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Saito et al., 2007). The information concerning the gas hydrates in the Nankai Trough was initially published in 2000 by the Japan
National Oil Corporations. The data in the news release came from a series of boreholes what were started in the late 1990s. In this area, the main sedimentological controls for the accumulation of gas hydrates are the sand-rich areas of the trough (Collett, 2002). Well coring indicates the presence of at least three gas hydrate zones. Krason, 1994, estimated that there are 0.42 to 4.2Ă10 cubic meters of methane within the gas hydrates. Seismically, the high bottom simulating reflectors are considered indicative of gas hydrates (Colwell et al., 2004). Methane-rich horizons have been identified as areas of higher attenuation of sonic frequencies (10 to 20 kHz) and only slight attenuation of seismic frequencies (30 to 110 Hz) (Matsushima, 2006).
331:. The source of water for the formation of gas hydrates frequently comes from the dewatering of a subducting slab as well as the overriding plate (Muramatsu et al., 2006). Gas hydrates nearest the trough appear to be sourced mainly from dewatering associated with subduction, while with increasing distance from the trough the sourcing is more a result of lateral movement of methane enriched waters (Muramatsu et al., 2006). This was determined by drilling a series of boreholes and measuring the concentration, as well as radiometric age determination of the halogen elements iodine, bromine, and chlorine (Tomaru et al., 2007). The age determination of the iodine indicated multiple methane sources.
213:. This area was not in the original NUVEL models (DeMets et al., 1990). However, a more recent study that included the Philippine Sea plate was based on data from the NUVEL-1A model (Zang et al., 2002). This study estimates that subduction in the Nankai Trough is about 43 mm/yr. REVEL-based calculations indicate that there is no accumulation of strain at the trench. The rates of movement have been calculated to be in a range of 3.0 ± 1.8 mm/yr to 11.1 ± 1.7 mm/yr (Sella et al., 2002). As mentioned previously, the NUVEL-1A plate motion model does not include the Philippine Sea plate. This is because the mathematics of this model only used twelve plates, and the Philippine Sea and
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basin (Shikoku Basin) with active hydrothermal activity during its formation. As basin formation stopped and sedimentation took place, the sediments acted like a blanket to trap the heat below. Rapid sedimentation resulted in a greater retention of heat. There was also underground fluid flow with the fluids being much hotter than the present-day temperature of the sediments, which affected mineralization and, potentially, the physical and biological properties of the region.
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steeper than elsewhere in the
Pacific Ocean. Reaching temperatures of approximately 130 °C in other areas would require collecting cores from approximately 4 kilometers below the seafloor, rather than 1.2 kilometers as planned by Expedition 370. Eventually, IODP Expedition 370 reached a temperature of ~120 °C at 1.2 kilometers below the seafloor with mineral evidence showing that there are localized depths with significantly higher temperatures due to hot fluids.
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activity in the Nankai Trough were identified using full waveform tomography. The upper portion of the upper accretionary prism and the underlying backstop are currently undergoing a great deal of compressional pressure. Several thrust faults were identified by Operto et al., 2006, of which the thrust faults closest to the subduction zone are active. Furthermore, Pisani et al., 2006, identified protothrusts and
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234:(Spinelli et al., 2007). There are indications of an increase in the retention of porosity within the rock. Typically porosity decreases with increasing depth. However, there is an anomalous preservation of porosity at depth at drill site 1173. This has been attributed to post-depositional opal cementation that is preserving the porosity (Spinelli et al., 2007). The detrital clays, primarily
284:(Hitoshi et al., 2006). Other interesting results of the pressure measurements were the pressure changes that resulted from sediment deformation near boreholes and the effect of very low earthquake swarms at the time of pressure changes (Davis et al., 2006). The working hypothesis is that pressure changes indicate a change in the elastic strain within the formation (Davis et al., 2006).
238:, display variation over time and location in the Nankai Trough as well as the Shikoku basin. At depth there is an increase in the smectite clay content in the sediments, inferring that there has been a change in the deposition source rock (Steurer et al., 2003). Furthermore, there is a geothermal alteration of the smectite, converting it to illite clay (Steurer et al., 2003).
