Nondestructive continuous physical property measurements of core samples recovered from hole B, Taiwan Chelungpu-Fault Drilling Project
Nondestructive continuous physical property measurements of core samples recovered from hole B, Taiwan Chelungpu-Fault Drilling Project
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DOI：
10.1029/2006jb004738
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发表时间：
2007-07
影响因子：
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通讯作者：
T. Hirono;E. Yeh;Weiren Lin;H. Sone;T. Mishima;W. Soh;Y. Hashimoto;O. Matsubayashi;K. Aoike;Hisao Itô;M. Kinoshita;M. Murayama;Sheng-rong Song;K. Ma;J. Hung;C. Wang;Y. Tsai;T. Kondo;M. Nishimura;S. Moriya;Tomoyuki Tanaka;Toru Fujiki;L. Maeda;H. Muraki;T. Kuramoto;Sugiyama Kazuhiro;Toshikatsu Sugawara
中科院分区：
文献类型：
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作者：
T. Hirono;E. Yeh;Weiren Lin;H. Sone;T. Mishima;W. Soh;Y. Hashimoto;O. Matsubayashi;K. Aoike;Hisao Itô;M. Kinoshita;M. Murayama;Sheng-rong Song;K. Ma;J. Hung;C. Wang;Y. Tsai;T. Kondo;M. Nishimura;S. Moriya;Tomoyuki Tanaka;Toru Fujiki;L. Maeda;H. Muraki;T. Kuramoto;Sugiyama Kazuhiro;Toshikatsu Sugawara
[1] 台湾车笼埔断层钻探项目于2002年开展，旨在调查1999年台湾集集7.6级地震的断层机制。 B孔穿透车笼堡断层，在948.42米至1352.60米深度之间回收岩心样品。三个主要区域，即 FZB1136（B 孔深度 1136 米的断层带）、FZB1194 和 FZB1243，在岩心样本中被识别为车笼埔断层内的活动断层带。对所有岩心样本进行的无损连续物理性质测量表明，三个主要断层带具有低伽马射线衰减（GRA）密度和高磁化率的特征。断层带内的广泛断裂和裂纹和/或高原子序数原子的损失（但不是测量伪影）可能导致低 GRA 密度，而高磁化率值可能是由于顺磁性矿物通过摩擦加热形成磁性矿物造成的。小断层带的特点是 GRA 密度低，磁化率没有变化，后者可能表明这些小断层带经历了相对较低的摩擦热。断层带的磁化率可能是确定断层地震期间发生摩擦生热的关键。
[1] The Taiwan Chelungpu-Fault Drilling Project was undertaken in 2002 to investigate the faulting mechanism of the 1999 Mw 7.6 Taiwan Chi-Chi earthquake. Hole B penetrated the Chelungpu fault, and core samples were recovered from between 948.42- and 1352.60-m depth. Three major zones, designated FZB1136 (fault zone at 1136-m depth in hole B), FZB1194, and FZB1243, were recognized in the core samples as active fault zones within the Chelungpu fault. Nondestructive continuous physical property measurements, conducted on all core samples, revealed that the three major fault zones were characterized by low gamma ray attenuation (GRA) densities and high magnetic susceptibilities. Extensive fracturing and cracks within the fault zones and/or loss of atoms with high atomic number, but not a measurement artifact, might have caused the low GRA densities, whereas the high magnetic susceptibility values might have resulted from the formation of magnetic minerals from paramagnetic minerals by frictional heating. Minor fault zones were characterized by low GRA densities and no change in magnetic susceptibility, and the latter may indicate that these minor zones experienced relatively low frictional heating. Magnetic susceptibility in a fault zone may be key to the determination that frictional heating occurred during an earthquake on the fault.