High-resolution aftershock observations in the source region of the 2004 mid-Niigata Prefecture Earthquake
High-resolution aftershock observations in the source region of the 2004 mid-Niigata Prefecture Earthquake
复制标题
2004年新泻县中部地震震源区高分辨率余震观测
DOI：
10.1186/bf03352030
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
T. J. U. G. O. T. J. S. O. Earthquake
中科院分区：
文献类型：
--
作者：
A. Kato;T. J. U. G. O. T. J. S. O. Earthquake
我们在2004年10月23日日本新潟县中期地震（逆冲断层）的震源区部署了一个非常密集的时间地震台网。地震监测网由30平方公里范围内的145个临时地震监测站组成，并在主震发生后约一个月内一直维持。利用双差定位算法反演地震到时，得到了708个地震的高精度震源。沿主震（Mw = 6.6）和最大余震（Mw = 6.3）破裂带的余震沿着分布在两个相距约5 km的60°西倾平面上。相反，10月27日的余震（Mw = 5.8）发生在一个与主震断层面共轭的倾角为25°的东倾平面上。东北边缘和西南边缘的余震多发生在浅埋区，震源面倾向东。西南地区的余震震中沿沿着N15°E排列，并相对于主震断层走向逆时针旋转约20°。这种余震走向的旋转与震源区西南部地区的背斜轴的旋转相吻合。此外，一维速度模型的台站校正分布表明，在Muikamachi断层西侧的地震速度低于东侧。上盘速度结构沿断层走向沿着变化。主震破裂区的平均速度高于上盘外围的平均速度，特别是与震源西南侧的平均速度相比。
We deployed an extremely dense temporal seismic network in the source region of the 2004 mid-Niigata Prefecture Earthquake (thrust fault) on October 23, 2004, Japan. The seismic network consisted of 145 temporary seismic stations within a 30 km squared and had been kept within approximately a month after the mainshock. High accurate hypocenters of 708 events were determined by inverting the arrival times using double-difference earthquake location algorithm. The aftershocks along the mainshock (Mw = 6.6) and the largest aftershock (Mw = 6.3) rupture zones are distributed on two 60° westward-dipping planes, located approximately 5 km apart. Conversely, the Oct. 27 aftershock (Mw = 5.8) occurred on an eastward dipping plane with a dip angle of 25° that was conjugate to the mainshock fault plane. Most of aftershocks at both northeastern and southwestern edges occurred at shallow depths with eastward-dipping planes. Epicenters of aftershocks in the southwestern region are aligned along N15°E, and rotate approximately 20° counterclockwise from the strike of the mainshock fault. This rotation of the aftershock alignments coincides with the rotation of anticline axes in the southwestern area of the source region. Furthermore, distributions of station corrections for a one-dimensional velocity model suggest that the seismic velocity at the western side of the Muikamachi-fault is lower than that at the eastern side. It is also inferred that the velocity structures in the hangingwall vary along the fault strike. The average velocity in the mainshock rupture area is higher than the periphery in the hangingwall, especially compared with the southwestern side of the hypocenter.
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2004年新泻县中部地震余震序列的短期时空变化
DOI：
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发表时间：
2005
期刊：
Earth Planets, Space 57
影响因子：
--
作者：
Kato;A.;Iwasaki;T.;Kanazawa;T.
通讯作者：
T.
DOI：
10.1186/bf03351827
发表时间：
2005-05
期刊：
Earth, Planets and Space
影响因子：
--
作者：
S. Sakai;N. Hirata;A. Kato;E. Kurashimo;T. Iwasaki;T. Kanazawa
通讯作者：
S. Sakai;N. Hirata;A. Kato;E. Kurashimo;T. Iwasaki;T. Kanazawa
DOI：
10.1186/bf03351830
发表时间：
2005-05
期刊：
Earth, Planets and Space
影响因子：
--
作者：
T. Okada;N. Umino;T. Matsuzawa;J. Nakajima;N. Uchida;T. Nakayama;S. Hirahara;T. Sato;S. Hori;T. Kono;Y. Yabe;K. Ariyoshi;S. Gamage;J. Shimizu;J. Suganomata;S. Kita;S. Yui;M. Arao;S. Hondo;T. Mizukami;H. Tsushima;T. Yaginuma;A. Hasegawa;Y. Asano;H. Zhang;C. Thurber
通讯作者：
T. Okada;N. Umino;T. Matsuzawa;J. Nakajima;N. Uchida;T. Nakayama;S. Hirahara;T. Sato;S. Hori;T. Kono;Y. Yabe;K. Ariyoshi;S. Gamage;J. Shimizu;J. Suganomata;S. Kita;S. Yui;M. Arao;S. Hondo;T. Mizukami;H. Tsushima;T. Yaginuma;A. Hasegawa;Y. Asano;H. Zhang;C. Thurber
日本中部大窝地区北部的地壳结构，根据折射/广角反射数据建模
DOI：
--
发表时间：
2004
期刊：
Earth Planets Space 56
影响因子：
--
作者：
Takeda;T.;H.Sato;T.Iwasaki;N.Matsuta;S.Sakai;T.Iidaka;A.Kato
通讯作者：
A.Kato