西秦岑北缘活断层带断层气的特征

FEATURE OF FAULT PRODUCT GAS ALONG NORTHERN MARGIN ACTIVE FAULT ZONE OF WESTERN QINLING

根据断层气实测资料，分析了西秦岑北缘活断层带断层气的特征。在垂直于断裂的地下气测线上，以活断层部位排放气体最强烈。活断层是地球排气的主要通道，断层气是地球排气的主要方式之一。同是全新世活断层，断层排气活动有强弱之分，渭河堡—南河川段断层排气活动比较强，渭河堡—洮河段断层排气活动比较弱。分析结果表明，产生差异的原因是地下水和地形的影响。

The features of the fault product gas along northern margin active fault zone of Western Qinling are analyzed on the basis of practical data. On the measuring line which is perpendicular to the fault zone, the gas escape at the part of active faut is most intense, thus it is suggested that active faults are the main channels of gas escapes in the earth, and the fault product gas is one of the main ways for air escape in earth. the different fault has the different gas escape intensity, even if it is in the same Holocene active fault. For example, the gas escape observed at Weihebu-Nanhechuan fault segment is more intense than that at Weihebu-Taohe fault segment in Northern margin active fault zone of western Qinling. The analytical results show that this difference is due to the influence of the underwater and landforms in the region.