为了监测一个主震空区破坏前的变形前兆,我们在阿拉斯加舒马金群岛设立了一个海平面监测网,点距40公里,测量精度1毫米。测阵的等效倾斜噪音级类似于这个群岛上每年复测的一组1—2公里长的水准线上的噪音级(1微弧度)。最近,我们又在舒马金群岛测量系 To monitor the precursors of deformation before the main shock zone was destroyed, we set up a sea-level monitoring network at the Shumaki Islands in Alaska at a point-to-point distance of 40 kilometers with a measurement accuracy of 1 millimeter. The equivalent tilt noise level of the array is similar to the noise level (1 microradians) on a set of 1-2 km long leveling lines rehearsed on an annual basis in this archipelago. Recently, we are again at the Shumakin Archipelago Department of Measurement