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3 REPORT OF HYDROGRAPHIC AND OCEANOGRAPHIC RESEARCHES JAPAN COAST GUARD TOKYO, JAPAN Older issues

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5 Azusa NISHIZAWA, Tomozo ONO, Noboru SASAHARA, Hiroshi HASHIGUCHI and Yasuo OTANI Shikoku Basin Ridge Myojin-sho Shichito- Iwo-jima Ogasawara Trough Ogasawara Ridge Izu-Ogasawara Trench Kaitoku Smt. Pacific Ocean Funka-Asane Kita-Fukutoku Tai 24 Fukutoku-okanoba Minami-Hiyoshi Smt. Nikko Smt. 22 Parece Vela Basin

6 23 35' 23 30' 23 45' 23 40' 23 55' 23 50' Ocean Bottom Seismographic Observation at Minami-Hiyoshi Seamount at the Northern End of the Mariana Arc depth(km) ' ' ' ' ' ' ' ' Kita-Hiyoshi Smt. Naka-Hiyoshi Smt. Minami-Hiyoshi Smt ' 23 25' depth,km ' ' 'E 'E 'E 'E 'E 23 40' 23 40'N 23 40'N 23 35'N 23 35'N 23 30' 23 30'N 23 30'N 23 25'N 23 25'N 23 20' 23 20'N 23 20'N ' ' 'E 'E 'E 'E 'E km depth(km) Sidescan

7 Azusa NISHIZAWA, Tomozo ONO, Noboru SASAHARA, Hiroshi HASHIGUCHI and Yasuo OTANI km File khiyoss02_mosaic.grd - Sidescan Grid ' ' 'E 'E 'E 'E 23 55'N 23 50' 23 50'N 23 45'N 23 40' ' ' 'E 'E 'E 'E 23 40'N Sidescan

8 09:00 8/6 23:00 Ocean Bottom Seismographic Observation at Minami-Hiyoshi Seamount at the Northern End of the Mariana Arc ' ' ' Kita-Hiyoshi Smt. airgun ' 17:00 16:00 Naka-Hiyoshi Smt ' 18:00 19:00 Line2 21:00 20:00 19:00 15:00 22:00 20:00 MH6 MH7 14:00 MH8 23:00 MH10 MH2 21:00 16:00 13:00 MH4 15:00 MH9 13:00 00:00 8/7 12:00 14:00 22:00 11:00 MH1 12:00 10:00 MH3 01:00 11:00 02:00 10:00 03:00 Minami-Hiyoshi Smt. Line4 MH5 00:00 8/8 Line3 09:00 04:00 08:00 06:00 05:00 07:00 18:00 Line1 17: ' km ' ' depth, km

9 Azusa NISHIZAWA, Tomozo ONO, Noboru SASAHARA, Hiroshi HASHIGUCHI and Yasuo OTANI Line1 MH1 SSW NNE NW Line3 MH1 SE MH9 MH3 MH7 MH2 MH5 WSW Line2 MH6 MH6 MH4 MH1 ENE Two way travel time (s) Two way travel time (s) Two way travel time (s) 10 km 10 km 10 km Line4 W MH8 MH1 E 10 km Two way travel time (s)

10 Ocean Bottom Seismographic Observation at Minami-Hiyoshi Seamount at the Northern End of the Mariana Arc Line1 Line2 MH9 MH6 Line3 MH7 MH1 MH1 MH4 MH2 MH5 MH3 MH1 NW SE NW Line4 MH8 MH1 SSW NNE WSW ENE W E W SE E

