Paleogeographic reconstruction and origin of the Philippine Sea

Seno, Tetsuzo; Maruyama, Shigenori

doi:10.1016/0040-1951(84)90008-8

Cited by 505 publications

(335 citation statements)

References 28 publications

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“…As a part of PHS the buoyant Izu-Bonin volcanic arc was transported northward 17-2 my ago to collide with and indent Honshu to form the Izu collision zone, a process that affects the current tectonics of the Kanto Plain. At present PHS moves at a rate of about 30 mm/yr in the NW direction under the Kanto area and about 40 mm/yr toward WNW in Tokai whereas PAC subducts westward at about 10 cm/yr [Seno and Maruyama, 1984]. Three-dimensional seismicity shown in Figure 2 and in the auxiliary material reveals the 3-D general plate geometry under Kanto.…”

Section: Introductionmentioning

confidence: 86%

“…Although globally not common, isolated cases exist where subducting plates come into contact, for example, in Espanola [Dolan et al, 1998] and in Ontong-Java [Mann and Taira, 2004]; but the interaction of PHS and PAC under Kanto is clearly more extensive and better delineated [Noguchi, 1998;Sekiguchi, 2001;Sato et al, 2005]. The PHS moved in a northerly direction until about 2 my ago [Seno and Maruyama, 1984] or as recent as 1 my [Yamaji, 2000] when it changed to a WNW direction. As a part of PHS the buoyant Izu-Bonin volcanic arc was transported northward 17-2 my ago to collide with and indent Honshu to form the Izu collision zone, a process that affects the current tectonics of the Kanto Plain.…”

Section: Introductionmentioning

confidence: 99%

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Interaction between two subducting plates under Tokyo and its possible effects on seismic hazards

Okaya

Sato

et al. 2007

Geophysical Research Letters

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Underneath metropolitan Tokyo the Philippine Sea plate (PHS) subducts to the north on top of the westward subducting Pacific plate (PAC). New, relatively high‐resolution tomography images the PHS as a well‐defined subduction zone under western Kanto Plain. As PAC shoals under eastern Kanto, the PHS lithosphere is being thrusted into an increasingly tighter space of the PAC‐Eurasian mantle wedge. As a result, zones of enhanced seismicity appear under eastern Kanto at the top of PHS, internal to PHS and also at its contact with PAC. These zones are located at depths greater than the causative fault of the disastrous 1923 Great Tokyo “megathrust” earthquake, in the vicinity of several well‐located historical, damaging (M6 and M7) earthquakes. Thus a rather unique interaction between subducting plates under Tokyo may account for additional seismic hazards in metropolitan Tokyo.

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Section: Introductionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Interaction between two subducting plates under Tokyo and its possible effects on seismic hazards

Okaya

Sato

et al. 2007

Geophysical Research Letters

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“…The Philippine Sea is one of the major marginal seas complexes of the western Pacific ( The basins in the eastern part of the Philippine Sea have been formed by successive episodes of west to east opening [Karig, 1971;Seno and Maruyama, 1984]. Many evolutionary models have been based on the identification of magnetic lineation in the SB [e.g., Kobayashi and Nakada, 1978;Shih, 1980a].…”

Section: Introductionmentioning

confidence: 99%

The Philippine Sea: New survey results reveal the structure and the history of the marginal basins

Okino¹,

Ohara²,

Kasuga³

et al. 1999

Geophysical Research Letters

249

227

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Abstract. The Hydrographic Department of Japan initiated a long-term geological and geophysical survey of the Philippine Sea in 1983. We here summarize the bathymetry and magnetic anomalies of this area, focusing on the structure and the evolutionary process of the marginal basins. The Shikoku and Parece Vela Basins developed as one backarc system in the later phase of their formation; the significant difference between the two basins, however, is clearest near the extinct spreading centers. The steep Oki-Daito Escarpment, located in the northern West Philippine Basin, was mapped for the first time during this survey. The N-S trending spreading fabric north of the escarpment is in striking contrast to the NW-SE to E-W lineament in the south. Our data reveal a more complicated history of the western Philippine Sea than has been prot•osed in previous studies.

