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首页> 外文期刊>Chinese science bulletin >Characteristics of the crystal structure and hypocentral tectonics in the epicentral area of Nan'ao earthquake (M7.5), the northeastern South China Sea
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Characteristics of the crystal structure and hypocentral tectonics in the epicentral area of Nan'ao earthquake (M7.5), the northeastern South China Sea

机译：南海东北部南澳地震（M7.5）震中区的晶体结构和低中心构造特征

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摘要

1918 Nan'ao earthquake (M7.5) occurred in the northeast coastal areas of Guangdong Province. With the seismogeoiogical survey of the epicentral area and history materials analyses, the earthquake epicenter was estimated to locate in the intersection part of the Binhai fault zone (Littoral) and Huanggangshui fault, which strikes NEE and NW, respectively. The activities of the NEE-striking thrust fault and NW-striking extensional fault that -were attributed to 1918 Nan'ao earthquake occurred in the Dongshan Island of the epicentral area; they reflected the focal stress field with compression in NW-SE direction and extension in NE-SW direction. The isoseismal contour of seismic intensity X shows a shape of X composed of two mutually overlapping ellipses with two axes striking NEE and NW, respectively, and such shape implies that the occurrence of this earthquake is controlled by a pair of conjugate seismotectonic faults constituted by the NEE-striking Binhai fault zone and the NW-striking Huanggangshui fault. The Binhai fault zone is a dominant seis-mogenic structure, and the NW-striking Huanggang-shui fault is the subdominant one. The onshore offshore deep seismic profile that crossed the epicentral area and was perpendicular to the strike of the Binhai fault zone was obtained. According to the analyses of the seismic data, the Binhai fault zone is defined as a low velocity zone with SE dip-slip in the crustal structure section. The Binhai fault zone is a boundary fault between the South China subplate and South China Sea subplate. The crust structure -on the northwest side of Binhai fault zone is a normal continental crust with a thickness of 30 km, and the one on the southeast side of the fault zone is a thinning continental crust with a thickness of 25-28 km. The Binhai fault zone is an important seismogenic fault and also is an earthquake-controlling fault. The intersection part between the Binhai fault zone and the low velocity zone of upper crust is advantageous to stress concentration and strain energy accumulation, and presents the deep dynamic conditions for the earthquake's pregnancy and occurrence.
机译：1918年，广东省东北沿海地区发生南澳地震（M7.5）。通过对震中地区的地震学调查和历史资料分析，估计地震震中位于滨海断裂带（沿海）和黄冈水断裂的相交部分，分别袭击了东北东和西北。 1918年南澳地震引起的NEE冲断断层和NW冲断伸展断层活动发生在震中地区东山岛。它们通过在NW-SE方向上压缩和在NE-SW方向上扩展反映了焦点应力场。地震烈度X的等震轮廓表示X的形状是由两个相互重叠的椭圆组成，椭圆的两个轴分别撞击NEE和NW，这表明该地震的发生是由一对共轭地震构造断层控制的，该断层由东北走向的滨海断裂带和西北走向的黄冈水断裂带。滨海断裂带是主要的成矿构造，西北走向的黄冈水断裂带是次要构造。获得了跨过震中区并垂直于滨海断裂带走向的陆上深海地震剖面。根据地震资料分析，将滨海断层带定义为地壳构造区具有东南倾滑的低速带。滨海断裂带是华南板块与南海板块之间的边界断层。滨海断裂带西北侧的地壳结构是一块厚度为30 km的正常大陆壳，而断裂带东南侧的壳结构是厚度为25-28 km的稀薄大陆壳。滨海断裂带是重要的发震断层，也是控制地震的断层。滨海断裂带与上地壳低速带的交汇处有利于应力集中和应变能的积累，为地震孕育和发生提供了深层的动力学条件。

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