日本船舶海洋工学会平成24年春季講演会（講演番号: OS3-2,  2012年5月17日～18日, 神戸市産業振興センター）にて講演  / 論文番号: 2012S-OS3-

KYO, Masanori

NAMBA, Yasuhiro

許, 正憲

難波, 康広

Japanese

JAMSTEC Repository

ࠕࡕࡁࡹ࠺ࠖ࡟ࡼࡿᮾ໭ᆅ᪉ኴᖹὒἈᆅ㟈※᥀๐࡛ タ⨨ணᐃࡢᏍෆほ ⿦⨨࡟ࡘ࠸࡚    ṇ ဨ 㞴 Ἴ ᗣ ᗈ* ṇ ဨ チ   ṇ ᠇*  Borehole Observatory System Installed in Tohoku Earthquake Zone with  the Deep-sea Drilling Vessel Chikyu by Yasuhiro Namba, Member Masanori Kyo, Member  Key Words: Borehole Observatory System, Tohoku Earthquake, Chikyu, IODP, Fault  1. ⥴  ゝ ᖹᡂ 23ᖺ 3᭶ 11᪥, ᮾ໭ᆅ᪉ኴᖹὒἈᆅ㟈ࡀⓎ⏕ࡋ, ᮾ໭ᆅ᪉୍ᖏ࡟኱ࡁ࡞⿕ᐖࢆࡶࡓࡽࡋࡓ. ࡇࡢ኱ᆅ㟈㟈※ᇦ࡟ฟ᮶ࡿࡔࡅ᪩ࡃ⛉Ꮫࡢ࣓ࢫࢆධࢀ, ᆅ㟈Ⓨ⏕ࡢ࣓࢝ࢽࢬ࣒ࢆᢕᥱࡍࡿࡇ࡜ࡣ, ⛉Ꮫ࡟࠾ࡅࡿᛴົ࡛࠶ࡿ.  ࡇࡢࡓࡵᾏὒ◊✲㛤Ⓨᶵᵓ࡛ࡣ, ᆅ㟈Ⓨ⏕┤ᚋ࠿ࡽ㟈※ᇦ࡛ࡢᾏᗏᆅᙧࡸᆅୗᵓ㐀ࡢㄪᰝࢆ㐍ࡵ࡚ࡁࡓ(ᑠᖹࡽ 1)). ౛࠼ࡤᐩኈཎࡽ 2)ࡣ, 㟈※࣭ὠἼἼ※ᇦ࡛ᆅ㟈๓ᚋࡢᾏᗏᆅᙧࢆẚ㍑ࡋ࡚, ᪥ᮏᾏ⁁㍈㝣ഃᩳ㠃᭱እഃ㒊ࡀᮾ༡ᮾ᪉ྥ࡟⣙ 50m, ᖹᆒ 7㹼10mୖ᪉࡟⛣ືࡋࡓࡇ࡜ࢆሗ࿌ࡋ࡚࠸ࡿ. ࡲࡓ, ୰ᮧࡽ 3)ࡣὠἼἼ※ᇦࡢᆅୗᵓ㐀ࢆᢕᥱࡍࡿࡓࡵ, ᆅ㟈Ⓨ⏕ᚋ」ᩘᅇ࡟ࢃࡓࡗ࡚཯ᑕἲᆅ㟈᥈ᰝࢆ⾜࠸, ᆅ㟈๓ᚋ࡛ࡢᆅୗᵓ㐀ኚ໬࡟㛵ࡍࡿㄪᰝࢆᐇ᪋ࡋ࡚࠸ࡿ. ࡇࡢࡼ࠺࡞, ୍㐃ࡢ㟈⅏ᑐᛂㄪᰝࡢ୍⎔࡜ࡋ࡚, ᆅ⌫῝㒊᥈ᰝ⯪ࠕࡕࡁࡹ࠺ࠖ࡟ࡼࡾᙜヱ㟈※ᇦ௜㏆ࢆ᥀๐ࡋ, ࡑࡢᏍ஭࠿ࡽࢥ࢔ࢆᅇ཰ࡋ, ࠶ࡿ࠸ࡣᏍ஭ෆ࡛ ᗘཬࡧᅽຊࢆィ ࡍࡿࡇ࡜࡟ࡼࡗ࡚, ᆅ㟈᫬࡟άືࡋࡓ᩿ᒙ࡟࠾ࡅࡿືᦶ᧿ಀᩘࡢ᥎ᐃࡸ, ᆅ㟈࡟ࡼࡗ࡚࡝ࡢ⛬ᗘࡢࡦࡎࡳࡀゎᨺࡉࢀࡓࡢ࠿➼, ᆅ㟈Ⓨ⏕࣓࢝ࢽࢬ࣒ࡢゎ᫂ࢆ┠ᣦࡋࡓࣉࣟࢪ࢙ࢡࢺࡀ㐍⾜୰࡛࠶ࡿ 4). ᥀๐ணᐃᆅⅬࢆ Fig.1࡟♧ࡍ. ᥀๐ணᐃᆅⅬ࡟ࡣ 2ࡘࡢᏍ஭ࢆ᥀๐ࡋ, ➨ 1Ꮝ࡛ࡣ≀⌮᳨ᒙ (Logging While Drilling : LWD) ࢆᐇ᪋ࡋ, ➨ 2Ꮝ࡛ࡣࢥ࢔ࡢᅇ཰ࢆ⾜࠺. ➨ 1Ꮝ, ➨ 2Ꮝ࡜ࡶ, Ỉ῝ࡣ⣙ 7,000㹫, ᥀๐Ꮝࡢᾏᗏୗ῝ᗘࡣ⣙ 1,000m࡛࠶ࡿ. ᥀๐ᚋࡢࡇࢀࡽࡢᏍෆ࡟ࡣ, ほ ⿦⨨ࢆタ⨨ࡋ, ௒ᅇࡢ኱㟈⅏࡛άືࡋࡓ᩿ᒙ࡟ṧࡉࢀࡓ⑞㊧ࢆほ ࡍࡿணᐃ࡛࠶ࡿ.  ᮏ✏࡛ࡣ, ᮏᖺ4᭶1᪥ࡼࡾ㛤ጞࡉࢀࡓᮾ໭ᆅ㟈※᥀๐ィ⏬ (Japan Trench Fast Earthquake Drilling Project : JFAST) ࡛タ⨨ࡉࢀࡿほ ⿦⨨ࡢᴫせ࡟ࡘ࠸࡚⤂௓ࡍࡿ.   2. ➨ 1Ꮝ࡟࠾ࡅࡿほ ࢩࢫࢸ࣒ ➨ 1Ꮝ࡟࠾ࡅࡿほ ࢩࢫࢸ࣒ࡢᴫせᅗࢆ Fig.2࡟♧ࡍ㸬 ➨ 1Ꮝ࡛ࡣ㸪MTL (Miniature Temperature Logger) ࡜⛠ࡍࡿ⮬ᕫグ㘓ᆺࡢᑠᆺ ᗘィࢆタ⨨ࡍࡿ. ୍㒊ࡢMTLࡣᅽຊィࡶഛ࠼࡚࠸ࡿ.  Fig.1 Site Location.  2. 1 Ꮝ஭ࡢᵓ㐀 ほ ࢩࢫࢸ࣒ࢆタ⨨ࡍࡿᏍ஭ࡢᵓ㐀࡜ࡋ࡚ࡣ, Ỉ῝6,910࣓࣮ࢺࣝࡢᾏᗏ㠃ୗ࡟ෆᚄ 8-1/2࢖ࣥࢳ, ῝ࡉ⣙1,000࣓࣮ࢺࣝࡢᏍࢆ᥀๐ࡋ, ࡇࡢ୰࡟ 4-1/2࢖ࣥࢳࡢࢣ࣮ࢩࣥࢢࢆタ⨨ࡍࡿ. ࢣ࣮ࢩࣥࢢ᭱ୗ㒊࡟ࡣࢳ࢙ࢵࢡࣂࣝࣈࡀタࡅࡽࢀ, ࢣ࣮ࢩࣥࢢタ⨨సᴗ୰ࡢὶయᄇᑕࢆྍ⬟࡜ࡋࡘࡘ, ほ ᫬࡟ࡣ ᗘィ ࡢᙳ㡪ࢆ୚࠼ࡿྍ⬟ᛶࡢ࠶ࡿ,ࢣ࣮ࢩࣥࢢእ㒊࠿ࡽෆ㒊࡬ࡢὶయࡢὶධࢆ㜵ࡄᵓ㐀࡜ࡍࡿணᐃ࡛࠶ࡿ.  2. 2 ࢭࣥࢧ࣮ࡢ㓄⨨ ୖ㏙ࡢࢣ࣮ࢩࣥࢢෆ࡟┤ᚄ 10࣑࣓࣮ࣜࢺࣝࡢ࣮ࣟࣉ 7ᮏࢆ⦪࡟ࡘ࡞࠸࡛ྞࡾୗࡆࡿ. ྠ࣮ࣟࣉ࡟ࡣྜィ࡛ 55࠿ᡤ࡟࢔࢖ࡀタࡅࡽࢀ, ࡇࢀࡽࡢ࢔࢖࡟ྲྀࡾ௜ࡅࡿᙧ࡛, Table 1࡟♧ࡍMTL (a)࠶ࡿ࠸ࡣ(b)ࡢࢭࣥࢧ࣮ࢆタ⨨ࡍࡿ. ࡇࡇ࡛, MTL(a)ࡣ RBR♫〇ࡢᑠᆺ ᗘィ࡛࠶ࡾ, 25ಶࢆタ⨨ࡍࡿ. ࡇࡢ࠺ࡕ 10ಶࡣ,  ᗘィ ࡜ྠ᫬࡟ᅽຊィ ࡶྍ⬟࡛࠶ࡿ. ୍᪉MTL(b)ࡣ Antares♫〇ࡢᑠᆺ ᗘィࢆ⾲ࡋ, 30ಶࡀタ⨨ࡉࢀࡿ.  55࠿ᡤࡢ࢔࢖ࡣ, ࢔࢖ྠኈࡢ㊥㞳ࡀ᭱▷࡛ 2࣓࣮ࢺࣝ⛬ᗘ, ᭱㛗࡛ 100࣓࣮ࢺࣝ⛬ᗘ࡜࡞ࡿࡼ࠺࡟, ࠶ࡿ㒊ศ࡛᭱ࡶᐦ࡟, ࡑࡢ࿘ᅖ࡛ḟ➨࡟␯࡜࡞ࡿࡼ࠺࡞ᐦᗘศᕸ࡛ྲྀࡾ௜ࡅࡽࢀ࡚࠾ࡾ, ≀⌮᳨ᒙ᫬࡟ᚓࡽࢀࡓࢹ࣮ࢱࢆࡶ࡜࡟, ほ ᑐ㇟࡜࡞ࡿ᩿ᒙ఩⨨ࢆ≉ᐃࡋ, ࡇࡢ᩿ᒙ఩⨨࡛ࢭࣥࢧ࣮ࡢᐦᗘࡀࡶࡗ࡜ࡶ㧗ࡃ࡞ࡿࡼ࠺࡟ࡍࡿ.   * ᾏὒ◊✲㛤Ⓨᶵᵓ ᆅ⌫῝㒊᥈ᰝࢭࣥࢱ࣮  日本船舶海洋工学会講演会論文集 第 14 号 原稿受付 平成 24年 4月 6日春季講演会において講演 平成 24年 5月 17, 18日©日本船舶海洋工学会論文番号 2012S-OS3-2─57─  2. 3 ࢭࣥࢧ࣮ࡢᅇ཰ ࣮ࣟࣉୖ➃࡟ࡣMTLࣁ࣮ࣥ࢞࡜࿧ࡤࢀࡿ㒊ᮦࢆྲྀࡾ௜ࡅ, ࡇࢀࢆᾏᗏ㠃ୖᵓ㐀≀࡟ᘬࡗ᥃ࡅࡿᙧ࡛ᅛᐃࡍࡿ. ࣁ࣮ࣥ࢞ୖ㒊࡟ࡣ ROVࡢࣇࢵࢡ⏝࡟✰ࡀタࡅࡽࢀ, ᑗ᮶ⓗ࡟ࡣ ROVࡢࣇࢵࢡࢆࡇࡢ✰࡟ᘬࡗ᥃ࡅ࡚, ࣮ࣟࣉࡈ࡜ࢭࣥࢧ࣮ࢆᅇ཰ࡍࡿணᐃ࡛࠶ࡿ.  4Ͳ1/2”CSG8Ͳ1/2”Hole#5#3#2#1#4#6Rope#7Fault Eye Spliced-inRope RingProtectorTapeMTL (a), (b) Fig. 2 A schematic diagram of the observatory system in the #1 well.  Table 1 Principal dimension of MTL sensors. MTL (a) (b)Manufacturer RBR AntaresPN TDRͲ2050Ti 185*(DeepWater)TemperatureDataLoggerQuantity 25(10ofthesehavepressuresensorsaswell.)30W inair(gf) 550 200Winwater(gf) 220OD(mm) 38 20L(mm) 270 190  ࡞࠾, ୖ㏙ࡢ 7ᮏࡢ࣮ࣟࣉ㛫ࡣ㔠ᒓ〇ࣜࣥࢢ࠶ࡿ࠸ࡣ, ࣮ࣟࣉྠኈࢆ⤖ࡪࡇ࡜࡟ࡼࡗ࡚᥋⥆ࡍࡿணᐃ࡛࠶ࡿࡀ, ୍㒊(2࠿ᡤ࠶ࡿ࠸ࡣ 