303:. Using recent ocean bottom seismograph studies, it has been determined that most of the seismicity occurs near the trough axis (Obana et al., 2006). Along the western area of the Nankai Trough, seismicity appears to be related to irregularities in crustal structure such as fractures generated from the subducted seafloor, including backarc basin crust of the
36:
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sites 808 and 1173) in an attempt to quantify changes in pore-fluid pressure that are a result of the oncoming
Philippine Sea plate (Davis et al., 2006). Site 808 is located in the front section of the main thrust fault, while site 1173 is located approximately 11 km from the frontal thrust zone
343:
The Nankai accretionary complex is an area with high heat flow. Its thermal history is complex due to multiple heating events or property changes. IODP Expeditions drilled the accretionary complex of the Nankai Trough and reveal the thermal history with drill core analyses. The area was originally a
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Drill cores from the seaward edge of the Nankai Trough (where the heat flow is one of the highest in the region) reveal that sediments there only reach pre-oil window to early oil window thermal maturities. However, the trough is potentially a major source of hydrocarbon fuel, in the form of methane
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Expedition 370 will seek to find the temperature limit of the deepest life on Earth by drilling in the Nankai Trough, where heat flow is particularly high near its boundary with the subducting young, hot
Philippine Sea tectonic plate. At the targeted site, the geothermal gradient is about four times
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behavior: frequency of earthquakes varying on a 90 to 150-year cycle (Mitsui, et al., 2004; Tanioka et al., 2004), similar slip occurrences along the fault segments, the order of subdivision faulting, and finally, different failure features. Hydrologic observatories were placed in boreholes drilled
334:
It has been estimated that convergent margins may contain up to two-thirds of the total gas hydrate volume on the Earth (Kastner, 2001). The Nankai Trough has been described as containing a large amount of gas hydrates and is one of the best studied sites of gas hydrate formations (Collett, 2002;
307:, as well as due to serpentization of uppermost mantle beneath the overriding plate (Obana et al., 2006). Recent large scale earthquakes resulting from subduction along the Nankai Trough have occurred in areas of large scale increases in the dip angle of the subducting plate (Hori et al., 2004).
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surfaces along the Nankai Trough. Recently there has been an increase in interest in the release of water from illite clays in subducting sediments. The conversion of smectite to illite (illitization) in subduction zones is likely driven by the higher temperature found in the subduction zone as
246:
The Nankai Trough is actively deforming and marks a region of seismic activity. Deformation is concentrated in the outermost imbricate zone, with a significant amount of "out of sequence" thrusting occurring landward. Based on the work of Operto et al., 2006, several areas of intense tectonic
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Hori, T., Kato, N., Hirahara, K., Baba, T., Keneda, Y., 2004, A numerical simulation of earthquake cycles along the Nakai Trough in southwest Japan: lateral variation in frictional property due to the slab geometry controls the nucleation position, Earth and
Planetary Science Letter, v. 22,
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Ike, T., More, G., Okano, T., Kuramoto, S., Taira, A., Along strike changes in basement topography and sediment thickness in the northern
Shikoku Basin: Variable inputs to the Nankai Trough Seismogenic Zone, EOS Transaction, American Geophyiscal Union, vol. 85, Fall Meeting
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convergent margin were not included. However, using the
Eurasia to North America plate motion, the estimated rate was 2â4 mm/yr (DeMets et al., 1990). This is not in agreement with the REVEL model, seemingly indicating that the NUVEL-1A model may need further revision.
