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  • 1
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    Imaging the seismic structure and stress field in the source region of the 2004 mid-Niigata prefecture earthquake: Structural zones of weakness and seismogenic stress concentration by ductile flow (2006)
    In:  J. Geophys. Res., Amsterdam, Univ. Tokyo, vol. 111, no. B8, pp. 1-18, pp. B08308, (ISSN: 1340-4202)
    Details
    Publication Date: 2006
    Keywords: Tomography ; Seismics (controlled source seismology) ; Stress ; Earthquake ; Rheology ; Japan ; JGR ; 7230 ; Seismology: ; Seismicity ; and ; tectonics ; 7270 ; Tomography ; 8164 ; Tectonophysics: ; Stresses: ; crust ; and ; lithosphere ; 8012 ; Structural ; Geology: ; High ; strain ; deformation ; zones ; 8015 ; Local ; crustal ; structure
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    The global distribution of pure anorthosite on the Moon (2009)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2009-09-11
    Description: It has been thought that the lunar highland crust was formed by the crystallization and floatation of plagioclase from a global magma ocean, although the actual generation mechanisms are still debated. The composition of the lunar highland crust is therefore important for understanding the formation of such a magma ocean and the subsequent evolution of the Moon. The Multiband Imager on the Selenological and Engineering Explorer (SELENE) has a high spatial resolution of optimized spectral coverage, which should allow a clear view of the composition of the lunar crust. Here we report the global distribution of rocks of high plagioclase abundance (approaching 100 vol.%), using an unambiguous plagioclase absorption band recorded by the SELENE Multiband Imager. If the upper crust indeed consists of nearly 100 vol.% plagioclase, this is significantly higher than previous estimates of 82-92 vol.% (refs 2, 6, 7), providing a valuable constraint on models of lunar magma ocean evolution.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ohtake, Makiko -- Matsunaga, Tsuneo -- Haruyama, Junichi -- Yokota, Yasuhiro -- Morota, Tomokatsu -- Honda, Chikatoshi -- Ogawa, Yoshiko -- Torii, Masaya -- Miyamoto, Hideaki -- Arai, Tomoko -- Hirata, Naru -- Iwasaki, Akira -- Nakamura, Ryosuke -- Hiroi, Takahiro -- Sugihara, Takamitsu -- Takeda, Hiroshi -- Otake, Hisashi -- Pieters, Carle M -- Saiki, Kazuto -- Kitazato, Kohei -- Abe, Masanao -- Asada, Noriaki -- Demura, Hirohide -- Yamaguchi, Yasushi -- Sasaki, Sho -- Kodama, Shinsuke -- Terazono, Junya -- Shirao, Motomaro -- Yamaji, Atsushi -- Minami, Shigeyuki -- Akiyama, Hiroaki -- Josset, Jean-Luc -- England -- Nature. 2009 Sep 10;461(7261):236-40. doi: 10.1038/nature08317.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshino-dai, Sagamihara, Kanagawa 229-8510, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19741704" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 3
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    Mass and local topography measurements of Itokawa by Hayabusa (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-06-03
    Description: The ranging instrument aboard the Hayabusa spacecraft measured the surface topography of asteroid 25143 Itokawa and its mass. A typical rough area is similar in roughness to debris located on the interior wall of a large crater on asteroid 433 Eros, which suggests a surface structure on Itokawa similar to crater ejecta on Eros. The mass of Itokawa was estimated as (3.58 +/- 0.18) x 10(10) kilograms, implying a bulk density of (1.95 +/- 0.14) grams per cubic centimeter for a volume of (1.84 +/- 0.09) x 10(7) cubic meters and a bulk porosity of approximately 40%, which is similar to that of angular sands, when assuming an LL (low iron chondritic) meteorite composition. Combined with surface observations, these data indicate that Itokawa is the first subkilometer-sized small asteroid showing a rubble-pile body rather than a solid monolithic asteroid.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Abe, Shinsuke -- Mukai, Tadashi -- Hirata, Naru -- Barnouin-Jha, Olivier S -- Cheng, Andrew F -- Demura, Hirohide -- Gaskell, Robert W -- Hashimoto, Tatsuaki -- Hiraoka, Kensuke -- Honda, Takayuki -- Kubota, Takashi -- Matsuoka, Masatoshi -- Mizuno, Takahide -- Nakamura, Ryosuke -- Scheeres, Daniel J -- Yoshikawa, Makoto -- New York, N.Y. -- Science. 2006 Jun 2;312(5778):1344-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Graduate School of Science and Technology, Kobe University, Nada, Kobe 657-8501, Japan. avell@kobe-u.ac.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16741111" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
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    Detailed images of asteroid 25143 Itokawa from Hayabusa (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-06-03
    Description: Rendezvous of the Japanese spacecraft Hayabusa with the near-Earth asteroid 25143 Itokawa took place during the interval September through November 2005. The onboard camera imaged the solid surface of this tiny asteroid (535 meters by 294 meters by 209 meters) with a spatial resolution of 70 centimeters per pixel, revealing diverse surface morphologies. Unlike previously explored asteroids, the surface of Itokawa reveals both rough and smooth terrains. Craters generally show unclear morphologies. Numerous boulders on Itokawa's surface suggest a rubble-pile structure.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Saito, J -- Miyamoto, H -- Nakamura, R -- Ishiguro, M -- Michikami, T -- Nakamura, A M -- Demura, H -- Sasaki, S -- Hirata, N -- Honda, C -- Yamamoto, A -- Yokota, Y -- Fuse, T -- Yoshida, F -- Tholen, D J -- Gaskell, R W -- Hashimoto, T -- Kubota, T -- Higuchi, Y -- Nakamura, T -- Smith, P -- Hiraoka, K -- Honda, T -- Kobayashi, S -- Furuya, M -- Matsumoto, N -- Nemoto, E -- Yukishita, A -- Kitazato, K -- Dermawan, B -- Sogame, A -- Terazono, J -- Shinohara, C -- Akiyama, H -- New York, N.Y. -- Science. 2006 Jun 2;312(5778):1341-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Hayabusa Project Team, Institute of Space and Astronautical Sciences (ISAS), Japan Aerospace Exploration Agency (JAXA), 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan. saitoj@planeta.sci.isas.jaxa.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16741110" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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    Regolith migration and sorting on asteroid Itokawa (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-04-21
    Description: High-resolution images of the surface of asteroid Itokawa from the Hayabusa mission reveal it to be covered with unconsolidated millimeter-sized and larger gravels. Locations and morphologic characteristics of this gravel indicate that Itokawa has experienced considerable vibrations, which have triggered global-scale granular processes in its dry, vacuum, microgravity environment. These processes likely include granular convection, landslide-like granular migrations, and particle sorting, resulting in the segregation of the fine gravels into areas of potential lows. Granular processes become major resurfacing processes because of Itokawa's small size, implying that they can occur on other small asteroids should those have regolith.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Miyamoto, Hideaki -- Yano, Hajime -- Scheeres, Daniel J -- Abe, Shinsuke -- Barnouin-Jha, Olivier -- Cheng, Andrew F -- Demura, Hirohide -- Gaskell, Robert W -- Hirata, Naru -- Ishiguro, Masateru -- Michikami, Tatsuhiro -- Nakamura, Akiko M -- Nakamura, Ryosuke -- Saito, Jun -- Sasaki, Sho -- New York, N.Y. -- Science. 2007 May 18;316(5827):1011-4. Epub 2007 Apr 19.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Museum Collection Utilization Studies, University Museum, University of Tokyo, Hongo 7-3-1, Bunkyoku, Tokyo 113-0033, Japan. hm@um.u-tokyo.ac.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17446355" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
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    Earthquake source fault beneath Tokyo (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-07-16
    Description: Devastating earthquakes occur on a megathrust fault that underlies the Tokyo metropolitan region. We identify this fault with use of deep seismic reflection profiling to be the upper surface of the Philippine Sea plate. The depth to the top of this plate, 4 to 26 kilometers, is much shallower than previous estimates based on the distribution of seismicity. This shallower plate geometry changes the location of maximum finite slip of the 1923 Kanto earthquake and will affect estimations of strong ground motion for seismic hazards analysis within the Tokyo region.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sato, Hiroshi -- Hirata, Naoshi -- Koketsu, Kazuki -- Okaya, David -- Abe, Susumu -- Kobayashi, Reiji -- Matsubara, Makoto -- Iwasaki, Takaya -- Ito, Tanio -- Ikawa, Takeshi -- Kawanaka, Taku -- Kasahara, Keiji -- Harder, Steven -- New York, N.Y. -- Science. 2005 Jul 15;309(5733):462-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Earthquake Research Institute (ERI), University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16020734" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
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  • 7
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    The rubble-pile asteroid Itokawa as observed by Hayabusa (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-06-03
    Description: During the interval from September through early December 2005, the Hayabusa spacecraft was in close proximity to near-Earth asteroid 25143 Itokawa, and a variety of data were taken on its shape, mass, and surface topography as well as its mineralogic and elemental abundances. The asteroid's orthogonal axes are 535, 294, and 209 meters, the mass is 3.51 x 10(10) kilograms, and the estimated bulk density is 1.9 +/- 0.13 grams per cubic centimeter. The correspondence between the smooth areas on the surface (Muses Sea and Sagamihara) and the gravitationally low regions suggests mass movement and an effective resurfacing process by impact jolting. Itokawa is considered to be a rubble-pile body because of its low bulk density, high porosity, boulder-rich appearance, and shape. The existence of very large boulders and pillars suggests an early collisional breakup of a preexisting parent asteroid followed by a re-agglomeration into a rubble-pile object.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fujiwara, A -- Kawaguchi, J -- Yeomans, D K -- Abe, M -- Mukai, T -- Okada, T -- Saito, J -- Yano, H -- Yoshikawa, M -- Scheeres, D J -- Barnouin-Jha, O -- Cheng, A F -- Demura, H -- Gaskell, R W -- Hirata, N -- Ikeda, H -- Kominato, T -- Miyamoto, H -- Nakamura, A M -- Nakamura, R -- Sasaki, S -- Uesugi, K -- New York, N.Y. -- Science. 2006 Jun 2;312(5778):1330-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan. fujiwara@planeta.sci.isas.jaxa.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16741107" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
