06 微動計McSEIS-MT NEO の開発と微動探査手法概説 （75～84）
Contents
1. SPAC ESPAC F k CCA 7 9 2 Ya 1 SPAC 10 A B 44 7 4 7 exp 7 7 1 7 0 7 exp 7 7 2 7 2 coh 4 4 4 7 0 7 expt el coh f r 2 3 c f y2. 12 SPAC 1 0 SPAC 1 CCA 1 0 1 1 12 SPAC CCA SPAC 10 W 11 exp 68 7 9
3. 4 3 Hz 1 MEMS 10 Sz es ns Cs os ll i th Gain 1 __ on 01 10 3 10 1 A MI f 1 a 1 UA TT Gain 4 amp LL 001 01 1 10 Hz 2 Fig 2 Frequency characteristics Amplitude of each accelerormeter 0 0008 0 0004 1 MEMS 2 MEMS 0 3 4 0 0004 00008 0 1500 3000 Time sec 3 1 Fig 3 Datain one hour at smallest noise level 1e 008
4. H V SG H V S 2 2 H V H V S H V
5. GA GA Update Layer Model to Minimize Normalized Misfit 8 8 Hi pr Vp1 Vs Hz pz Vpz Vsz Phase Veloclty m s 8 8 Compuied 3 oc Hs ps Vps Vss HIV oo PN Ven Vs 0 2 0 1 1 10 Frequency HZ Compute Phase Velocity and H V Ratio 13 HIV 9 Fig 13 Schematc diagram showing joint mVersion by the use of both phase velocity and H V spectrum McSEIS MT NEO 83 4 McSEIS MT NEO SeisImager MT NEO
6. 2 McSEIS MT NEO 2 1 1 McSEIS MT NEO Ke 2 1 1 McSEIS MT NEO Photo 1 Appearance of McSEIS MT NEO 2 Photo 2 Connector for an external velocity sensor 2 GPS 3 LCD LED
7. SeisImager MT NEO SPAC SPAC McSEIS MT NEO 3 S S McSEIS MT NEO 1 Ublox 2010 Data Sheet LEA 5 u blox 5 GPS Modules 2 Texas Instruments 2009 High Resolution Analog to Digital Converter ADS1282 3 2009 Data Sheet R32C Mn AR 4 2009 CQ 5 Moxa 2011 AirWorks AWK 3121 User s Manual 6 Moxa 200
8. 1 S Sensor Array size Array size a Triangle 4 b Triangle 7 1 Array size C Triangle 10 6 Fig 6 Setup point of the mstrument for Triangle Shaped Array 50m 100m 200m 350m 1000m 4 McSEIS MT NEO SeisImager MT NEO S 7 a e S S PS 8 msec 0 10000 20000 30000 40000 50000 60000 70000 80000 POINT1 PO NNT 2 mp daimiesy essad ny vedrisin for oe i egy shoresd saree ean dior ipo retrorees rear or ts emer mie erthe POINT3 eraneem ponies ar tions nore ron actor rna sie surat rep
9. H V S H V 3 3 S H V P S 13 H V H V S
10. expG 12 p J 29 JF rk f 1 JF rk f gg 1 r c 290 c f 772 pealf 14 CCA 62 No 31 2012
11. 1 0 1 f c 1 4 f c 2z co 6 c 1 0 McSEIS MT NEO 61 11 r p 1 Receivers 11 Fig ll Combinations for calculatng SPAC coefficlent based on extended SPAC method 3
12. 2 c w SPAC _ 1 2 2 rn of lar oe 1 0 SPAC 1 0 c 10 Fig 10 Configuraton of array and plane wave 2 SPAC 4 a 2zr a 76 5 c
13. 4 SeisImager MT NEO SD H V 5 6 LAN 10 1 1 Servo Accelerometer 3ch 1ch Input Signal Connector for Velocity Meter 3ch 1ch IT GPS Wireless LAN Module IF Programmable Gain Amp AZ Modulator Digital Filter Digital IF 1 Memory Card IF SD SDHO Real Time Clock gt USB Port Controller CPU From AC Adaptor
14. 2 5kg LAN 10 80m 9 2 2 MEMS 2 1 2 MEMS 0 3Hz 0 4 Hz 0 1 Hz 2 3Hz 9 11 3 6 1
15. 131 1 2 3 HH V 2 2 3 1
16. S00 TT gt gt G 100 LL 0 1 8 0 8 EE a Jo kr Eq 4 5 0 6 0 4 _ 0 2 Ji kr 0 02 ES 0 4 10m 0 6 10 CC 102 1 Jo kr J kr 0 Eq 13 i 10 10m 2 10 1 10 30 Freduency Hz 12 SPAC CCA PS Phase velocity of Rayleigh waves and graphs of functions appearing on the right hand side of eq 4 and 13 The phase velocity 1s calculated using the model at OYO Tsukuba office 3 2 3 H V H V Horizontal compo nent Vertical component H V