3࠿ᡤ⛬ᗘ)࢘࢕࣮ࢡࣜࣥࢡࢆ౑⏝ࡍࡿ. ࡇࢀࡣ, ⌧ሙࡢ᩿ᒙࡀ㟈⅏ᚋࡶάືࢆ⥆ࡅ࡚࠾ࡾ, ࢩࢫࢸ࣒タ⨨ᚋᅇ཰ࡲ࡛ࡢ㛫࡟ࢩࢫࢸ࣒ࡀᏍ஭ෆ࡟ᢚ␃ࡉࢀࡓሙྜࢆ⪃࠼, ほ ࢩࢫࢸ࣒ࡢ୍㒊ࡔࡅ࡛ࡶᅇ཰࡛ࡁࡿࡼ࠺࡟ࡍࡿࡓࡵ࡛࠶ࡿ.  3. ➨ 2Ꮝ࡟࠾ࡅࡿほ ࢩࢫࢸ࣒ ➨ 2Ꮝ࡟࠾ࡅࡿほ ࢩࢫࢸ࣒ࡢᴫせᅗࢆ Fig.3࡟♧ࡍ㸬 ➨ 2Ꮝ࡛ࡣ㸪ࢧ࣮࣑ࢫࢱࢆෆⶶࡋࡓ㟁Ẽࢣ࣮ࣈࣝ(ࢧ࣮࣑ࢫࢱࢫࢺࣜࣥࢢ), ࣈࣜࢵࢪᅇ㊰࡜ AD ኚ᥮ჾ࠿ࡽ࡞ࡿィ 㒊, ࣮࣭ࣟ࢞ࣂࢵࢸࣜࣘࢽࢵࢺ, 㡢㡪㏻ಙ㒊࠿ࡽᵓᡂࡉࢀࡿ ᗘィ ࢩࢫࢸ࣒ཬࡧᅽຊ࣏࣮ࢺ, ᅽຊఏ㐩⟶, ᅽຊࢭࣥࢧ࣮࠿ࡽ࡞ࡿᅽຊィ ࢩࢫࢸ࣒ࢆタ⨨ࡍࡿ.      SinkerbarCheckvalve4Ͳ1/2CSG10Ͳ5/8HoleFault     Fig. 3 A schematic diagram of the observatory system in the #2 well.  3. 1 Ꮝ஭ࡢᵓ㐀 ➨ 2Ꮝࡣ, ᾏᗏ㠃ୗ࡟ෆᚄ 10-5/8࢖ࣥࢳ, ῝ࡉ⣙ 1,000࣓࣮ࢺࣝࡢᏍࢆ᥀๐ࡋ, ࡇࡢ୰࡟ 3-1/2࢖ࣥࢳࡢࢣ࣮ࢩࣥࢢࢆタ⨨ࡍࡿ. ࢣ࣮ࢩࣥࢢ᭱ୗ㒊࡟ࡣ➨ 1㡯࡜ྠᵝࡢ┠ⓗ࡛ࢳ࢙ࢵࢡࣂࣝࣈࡀタࡅࡽࢀࡿ.  3. 2 ࢭࣥࢧ࣮ࡢ㓄⨨ ୖ㏙ࡢࢣ࣮ࢩࣥࢢෆ࡟ࢧ࣮࣑ࢫࢱࢫࢺࣜࣥࢢࢆྞࡾୗࡆࡿ. ྠࢫࢺࣜࣥࢢ࡟ࡣྜィ࡛ 21ಶࡢࢧ࣮࣑ࢫࢱ࡜ 2ಶࡢᇶ‽᢬ᢠࢆෆⶶࡍࡿ. ➨ 1Ꮝࡢほ ࢩࢫࢸ࣒࡜ྠᵝ࡟21࠿ᡤࡢࢧ࣮࣑ࢫࢱࡣ, ࠶ࡿ㒊ศ࡛᭱ࡶᐦ࡟, ࡑࡢ࿘ᅖ࡛ḟ➨࡟␯࡜࡞ࡿࡼ࠺࡞ᐦᗘศᕸ࡛ྲྀࡾ௜ࡅࡽࢀ࡚࠾ࡾ, ほ ᑐ㇟࡜࡞ࡿ᩿ᒙ఩⨨㏆㎶࡛ࢭࣥࢧ࣮ࡢᐦᗘࡀࡶࡗ࡜ࡶ㧗ࡃ࡞ࡿࡼ࠺࡟ྲྀࡾ௜ࡅࡽࢀࡿ. Table 2࡟ࢧ࣮࣑ࢫࢱࢫࢺࣜࣥࢢ(ࢧ࣮࣑ࢫࢱࢣ࣮ࣈࣝ࡜ࢧ࣮࣑ࢫࢱࢆྜࢃࡏʔ20Ɍ40( T320(TBC)ThermistorMoldPartMTL Hanger3Batteries and etc…Thermistor ─58─  ࡓ࿧⛠)ࡢ௙ᵝࢆ♧ࡍ.  