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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 Fukutoku-okanoba Minami-Hiyoshi Smt. Nikko Smt. Parece Vela Basin -. -. -. -. -. -..

' ' ' ' ' ' 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. ' ' -. -. -. -. -. -.. depth,km ' ' 'E 'E 'E 'E 'E ' 'N 'N 'N 'N ' 'N 'N 'N 'N ' 'N 'N ' ' 'E 'E 'E 'E 'E km -. -. -. -. -. -.. depth(km) - 9 99 7 9 9 9 7 9 Sidescan

Azusa NISHIZAWA, Tomozo ONO, Noboru SASAHARA, Hiroshi HASHIGUCHI and Yasuo OTANI km File khiyoss_mosaic.grd - Sidescan Grid ' ' 'E 'E 'E 'E 'N ' 'N 'N ' ' ' 'E 'E 'E 'E 'N -. -. -. -. -. -.. -7 7 99 799 7 Sidescan

9: / : Ocean Bottom Seismographic Observation at Minami-Hiyoshi Seamount at the Northern End of the Mariana Arc ' ' ' Kita-Hiyoshi Smt. airgun ' 7: : Naka-Hiyoshi Smt. ' : 9: Line : : 9: : : : MH MH7 : MH : MH : : : MH : MH9 : : /7 : : : : : : : : : : : Minami-Hiyoshi Smt. Line MH : / Line 9: : : : : 7: : Line 7: ' km ' ' -. -. -. -. -. -.. depth, km

Azusa NISHIZAWA, Tomozo ONO, Noboru SASAHARA, Hiroshi HASHIGUCHI and Yasuo OTANI Line SSW NNE NW Line SE MH9 MH7 MH MH WSW Line MH MH MH ENE Two way travel time (s) Two way travel time (s) Two way travel time (s) km km km Line W MH E km Two way travel time (s)

Ocean Bottom Seismographic Observation at Minami-Hiyoshi Seamount at the Northern End of the Mariana Arc Line Line MH9 MH Line MH7 MH MH MH NW SE NW Line MH SSW NNE WSW ENE W E W SE E

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

Ocean Bottom Seismographic Observation at Minami-Hiyoshi Seamount at the Northern End of the Mariana Arc SSW NNE WSW ENE..................................................................................................................................................................................77.......7.......................................7.7.7.7........9..........................9..9..................................9.9.9..9.9.9..7...9......7.....................................9.9.........9.9..................7.7.9.9.9.9.......7.7.9.9......7.7.9.9....... 7. 7. 7.....................7...7.7.7.7.7........ 7. 7...9.............9.9..9..........7.7.7.7...7.7.7.....9.....9...........7.7.......................9.9................................................................97....7........................9.9.....9..97.........9.9......9..7...................................9.............7.7............................9...7...........9...........9.9.....9..97...........................................................7....97...........................................7.7.....9........................9.9........9.9.........7.7.9.9......7.7.9.9......7.9....................................7.....7..............7..9..9......9........7.9......7.9....9....7...9................9..............7......7.7.9................7.....97.97.............9.....77...9..........7..........9......7.9...9......7.7......7........................................................... 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7.. T-D/ (s)..... MH... MH9.......................................................................................................................................................77...........7............7...............................................7.7.7.7...7.....9..........................9.9.9.........7.7................9.7.9.....9.7....7............................................9.9................7.7.9.9.9.9....7.7.9.9........7.7.7.9.9.................7...........................9.9........9....7.7..7...7.7.............9.9..9........7.7.7.7...7.7...7.7.7..........9.....9...............7.7....9.............................7.7....9.................................................................7.......................9.9..97.97....9........9.9.........9.7...................................9.............7.7..........................9.9...7.........9................9.9.......................................................................7.....97.........97........................9..........................9.9.........9.9........7.7.9.9......7.7.9.9......7.9................................7.............9......7.9.........7.9........9......9....9.....9.........9.........................7...............9.9............9.........9........97.97...9.9.77...9.........7....................7.9...........7..9........................... T-D/ (s)...... 7................. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7.. 7.. T-D/ (s)..... MH... T-D/ (s).............................................................................................................................................................................7..................7...7.7..7..........7..7.........77......................................9..........................9.9.9......................7.7....9..9.9...9..9.9.7.7.........7...................................................9.9........9.9........7.7.9.9.9.9...7.9...7.9......7..........................77........9.9........97....97........9.........7.9..............7.9..7..9..............9...7.9.9......7...............7.7.................... 7. 7. 7. 7. 7. 7. 7. 7. 7.................9.9...7.7.7.......9....7..9.9......7.7.7.7......7.7.7.7.7.7....................9.9...7...9.....9.........7..................................9.9...........................................................................7..............9.9....7........9.................9.............................97.97...........7..7.......9.9.............................9............7.................7.....9....9........9......................................7....97.........97.....................................................9.9.........9.9........7.7.9.9......7.7.9.9....7.9.......................9.9............................ 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7....... T-D/ (s)..... Fig.... T-D/ (s)...7. 7.... 7.................9........9.......9.......9......7....9...7.........7............ Ray diagrams (top) and comparison between Fig. 9 Same as Fig. but for Line. observed and calculated travel times for each OBS along Line (bottom). The observed travel times are indicated by vertical bars and the calculated ones by lines. The reduction velocity is. km/s.