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“…This result is consistent with DSDP results from the West Philippine Basin (as summarized in fig. 3 of Seno and Maruyama, 1984), which also suggests ~ 15° of northward translation since the middle Oligocene.…”

Section: Paleolatitudementioning

confidence: 85%

Site 793

1990

Proceedings of the Ocean Drilling Program

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We spudded Hole 793A with the advanced hydraulic piston corer (APC) at 1745 hr on 26 May 1989 and cored 99.7 m with 79% recovery until an overpull and resulting severed piston rod ended operations at the hole. A reentry cone was spudded into the sediment at 0930 hr on 28 May, and Hole 793B was begun by drilling a 14-3 A-in. hole to 586.5 mbsf, which was then lined with 46 joints (562.66 m) of ll-3 /4-in. casing. We obtained special permission not to core this section so that we could meet the deep stratigraphic and basement objectives in the time available. We took 114 rotary core barrel (RCB) cores during the next 12 days, with a pipe trip and subsequent reentry after Core 126-793B-87R (1422.9 mbsf) to change the drill bit. At 0320 hr on 14 June, Hole 793B reached a total penetration of 1682 mbsf, with 74% recovery in the sediments above 1403.9 mbsf and 33% recovery in the basement below.Following a pipe trip to release the bit and add a casing landing tool, a full suite of geophysical and geochemical logs, including the formation microscanner (FMS) and vertical seismic profiling (VSP), was planned. Several bridges were encountered, which required clearing with the pipe, so the hole was logged in stages. The density tool failed. The other physical property and temperature tools logged the intervals 1565.6-1034, 947.8-775.9, and 708.2-586.5 mbsf. The FMS was run from 1539 to 1034 mbsf and from 764.1 to 586.5 mbsf. The geochemistry combination was used in the open hole from 1531 to 1034 mbsf, and through the pipe from 917 to 586.5 mbsf. Poor clamping, a result of formation conditions, limited an attempted VSP to only a few good recording levels.We defined seven lithostratigraphic units at Site 793: Unit I (0-98.9 mbsf): Quaternary pumiceous gravel, sandy gravel, and vitric sand; nannofossil clay, clayey silt, and silty clay; and nannofossil-rich clayey silt and clay, with rare vitric sand and silt.Unit II (586.5-591 mbsf): olivine-clinopyroxene diabase. Unit III (591-735.7 mbsf): lower to middle Miocene nannofossilrich silty claystone, silty claystone, nannofossil-rich and nannofossil claystone, vitric siltstone and sandstone, clayey siltstone, and nannofossil-rich clayey siltstone.Unit IV (735.7-759 mbsf): lower Miocene claystone, nannofossil and nannofossil-rich claystone, and vitric siltstone. SITE 793Unit V (759-1373.1 mbsf): lower to upper Oligocene vitric sandstone, pumiceous sandstone, granule-to fine-pebble conglomerate, siltstone, clayey siltstone, and silty claystone.Unit VI (1373.1-1403.9 mbsf): upper-lower Oligocene(?) very poorly sorted volcanic breccia with sandy matrix, and mixed fresh to altered clasts of mainly plagioclase-rich andesite.Unit VII (1403.9-1678.4 mbsf): upper-lower Oligocene(?) breccias and massive to pillowed flows of porphyritic and aphyric clinopyroxene-orthopyroxene basaltic andesites and andesites. Note that this unit is subdivided into 17 igneous rock units in the "Igneous Petrology" section (this chapter).We dated Units I and III-V by means of nannofossils, radiolarians (Unit...

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Paleogeographic reconstruction and origin of the Philippine Sea

Cited by 505 publications

References 28 publications

Interaction between two subducting plates under Tokyo and its possible effects on seismic hazards

Interaction between two subducting plates under Tokyo and its possible effects on seismic hazards

The Philippine Sea: New survey results reveal the structure and the history of the marginal basins

Site 793

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