中文摘要：

为探明汶川大地震中汉源县城高烈度异常的原因,对汉源县城震害进行了科学考察。依据震害情况,首先考察了汉源县城的建筑结构破坏,在此基础上圈定了严重破坏范围,然后考察了几处液化现象,最后对背后山滑坡进行了考察,并作了简要分析。根据汉源县城震害科学考察的结果,对汉源县城5个场点进行了对比性的地脉动测试。测试结果表明,震害严重的汉源二中、老财政局和汽车站3个场地的自振频率较小,而震害较轻的流沙河左岸和萝卜岗2个场地的自振频率较大。初步揭示了汉源县城高烈度异常的可能原因是砂土液化、滑坡和场地软弱。

英文摘要：

In order to explain the reason why abnormal intensity occurred in Hanyuan county town during Wenchuan earthquake,scientific investigation was carried out aiming at the earthquake damage to Hanyuan.According to the general damage case,firstly,the collapse of the buildings of the town were investigated,and a damage range based on the investigation was delineated.Secondly,some places with liquefaction phenomena were investigated.Finally,the Beihou Mountion landslide was investigated,too.All the earthquake damage was analyzed briefly.According to the investigation result,the microtremor character on some sites was tested comparatively.The test results show that the natural frequencies are small in the sites of Hanyuan No.2 school,old financial bureau and bus station,while the natural frequencies are bigger in the sites of the left bank of Liusha river and Luobugang.It is shown that the reasons resulting in the abnormal intensity may be soil liquefaction,landslide and soften sites.