................................................................................................................................................................................................................................................................................................................................9..9...............................................................................................9..9..9..9..9..7..7.............................................7..7..7..7..7..7..7..7..7..7..7..7..7..7..7..7..7..7..7..7..7..7..7..7..7..7..7..7...7..7......9..9.................................................. T-D/ (s)....... T-D/ (s)................................................................................................................................................................................................................................................................................................................................9..9...............................................................................................9..9..9..9..9..7..7.............................................7..7..7..7..7..7..7..7..7..7..7..7..7..7..7..7..7..7..7..7..7..7..7..7..7..7..7..7...7..7......9..9.................................................. T-D/ (s)....... T-D/ (s) MH W E 7...............................................................................................................................................................9..9..9..9..7.9.7.9....................................................................................................................9..9.....................................9..9...............9..9......................................................................9..9.....9.9.9.9......9..9..9..9..9..9..9..9..9..9..9....................7..7..7..7..7..7......7..7.............9..9.....................................7..7..........7..7...........9..9..9..9..9..9..9..9..9..9..9......................................9.. 7.. 7.. 7.. 7.. 7.. 7.. 7.. 7.. 7.. 7. 7....... T-D/ (s) 7....... T-D/ (s) 7...............................................................................................................................................................9..9..9..9..7.9.7.9....................................................................................................................9..9.....................................9..9...............9..9......................................................................9..9.....9.9.9.9......9..9..9..9..9..9..9..9..9..9..9....................7..7..7..7..7..7......7..7.............9..9.....................................7..7..........7..7...........9..9..9..9..9..9..9..9..9..9..9......................................9.. 7.. 7.. 7.. 7.. 7.. 7.. 7.. 7.. 7.. 7. 7....... T-D/ (s) 7....... T-D/ (s) 7...............................................................................................................................................................9..9..9..9..7.9.7.9....................................................................................................................9..9.....................................9..9...............9..9......................................................................9..9.....9.9.9.9......9..9..9..9..9..9..9..9..9..9..9....................7..7..7..7..7..7......7..7.............9..9.....................................7..7..........7..7...........9..9..9..9..9..9..9..9..9..9..9......................................9.. 7.. 7.. 7.. 7.. 7.. 7.. 7.. 7.. 7.. 7. 7....... T-D/ (s) 7....... T-D/ (s) 7...............................................................................................................................................................9..9..9..9..7.9.7.9....................................................................................................................9..9.....................................9..9...............9..9......................................................................9..9.....9.9.9.9......9..9..9..9..9..9..9..9..9..9..9....................7..7..7..7..7..7......7..7.............9..9.....................................7..7..........7..7...........9..9..9..9..9..9..9..9..9..9..9......................................9.. 7.. 7.. 7.. 7.. 7.. 7.. 7.. 7.. 7.. 7. 7....... T-D/ (s) 7....... T-D/ (s) MH7 MH MH SE NW SE NW Azusa NISHIZAWA, Tomozo ONO, Noboru SASAHARA, Hiroshi HASHIGUCHI and Yasuo OTANI

