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首页> 外文期刊>Chinese science bulletin >Characteristics of the crustal 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 crustal 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）震中区地壳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 seismogeological 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 Huanggangshui 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
机译：1918年，广东省东北沿海地区发生了南澳地震（M7.5）。通过对震中地区的地震地质调查和历史资料分析，地震震中估计位于滨海断裂带（沿海）和黄岗水断裂的交汇处，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的等震等值线显示了由两个相互重叠的椭圆组成的“ X”形，两个椭圆分别沿NEE和NW撞击两个轴，这表明该地震的发生是由构成一对共轭地震构造断层控制的由NEE袭击的滨海断裂带和NW袭击的黄冈水断裂带组成。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。获得了横穿震中区并垂直于滨海断裂带走向的陆上-海上深地震剖面。根据地震资料分析，将滨海断裂带定义为东南向滑移为SE的低速带。

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