11 Azusa NISHIZAWA, Tomozo ONO, Noboru SASAHARA, Hiroshi HASHIGUCHI and Yasuo OTANI

12 Ocean Bottom Seismographic Observation at Minami-Hiyoshi Seamount at the Northern End of the Mariana Arc SSW NNE WSW 60 ENE DEPTH (km) DEPTH (km) T-D/6 (s) MH MH DISTANCE (km) DEPTH (km) DISTANCE (km) DEPTH (km) T-D/6 (s) T-D/6 (s) MH1 MH T-D/6 (s) DISTANCE (km) DISTANCE (km) DEPTH (km) T-D/6 (s) MH Fig DISTANCE (km) MH T-D/6 (s) DEPTH (km) 60 0 Ray diagrams (top) and comparison between DISTANCE (km) 40 Fig. 9 Same as Fig. 8 but for Line 2. observed and calculated travel times for each OBS along Line 1 (bottom). The observed travel times are indicated by vertical bars and the calculated ones by lines. The reduction velocity is 6.0 km/s

13 DEPTH (km) DISTANCE (km) T-D/6 (s) DISTANCE (km) T-D/6 (s) DEPTH (km) DISTANCE (km) T-D/6 (s) DISTANCE (km) T-D/6 (s) MH8 MH1 W E DEPTH (km) DISTANCE (km) T-D/6 (s) DISTANCE (km) T-D/6 (s) DEPTH (km) DISTANCE (km) T-D/6 (s) DISTANCE (km) T-D/6 (s) DEPTH (km) DISTANCE (km) T-D/6 (s) DISTANCE (km) T-D/6 (s) DEPTH (km) DISTANCE (km) T-D/6 (s) DISTANCE (km) T-D/6 (s) MH7 MH2 MH1 MH5 SE NW SE NW Azusa NISHIZAWA, Tomozo ONO, Noboru SASAHARA, Hiroshi HASHIGUCHI and Yasuo OTANI

14 Ocean Bottom Seismographic Observation at Minami-Hiyoshi Seamount at the Northern End of the Mariana Arc Line1 Line2 MH9 MH6 Line3 MH7 MH1 T-D/6 (s) T-D/6 (s) T-D/6 (s) T-D/6 (s) T-D/6 (s) T-D/6 (s) T-D/6 (s) T-D/6 (s) MH1 MH DISTANCE (km) MH4 MH1 DISTANCE (km) SSW NNE WSW ENE NW MH2 MH5 DISTANCE (km) DISTANCE (km) SE DISTANCE (km) T-D/6 (s) Line4 W MH8 E NW W MH1 DISTANCE (km) SE E

15 Azusa NISHIZAWA, Tomozo ONO, Noboru SASAHARA, Hiroshi HASHIGUCHI and Yasuo OTANI 0 SSW D e p t h (km) MH ?? MH3 Line1 5 6? NNE MH1 0 WSW MH4 1 Line2 ENE 2 2 MH ?? D i s t a n c e (km) D e p t h (km) MH1 NW D e p t h (km) D e p t h (km) MH7 MH MH5 Line W MH1 0 E 1 MH8 Line ? D i s t a n c e (km) MH P wavespeed (km/s)? SE

16 Ocean Bottom Seismographic Observation at Minami-Hiyoshi Seamount at the Northern End of the Mariana Arc 2001 Aug.5 horizontal component 2001 Sep.7 MH1 MH5 MH1 MH5 horizontal component MH2 MH6 MH6 MH3 MH7 MH3 MH7 MH4 MH9 MH4 MH9

17 Azusa NISHIZAWA, Tomozo ONO, Noboru SASAHARA, Hiroshi HASHIGUCHI and Yasuo OTANI 2001 Aug.5 MH8 horizontal component 5-30HzBPF 2001 Sep.7 MH8 5-30HzBPF 2001 Sep.8 MH1 horizontal component 23-24h

18 Ocean Bottom Seismographic Observation at Minami-Hiyoshi Seamount at the Northern End of the Mariana Arc N 100 MH1 100 MH N MH MH6 N ~126 MH MH7 N MH MH S-P time (sec) S-P time (sec)