17. 1986 7 265 270 2008 H V 8 64 No 31 2012 30 31 32 33 34 35 36 37 ls 1995 471 61 70 1998 511 69 76 Arai H and K Tokimatsu 2004 S Wave Velocity Profiling by Inversion of Micro tremor H V Spectrum Bull Seism Soc Am 94 53 63 Sanchez Sesma F et al 2010 Site Effects Assessment Using Seismic Noize 9th Int 1 Workshop on Seismic Microzoning and Risk Reduction Mexico 10pages Arai H and K Tokimatsu 2005 S wave Velocity Profiling by Joint Inversion of Micro tremor Dispersion Curve and Horizontal to Vertical H V Spectrum Bull Seism Soc Am 95 1766
18. S McSEIS MT NEO SeisImager MT NEO S McSEIS MT NEO SeisImager MT NEO S McSEIS MT NEO SeisImager MT NEO H V OYO Corporation OYO Corporation 76 No 31 2012 1 McSEIS MT NEO
19. Pk 1 MEMS 2 MEMS NBPSNM 1 3 16 012 4 kk 9 a le 014 1 0 01 1 20 Frequency Hz 4 Fig 4 Power spectrum density 8 No 31 2012 MEMS 0 1 Hz 3 Hz 2 3 McSEIS MT NEO SeisImager MT NEO SeisImager SW McSEIS MT NEO SD SD
20. F k 2 F k BFM Beam Forming Method MLM Maximum Likelihood Method 2 MLM 7 x MLM F k P 7 k PCf k 4 4 fk Gf explik x x 7 4 C gt G explik G amp x x 7 k 8 gt G exptikGx x l m 1 Z NZ A 9 7 97 Cu k 2 F k k c c 2Z7 k 10 4 COCA 19 25 26
21. I I 1 I 4 32bit ADC x 3 Power Supply From AC Adaptor Battery Charger McSEIS MT NEO Fig 1 Block Diagram of McSEIS MT NEO McSEIS MT NEO 7 1 McSEIS MT NEO Table 1 Mam Specification of McSEIS MT NEO 3 1 3 1zG 2 0V G 4G 3ch 1ch ISD SDHC 2GB 4GB 8GB 16GB 2GB 3 15 0 IHz 200Hz 2 4 8 10 20 50 msec A D 32 A D SNR 127dB 10 msec GPS 1PPS 5m 12VDC 7 2Ah 14 AC 5kg
22. Shinozaki 2004 A New Method to Determine Phase Velocities of Rayleigh Waves from Microseisms Geophys lcs 69 1535 1551 Aki K 1957 Space and Time Spectra of Stationary Stochastic Waves with Special ImentS Refterence to Micro tremors Bull Earthq Res Inst Univ Tokyo 415 457 1993 89 44 48 Lacoss R T E J Kelly and M N Toks6z 1969 Estimation of Seismic Noise Struc ture Using Array Geophysics 29 21 38 Capon 1969 High Resolution Frequency Wave number Spectrum Analysis Proc IEEE 57 1408 1418 Horike M 1985 Inversion of Phase Velocity of Long Period Microtremors to the S Wave Velocity Structure down to the Basement in Urbanized Areas J Phys Earth 33 59 96 Cho I T Tada and Y Shinozaki 2006 Centerless Circular Array Method Inferring Phase Velocities of Rayleigh Waves in Broad Wavelength Ranges Using Microtremor KRecords J Geophys Res 111 B09315 Tada T I Cho and Y Shinozaki 2007 Be yond the SPAC Metohd Exploiting the Wealth of Circular Array IMethods for Micro tremor Exploration Bull Seism Soc Am 97 2080 2095 Tada T I Cho and Y Shinozaki 2009 New Clrcular Array Microtremor Techniques to Infer Love Wave Phase Velocities Bull Selsm Soc Am 99 2912 2926
23. 1778 1982 1995 468 9 17 2007 60 sh
24. H V LAN McSEIS MT NEO 5 McSEIS MT NEO 3 SeisImager MT NEO H V H V SeisImager MT NEO lt 30 5 H V Fig 5 Observatlon data and H V spectrum 6 4 7 10
