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沂沭断裂带是我国东部郯庐断裂带在山东境内的一组深大断裂。由东往西由昌邑——大店(F_1)、安丘——莒县(F_2)、沂水——汤头(F3)、鄌郚——葛沟(F_4)四条断裂组成,中间为汞丹山地垒,东边为莒县地堑,西边为苏村地堑(图1)。一九六九年渤海大震后在安丘、临沂设立了短水准观测站,一九七六年唐山大震后又在宿迁设立了台站,其中有短水准测量。经过十年来连续观测,取得了丰富可靠的资料。它不仅提供了地震前的形变异常,而且对于沂沭断裂带垂直运动提供了可靠数据。
The Yishu fault zone is a set of deep faults in the eastern part of Shandong Province, the Tan-Lu fault zone. From east to west, it consists of four faults, Changyi-Da-fang, Anqiu-Juxian (F_2), Yishui-Tangtou (F3) Danshan basement, east of Shexian graben, west of the Su Cang grab) (Figure 1). After the Bohai Sea earthquake in 1969, a short-range observation station was set up in Anqiu and Linyi, and a station was set up in Suqian after the Tangshan earthquake in 1976, of which short-term measurements were available. After 10 years of continuous observation, has made a wealth of reliable information. It not only provides pre-earthquake deformation anomalies, but also provides reliable data for the vertical movement of the Yishu fault zone.