Nov 4-9
18 Roel Snieder, Filippo Broggini, Nori Nakata, and Kees Wapenaar Autofocusing of wave fields 2012 IUGG Conference of Mathematical Geophysics Edinburgh, Scotland June invited
17 Roel Snieder, Nori Nakata, Masatoshi Miyazawa, and Kees Wapenaar Seismic interferometry; who needs a seismic source? 2012 Summer School of Waves in Complex Media Heraklion, Greece June
16 Nori Nakata and Roel Snieder Weakening of the near surface in Japan after the 2011 Tohoku-Oki earthquake detected by deconvolution interferometry 2012 SSA Annual Meeting San Diego, CA, USA April Seismol. Res. Lett., 83, 2, 410
15 Nori Nakata, Roel Snieder, Seiichiro Kuroda, Conrad Newton, Shunichiro Ito, Takao Aizawa, Takashi Kunimi, and Toshifumi Matsuoka Time-lapse monitoring a building with deconvolution interferometry applied to earthquake and ambient noise data 2011 AGU fall meeting San Francisco, CA, USA Dec
14 Nori Nakata and Roel Snieder Monitoring near-surface shear-wave velocities in Japan using KiK-net data 2011 The 10th SEGJ International Symposium Kyoto, Japan Nov pp. 294-297
13 Roel Snieder, Nori Nakata, Kees Wapenaar, and Evert Slob Extracting the earth response from noise and complex earthquake data 2011 162nd meeting of the Acoustical Society of America San Diego, CA, USA Nov
12 Nori Nakata, Roel Snieder, Ken Larner, Takeshi Tsuji, and Toshifumi Matsuoka Shear wave imaging with seismic interferometry of traffic noise 2011 SEG annual meeting San Antonio, TX, USA Sep pp. 1580-1585
11 Roel Snieder, Norimitsu Nakata, Takeshi Tsuji, Toshifumi Matsuoka Shear wave imaging with seismic interferometry of traffic noise 2010 AGU fall meeting San Francisco, CA, USA Dec invited
10 Takeshi Tsuji, Norimitsu Nakata, Toshifumi Matsuoka, Jack Dvorkin, Ayako Nakanishi, Shuichi Kodaira Vp/Vs and shear-wave splitting at the seismogenic plate subduction zone: Insight into effective-stress and pore pressure distribution 2010 SEG annual meeting Denver, CO, USA Oct pp. 1635-1640
9 Akihisa Takahashi, Norimitsu Nakata, Shinji Kawasaki, Ziqiu Xue, and Toshifumi Matsuoka 4D response evaluation criteria for permanent OBC monitoring 2010 SEG D&P Forum Boston, MA, USA July
8 Norimitsu Nakata, Takeshi Tsuji, Toshifumi Matsuoka Acceleration of the simulation of elastic wave propagation using GPU 2010 The Bali 2010 International Geoscience Conference and Exposition Bali Indonesia July IGCE10-OS-072
7 Norimitsu Nakata and Toshifumi Matsuoka
仲田典弘, 松岡俊文
Virtual receivers by seismic interferometry
地震波干渉法による仮想受振器
2010 122nd SEGJ conference
物理探査学会第122回学術講演会
Tokyo, Japan June in Japanese, pp. 52-55
6 Norimitsu Nakata, Shinji Kawasaki, Akihisa Takahashi, Ziqiu Xue, Toshifumi Matsuoka
仲田典弘, 川崎慎治, 高橋明久, 薛自求, 松岡俊文
Modeling on verification of availability of time-lapse seismic survey when storing CO2 in complex reservoirs
日本の地質特性を考慮した地震波探査によるCO2モニタリングの有効性の検討
2010 Japan Geoscience Union Meeting
日本地球惑星科学連合2010年大会
Chiba, Japan May in Japanese, MAG021-14
5 Norimitsu Nakata, Toshifumi Matsuoka, Takeshi Tsuji, and Roel Snieder Interferometric Imaging by Cross Coherence 2009 SEG Annuall meeting workshop Houston, Texas, USA Oct p. 4215
4 Norimitsu Nakata
仲田典弘
Acceleration of seismic analysis using GPU
GPUを用いた大規模物理探査解析の高速化
2008 Idea Competition in SEGJ 60th anniversary
物理探査学会60周年記念事業アイディアコンペティション
Tokyo, Japan Oct in Japanese
3 Norimitsu Nakata, Toshifumi Matsuoka, Kyosuke Onishi, Takeshi Tsuji, Changyun Lee, Kentaro Torii, Takao Aizawa, Toshinori Kimura
仲田典弘, 松岡俊文, 尾西恭亮, 辻健, 李昌鉉, 鳥居健太郎, 相澤隆生, 木村俊則
Subsurface structure from train induced elastic waves using seismic interferometry
地震波干渉法による電車振動を震源とした地下可視化の試み
2008 118th SEGJ conference
物理探査学会第118回学術講演会
Tokyo, Japan May in Japanese, pp. 75-78
2 Kentaro Torii, Norimitsu Nakata(speaker), Toshifumi Matsuoka, Takeshi Tsuji, Takao Aizawa
鳥居健太郎, 仲田典弘(発表者), 松岡俊文, 辻健, 相澤隆生
Seismic interferometry using Hi-net data
Hi-netデータへの地震波干渉法の適用
2008 Japan Geoscience Union Meeting
日本地球惑星科学連合2008年大会
Chiba, Japan May in Japanese, S226-P016
1 Norimitsu Nakata, Toshifumi Matsuoka, Changhyun Lee, Kentaro Torii, Toshinori Kimura
仲田典弘, 松岡俊文, 李昌鉉, 鳥居健太郎, 木村俊則
Subsurface imaging using vibrations of subway
地下鉄の振動を利用した地下可視化の試み
2007 MMIJ in Kansai
資源素材学会第4回若手研究者・学生のための研究発表会
Kyoto, Japan Dec in Japanese
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We retrieve P diving waves by applying seismic interferometry to ambient noise records observed at Long Beach, California, and invert travel times of these waves to estimate 3D P-wave velocity structure. The ambient noise is recorded by a 2D dense and large network (2500 receivers with 100-m spacing) at Long Beach, CA. In contrast from surface-wave extraction, body-wave extraction is much harder for surface acquisition because body-wave energy is smaller than surface waves. The crosscorrelation functions at a receiver pair obtained from ambient-noise data does not show clear body waves. Although we can reconstruct body waves when we stack correlation functions over all receiver pairs, we need to extract body waves at each receiver pair separately for imaging spatial heterogeneity of subsurface structure. Therefore, we employ two filters, which isolate body-wave energy and enhance signal-to-noise ratio, after correlation to seek body waves between single receiver pairs. After these steps, we can reconstruct clear body waves from each virtual source. As an application of using extracted body waves, we estimate 3D P-wave velocities with travel-time tomography. The velocities estimated from body waves are much higher resolution than those from surface waves.

