Pattern of recent vertical crustal movements in Maritime Canada

1976 ◽  
Vol 13 (5) ◽  
pp. 661-667 ◽  
Author(s):  
Petr Vaníček
Keyword(s):  
New Brunswick ◽  
Sea Level ◽  
Bay Of Fundy ◽  
Vertical Movements ◽  
Crustal Movements ◽  
First Order ◽  
Level Data ◽  
Velocity Surface ◽  
Maritime Canada ◽  
Vertical Crustal Movements

A surface depicting linear vertical movements in Maritime Canada was computed from sea-level data recorded by 8 tide guages and 308 mostly disjoint, relevelled segments of the first-order Canadian levelling network. Owing to the sparsity of the available data and their distribution, the velocity surface must be regarded as indicative of the crude features only. The indications are that there is a west-northwest trending belt of faster subsidence across the eastern end of the Bay of Fundy, and that there may be an area of uplift in northeastern New Brunswick. Although the faster subsidence around the eastern Bay of Fundy seems to be well established now, more data are needed to prove or dispel the existence of the indicated uplift.

A Method for the Evaluation of Vertical Crustal Movement from Scattered Geodetic Relevellings

1974 ◽  
Vol 11 (5) ◽  
pp. 605-610 ◽  
Author(s):  
P. Vaníček ◽  
D. Christodulidis
Keyword(s):  
Chesapeake Bay ◽  
Statistical Significance ◽  
Geodetic Survey ◽  
National Geodetic Survey ◽  
Specific Level ◽  
Vertical Crustal Movement ◽  
Crustal Movements ◽  
Velocity Surface ◽  
Vertical Crustal Movements ◽  
The U.S

The existing techniques for the quantitative evaluation of vertical crustal movements from geodetic spirit levelling have one common feature. They can deal only with a complete network of systematically relevelled connected lines. This paper presents a method, based on the least-squares fitting of a velocity surface, capable of using scattered as well as connected relevelled segments. A facility to choose a specific level of statistical significance of the results is built in. The performance of the method is tested on data for the vicinity of Chesapeake Bay. The results compare well with those of the U.S. National Geodetic Survey.

Application of PPP Solution to Determine the Absolute Vertical Crustal Movements: Case Study for Northeastern Europe

2017 ◽  
Author(s):  
Kamil Kowalczyk ◽  
Janusz Bogusz
Keyword(s):  
Time Series ◽  
Vertical Movements ◽  
Crustal Movements ◽  
Northeastern Poland ◽  
The Absolute ◽  
Set Up ◽  
Changes Over Time ◽  
The Relationship ◽  
Vertical Crustal Movements

To estimate the relationship between vertical movements of the Earth’s crust, geoid temporal changes and Mean Sea Level (MSL) variations, a knowledge about the absolute (determined from satellite and space techniques) height changes over time is required. In this paper, we give an idea of determining the height changes with a use of Vertical Switching Edge Detection (VSED) algorithm. On the basis of the least squares estimation, the VSED method detects the discontinuities in time series and determines the values of jumps at the same time. We used the time series from PPP (Precise Point Positioning) solution obtained in NGL (Nevada Geodetic Laboratory) using satellite data gathered at more than 50 permanent stations located in Latvia, Lithuania and northeastern Poland. The minimum time span of data was set up to 3 years. Data were pre-analyzed by removing outliers and interpolating small gaps. The obtained results give an overview of a possibility of the proposed method to be used and the ongoing vertical movements on the area we considered.

Catastrophic tidal expansion in the Bay of Fundy, CanadaEarth Sciences Sector (ESS) Contribution 20090423.

2010 ◽  
Vol 47 (8) ◽  
pp. 1079-1091 ◽  
Author(s):  
John Shaw ◽  
Carl L. Amos ◽  
David A. Greenberg ◽  
Charles T. O’Reilly ◽  
D. Russell Parrott ◽  
...  
Keyword(s):  
Water Temperature ◽  
Sea Level ◽  
Empirical Data ◽  
Late Holocene ◽  
Environmental Changes ◽  
Aboriginal Peoples ◽  
Bay Of Fundy ◽  
Data Sets ◽  
Level Data ◽  
Tidal Amplification

Tidal models for the Bay of Fundy, Canada — site of the highest recorded modern tide — show that tidal amplification began in the early Holocene and by ca. 5000 BP the range was almost 80% of the present range. Empirical data consisting of 146 sea-level index points and other observations appear to contradict model results. Aggregated relative sea-level data for Chignecto Bay and Minas Basin show that rapid tidal expansion began ca. 3400 BP. However, if we separate these two geographically separate data sets, evidence for this rapid late-Holocene tidal expansion is confined to Minas Basin. We explain this singularity by positing a barrier at the mouth of Minas Basin, at the Minas Passage, that delayed tidal expansion. With the rapid breakdown of this barrier and near-instantaneous tidal expansion, water temperature dropped, tidal currents and turbidity increased, and the form of the inner estuary was changed from lagoonal–mesotidal to macrotidal. We argue that the catastrophic breakdown of the barrier is related in the aboriginal legend of Glooscap, showing that aboriginal peoples observed the rapid environmental changes and preserved an oral record for 3400 years.

Sign in / Sign up

Export Citation Format

Share Document