Spatial and temporal evolution of the megasplay fault in the Nankai Trough

被引:76
作者
Kimura, Gaku [1 ]
Moore, Gregory F. [2 ]
Strasser, Michael [3 ]
Screaton, Elizabeth [4 ]
Curewitz, Daniel [5 ]
Streiff, Carolyn [6 ]
Tobin, Harold [6 ]
机构
[1] Univ Tokyo, Grad Sch Sci, Dept Earth & Planetary Sci, Bunkyo Ku, Tokyo 1130033, Japan
[2] Univ Hawaii Manoa, Dept Geol & Geophys, Honolulu, HI 96822 USA
[3] Univ Bremen, Res Ctr Ocean Margins, D-28359 Bremen, Germany
[4] Univ Florida, Dept Geol Sci, Gainesville, FL 32611 USA
[5] Syracuse Univ, Heroy Geol Lab, Syracuse, NY 13244 USA
[6] Univ Wisconsin, Dept Geosci, Madison, WI 53706 USA
关键词
splay fault; Nankai Trough; earthquake; tsunami; accrerionary prism; IODP; 1944 TONANKAI EARTHQUAKE; PHILIPPINE SEA PLATE; SPLAY FAULT; ACCRETIONARY WEDGE; SLIP DISTRIBUTION; SUBDUCTION; VELOCITY; ZONE; JAPAN;
D O I
10.1029/2010GC003335
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The temporal and spatial evolution of a seismogenic megasplay fault in the Kumano area, Nankai Trough (southwest Japan), is revealed by detailed investigation of the three-dimensional structure of the shallow portions of the fault, combined with the results of drilling and dating of cores from Integrated Ocean Drilling Program (IODP) Expedition 316. The ENE striking eastern portion of the splay fault has remained active since the inception of faulting at similar to 1.95 Ma. The recent shortening rate is similar to 1 m/kyr, which represents similar to 1.5%-2.5% of the total plate convergence rate of similar to 40-65 m/kyr. The NE striking western portion of the splay fault exhibits a different mode of activity. Early stage activity (before 1.55 Ma) was similar to the eastern portion, but the fault was inactive between 1.55 and 1.24 Ma. The fault was reactivated for a short time at similar to 1.24 Ma but again ceased activity after formation of the secondary branch and has been inactive since 1.24 Ma. Cessation of splay fault activity in the western domain after 1.55 Ma may be due to collision with a seamount and resulting bending of the accretionary prism in the splay fault footwall. Continuous activity of the eastern domain of the splay fault after 1.24 Ma may be related to geometrical favorability due to reorientation of the fault after the seamount passed beneath the imbricate thrust zone, leading to initiation of slightly oblique subduction.
引用
收藏
页数:23
相关论文
共 51 条
[1]   SOURCE MECHANISMS AND TECTONIC SIGNIFICANCE OF HISTORICAL EARTHQUAKES ALONG NANKAI TROUGH, JAPAN [J].
ANDO, M .
TECTONOPHYSICS, 1975, 27 (02) :119-140
[2]  
Aoki Y., 1982, Studies in continental margin geology, American Association of Petroleum Geologists Memoir, V34, P309
[3]  
ASHI J, 2002, JAMSTEC J DEEP SEA R, V20, P1
[4]   Contiguous rupture areas of two Nankai Trough earthquakes revealed by high-resolution tsunami waveform inversion [J].
Baba, T ;
Cummins, PR .
GEOPHYSICAL RESEARCH LETTERS, 2005, 32 (08) :1-4
[5]   High precision slip distribution of the 1944 Tonankai earthquake inferred from tsunami waveforms: Possible slip on a splay fault [J].
Baba, Toshitaka ;
Cummins, Phil R. ;
Hori, Takane ;
Kaneda, Yoshiyuki .
TECTONOPHYSICS, 2006, 426 (1-2) :119-134
[6]   Broad, weak regions of the Nankai Megathrust and implications for shallow coseismic slip [J].
Bangs, N. L. B. ;
Moore, G. F. ;
Gulick, S. P. S. ;
Pangborn, E. M. ;
Tobin, H. J. ;
Kuramoto, S. ;
Taira, A. .
EARTH AND PLANETARY SCIENCE LETTERS, 2009, 284 (1-2) :44-49
[7]   Anelastic strain recovery reveals extension across SW Japan subduction zone [J].
Byrne, Timothy B. ;
Lin, Weiren ;
Tsutsumi, Akito ;
Yamamoto, Yuhji ;
Lewis, Jonathan C. ;
Kanagawa, Kyuichi ;
Kitamura, Yujin ;
Yamaguchi, Asuka ;
Kimura, Gaku .
GEOPHYSICAL RESEARCH LETTERS, 2009, 36
[8]   TSUNAMI EARTHQUAKES AND SUBDUCTION PROCESSES NEAR DEEP-SEA TRENCHES [J].
FUKAO, Y .
JOURNAL OF GEOPHYSICAL RESEARCH, 1979, 84 (NB5) :2303-2314
[9]  
Henry P., 2010, IODP SCI PROSP, V333, DOI [10.2204/iodp.sp.333.2010., DOI 10.2204/IODP.SP.333.2010]
[10]   Split Philippine Sea plate beneath Japan [J].
Ide, Satoshi ;
Shiomi, Katsuhiko ;
Mochizuki, Kimihiro ;
Tonegawa, Takashi ;
Kimura, Gaku .
GEOPHYSICAL RESEARCH LETTERS, 2010, 37