Ocean Bottom Seismographic Observation at Minami-Hiyoshi Seamount at the Northern End of the Mariana Arc Line Line MH9 MH Line MH7 T-D/ (s)........... T-D/ (s) T-D/ (s)...................... T-D/ (s)........... T-D/ (s)........... T-D/ (s)........... T-D/ (s)........... T-D/ (s)........... MH SSW NNE WSW ENE NW MH MH SE T-D/ (s)...................... Line W MH E NW W SE E

Azusa NISHIZAWA, Tomozo ONO, Noboru SASAHARA, Hiroshi HASHIGUCHI and Yasuo OTANI SSW....... MH9..........??... Line? 7 9...................... NNE WSW MH Line ENE MH?? 7 9 D i s t a n c e (km) NW 7 9.......... MH7 MH.................. MH Line 7 W E MH Line.? D i s t a n c e (km) 7 P wavespeed (km/s)? SE

Ocean Bottom Seismographic Observation at Minami-Hiyoshi Seamount at the Northern End of the Mariana Arc Aug. horizontal component Sep.7 MH MH horizontal component MH MH MH MH7 MH7 MH MH9 MH MH9

Azusa NISHIZAWA, Tomozo ONO, Noboru SASAHARA, Hiroshi HASHIGUCHI and Yasuo OTANI Aug. MH horizontal component -HzBPF Sep.7 MH -HzBPF Sep. horizontal component -h

Ocean Bottom Seismographic Observation at Minami-Hiyoshi Seamount at the Northern End of the Mariana Arc N MH N 7 9 MH 7 9 MH N 7 9 ~ 7 9 MH7 N 7 9 MH 7 9 MH9 7 9 S-P time (sec) 7 9 S-P time (sec)

Azusa NISHIZAWA, Tomozo ONO, Noboru SASAHARA, Hiroshi HASHIGUCHI and Yasuo OTANI V MHV V H MHV MHV MHV MH9V MH7V sec ' ' Kita-Fukutoku Tai ' ' Fukutoku-okanoba ' Fukutoku-okanoba Minami-Hiyoshi Smt. Nikko Smt. Kita-Hiyoshi Smt. ' Minami-Hiyoshi Smt. ' ' Nikko Smt. ' ' ' '

.... : : : 7/ 99fuku7 : : : : : : : 7/ : : : 99fuku : 99fuku : 7/ : : : : : 7: 99fuku 9: 9: : 7/ :..... airgun : / 9: : 9: : 7: : : : : : : : : 7: : : : : : : : : : : : : : : : : : : : : : : : : 9: : : / : : : : 9: : : /7 : : : : : : 7: : : : : : : : : 7: : : 9: : 9: : 9: : : : 9: : : : 7: 7:.... Ocean Bottom Seismographic Observation at Minami-Hiyoshi Seamount at the Northern End of the Mariana Arc ' ' ' ' ' ' ' km Line ' Iwo-jima ' Kita-Fukutoku Tai Line Line Line Line Line GMT Dec ::9 /export/home/hiyoshi/topo/nmariana_wgs.grd -Jm: ' Fukutoku-okanoba Minami-Iwo-jima Line Line ' Mt. Fuji '... Nikko Smt. Minami-Hiyoshi Smt......... ' -. -. -. -. -. -.. depth(km) 999 Fukutoku-okanoba submarine volcano Line W E..... MH9...??.... 7 9 SSW Line NNE WSW MH ENE....................... MH.............. 7 9 FK Line D i s t a n c e (km) FK........ NW MH7 Line SE MH MH FK FK? 7 9 7 W E Line..... MH... D i s t a n c e (km) Line W E FK7 FK9............... D i s t a n c e (km)?? Line SSW NNE FK FK FK.. FK FK? D i s t a n c e (km) FK9???? Minami-Hiyoshi Seamount Line NNW SSE???? D i s t a n c e (km)? D i s t a n c e (km)........... 7. 7... P wavespeed (km/s)

Azusa NISHIZAWA, Tomozo ONO, Noboru SASAHARA, Hiroshi HASHIGUCHI and Yasuo OTANI Phys. Earth Planet. Int. 7

Ocean Bottom Seismographic Observation at Minami-Hiyoshi Seamount at the Northern End of the Mariana Arc 7 Geophys. Res. Lett9 9 9 Geophys. Res. Lett9 79 Can. J. Explor. Geophys

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