【摘要】 介绍了哈尔滨市延寿地震台竖直摆倾斜仪的工作状态,列举了该仪器记录到的多次同震应变阶。分析认为:这种阶跃变化反映了地震因释放应变能而改变了地壳的应变场;从阶变图象可以看出:中强远震的同震阶变幅度较小,中强近震同震阶变的相对幅度较大,同等震级震中距越小,阶变幅度也越大。证明了近震对观测点(台站)附近区域应力场改变大于远震。同时,展示了2005年7月25日黑龙江省林甸县M5.1级地震的短期异常及临震异常变化图象,发现短期异常和临震异常的形态非常类似,但同一方向(分量)仪器对两次异常的响应程度却截然不同,这可能与此次地震孕育过程不同阶段的地壳应力调整和应力场变化密切相关。更多还原

【Abstract】 The working status of vertical pendulum tiltmeter in Yanshou Seismostation of Harbin is introduced,and several earthquake strain steps recorded by the instrument are presented.The results show that this kind of steps reflects the variation of crustal strain field caused by earthquakes.From the image of steps we can see that the magnitude of step is relatively small for medium and strong remote earthquake,and is large for near earthquakes.The epicentral distance smaller,the magnitude larger for the same magnitude earthquakes.It indicates the influence of near earthquake to local strain field is larger than remote earthquake.Through analysis to short term and imminent anomalies before Lindian M5.1 earthquake that occurred on Jul.25,2005,we found that shape of short term anomaly was very similar to the imminent one,but the response of one component observation to the two anomalies was different,which may be relevant to the adjustment of crustal strain field in different stage of earthquake development.更多还原