19 Azusa NISHIZAWA, Tomozo ONO, Noboru SASAHARA, Hiroshi HASHIGUCHI and Yasuo OTANI MH1V MH4V MH3V MH3H MH6V MH5V MH2V MH9V MH7V 1sec ' ' Kita-Fukutoku Tai ' ' Fukutoku-okanoba ' 26 Fukutoku-okanoba Minami-Hiyoshi Smt. Nikko Smt. 24 Kita-Hiyoshi Smt ' Minami-Hiyoshi Smt ' 23 00' Nikko Smt ' ' ' '

20 :00 13:00 14:00 7/5 99fuku07 11:00 15:00 11:00 16:00 12:00 10:00 10:00 7/4 13:00 21:00 14:00 99fuku04 03:00 99fuku05 02:00 7/5 15:00 04:00 20:00 05:00 06:00 17:00 99fuku06 09:00 19:00 08:00 7/5 18: airgun1 08:30 8/6 09:00 16:30 09:30 16:00 17:00 15:30 10:00 15:00 04:30 05:00 04:00 05:30 14:30 17:30 03:30 10:30 03:00 14:00 06:00 02:30 11:00 13:30 02:00 18:00 01:30 13:00 01:00 11:30 12:30 06:30 22:30 13: :30 22:00 18:30 13:30 21:00 20:30 19:00 00:30 00:00 8/8 23:30 23:00 21:30 20:00 19:30 12:00 00:00 8/7 12:00 12:30 23:30 11:30 14:00 23:00 07:00 11:00 22:30 14:30 22:00 10: : :00 21:00 07:30 15:00 20:30 09:30 20:00 09:00 15:30 19: :00 08:30 16:00 19:00 18:30 16:30 18:00 17:30 17: Ocean Bottom Seismographic Observation at Minami-Hiyoshi Seamount at the Northern End of the Mariana Arc 25 00' 24 30' 24 00' 23 30' 23 00' ' ' km Line ' Iwo-jima ' Kita-Fukutoku Tai Line3 Line1 Line2 Line2 Line4 GMT 2002 Dec 5 16:51:29 /export/home6/hiyoshi/topo/nmariana_wgs84.grd -Jm1: ' Fukutoku-okanoba Minami-Iwo-jima Line1 Line ' Mt. Fuji ' Nikko Smt. Minami-Hiyoshi Smt ' depth(km) 1999 Fukutoku-okanoba submarine volcano Line1 W E MH ? 5 6? D e p t h (km) SSW Line1 NNE WSW MH4 ENE MH D e p t h (km) FK2 Line D i s t a n c e (km) FK MH1 MH1 NW MH7 Line3 SE 1 MH2 MH3 MH5 D e p t h (km) MH1 FK4 FK5? W 0 MH1 E Line MH D e p t h (km) D e p t h (km) D i s t a n c e (km) Line2 W E FK7 FK D e p t h (km) D i s t a n c e (km)?? Line3 SSW NNE FK6 FK3 FK D e p t h (km) 5 FK1 FK4? D i s t a n c e (km) FK9 D e p t h (km)???? 2001 Minami-Hiyoshi Seamount Line4 NNW SSE???? D i s t a n c e (km)? D i s t a n c e (km) P wavespeed (km/s)

21 Azusa NISHIZAWA, Tomozo ONO, Noboru SASAHARA, Hiroshi HASHIGUCHI and Yasuo OTANI Phys. Earth Planet. Int

22 Ocean Bottom Seismographic Observation at Minami-Hiyoshi Seamount at the Northern End of the Mariana Arc Geophys. Res. Lett Geophys. Res. Lett Can. J. Explor. Geophys 24

23

24 Ken-ei ONODERA, Tsuyoshi KATO, Noritsune SEO

25 Crustal Structure in the Vicinities of Fukutoku-okanoba Submarine Volcano Estimated from Gravity and Magnetic Anomalies

26 Ken-ei ONODERA, Tsuyoshi KATO, Noritsune SEO

27 Crustal Structure in the Vicinities of Fukutoku-okanoba Submarine Volcano Estimated from Gravity and Magnetic Anomalies

