突出地表热辐射场中现今构造活动信息的均值梯度法  

MEAN GRAD METHOD (MGM) FOR DISTINGUISHING INFORMATION OF CURRENT TECTONIC ACTIVITY FROM THERMAL RADIATION FIELD OF LAND SURFACE

作　　者：陈顺云[1] 马瑾[1] 刘培洵[1] 刘力强[1] 陈国强[1] 

机构地区：[1]中国地震局地质研究所,地震动力学国家重点实验室,北京100029

出　　处：《地震地质》2005年第4期661-668,共8页Seismology and Geology

基　　金：国家自然科学基金重大研究计划(90202018);科技部社会公益研究专项资金(2004DIB3J129);中国地震局专项经费共同资助。

摘　　要：利用热辐射探索构造活动具有“强背景,弱信息”的特点。地表辐射的探测精度与构造活动引起的辐射增强同属一个量级,有效信息可能被淹没于反演误差之中。并且,获得足够的精度后如何突出构造活动信息也是难点。为了解决上述问题,文中提出一种新方法——均值梯度法。其基本特点是,首先利用长时间数据进行平均,以损失一定的时间信息为代价获取更高的数据精度。然后根据大气和构造活动对地表热辐射影响的不同,利用热辐射梯度突出正在活动之断裂带的空间展布。分析表明,该方法可为利用热辐射探测现今构造活动的时空变化提供一些信息,同时也可为地震危险区划提供帮助。Compared with the strong noise background, intensity of efficient signal is very small when using thermal radiation to obtain the current tectonic activity. Increasing range of thermal radiation resulting from fault activity accords with dimension of inversion precision of thermal radiation of land surface, and information of fault activity is submerged by inversion error of thermal radiation of land surface. Besides, it is difficult to discriminate the information of fault activity when the data precision is high. This paper develops a new method, i.e. the Mean Grad Method （MGM） , to solve the above-mentioned problems. First, we average the long-time data to gain a higher data precision at an expense of losing time information, then, distinguish the space distribution of the current tectonic activity from thermal radiation field of land surface by space grad of thermal radiation according to the difference between influence of atmosphere and tectonic activity on land surface. This method can offer some features on variation of current tectonic activity with time and space and is helpful for plotting out earthquake danger area.

关 键 词：热红外辐射 现今构造活动 均值梯度法 

分 类 号：P314[天文地球—固体地球物理学]