ྠ᫬࡟ࢣ࣮ࢩࣥࢢእ࡟ࡣ 2ᮏࡢᅽຊఏ㐩⏝Ỉ⟶ࡀྲྀࡾ௜ࡅࡽࢀ, ᩿ᒙ㏆㎶ཬࡧࡑࡢ 100࣓࣮ࢺࣝୖ㒊࡟ᅽຊ࣏࣮ࢺࢆタࡅࡿ. ᅽຊఏ㐩⟶࡛ఏ㐩ࡉࢀࡓᅽຊࡣ, ᾏᗏ㠃ୖᵓ㐀≀࡟ྲྀࡾ௜ࡅࡽࢀࡓᅽຊࢭࣥࢧ࣮࡛ࢹࢪࢱࣝࢹ࣮ࢱ࡟ኚ᥮ࡉࢀ, ࣮ࣟ࢞࡟࡚ಖᏑࡉࢀࡿ.   Table 2 Specifications for the thermistor string. Items(Unit) SpecificationAsthewholesystem TemperatureRange(deg C) 0to60Resolution(deg C) 0.001Accuracy(deg C) 0.01SamplingInterval(min) 10 to60Period forMeasurement(year) 4(w/oswappingofbatteries)StringitselfOD @cable(mm) 20OD@thermistor(mm) About35L@thermistor (mm) 350Weightinair(kg/km) 340Weightinwater(kg/km) 16.19Tensilestrength(kgf) 600Materialofstrengthsupport KevlarNumberofconductors 27Resistanceofconductor(ɏ/km) <100Conductor section(mm2) 0.2TotalLength(m) 1100Minimumbendingradius(mm) 400(200w/noͲload)   3. 3 ࢹ࣮ࢱࡢᅇ཰ ➨ 2Ꮝࡢ ᗘほ ࢩࢫࢸ࣒࡟࠾ࡅࡿࢹ࣮ࢱࡢᅇ཰ࡣ,ḟࡢ 3ࡘࡢ᪉ἲ࡛ྍ⬟࡛࠶ࡿ.  (1) ROV࡟ࡼࡿ࣮ࣟ࢞⮬యࡢᅇ཰ (2) ROV⤒⏤ࡢ᭷⥺㏻ಙ࡟ࡼࡿᅇ཰ (3) 㡢㡪㏻ಙ࡟ࡼࡿᅇ཰ ୍᪉➨ 2Ꮝࡢᅽຊほ ࢩࢫࢸ࣒࡟࠾ࡅࡿࢹ࣮ࢱࡢᅇ཰ࡣ,ୖグࡢ࠺ࡕ(1)࡜(3)ࡢᡭἲࢆ‽ഛࡋ࡚࠸ࡿ.  ࡇࡢࡼ࠺࡟➨ 2Ꮝ࡛ࡣ」ᩘࡢࢹ࣮ࢱᅇ཰ᡭἲࢆ⏝ពࡍࡿࡇ࡜࡛, ᅇ཰ࡢᡂຌ⋡ୖ᪼ࢆ≺࠺࡜࡜ࡶ࡟, ᡂᯝࢆ࠶ࡆࡿ࡜࡜ࡶ࡟, ➨ 1Ꮝࡢほ ⿦⨨࡜ేࡏ࡚, ඲య࡛෕㛗ᛶࢆᣢࡗࡓほ ࢩࢫࢸ࣒࡜ࡋ࡚࠸ࡿ.   4. ⤖ㄽ ᮏ✏࡛ࡣ, ᮏᖺ4᭶1᪥ࡼࡾ㛤ጞࡉࢀࡓᮾ໭ᆅ㟈※᥀๐ィ⏬ (JFAST) ࡛タ⨨ࡉࢀࡿほ ⿦⨨ࡢᴫせ࡟ࡘ࠸࡚⤂௓ࡋࡓ.  ➨ 1 Ꮝ࣭ ➨ 2Ꮝ࠸ࡎࢀࡢほ ࢩࢫࢸ࣒࡟࠾࠸࡚ࡶ,  ᗘཬࡧᅽຊࡢィ ࡀ⾜ࢃࢀ, ᆅ㟈࡛άືࡋࡓ᩿ᒙ㏆㎶࡟࠾ࡅࡿ ᗘࡢ✵㛫ⓗ, ᫬㛫ⓗศᕸࡢࢹ࣮ࢱࢆྲྀᚓࡍࡿࡇ࡜࡟ࡼࡗ࡚, ౛࠼ࡤᆅ㟈᫬࡟Ⓨ⏕ࡋࡓᦶ᧿⇕, ゎᨺࡉࢀࡓṍ㔞ࡢ᥎ィࢆࡵࡊࡋ࡚࠸ࡿ. ᮏࣉࣟࢪ࢙ࢡࢺࡢ⤖ᯝᚓࡽࢀࡿ᪂ࡋ࠸ࢹ࣮ࢱࡣ, ࡇࢀࡲ࡛㟈⅏๓ᚋ࡟ᐇ᪋ࡉࢀࡓᾏᗏᆅᙧㄪᰝࡸᆅ㟈Ἴ᥈ᰝࡢ⤖ᯝ࡜⤫ྜࡍࡿࡇ࡜࡟ࡼࡗ࡚, ᮾ໭ᆅ᪉ኴᖹὒἈᆅ㟈ࡢᆅ㟈Ⓨ⏕࣓࢝ࢽࢬ࣒ࡢゎ᫂࡟኱࠸࡟ᙺ❧ࡘࡶࡢ࡜ᮇᚅࡉࢀࡿ.   ㅰ      ㎡ ᮏࣉࣟࢪ࢙ࢡࢺࡣ㸪⤫ྜᅜ㝿῝ᾏ᥀๐ィ⏬㸦IODP㸧➨343ḟ◊✲⯟ᾏ࡜ࡋ࡚⾜ࢃࢀࡿࡶࡢ࡛࠶ࡿ㸬IODPࡢ୰ኸ⟶⌮⤌⧊࡛࠶ࡿ IODP-MIཬࡧ㸪ᩥ㒊⛉Ꮫ┬㸪⡿ᅜᅜ❧⛉Ꮫ㈈ᅋ(NSF) 㸪ࡑࡢ௚ຍ┕ྛᅜࡢ㛵ಀᶵ㛵ཬࡧ㛵ಀ⪅ࡢࡈດຊ࡟ឤㅰࡢពࢆ⾲ࡍࡿ㸬  ཧ ⪃ ᩥ ⊩ 1) ᑠᖹ⚽୍௚㸸2011 ᖺᮾ໭Ἀᆅ㟈㟈※ᇦ࡛ࡢ⥭ᛴㄪᰝࡢ⤖ᯝ࡜௒ᚋࡢᒎᮃ, ࣈ࣮ࣝ࢔࣮ࢫ 2012 せ᪨㞟, 2012, p.15. 2) ᐩኈཎᩄஓ௚㸸2011 ᖺᮾ໭ᆅ᪉ኴᖹὒἈᆅ㟈๓ᚋࡢᾏᗏᆅᙧㄪᰝ࠿ࡽ᫂ࡽ࠿࡟࡞ࡗࡓᾏᗏኚື, ࣈ࣮ࣝ࢔࣮ࢫ 2012せ᪨㞟, 2012, pp.16-17. 3) ୰ᮧᜤஅ௚㸸ᮾ໭ᆅ᪉ኴᖹὒἈᆅ㟈㟈※ᇦ(ᐑᇛἈ)࡟࠾ࡅࡿ⥭ᛴ཯ᑕἲᆅ㟈᥈ᰝ, ࣈ࣮ࣝ࢔࣮ࢫ 2012せ᪨㞟, 2012, p.18. 4) Jim Mori et.al. : Japan Trench Fast Earthquake Drilling Project (JFAST). IODP Sci. Prosp., 343. doi: 10.2204/iodp.sp.343.2012., 2012, pp.3-14. ─59─

Borehole Observatory System Installed in Tohoku Earthquake Zone with the Deep-sea Drilling Vessel Chikyu

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