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首页> 外文期刊>Journal of Asian earth sciences >Paleoseismic evidence for coseismic growth-fold in the 1999 Chichi earthquake and earlier earthquakes, central Taiwan
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Paleoseismic evidence for coseismic growth-fold in the 1999 Chichi earthquake and earlier earthquakes, central Taiwan

机译：台湾中部1999年Chichi地震和早期地震的同震增长倍数的古地震证据

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摘要

The 1999 Chichi earthquake ruptured along previously unrecognized traces of the Chelungpu fault, because the traces were covered with thick-bedded fluvial, alluvial, and colluvial deposits. The earthquake created a 95-km-long surface rupture and associated fault-related fold scarps. This study focused on the fault-related fold at two locations, where the fold scarp is characterized with trench excavation and shallow cored boring results. The structural characteristics revealed by the two trench sites are consistent with a trishear fault-propagation fold growth above a blind thrust. Several characteristics of the fold observed in the Holocene deposits show smoothly rounded fold-hinges, unconformities, onlapped structure, and downward steepening of forelimb strata. Results from these structures suggest that the fold grows by progressive limb rotation of growth strata in sequential coseismic growth episodes. The growth strata show several unconformable contacts as indicated by paleosoil horizons developed on event horizons. Based on the syntectonic sedimentary structure, three events are revealed at the Siangong-Temple site and two paleoearthquake events on the Shijia site. Integration with the two trenches and the previous studies suggests the three paleoearthquake events occurred 300-430, 710-800, and 1710-1900 yr B.P. These data on the two trench sites indicate that the average slip rate is 4.2 and 4.5 mm/yr, respectively.
机译：1999年的Chichi地震沿以前无法识别的Chelungpu断裂痕迹破裂，因为痕迹上覆盖着厚厚的河流，冲积和冲积沉积物。地震造成了95公里长的表面破裂以及与断裂有关的褶皱陡峭。这项研究集中在两个位置的与断层有关的褶皱上，褶皱陡峭的特征是沟槽开挖和浅芯钻孔。由两个沟槽位置揭示的结构特征与盲冲之上的三剪切断层传播褶皱生长一致。在全新世沉积物中观察到的褶皱的几个特征显示出褶皱光滑，不整合，重叠结构以及前肢地层向下变陡。这些结构的结果表明，在连续的同震生长阶段，褶皱通过生长层的渐进肢体旋转而增长。如事件层上发育的古土壤层所示，生长层显示出几种不整合的接触。根据构造的沉积结构，在三公庙遗址揭示了三个事件，在石家遗址揭示了两个古地震事件。与这两个海沟的整合以及先前的研究表明，这三个古地震发生在公元前300-430年，710-800年和1710-1900年。这些在两个沟槽位置的数据表明平均滑移率分别为4.2和4.5 mm / yr。

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