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1. 2 n n 8E x W 1 Dziewonski A M T A Chou and J H Woodhouse 1981 Determination of earthquake source paramete2. Wielandt and Streckeisen 1982 STS 1 STS 1 Roult and Romanowicz 1984 POSEIDON 1988 1989 Kanamori 1989 STS 1
3. CU 4 3 Th STS 1 1 nity TYM
4. core phase 1 2 1 Dzeiwonski et al 1981 Kawakatsu 1989
5. E x S E FEE w E gt o go gt F 8 3 2 5 LED 9 9 38 7 2 9 Y 9 gE P o 1 A 04 1 10 100 1000 Li 04 1 10 100 1000 Period s Period s a b 1 STS 1 BRB a b Fig 1 Frequency dependence of the BRB output of the STS 1 seismometer a Ampli tude response b Phase response 2 2 1 STS 1 STS 1 BRB j LP 1 Fig 1 BRB 0 1 360
6. STS 1 BRB LP 2 H LP AD LP ADC 9600bit RS 422 RS 232 gt SH 1 B 1 28MB ELE EXABYTE EXB 8200
7. EMBL RI OBES Z em LEBTTORMLA C2 STS 1 STS 46 1990 12 COL SGN OX t Uc X
8. F 1989 STS 1 20 360 TYM SGN 360 2 3 Fig 2 STS 1 STS1V VBB STS1H VBB FB AQ220 AQ240 CRSXQ52K 24bitAD PS B PC9801CV EXB8200 S BU502 Block diagram of the recording system for the iB broadband seismic observation STSIV VBB Sensor of a vertical component STSIH VBB Sensor of a horizontal component FB Feed back box AQ220 AQ240 Clock pulse genera tor CRSXQ52K 24 bit digitizer PS Power supplying device B Batt
9. 2 42 21 31 1990 8 20 EJ m
10. STS 1 1989 7 M5 5 TYM STS 1 Fig 3 STATION TYMS Date 19890709 Time 110918 Number of dala points 3601 11h09m JUL 9 1989 20 30 ao so or Ls a wx 10 20 30 aor SH oo io T T T T T T T T T T T T n W m jid I MA etry Ae M Rr Up i ln z ih Wi MAYA j i M M Ni Min MM AM AN Ne I Ad M a a MD I i P a 1 1 1 c 1 1 1 1 1 1 1 1 1 1 E C S RE C CREE CRECEN NE E RN NC ONE E F Thogm JUL 9 1989 STATION TYM Dale 19890709 Time 110919 Number of dala poinls 1440l IIh09m JUL 9 1989 20 Ot aor ao nor 2 aoe dot Se or nor 20t or sor so or ae T T t T T T T T T T TNT ME m m fr MM W desti mM WM ql l EN NS Mi is MM P ip 1 EW TH b Finom JUL 9 1089 5 3 1989 7 9
11. ADC 1 15V OF KYAT SGN JJY ADC TYM NHK ESTE COR CRE KR 10 JJY SANE SEA SGN 1 xs day C 2 ms day 3 1 20 v 3 ADC b
12. 1 100 EX X LP 100 RAO AIG E CIRE Ht amp b TH 2 BRB 140dB 5 mm s 1 78dB 1982 1 000 2 2 STS 1 STS 1 TYM SGN
13. M5 5 a STS 1 b Fig 3 Seismic records of the largest event M5 5 of the swarm off the east of Ito on July 9 1989 a Seismogram recorded by the STS 1 seismometer b Seismo gram recorded by the high sensitivity sensor Units of the amplitude are ms and digit for Figs 3a and 3b respectively MB Dr 3 mi 3 400E 03 1 000E 6 ns 3 S00E 03 ms 4 B 40CE 03 digit a a Dm 8 400E 03 dig a b UD EW 46 1990 12 STATION TYMS Date 19900601 Time 102219 Number of dala points 4800 10h22m JUN 1990 20 30 40 sot OF 10 20 x kor Tete Ee et here rie e or or 20 3 TFTT so 40 so or ao EITT Bet E a i MUR E W M JW MAPA tan rop Uv Lid Mi irte IM PW eer PS ftd i i L 1 1 1 1 ee a St 1 LxcLa 1 i Jit 1 1 1 1 1 1 20 30 aor SOF OF Ioe 2 OF ag S lO 2 ao oo so OF io 2 3 4 so Or uo 10h22m JUN 1 1990 STATION SGNS Date 19900601 Time 102219 Number of dale points 4801 10h22m JUN 1990 ww roe oo ar ee we e f T T T T T T rs 2 i ETT TT T T T T T T i j TNNT Up iW hi MM li TW vd PA au FISH PS INI A as A LULA M 1 1 1 1 1 i EN yi Tm eni MM ry
14. APE Analyzing System for Precursors of Earthquakes 1988 1988 Obara and Sato 1988 Hori 1990 1 D