28 Ken-ei ONODERA, Tsuyoshi KATO, Noritsune SEO

29 Crustal Structure in the Vicinities of Fukutoku-okanoba Submarine Volcano Estimated from Gravity and Magnetic Anomalies

30 Ken-ei ONODERA, Tsuyoshi KATO, Noritsune SEO

31 Crustal Structure in the Vicinities of Fukutoku-okanoba Submarine Volcano Estimated from Gravity and Magnetic Anomalies Jour. Geophy. Res. 93 Geol. Soc. Am. Bull 84

32

33 Minoru Odamaki, Yukihiro Ooniwa and Noriaki Shibata

34 Comparative Tidal Current Observation in Ariake Bay with the Previous Results

35 Minoru Odamaki, Yukihiro Ooniwa and Noriaki Shibata

36 Comparative Tidal Current Observation in Ariake Bay with the Previous Results

37 Minoru Odamaki, Yukihiro Ooniwa and Noriaki Shibata

38 Comparative Tidal Current Observation in Ariake Bay with the Previous Results

39 Minoru Odamaki, Yukihiro Ooniwa and Noriaki Shibata

40 Comparative Tidal Current Observation in Ariake Bay with the Previous Results

41 Minoru Odamaki, Yukihiro Ooniwa and Noriaki Shibata

42 Comparative Tidal Current Observation in Ariake Bay with the Previous Results

43 Minoru Odamaki, Yukihiro Ooniwa and Noriaki Shibata

44 Comparative Tidal Current Observation in Ariake Bay with the Previous Results

45 Minoru Odamaki, Yukihiro Ooniwa and Noriaki Shibata

46 Comparative Tidal Current Observation in Ariake Bay with the Previous Results

47 Minoru Odamaki, Yukihiro Ooniwa and Noriaki Shibata

48 Comparative Tidal Current Observation in Ariake Bay with the Previous Results

49 Minoru Odamaki, Yukihiro Ooniwa and Noriaki Shibata

50 Comparative Tidal Current Observation in Ariake Bay with the Previous Results

51 Minoru Odamaki, Yukihiro Ooniwa and Noriaki Shibata

52 Comparative Tidal Current Observation in Ariake Bay with the Previous Results

53 Minoru Odamaki, Yukihiro Ooniwa and Noriaki Shibata

54 Comparative Tidal Current Observation in Ariake Bay with the Previous Results

55 Minoru Odamaki, Yukihiro Ooniwa and Noriaki Shibata

56 Comparative Tidal Current Observation in Ariake Bay with the Previous Results

57 Minoru Odamaki, Yukihiro Ooniwa and Noriaki Shibata

58 Comparative Tidal Current Observation in Ariake Bay with the Previous Results

59 Minoru Odamaki, Yukihiro Ooniwa and Noriaki Shibata

60 Comparative Tidal Current Observation in Ariake Bay with the Previous Results

61

62 Yasuhiko OHARA

63 Reviews on mantle peridotites from the Philippine Sea backarc spreading systems

64 Yasuhiko OHARA

65 Reviews on mantle peridotites from the Philippine Sea backarc spreading systems

66 Yasuhiko OHARA

67 Reviews on mantle peridotites from the Philippine Sea backarc spreading systems

68 Yasuhiko OHARA

69 Reviews on mantle peridotites from the Philippine Sea backarc spreading systems

70 Yasuhiko OHARA

71 Reviews on mantle peridotites from the Philippine Sea backarc spreading systems

72 Yasuhiko OHARA

73 Reviews on mantle peridotites from the Philippine Sea backarc spreading systems

74 Yasuhiko OHARA

75 Reviews on mantle peridotites from the Philippine Sea backarc spreading systems é

76 Yasuhiko OHARA í é

77 Reviews on mantle peridotites from the Philippine Sea backarc spreading systems

78 Yasuhiko OHARA í

79 Reviews on mantle peridotites from the Philippine Sea backarc spreading systems

80 Yasuhiko OHARA

81 Reviews on mantle peridotites from the Philippine Sea backarc spreading systems

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