921斷層泥中奈米礦物微粒的探尋 與滑動時地層溫度標定 ;Nanometric characteristics of fault gouge on the Chi-Chi earthquake, Taiwan

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/7310

Title:	921斷層泥中奈米礦物微粒的探尋與滑動時地層溫度標定;Nanometric characteristics of fault gouge on the Chi-Chi earthquake, Taiwan
Authors:	黃秉榮;Ping-Jung Huang
Contributors:	物理研究所
Keywords:	921921
Date:	2003-06-20
Issue Date:	2009-09-22 10:54:56 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	地震發生時，所產生的能量與預期所要釋放出的能量低，因而，有自然學家推論地震發生時，滑動層中應存在單層的奈米級顆。而奈米級顆粒的存在，能使地震發生時所磨擦的能量減少。而本篇論文，發現到在921地震的滑動層中的確存在奈米級的顆粒，而奈米級的顆粒的最多的分佈範圍在10nm~40nm之間。另外，在X-光的繞射分析中，發現在滑動層中和滑動層的外圍的稜鐵礦(FeCO3)的強烈變化。在滑動層中，稜鐵礦在滑動層中，稜鐵礦幾乎消失不見，而碳酸鈣在地震的過程中，並沒太大變化，所以，推論在地震發生時滑動層當時的溫度介於兩者熔解溫度之間(580℃~894℃)。 Atomic force microscopy (AFM) and General Structure Analysis System (GSAS) program have been used to investigate the nanometric characteristics of the fault gouge in the 223.45 m cores of Chi-Chi earthquake. Nano grains were revealed in the slip zone, with a mean diameter is ~20nm, while only μm grains were found outside the slip zone. X-ray diffraction patterns were refined following the Reiveld refinement method and reveal three main structural phases, namely quartz (hexagonal P6222 symmetry of SiO2), siderite (R-3CH symmetry of FeCO3), and calcite (R –3cRS symmetry of CaCO3), respectively. Among them, FeCO3 shows a rapidly percentage reduction from being at 35% to at 4 % as the specimen were taken from depths of 223.37 m (outside of the fault gouge) to 224.45 m (the fault gouge), while the composition of CaCO3 remains essentially unchanged. This founding can be used as an indicator for the temperature of the slip zone during the earthquake.
Appears in Collections:	[Graduate Institute of Physics] Electronic Thesis & Dissertation

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