25. vom en rte sangre ne POINT4 McSEISMT NEO0909193040 0014 sg2 7 a 200m Fig 7 a Example of observed data by Triagnle4 Array size js 200 m Source 0 0m Frequency Hz 0 1 2 3 4 5 6 7 8 9 10 Distance m 7 b Fig 7 b Coherence McSEIS MT NEO 79 Source 0 0m Phase Velocity m sec 0 200 400 600 800 1000 1200 1400 1600 1900 2000 Frequency Hz Dispersion curve McSEISMT NEO_0909213600 0000 sg2 McSEISMT NEO_0909213600 0046 sg2 7c Fig 7 c Image of Phase Velocity Frequency m sec Phase velocity m sec 7 d Fig 7 d Dispersion curve comparison between observed value and theoretical one S wave velocity m s 0 500 1000 1500 2000 2500 3000 S wave velocity model inverted tsukuba all_inverted result 4 rst 7 e SeisImager MT NEO Fig 7 e Analysis of Microtremor Array by SeisImager MT NEO S wave velocity m s CD 1500 2000 2500 3000 3500 1 ee lt MT NEO PS Logging 500 0 0 200 1 300 E so eoo 700 8 PS McSEIS MT NEO Fig 6 Comparison of S Wave Velocity Profile between gettng
26. 5 McSEIS MT NEO Development of New Instrument McSEIS MT NEO for Microtremor Measurement and Summary ot Microtremor Exploration Tomoichi Okaya Haruhiko Suzuki and Hiroto Nakagawa Abstract It is well known that the evaluation of dynamic characteristics of ground ie site effect is one of the key components when considering earthquake disaster prevention or multigation In order to evaluate the site effect it is important to obtain the S wave velocity profile There are number of methods e g seismic reflection refraction method available that are used for this purpose Among others microtremor measurement is one ot the most popular ways and has been conducted extensively because of its cost effectiVeneSS There are several methods to get geophysical information from the microtremor measurement Major methods are 1 obtaining the phase velocity by array observation of microtremor and 2 obtaining H V SDectrum by using a single three component sensor After obtaining the phase velocity or H V spectrum we can interpret S wave velocity profile by applying an InVerse analys1s OYO has developed a new instrument and software called McSEIS MT NEO and SeisImager MT NEO for the purpose of conducting three components of microtremor exploration and interpreting S wave velocity profile We thmk that this newly deve
27. 7 NPort W2150 2250 Plus Se ries User s Manual 7 2009 8 COLIBRYS 2009 DataSheet SF1500SA SF1500NA 9 SILICON DESIGNS INC Data Sheet Model 1221 10 2008 TA 25E 05 10 11 2005 JA 40GA04 12 2006 No 29 14 JA 40GA 13 1993 2 46 343 350 14 1998 4 193 225 15 Bard P Y 1999 Microtremor Measure 16 17 18 19 20 21 22 23 24 25 26 27 28 29 A Tool for Site Effect Estimation Proc the Effects of Surface Geology on Seis mic IMotion Irikura Kudo Okada amp Sasatan eds 1251 1279 Asten M W 2006 On Bias and Noise in Passive Seismic Data from Finite Circular Array Data Processed Using SPAC Methods Geophysics 71 V153 V162 2008 61 445 456 2000 Cho L T Tada and Y
28. from McSEIS MT NEO and PS Logging 2 4 McSEIS MT NEO LAN 9 McSEIS MT NEO 4 LAN McsEIS MT NEO LAN 2 L NM a 4 2 er ees re HI 2 HH WW lt FE x e PC 9 LAN Fig 9 Connecton by Wrreless LAN SeisImager MT NEO LAN PC McSEIS MT NEO 1 2 PC 3 PC 4 9 LAN 60 No 31 2012 3
29. loped system will become one ot the effectve equupment for conductng microtremor exploration more easlly and accurately Keywords McSEIS MT NEO SeisImager MT NEO Microtremor Phase Velocity H V Spectrum he S oe 3 McSEIS MT NEO 1 2 3 H V 2 H V
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