Abstract
Observations of deformation processes were carried out in one of the regions of active fracturing in the territory of the Hanoi depression, with the purpose of determining the rates of recent crustal movements during time intervals of about 1 yr to several years. The measurements were conducted with deformometers and hydrostatic levellers installed in a 5 m deep trench. The observation data for the 1985–1988 period indicate a high tectonic activity in the region studied. The horizontal deformation rates are (1–10) 10 −5/yr, and the vertical rates are 10 −4−10 −3/yr. Spectral characteristics of recorded processes have been obtained as well as meteorological effects.
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