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The Nankai Trough is the near-surface extension of a zone of active seismicity that dips beneath SW Japan. The rupture zone has been subdivided into five areas with respect to seismic modelling (Mitsui et al., 2004). These five subdivisions show interesting differences in
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Davis, E., Becker, K., Wang, K., Obara, K., Ito, Y., Kinoshita, M., 2006, A discrete episode of seismic and aseismic deformation of the Nankai trough subduction zone accretionary prism and incoming
Philippine Sea plate, Earth and Planetary Science Letter 242,
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Kastner, 2001, Gas ydrates in convergent margins: formation, occurrence, geochemistry, and global significance. Natural Gas
Hydrates: Occurrence, Distribution and Detection. Geophysical Monograph, vol. 124. American Geophysical Union Washington, DC,
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Operto, S., Virieux, J., Dessa, J., Pascal, G., 2006, Crustal seismic imaging from multifold on bottom seismometer data by frequency domain full waveform tomography: Application to the eastern Nankai trough, Journal of
Geophysical Research, v. 111,
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Volti, T., Kaneda, Y., Zatsepin, S., Crampin, S., 2005, An anomalous spatial pattern of shear-wave spitting observed of Ocean Bottom Seismic data above a subducting seamount in the Nankai Trough, Geophysical Journal International, v. 163,
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Katsushisa, K., Masayuki, T., 2004, Short-period seismic radiation zones of a megathrust fault along the Nankai, Trough deduced from inversion analysis of seismic intensity data, Journal of Seismilogical Society of Japan, v. 57, no. 2, pp
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Muramatsu, Y., Doi, T., Tomaru, H., Fehn, U., Takeuchi, R., Matsumote, R., 2006, Hologen concentrations in pore waters and sediments of the Nankai, Trough, Japan: Implications for the origin of gas hydrates, Applied Geochemistry, v. 22,
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Tomaru, H., Lu, Z., Fehn, U., Muramatsu, Y., Matsumoto, R., 2007, Age variations of pore water iodine in the eastern Nankai Trough, Japan: Evidence for different methane sources in a large gas hydrate field, Geology, v. 35, no. 11,
266:
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Demets, C., Gordon, R., ARgus, D., Stein, S., 1994, Effects of recent revisions to the geomagnetic reversal time scale on estimates of current plate motions, Geophysical Research Letters, v. 21, n. 20 pp. 2191â2194.
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Zhao, S., Wu, X., Hori, T., Smith, A., Kaneda, A., Takemoto, S., 2003, Deformation and stress localization at the Nankai subduction zone, southwest Japan, Earth and Planetary Science Letters, v. 206, pp. 145â160.
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Spinelli, G., Mozley, P., Tobin, H., Hoffman, N., Bellew, G., 2007, Diagenesisi, sediment strength, and pore collapse in sediment approaching the Nankai Trough subduction zone, GSA Bulletin, v. 119, pp. 377â390.
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Saito, H., Suzuki, N., 2007, Terrestria organic matter controlling gas hydrate formation in the Nankai Trough accretionary prism, offshore Shikoku, Japan, Journal of Geochemical Exploration, v. 95, pp. 88â100.
181:. Furthermore, seismic reflection studies have revealed the presence of basement highs that are interpreted as seamounts that are covered in sediments (Ike, 2004). The northern part of the trough is known as the
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Saffer, D., Underwood, M., McKiernan, A., 2005, Smectitie transformation in the Nankai trough: Effects on subduction zone mechanics and hydrogeology, Paper, No. 245-10, 2005 Salt Lake City Annual Meeting.
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Hitoshi, M., Masonori, I., Tadanor, G., Takafu, K., 2006, Current research status and meaning of fluid pressure monitoring at the Nankai Trough, Journal of Geography, v. 115, n. 3, pp. 367â382.
467:
Tsang, Man-Yin; Bowden, Stephen A.; Wang, Zhibin; Mohammed, Abdalla; Tonai, Satoshi; Muirhead, David; Yang, Kiho; Yamamoto, Yuzuru; Kamiya, Nana; Okutsu, Natsumi; Hirose, Takehiro (2020-02-01).
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Tanioka, Y., Kusunose, T., Babu, T., Haseqawa, Y., 2004, Large earthquake along the Nankai trough, the 1944 Tanankai earthquake (Mw 8.0) and two 2004 Tonankai-oki earthquakes (Mw 7.2 and 7.4),
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A seaward change in the pressure as measured by the borehole instruments likely indicates a relaxation of the sediments from the previous major thrust earthquake. Furthermore, the short period
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Matsushima, J., 2006, Seismic wave attenuation in methane hydrate-bearing sediments: Vertical seismic profiling data from the Nankai Trough exploratory well, offshore Tokai, central Japan,
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except for a high flux of sediments that fills the trench. Within the Nankai Trough there is a large amount of deformed trench sediments (Ike, 2004), making one of Earth's best examples of
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Obana, K., Kodaira, S., Keneda, Y., 2005, Seismicity in the incoming/subducting Philippine Sea plate off the Kii Peninsula, central Nankai trough, Journal of Geophysical Research, v. 110,
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Takahashi, N., Kodaira, S., Park, J., Deibold, J., 2003, Heterogeneous structure of western Nankai seismogenic zone deduced by multichannel reflection data and wide-angle seismic data,
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Mitsui, N., Hirahara, K., 2004, Simple spring-mass Model simulation of earthquake cycle along the Nankai Trough in Southwest Japan, Pure Applied Geophysics, v. 161, pp. 243302450.
