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Research paper : Constructing a system to explore shallow velocity structures using a miniature microtremor array (I. CHO et al.)−96−Synthesiology - English edition Vol.9 No.2 (2016) References[1]S. Senna, H. Azuma, Y. Murui and H. Fujiwara: Development of microtremor survey observation system ‘i-bidou’ etc., Proceeding of the SEGJ Conference 124, 346–348 (2011) (in Japanese).[2]S. Senna, S. Adachi, H. Ando, T. Araki, K. Iisawa and H. Fujiwara: Development of microtremor survey observation system, Proceeding of the SEGJ Conference 115, 227–229 (2006) (in Japanese).[3]K. Aki: Space and time spectra of stationary stochastic waves, with special reference to microtremors, Bull. Earthquake Res. Inst., 35, 415–457 (1957).[4]M. N. Toksöz and R. T. Lacoss: Microseisms: Mode structure and sources, Science, 159, 872–873 (1968).[5]R. A. Haubrich and K. McCamy: Microseisms: Coastal and pelagic sources, Review of Geophysics, 7, 539–571 (1969).[6]H. Okada and N. Sakajiri: Estimates of an S wave velocity distribution using long-period microtremors, Geophysical Bulletin of Hokkaido University, 42, 119–143 (1983) (in Japanese).[7]H. Okada, T. Matsushima, T. Moriya and T. Sasatani: An exploration technique using long-period microtremors for determination of deep geological structures under urbanized areas, BUTSURI-TANSA, 43, 402–417 (1990) (in Japanese).[8]Chiba Prefectural Government: 1998 Chiba Prefecture subsurface structural survey (1999) (in Japanese).[9]Yokohama City: 1998 subsurface structural survey for the Kanto Plain (Yokohama City area) (1999) (in Japanese).[10]H. Okada: The Microtremor Survey Method, Geophysical Monograph Series, 12, Society of Exploration Geophysicists, Tulsa (2003).[11]Standardization Committee of the Society of Exploration Geophysicists of Japan: Applications manual of geophysical methods to engineering and environmental problems, 111–126 (2008) (in Japanese).[12]Tokyo Metropolitan Government: Report of survey results of subcontracted microtremor array exploration in 23 wards (no. 1) (2004) (in Japanese).[13]I. Cho, T. Tada and Y. Shinozaki: A new method to determine phase velocities of Rayleigh waves from microseisms, Geophysics, 69 (6), 1535–1551 (2004).[14]I. Cho, T. Tada and Y. Shinozaki: A generic formulation for microtremor exploration methods using three-component records from a circular array, Geophys. J. Int., 165 (1), 236–258 (2006).[15]I. Cho, T. Tada and Y. Shinozaki: Centerless circular array method: Inferring phase velocities of Rayleigh waves in broad wavelength ranges using microtremor records, J. Geophys. Res., 111, B09315, doi:10.1029/2005JB004235 (2006).[16]I. Cho, T. Tada and Y. Shinozaki: A new method of microtremor exploration using miniature seismic arrays—Quick estimation of average shear velocities of the shallow soil, BUTSURI-TANSA, 61 (6), 457–468 (2008) (in Japanese).[17]T. Tada, I. Cho and Y. Shinozaki: Beyond the SPAC method: Exploiting the wealth of circular-array methods for microtremor exploration, Bull. Seism. Soc. Am., 97 (6), 2080–2095, doi:10.1785/0120070058 (2007).[18]T. Tada, I. Cho and Y. Shinozaki: New circular-array microtremor techniques to infer Love-wave phase velocities, Bull. Seism. Soc. Am., 99 (5), 2912–2926, doi:10.1785/0120090014 (2009).[19]T. Tada, I. Cho and Y. Shinozaki: Analysis of Love-wave components of microtremors, Proc. 7th International Conference on Urban Earthquake Engineering, 115–124 (2010).[20]I. Cho, S. Senna and H. Fujiwara: Miniature array analysis of microtremors, Geophysics, 78 (1), KS13–KS23, 10.1190/ GEO2012-0248.1 (2013).[21]S. Senna, I. Cho and H. Fujiwara: Sophistication of microtremor methods to survey shallow structures, Summaries of technical papers of Annual Meeting (Kinki), Architectural Institute of Japan 2014, 355–356 (2014) (in Japanese).[22]I. Cho: On the generalization of the SPAC method and the development of a CCA method, Abstracts, Japan Geoscience Union Meeting (2014) (in Japanese).[23]K. Konno and S. Kataoka: An estimating method for the average S-wave velocity of ground from the phase velocity of Rayleigh wave, Journal of JSCE, No. 647/I-51, 415–423 (2000) (in Japanese).[24]H. Arai and K. Tokimatsu: S-wave velocity profiling by joint inversion of microtremor dispersion curve and horizontal-to-vertical (H/V) spectrum, Bull. Seism. Soc. Am., 95 (5), 1766–1778, doi:10.1785/0120040243 (2005).[25]I. Cho, S. Senna and H. Fujiwara: Sophistication of microtremor methods to survey shallow structures, Part I: Development of automatic reading algorithms, Abstracts, Japan Geoscience Union Meeting (2014) (in Japanese).[26]S. Senna, I. Cho, and H. Fujiwara: Sophistication of microtremor methods to survey shallow structures, Part2: Application of automatic reading algorithms, Abstracts, Japan Geoscience Union Meeting (2014) (in Japanese).[27]S. Senna: Sophistication of the cloud type microtremor observation system, Abstracts, Japan Geoscience Union Meeting (CD-ROM) (2015) (in Japanese).[28]P. Wessel and W. H. F. Smith: New, improved version of the Generic Mapping Tools released, EOS Trans. AGU, 79 (47), conducted using seismic waves generated by artificial seismic sources is called the seismic wave exploration.Term 4.Single-point measurement: Measurement conducted using one seismometer. H/V spectrum is the spectral ratio of ground motion in the horizontal and vertical directions obtained in single-point measurement.Term 5.Seismic zoning: A map expression of the seismic hazard and damage of buildings, taking into consideration the ground conditions. The ground conditions include the geomorphological classification that are small-scale undulations that may be difficult to be shown clearly on 1:50,000 scale topographic maps.Term 6.SN ratio: Ratio of the intensities of signal strength to background noise.Term 7.ACT protocol: Autonomous cooperative data transfer (ACT) protocol was developed to stably transfer data for the Metropolitan Seismic Observation network (MeSO-net). Protocol is a set of rules and procedures to mutually transfer information.Term 8.XML: General-use data descriptive language suitable for handling various data on the internet.

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