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  • 8
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    Pole and global shape of 25143 Itokawa (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-06-03
    Description: The locations of the pole and rotation axis of asteroid 25143 Itokawa were derived from Asteroid Multiband Imaging Camera data on the Hayabusa spacecraft. The retrograde pole orientation had a right ascension of 90.53 degrees and a declination of -66.30 degrees (52000 equinox) or equivalently 128.5 degrees and -89.66 degrees in ecliptic coordinates with a 3.9 degrees margin of error. The surface area is 0.393 square kilometers, the volume is 0.018378 cubic kilometers with a 5% margin of error, and the three axis lengths are 535 meters by 294 meters by 209 meters. The global Itokawa revealed a boomerang-shaped appearance composed of two distinct parts with partly faceted regions and a constricted ring structure.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Demura, Hirohide -- Kobayashi, Shingo -- Nemoto, Etsuko -- Matsumoto, Naoya -- Furuya, Motohiro -- Yukishita, Akira -- Muranaka, Noboru -- Morita, Hideo -- Shirakawa, Ken -- Maruya, Makoto -- Ohyama, Hiroshi -- Uo, Masashi -- Kubota, Takashi -- Hashimoto, Tatsuaki -- Kawaguchi, Jun'ichiro -- Fujiwara, Akira -- Saito, Jun -- Sasaki, Sho -- Miyamoto, Hideaki -- Hirata, Naru -- New York, N.Y. -- Science. 2006 Jun 2;312(5778):1347-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Computer Software, University of Aizu, Ikki-machi, Aizu-Wakamatsu City, Fukushima 965-8580, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16741112" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
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  • 9
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    Long-lived volcanism on the lunar farside revealed by SELENE Terrain Camera (2008)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2008-11-08
    Description: We determined model ages of mare deposits on the farside of the Moon on the basis of the crater frequency distributions in 10-meter-resolution images obtained by the Terrain Camera on SELENE (Selenological and Engineering Explorer) (Kaguya). Most mare volcanism that formed mare deposits on the lunar farside ceased at approximately 3.0 billion years ago, suggesting that mare volcanism on the Moon was markedly reduced globally during this period. However, several mare deposits at various locations on the lunar farside also show a much younger age, clustering at approximately 2.5 billion years ago. These young ages indicate that mare volcanism on the lunar farside lasted longer than was previously considered and may have occurred episodically.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Haruyama, Junichi -- Ohtake, Makiko -- Matsunaga, Tsuneo -- Morota, Tomokatsu -- Honda, Chikatoshi -- Yokota, Yasuhiro -- Abe, Masanao -- Ogawa, Yoshiko -- Miyamoto, Hideaki -- Iwasaki, Akira -- Pieters, Carle M -- Asada, Noriaki -- Demura, Hirohide -- Hirata, Naru -- Terazono, Junya -- Sasaki, Sho -- Saiki, Kazuto -- Yamaji, Atsushi -- Torii, Masaya -- Josset, Jean-Luc -- New York, N.Y. -- Science. 2009 Feb 13;323(5916):905-8. doi: 10.1126/science.1163382. Epub 2008 Nov 6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshino-dai, Sagamihara, Kanagawa 229-8510, Japan. haruyama.junichi@jaxa.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18988811" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
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  • 10
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    Anomalous Seismic Attenuation along the Plate Collision Boundary in Southeastern Taiwan: Observations from a Linear Seismic Array (2009)
    Seismological Society of America
    Details
    Publication Date: 2009-09-23
    Description: Lateral variations of seismic attenuation are investigated using data from a linear seismic array deployed across southern Taiwan. The attenuation parameter t (super *) is obtained by fitting the amplitude spectra of P and S waves with a theoretical spectrum using an omega (super 2) model. The observed t (super *) data are then plotted against the travel time, back azimuth, and focal depth, respectively, to explore the spatial variations of t (super *) for P and S waves. Significant lateral variations of seismic attenuation are found between the eastern mountainous and western plain areas of Taiwan. Large attenuation contrast with depth in the east indicates that an anomalously high-attenuation zone is located in a shallower area north of the array in southeastern Taiwan. A 2D raytracing method is applied to show that the probable depth of the anomalous zone is at about 15-20 km. This anomalous attenuation zone coincides with an area marked by low-P and low-S velocities as well as a total absence of seismicity. The area is also marked by other prominent manifestations of active collision between the Eurasian and Philippine Sea plates, for example, high mountain ranges, rapid uplift, and high heat flows.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences , Physics
    Published by Seismological Society of America
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