15. 46 1990 12 550 34 03 681 3 02 m Ae Broad Band Seismic Observation by the National Research Institute for Earth Science and Disaster Prevention by Sadaki Hori National Research Institute for Earth Science and Disaster Prevention Abstract Since early 1989 a very broadband seismographic system has been in operation at several seismic stations within the Kanto Tokai network of the National Research Institute for Earth Science and Disaster Prevention The system cons of a Streck eisen 1 broadband sensor STS 1 and several devices for data acquisition The STS 1 seismometer is equipped with three component BRB BRoadBand outputs correspond ing to ground velocity in a dynamic range of about 140 dB and LP Long Period outputs corresponding to ground acceleration The BRB output is digitized by the Quanterra Q52K 1 24 bit AD converter at a sampling interval of 0 05 s The Q52K 1 digitizer can produce precise timing information by receiving pulses from the external clock synchron ized to JJY or NHK clock signals The data stream including a clock string as a header created by Q52K 1 is received by a personal computer PC9801 and recorded continu ously on 8 mm cartridge tape EXB8200 The large capacity of the tape about 2 GB volume ensures the storage of the data for a
16. 41 35 44 9 Obara K and H Sato 1988 Existence of an S wave reflector near the upper plane of the double seismic zone beneath the southern Kanto district Japan J Geophys Res 93 15037 15045 10 POSEIDON 1988 POSEIDON No 1 54 11 Roult G and B Romanowicz 1984 Very long period data from the GEOSCOPE network preliminary results on great circle averages of fundamental and higher Rayleigh and Love modes Bull Seismol Soc Am 74 2221 2243 44 46 1990 12 12 Satake K and Kanamori H 1990 Fault parameters and tsunami excitation of the May 23 1989 Macquarie Ridge earthquake Geophys Res Lett 17 997 1000 13 MER BRE 1989 WPA No 2 254 14 Tichelaar B W and L J Ruff 1990 Rupture process and stress drop of the great 1989 Macquarie Ridge earthquake Geophys Res Lett 17 1001 1004 15 Wielandt E and G Streckeisen 1982 The leaf spring seismometer design and performance Bull Seismol Soc Am 72 2349 2367 16 1989 STS
17. Z 1 20 Fig 6 1990 5 12 M6 5 10 TYM SGN SGN OS TYM Fig 7a ld 1989 5 23 New Zealand Macquarie Ridge M8 2 TYM
18. P STS 1 S NS S OCHS Fig 4 Fig 5 iX 19904 FE 6 1 M6 0 M 46 1990 12 STATION TYMS Date 19900512 Time 135159 Number of data points 12000 MAYI2 Jo E se se s o n IYTUCILTI Spe T T T 1 pene Bep ipto we JAN Apte gno didi Nr WM VAM fe Ae UD NS 52 53 E 58 se o n 13h MAYI2 1990 STATION SGNS Date 19900512 Time 135159 Number of dala points 12001 E MAYI2 1990 53 Sut 55 sen s 58 Ld o js T T T T E d 4 3 sen f Vtt JM Ate pr Aves ul PAP Pede A Paar SES 1 EW pr Mesi Aa b Li 1 1 wees were 1 isl 1 Li 1 J 52 53 EJ 55 56 57 se E or EH 13h MAYI2 1990 6 1990 5 H12H EIA U VCRE LER M7 7 m 6 5 a TYM b SGN Fig 6 Seismic records of the deep event M7 7 m 6 5 beneath the Sakhalin Island a Record section at TYM b Record section at SGN OE 03 ms 03 ms 2 700E 5T
19. 1 EXB 8200 Gulf 1 1 1 1 2 1 1 BO
20. EXB 8200 8 mm STS 1 BRB ERA Bes ADC BR Lig ADC BRB H B u d Zum EC 1 46 1990 12 2 GE 246KB ADC EXB 8200 70 ADC RS 232 EXB 8200 NEC PC9801 N88BASIC MS DOS
21. b 1000 4 TOR STS_1 Fig 9 1990 2 20 x me 46 1990 12 STATION TYMS Date 19900220 Time 155339 Number of data points 9600 15h Fee 1990 s se 3 E ry T my 3 de li AI ete WW NN ANA MA NASA foe ann WAV ww NS m MM MM AAM ed us AM E WM ab Antik 3 x MM iN Mi IAM WM Ae pantalla ey 19 1 1 1 1 1 s E E o g
22. 15h Bao 1990 9 1990 2 20 M6 5 TYM Fig 9 Record section of the Izu Oshima Kinkai earthquake M6 5 on February 20 1990 recorded at TYM M6 5 70km TYM S EF SGN
