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61.
通过对多年观测资料的分析 ,认为山西大同中心地震台水准测量数据准确地反映了地壳的垂直形变 ,并说明断层活动是造成数据变化的主要原因。得出了测线跨越的断层垂直位移为2 .5 mm/ a,测量场地地面总体向东南方向倾斜的结论。认为测量数据较好地反映了台站周围的地震活动。 相似文献
62.
Relative sea level change can be derived from tide records. In order to study the general sea level change along the coast of China, it is necessary to make a unified reduction for all the results obtained from various tide stations. A so-called isostatic datum of vertical movement of thecoastal land hasbeen suggested as a basis of the unified reduction in this paper, established by useof precise releveling data completed between 50's and 80's.The vertical movement velocities relative 相似文献
63.
Daniel Dzurisin 《Bulletin of Volcanology》1999,61(1-2):83-91
Personnel from the U.S. Geological Survey's Cascades Volcano Observatory conducted first-order, class-II leveling surveys
near Lassen Peak, California, in 1991 and at Newberry Volcano, Oregon, in 1985, 1986, and 1994. Near Lassen Peak no significant
vertical displacements had occurred along either of two traverses, 33 and 44 km long, since second-order surveys in 1932 and
1934. At Newberry, however, the 1994 survey suggests that the volcano's summit area had risen as much as 97±22 mm with respect
to a third-order survey in 1931. The 1931 and 1994 surveys measured a 37-km-long, east–west traverse across the entire volcano.
The 1985 and 1986 surveys, on the other hand, measured only a 9-km-long traverse across the summit caldera with only one benchmark
in common with the 1931 survey. Comparison of the 1985, 1986, and 1994 surveys revealed no significant differential displacements
inside the caldera. A possible mechanism for uplift during 1931–1994 is injection of approximately 0.06 km3 of magma at a depth of approximately 10 km beneath the volcano's summit. The average magma supply rate of approximately 1×10–3 km3/year would be generally consistent with the volcano's growth rate averaged over its 600,000-year history (0.7–1.7×10–3 km3/year).
Received: 10 September 1998 / Accepted: 4 December 1998 相似文献
64.
65.
Active horizontal and vertical deformation in western Washington is modeled using an inverse dislocation model. The modeling technique uses published horizontal crustal velocities, derived from campaign and continuous GPS data, and uplift rates, calculated from repeated historical leveling surveys. The plate interface is represented by both screw and edge dislocations divided into segments. The rate of slip deficit accumulation on each segment is estimated by inverting the surface deformation data using a linear least squares procedure. The model predicts the data well, with an overall RMS residual of 0.85 mm/year. The horizontal residual vectors show no discernable pattern and no significant uniform regional strain and rigid rotations can be identified. The estimated slip deficit accumulation rates suggest that the plate interface is locked in a broad region beneath the coastline and possibly partially locked further downdip. The maximum slip deficit rate was estimated at 32.1±1.9 mm/year or approximately 91% of the plate convergence rate. The partially locked zone appears to be accumulating slip deficit at 8.2±1.9 mm/year. 相似文献