美国华盛顿卡内基研究所地磁研究室(DTM,Department of Terrestrial Magnet-ism,Carnegie Institution of Washington)所属地震小组的工作人员多年来致力于钻孔应变仪的研制工作。该仪器安装在地表下的基岩钻孔中,用于检测及记录地形变长期的微小变化。目前,应变资料正成为进一步认识地震的极有益的手段。本世纪60年代,DTM 的萨克斯(SelwynSacks)和在奥斯汀的得克萨斯州立大学的埃弗 The staff of the earthquake group affiliated with the Department of Terrestrial Magnet-ism (DTM) Department of Geology, The Carnegie Institution of Washington in the United States have for many years devoted themselves to the development of borehole strain gauges. The instrument installed in the bedrock under the surface of the earth, used to detect and record long-term micro-deformation of the deformation. At present, contingency information is becoming a very useful tool for further understanding of earthquakes. In the 1960s, DTM’s Selwyn Sacks and Everglades at Texas State University in Austin