Contemporary vertical crustal deformation in Cascadia

2006 ◽  
Vol 417 (3-4) ◽  
pp. 221-230 ◽  
Author(s):  
David Verdonck
Keyword(s):  
Crustal Deformation ◽  
Vertical Crustal Deformation

scholarly journals Estimation of present-day glacial isostatic adjustment, ice mass change and elastic vertical crustal deformation over the Antarctic ice sheet

2017 ◽  
Vol 63 (240) ◽  
pp. 703-715 ◽  
Author(s):  
BAOJUN ZHANG ◽  
ZEMIN WANG ◽  
FEI LI ◽  
JIACHUN AN ◽  
YUANDE YANG ◽  
...  
Keyword(s):  
Antarctic Peninsula ◽  
Crustal Deformation ◽  
Ice Sheet ◽  
East Antarctica ◽  
Mass Change ◽  
Glacial Isostatic Adjustment ◽  
Antarctic Ice Sheet ◽  
Isostatic Adjustment ◽  
The Antarctic ◽  
Vertical Crustal Deformation

ABSTRACTThis study explores an iterative method for simultaneously estimating the present-day glacial isostatic adjustment (GIA), ice mass change and elastic vertical crustal deformation of the Antarctic ice sheet (AIS) for the period October 2003–October 2009. The estimations are derived by combining mass measurements of the GRACE mission and surface height observations of the ICESat mission under the constraint of GPS vertical crustal deformation rates in the spatial domain. The influence of active subglacial lakes on GIA estimates are mitigated for the first time through additional processing of ICESat data. The inferred GIA shows that the strongest uplift is found in the Amundsen Sea Embayment (ASE) sector and subsidence mostly occurs in Adelie Terre and the East Antarctica inland. The total GIA-related mass change estimates for the entire AIS, West Antarctica Ice Sheet (WAIS), East Antarctica Ice Sheet (EAIS), and Antarctic Peninsula Ice Sheet (APIS) are 43 ± 38, 53 ± 24, −23 ± 29 and 13 ± 6 Gt a−1, respectively. The overall ice mass change of the AIS is −46 ± 43 Gt a−1 (WAIS: −104 ± 25, EAIS: 77 ± 35, APIS: −20 ± 6). The most significant ice mass loss and most significant elastic vertical crustal deformations are concentrated in the ASE and northern Antarctic Peninsula.

scholarly journals TO THE QUESTION OF CRUSTAL DEFORMATION FROM SEASONAL LOAD WEIGHT CHIRKEI RESERVOIR

2015 ◽  
Author(s):  
Ш.Г. Идармачев ◽  
В.И. Черкашин ◽  
М.А. Мусаев ◽  
И.Ш. Идармачев
Keyword(s):  
Water Level ◽  
Crustal Deformation ◽  
Seasonal Changes ◽  
Hydroelectric Power Station ◽  
Hydroelectric Power ◽  
Power Station ◽  
Hydroelectric Dam ◽  
The Right ◽  
Vertical Crustal Deformation ◽  
Load Weight

В статье сделан анализ данных непрерывных электрометрических наблюдений в скважине, расположенной в районе правого борта плотины Чиркейской ГЭС за период времени 20102013 гг., которые коррелируют с сезонным изменением уровня воды в водохранилище. Один из механизмов связи между изменениями уровня воды в водохранилище и кажущимся сопротивлением пород может быть деформационный, т.е., сезонное изменение нагрузки, создаваемое весом водохранилища приводит к упругой деформации земной коры. Численные оценки показывают, что значение вертикальной относительной деформации земной коры в районе плотины ГЭС может достигать величин 1,2105 The article presents an analysis of data continuous electrometric observations in the borehole located in the right side of the dam of the Chirkei hydroelectric power station for the period 20102013, which correlate with seasonal changes in water level in the reservoir. One of the mechanisms of the link between changes in water level in the reservoir and the apparent resistance of rocks can be deformation, i.e., the seasonal change of the load created by the weight of the reservoir leads to elastic deformation of the earths crust. Numerical estimates show that the value of relative vertical crustal deformation in the area of the hydroelectric dam may reach values of 1,2105.

scholarly journals Drift Characteristics of DONET Pressure Sensors Determined From In-Situ and Experimental Measurements

2021 ◽  
Vol 8 ◽  
Author(s):  
Hiroyuki Matsumoto ◽  
Eiichiro Araki
Keyword(s):  
Crustal Deformation ◽  
Deep Sea ◽  
Pressure Sensors ◽  
Hydraulic Pressure ◽  
Megathrust Earthquakes ◽  
Initial Stage ◽  
Sensor Drift ◽  
Pressure Standard ◽  
Vertical Crustal Deformation

DONET, the dense ocean-floor network system for earthquakes and tsunamis, began operations in the Nankai Trough, SW Japan, in 2010. The present study focuses on pressure sensors that are being used as tsunami meters to measure changes in hydraulic pressure. Pressure sensors typically show a drift in their readings over their operational lifespan. DONET pressure sensors can act as geodetic sensors measuring vertical crustal deformation change over time if the sensor drift can be accurately corrected. Monitoring crustal deformation before the occurrence of megathrust earthquakes is performed by discriminating between the vertical crustal deformation and the sensor drift of the pressure sensors. Therefore, in this study, we evaluated the sensor drift shown by the DONET pressure sensors since their deployment into the deep-sea, by removing the tidal component and confirming the occurrence of sensor drift. We evaluated the initial behavior of pressure sensors before deep-sea deployment using our own high-accuracy pressure standard. Our experiment involved 20-MPa pressurization for the pressure sensors under an ambient temperature of 2°C for a duration of 1 month. Some sensor drifts in our experiment correspond in rate and direction to those from the in-situ measurements determined to be in the initial stage. Our experiment suggests that the pre-deployment pressurization of pressure sensors can be an effective procedure to determine the sensor drift after sensor deployment into the deep-sea.

scholarly journals GPS Imaging of Vertical Bedrock Displacements: Quantification of Two‐Dimensional Vertical Crustal Deformation in China

2021 ◽  
Vol 126 (4) ◽  
Author(s):  
Yuanjin Pan ◽  
William C. Hammond ◽  
Hao Ding ◽  
Rishav Mallick ◽  
Weiping Jiang ◽  
...  
Keyword(s):  
Crustal Deformation ◽  
Two Dimensional ◽  
Vertical Crustal Deformation
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