We apply cross-correlation techniques to ambient noise to retrieve propagating waves between F-net in Japan and NECESSArray in China. Both F-net and NECESSArray are continuous-recording broadband-seismometer networks and consist of about 80 and 120 receivers, respectively. NECESSArray was deployed in the northeast China during September 2009 and August 2011. The receiver spacing is about 80 km, and the size of the entire array is roughly 1500 km (east-west) by 650 km (north-south). Based on the shape of the arrays, with F-net and NECESSArray, we can create a large network that surrounds the sea of Japan and extract wavefields traveling through the sea by applying seismic interferometry to ambient noise. In the period of 50-100 s, the retrieved wavefields propagate about 4 km/s and 7 km/s, which corresponds to Rayleigh and P wave velocities, respectively. Because of the data quality or excitation, the crosscorrelation of vertical-vertical components has better signal-to-noise ratio than other combinations. The extracted wavefields can be used for imaging of velocity structure, time-lapse studies, or analyses of seismic anisotropy. In this study, we propose the image the velocity structure at the sea of Japan as an application to use the wavefields. Another potential of the large network is to extract global reflections from ambient noise because the sensors are all broadband. We are grateful to NIED and the people involved in the NECESSArray project for providing the data.

The 2011 Mw9.0 Tohoku-Oki earthquake caused changes in near-surface seismic velocities, which are measured by computing transfer functions of small earthquake data recorded by the Japanese strong-motion recording network, KiK-net. Although this analysis works well and one can estimate changes in velocities all over Japan, the estimated changes are averaged values over the depth of KiK-net borehole receivers. Also, intervals of time-lapse measurements depend on how often earthquakes occur. Here, we analyze surface waves of ambient-noise data observed by the high sensitivity seismometer network (Hi-net) using cross-coherence techniques and discuss the depth constraint of the changes in velocities. Ambient noise is suitable for time-lapse measurements because of their continuity. After cross coherence, we obtain traveling waves from one station to another station. To enhance the signal-to-noise ratio in higher frequencies, we employ the adaptive covariance filter, which is a noise-suppression filter. Then we apply coda-wave interferometry to the cross-coherence functions and estimate the changes in velocities between two time intervals (before and after the Tohoku-Oki earthquake) at each frequency. Since the frequency of surface waves relates to the depth penetration of the waves, we can invert the depth variation of the changes. For this inversion, we also use the changes estimated from KiK-net data. With these analyses, we find that most of the changes occur in the very near surface.




Theses

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Year

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PhD (Colorado School of Mines) Seismic interferometry for temporal monitoring 2013 Roel Snieder [pdf]
MSc (Kyoto Univ) Virtual world in Geophysics: synthesized data by interferometry and simulation 2010 Toshifumi Matsuoka [pdf]
BSc (Kyoto Univ) Subsurface structures from train induced elastic waves using seismic interferometry (in Japanese) 2008 Toshifumi Matsuoka [pdf]
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