目前,在我国大量的地震台上设有DD—1型短周期地震仪。多年来已取得不少可贵的地震资料。这种仪器与电流计光记录相比,最大的优点是直观可见,便于迅速地发现和处理所记到地震。这对地震速报,震情监视来说是十分有利的。但由于DD—1仪器记录笔在记录时笔尖与记录纸面存在着摩擦,虽说记录笔固有频率较高,可是由于记录笔线圈转动惯量较小,记录笔杆较长,因而克服摩擦力矩能力较差,不可避免地对小振幅记录造成失真。这个 At present, DD-1 short-period seismograph is installed on a large number of seismic stations in our country. Over the years has made a lot of valuable seismic data. The biggest advantage of this type of instrument compared to galvanometer light recording is its intuitiveness for quick detection and handling of recorded earthquakes. This earthquake report, the earthquake monitoring is very favorable. However, due to the friction between the pen tip and the recording paper during recording, although the pen inherent frequency is high, the ability to overcome the friction moment is poor due to the smaller moment of inertia of the stylus pen and the longer writing pen. , Inevitably distorting small amplitude recordings. This one