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Zang, S., Chen, Q., Ning, J., Shen, Z., Liu, Y., 2002, Motion of the Philippine Sea plate consistent with NUVEL-1A model, Geophyiscal Journal International, v. 150, pp. 809â819.
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Steurer, J., Underwood, M, 2003, Clay mineralogy of mudstone from the Nankai Trough reference sites 1173 and 1177 and frontal accretionary prism site 1174, Ms 190SR-211,
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Obana, K., Kodaira, S., Kaneda, Y., 2006, Seismicity related to heterogeneous structure along the western Nankai trough off Shikoku Island, Geophysical Research Letters,
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440:
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Colwell, F., Matsumoto, R., Reed, D., 2004, A Review of gas hydrate, geology and biology of the Nankai Trough, Chemical Geology, v. 205, pp. 391â404.
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At depth in the ocean bottoms, in some cases water can form an ice-like solid structure that has methane trapped in its crystalline lattice, forming
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Conventional geologic estimates of plate movement velocities are difficult in the Nankai Trough because there are no spreading ridges that bound the
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Sella, G., Dixon, T., Mao, A., 2002, REVEL: A model for Recent plate velocities from space geodesy, Journal of Geophysical Research, v. 107, n. B4,
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Baba, T., Cummins, P. R., 2005, Contiguous rupture area of two Nankai Trough earthquakes revealed by high resolution tsunami waveform inversion,
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Distribution of identified gas hydrate locations, in green and the location of selected subduction zones, red lines, modefied from Collet, 2002.
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469:"Hot fluids, burial metamorphism and thermal histories in the underthrust sediments at IODP 370 site C0023, Nankai Accretionary Complex"
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Pisani, P., Reshef, M., Moore, G., 2005, Targeted 3-D prestack depth imaging at Legs 190-196 ODP drill sites (Nankai Trough, Japan),
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Collett, T. S., 2002, Energy resources potential of natural gas hydrates, AAPG Bulletin, v. 86, pp. 1971â92.
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Scientists, Verena B. Heuer; Fumio Inagaki; Yuki Morono; Yusuke Kubo; Lena Maeda; and the Expedition 370 (2017).
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Krason, 1994, Study of 21 marine basins indicates wide prevalence of hydrates, Offshore, August, pp. 34â35.
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data. Historically, the most recent large-scale earthquake to occur in the Nankai Trough was in 1944 off the
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Depth of earthquake foci in cross section, modified from Obana, et al., 2002
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clathrate. Nevertheless as of 2014 there is no commercial exploitation.
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opposed to non-subducting sediments (Saffer et al., 2005).
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Undersea geographic features of the western Pacific
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43:This article
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989:Japan Trench
966:Kuril Trench
914:Nojima Fault
874:Fukozu Fault
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609:Supplements.
548:cite journal
537:. Retrieved
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435:cite journal
424:. Retrieved
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389:. Retrieved
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329:gas hydrates
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44:
1018:Philippines
934:Tanna Fault
929:Senya Fault
293:bathymetric
249:decollement
145:hydrocarbon
1058:Categories
851:rift zones
794:Amur Plate
769:North Asia
565:References
539:2019-10-24
496:2164/13157
479:: 104080.
426:2019-10-24
391:2016-09-08
359:Subduction
289:seismicity
276:earthquake
261:Seismicity
232:turbidites
123:region of
58:footnoting
505:0264-8172
279:in 2000 (
954:Trenches
613:153â177.
348:See also
236:smectite
215:Eurasian
121:NankaidĆ
54:citation
958:troughs
297:seismic
230:-wedge
1036:Others
847:Faults
503:
228:trench
135:, the
129:Honshu
117:trough
975:Japan
819:Small
786:Large
133:fault
125:Japan
103:ćæ”·ăă©ă
956:and
849:and
767:and
765:East
554:link
501:ISSN
445:link
441:link
365:Note
281:IODP
254:IODP
148:fuel
96:The
56:and
763:of
683:doi
655:doi
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491:hdl
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157:In
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