23. ve PH iere eI te Lib kLi la c ica 20 30 40 so o Io zO 30 10h22m JUN 1 1990 Lupa at a La4 T 40 50 ov 10 20 30 o 4 1990 6 1 M6 0 a TYM STS 1 b SGN STS 1 Fig 4 Seismic records of the event M6 0 which occurred beneath Choshi on June 1 1990 a Record section at TYM b Record section at SGN 03 ms 1 200E 02 ms 6 400E 1006 02 ms 1 700E 03 ms 1 700E 03 ms 8 500E 03 ms STATION TYM 90 06 01 10 22 40 90 06 01 10 24 39 10 10 lot POWER DENSITY toe 105 mr 1 lo ig jg 10 108 107 s STATION SGN 90 06 01 10 22 50 2 5 105 FREQUENCY HZ 3 90 06 01 10 24 49 to 103 102 PONER DENSITY 10 107 10 10 1979 io to qg 2 io b NA AM Ny NM UL 5 Fig 5 4 S Power spectra of the S cod b SGN 2 3 5 10 o FREQUENCY HZ a TYM b SGN a wave indicated by broken lines in Fig 4 a TYM Bi
24. 3 10 Fig 7b 10 6 M 1 5 2 5X1021Nm Ekstr m and Romanowicz 1990 Satake and Kanamori 1990 Tichelaar and Ruff 1990 10 TYM STS 1 BRB R1 R2 Gl G2 Fig 8a Fig 8b iX transverse 1 5mHz spheroidal toroidal STS 1 360 BRB
25. 500F 03 ms 4 400E 04 ms 2 p ms a 390E 04 ms 6 STATION TYMS Number of dala points IO8I 19h MAY23 1989 om i0 20 3X so sot Dale 19890523 Time 195957 T T T T T T RI NS 4 hr G1 m APA canal M ae aA anaana a Lui iwl EEE oda doe Tox oed a 1 O ion 25 3 ab S ov lo 2 3 49 Sw i er X do S0 19h MAY23 1989 STATION TYMS Number of data points 2161 19h MAY23 1989 Date 19890523 Time 195957 TORRE 1 LAMPES Ee Re R3 M l M dian wai ew NIA MW Ly li T m ran MNA n NM MM Minis VU Hess onde W W ane G1 G2 ae li Mme Me URI b VEUIUICIUITXCETICLOYCX CROCI IY ERTULITI YCY QN D POY I ED rcd Ton MAY23 1989 7 a 1989 5 23 Macquarie Ridge VI8 2 TYM 3 b HHO 6 10 Fig 7 a Seismic records 3h of the 1989 Macquarie Ridge earthquake M 8 2 recorded at TYM The amplitude scale is normalized by the maximum amplitude b Seismic records 6h of the same event as Fig 7a The amplitude scale is ten times exaggerated 39 3 700E
26. period of about 70 days The STS 1 seismometer is installed at the base where a high sensitivity sensor for microearthquake observation and a middle period sensor for strong motion observation have already been installed The high sampling rate and continuous broadband seismic data enables us to determine the precise features of source processes of earthquakes Key words brobdband seismic observation data processing system 29 46 1990 12 1 44 53 5 1982
27. 04 ns 3 400F 04 ms amp 500E 04 ms 3 700E 05 ms 3 400E 05 ns 509E 05 ns 4 a b 8 Fig 8 46 1990 12 Stalion TYM Component Verlica 2 50E 05 t 5 s oss ona os 9 os J osig 08 1 87E 05 FOURIER AMPLITUDE 1 25E 05 6 25E 06 el ep 8 3 o FREQUENCY mHz i Station TYM Componenl Transverse 8 w S e a ia eo w o us m e c E 5 aw 2 p 5e E 5 u D 8 u o S wn o S hi LU E 3 00 FREQUENCY mHz 7 1 3 EFE b transverse Amplitude spectra of the 1989 Macquarie Ridge earthquake a Vertical com ponent for spheroidal modes b Transverse component for toroidal modes Broken lines indicate the theoretical eigenfrequencies of the Earth s free oscilla tions 49 S 120 TYM SGN 10
28. ery unit for PS PC9801CV Personal computer EXB8200S AC power supplying device Se I Data recording device DU502 STS 1 Quanterra 24bit AD EH WHS 1989 1989 AD Quanterra 24bit Fig 2 BS LIEV AF ARE D Fig 2 CRSXQ52K Quanterra AD H STS ADC 24V
29. rs from waveform data for studies of global and regional seismicity J Geophys Res 86 2825 2852 2 Ekstr m G and B Romanowicz 1990 The 23 May 1989 Macquarie Ridge earthquake a very broadband analysis Geophys Res Lett 17 993 996 3 1982 2 35 401 426 Hori S 1990 The seismic waves guided by untransformed oceanic crust subducting into the mantle the case of the Kanto district central Japan Tectonophys 176 335 376 5 1988 41 129 136 6 Kanamori H 1989 A slow seismic event recorded in Pasadena Geophys Res Lett 16 1411 1414 7 Kawakatsu H 1989 Centroid single force inversion of seismic waves generated by landslides J Geophys Res 94 12363 12374 8 1989
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